Patent Publication Number: US-2023136852-A1

Title: Signal processing circuit and electronic device comprising same

Description:
CROSS-REFERENCE TO RELATED APPLICATION(S) 
     This application is a National Phase Entry of PCT International Application No. PCMKR2020/002292, which was filed on Feb. 18, 2020, and claims priority under 35 U.S.C. § 119 to Korean Patent Application No. 10-2019-0019507, which was filed on Feb. 19, 2019, in the Korean intellectual Property Office, the entire contents of each of which is incorporated herein by reference. 
    
    
     BACKGROUND 
     1. Field 
     The disclosure relates generally to an electronic device, and more particularly, to a signal processing circuit of the electronic device and a method for transmitting or receiving a signal by using the signal processing circuit. 
     Description of Related Art 
     An electronic device typically includes a signal processing circuit for transmitting or receiving a signal by using a radiator. For example, a communication module that performs wireless communication by using an antenna is typically disposed in the electronic device. 
     There is a need for miniaturization of circuits included in an electronic device, to support multi-band or multi-mode services or to provide a thinner and more compact identifier (ID). 
     When at least part of a human body, such as a head or hand, accesses or contacts an electronic device such as a smartphone or tablet, a radiator may have reduced system efficiency which, in turn, reduces the performance of the electronic device. 
     A variable capacitor may be used to compensate for an efficiency loss that occurs in various environments. When the variable capacitor is used to compensate for the efficiency loss, there is a frequent need for a large capacitance. However, a capacitance range of the variable capacitor used in a circuit may be limited. When the low-band resonant frequency band is incapable of being obtained although the maximum value of the capacitance of the variable capacitor is used, performance tends to degrade, 
     As such, there is a need in the art for improved radiating performance of a radiator in an electronic device, 
     SUMMARY 
     Aspects of the disclosure are to address at least the above-mentioned problems and/or disadvantages and to provide at least the advantages described below. 
     Accordingly, an aspect of the disclosure is to provide an electronic device in which the radiating performance of a radiator is improved in various radiating environments, such as where a hand phantom is holding an electronic device or the user&#39;s head is close to the electronic device, by shifting a resonance frequency to a lower band through the amplification of a variable capacitor. Another aspect of the disclosure is to provide a circuit or electronic device including a tuner, in which a value greater than the maximum capacitance value of a variable capacitor provided by the tuner may be used. 
     In accordance with an aspect of the disclosure, an electronic device may include a wireless communication module that transmits or receives a signal, a feed line that delivers a signal between the wireless communication module and a first radiator, a tuner including a variable capacitor connected to a ground part, and a reactance element connected between the variable capacitor and the feed line, The tuner may include a first switch that allows the reactance element and the variable capacitor to be selectively connected in series with each other. 
     In accordance with an aspect of the disclosure, a signal processing circuit may include a feed line that delivers a signal between a wireless communication module and a first radiator, a variable capacitor and a reactance element that are connected between the feed line and a ground part and are connected in series with each other, and a first switch connected to opposite ends of the reactance element. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The above and other aspects, features, and advantages of certain embodiments of the disclosure will be more apparent from the following description taken in conjunction with the accompanying drawings ;  in which: 
         FIG.  1    illustrates a front surface of a mobile electronic device, according to an embodiment; 
         FIG.  2    illustrates a rear surface of an electronic device of  FIG.  1   ; 
         FIG.  3    is a perspective view of an electronic device of  FIG.  1   ; 
         FIG.  4    is a block diagram illustrating an electronic device in a network environment according to an embodiment; 
         FIG.  5    is a circuit diagram illustrating a main configuration of a signal processing circuit, according to an embodiment; 
         FIG.  6    illustrates a graph illustrating amplification of capacitance, according to an embodiment; 
         FIG.  7    is a graph illustrating capacitance amplified depending on a frequency in a signal processing circuit, according to an embodiment; 
         FIG.  8    is a graph illustrating an experimental result regarding a shift of a resonant frequency in a signal processing circuit, according to an embodiment; 
         FIG.  9    illustrates a graph of radiation efficiency and a graph of a reflection coefficient according to a state of a switch of a signal processing circuit, according to an embodiment; 
         FIG.  10    is a circuit diagram illustrating a main configuration of a signal processing circuit including a plurality of radiators, according to an embodiment; 
         FIG.  11    illustrates a graph for radiation efficiency of a signal processing circuit including a plurality of radiators and a graph for a reflection coefficient of the signal processing circuit, according to an embodiment; 
         FIG.  12    illustrates a partial configuration of an electronic device having a tuner, according to an embodiment; 
         FIG.  13    illustrates a partial configuration of an electronic device including a reactance element, according to an embodiment; 
         FIG.  14    illustrates a connection relationship between a tuner and other components of a signal processing circuit, according to an embodiment; 
         FIG.  15    illustrates a connection relationship between a tuner and other components of a signal processing circuit, according to an embodiment; 
         FIG.  16    illustrates a connection relationship between a tuner and other components of a signal processing circuit, according to an embodiment; and 
         FIG.  17    illustrates an example of a plurality of radiators provided in an electronic device, according to an embodiment. 
     
    
    
     DETAILED DESCRIPTION 
     Embodiments of the disclosure will be described with reference to the accompanying drawings. Accordingly, those of ordinary skill in the art will recognize that modifications, equivalents, and/or alternatives on the embodiments described herein can be variously made without departing from the scope and spirit of the disclosure. Description of known functions and/or configurations will be omitted for the sake of clarity and conciseness, 
     Referring to  FIGS.  1  and  2   , according to an embodiment, the electronic device  100  may include a housing  110  including a first surface  110 A. (or front surface), a second surface  110 B (or rear surface), and a side surface  110 C surrounding the space between the first surface  110 A and the second surface  110 B. The housing may be referred to as the structure forming some of the first surface  110 A, the second surface  110 B, and the side surface  110 C of  FIG.  1   . According to an embodiment, the first surface  110 A may include a front plate  102  (e.g., a glass plate or a polymer plate including various coating layers) having at least a portion substantially transparent. The second surface  10 B may include a rear plate  111  substantially opaque. The rear plate  111  may include, for example, coated or colored glass, ceramic, polymer, metal (e.g., aluminum, stainless steel (STS), or magnesium) or the combination of the above materials. The side surface  1100  may include a side bezel structure (or “side member”)  118  which is coupled to the front plate  102  and the rear plate  111 , and includes metal and/or polymer. According to an embodiment, the rear plate  111  and the side bezel structure  118  may be formed integrally with each other and may include the same material (e.g., a metal material such as aluminum). 
     According to an embodiment illustrated, the front plate  102  may include two first areas  110 D bent toward the rear plate  111  from the first surface  110 A while seamlessly extending and formed at opposite long edge ends of the front plate  102 . According to an embodiment illustrated in  FIG.  2   , the rear plate  111  may include two second areas  110 E bent from the second surface  110 B toward the front plate  102  while seamlessly extending and formed at opposite long edge ends of the rear plate  111 . According to an embodiment, the front plate  102  (or the rear plate  111 ) may include only one of the first areas  110 D (or the second areas  110 E), According to another embodiment, some of the first areas  110 D or the second areas  110 E may not be included. According to the embodiments, when viewed from the side surface of the electronic device  100 , the side bezel structure  118  may have a first thickness (or width) at the side surface having no first areas  110 D or second areas  110 E, and may have a second thickness thinner than the first thickness, at the side surface including the first areas  110 D or the second areas  110 E. 
     According to an embodiment, the electronic device  100  includes at least one a display  101 , audio modules  103 ,  107  and  114 , sensor modules  104 ,  116  and  119 , camera modules  105 ,  112  and  113 , a key input device  117 , a light emitting device  106 , or connector holes  108  and  109 . According to an embodiment, the electronic device  100  may omit at least one (e.g., the key input device  117  or the light emitting device  106 ) of components or may include other components. 
     The display  101  may be exposed, for example, through a substantial portion of the front plate  102 . According to an embodiment, at least a portion of the display  101  may be exposed through the front plate  102  including the first surface  110 A and first areas  110 D of the side surface  1100 . According to an embodiment, the edge of the display  101  may be formed substantially identically to the shape of an adjacent outer shape of the front plate  102 . Alternatively, to expand an area for exposing the display  101 , the distance between an outer portion of the display  101  and an outer portion of the front plate  102  may be substantially uniformly formed. 
     A recess or an opening is formed in a portion of a screen display area of the display  101 . In addition, at least one of the audio module  114 , the sensor module  104 , the camera module  105 , or the light emitting device  106  aligned in line with the recess or the opening may be included in the portion of the screen display area of the display  101 . The display  101  may be coupled or disposed adjacent to a touch sensing circuit, a pressure sensor to measure the intensity (pressure) of a touch, and/or a digitizer to detect the stylus pen based on an electromagnetic scheme. According to an embodiment, at least some of the sensor module  104  or  119  and/or at least a portion of the key input device  117  may be disposed in the first areas  110 D and/or the second areas  110 E. 
     The audio modules  103 ,  107 , and  114  may include a microphone hole  203  and speaker holes  107  and  114 . The microphone hole  103  may have a microphone disposed inside the microphone hole  103  to obtain an external sound. In an embodiment, a plurality of microphones may be provided to sense the direction of a sound. The speaker holes  107  and  114  may include an external speaker hole  107  and a receiver hole  114  for conversation. In an embodiment, the speaker holes  107  and  114  and the microphone hole  103  may be implemented into one hole or a speaker may be included without the speaker holes  107  and  114  (e.g., a piezoelectric speaker). 
     The sensor modules  104 ,  116 , and  119  may sense electrical signals or data values corresponding to an internal operating state or an external environment state of the electronic device  100 . The sensor modules  104 ,  116  and  119  may, for example, include a first sensor module  104  (e.g., a proximity sensor) and/or a second sensor module (e.g., a proximity sensor) disposed on the first side surface  110 A of the housing  110 , and/or a third sensor module  119  (e.g., a heart rate monitor (HRM) sensor) and/or a fourth sensor module  116  disposed on the second surface  110 B of the housing  110 . The fingerprint sensor may be disposed on the second surface  110 B as well as the first surface  110 A (e.g., the display  101 ) of the housing  210 . The electronic device  100  may further include a sensor module, for example, include at least one of a gesture sensor, a gyro sensor, an air pressure sensor, a magnetic sensor, an acceleration sensor, a grip sensor, a color sensor, an infrared sensor, a biometrics sensor, a temperature sensor, a humidity sensor, or an illuminance sensor  104 . 
     The camera modules  105 ,  112  and  113  may include a first camera device  105  disposed on the first side surface  110 A of the electronic device  100  and a second camera device  112  and/or a flash  113  disposed on the second side surface  110 B of the electronic device  100 . The camera devices  105  and  112  may include one or a plurality of lenses, an image sensor, and/or an image signal processor. The flash  113  may include, for example, a light emitting diode or a xenon lamp. According to an embodiment, two or more lenses (infrared camera, a wide angle lens, and a telephoto lens) and image sensors may be disposed on one surface of the electronic device  100 . 
     The key input device  117  may be disposed on the side surface  110 C of the housing  110 . According to another embodiment, the electronic device  100  may not include some or an entire portion of the key input device  117  and the some or the entire portion of the key input device  117  not included may be implemented in another form such as a soft key on the display  101 . According to another embodiment, the key input device  117  may include the sensor module  116  disposed on the second side surface  110 B of the housing  110 . 
     The light emitting device  106  may be, for example, disposed on the first surface  110 A of the housing  110 . The light emitting device  106  may provide, for example, the state information of the electronic device  100  in an optical form. According to another embodiment, the light emitting device  106  may provide, for example, a light source operating together with the operation of the cameral module  105 . The light emitting device  106  may include, for example, an LED, an IR LED, and a xenon lamp. 
     The connector holes  108  and  109  may include a first connector hole  108  to receive a connector (e.g., a USB connector) to transmit or receive power and/or data together with the external electronic device and a second connector hole (e.g., an ear-phone jack)  109  to receive a connector to transmit or receive an audio signal together with the external electronic device. 
     Referring to  FIG.  3   , an electronic device may include a side bezel structure  310 , a first support member  311  (e.g., a bracket), a front plate  320 , a display  330 , a printed circuit board  340 , a battery  350 , a second support member  360  (e.g., a rear case), an antenna  370 , and a rear plate  380 . According to an embodiment, the electronic device  300  may additionally include at least one (e.g., the first support member  311  or the second support member  360 ) of components At least one of components of the electronic device  300  may be identical to or similar to at least one of components of the electronic device  200  of  FIG.  2    or  FIG.  3   , and duplicated descriptions thereof will be omitted. 
     The first support member  311  is disposed in the electronic device  101  to be coupled to the side bezel structure  310  or to be integrated with the side bezel structure  310 . The first support member  311  may include, for example, a metal material and/or a non-metal material (e.g., polymer). The first support member  311  may have one surface coupled to the display  330  and an opposite surface coupled to the printed circuit board  340 . A processor, a memory, and/or an interface may be mounted on the printed circuit board  340 . The processor may include, for example, one or more of a central processing unit, an application processor, a graphic processing unit, an image signal processor, a sensor hub processor, or a communication processor. 
     The memory may include, for example, a volatile memory and/or a non-volatile memory. The interface may include, for example, a high definition multimedia interface (HDMI), a universal serial bus (USB) interface, a secure digital (SD) card interface, and/or an audio interface. The interface may, for example, electrically or physically connect the electronic device  300  with the external electronic device and may include a USB connector, an SD card/MMC connector, or an audio connector. 
     The battery  350  may include a device to supply power to at least one component of the electronic device  300 , for example, a non-rechargeable primary battery, or a rechargeable secondary battery, or a fuel cell. At least a portion of the battery  350  may be on the substantially same plane as a plane of the printed circuit board  340 . The battery  350  may be disposed inside the electronic device  300  integrally with the electronic device  300 , and may be disposed detachably from the electronic device  101 . 
     The antenna  370  may be interposed between the rear plate  380  and the battery  350 . The antenna  370  may include, for example, a near field communication (NFC) antenna, a wireless charging antenna, and/or a magnetic secure transmission (MST) antenna. The antenna  370  may make local area network communication with an external device or may wirelessly transmit or receive power necessary for charging. According to another embodiment, an antenna structure may be formed by a portion of the side bezel structure  310  and/or the first support member  311  or the combination of the side bezel structure  140  and the first support member  141 . 
       FIG.  4    is a block diagram illustrating an electronic device  401  in a network environment  400  according to an embodiment. Referring to  FIG.  4   , the electronic device  401  in the network environment  400  may communicate with an electronic device  402  via a first network  498  (e.g., a short-range wireless communication network), or an electronic device  404  or a server  408  via a second network  499  (e.g., a long-range wireless communication network). According to an embodiment, the electronic device  401  may communicate with the electronic device  404  via the server  408 . According to an embodiment, the electronic device  401  may include a processor  420 , memory  430 , an input device  450 , a sound output device  455 , a display device  460 , an audio module  470 , a sensor module  476 , an interface  477 , a haptic module  479 , a camera module  480 , a power management module  488 , a battery  489 , a communication module  490 , a subscriber identification module (SIM)  496 , or an antenna module  497 . In some embodiments, at least one (e.g., the display device  460  or the camera module  480 ) of the components may be omitted from the electronic device  401 , or one or more other components may be added in the electronic device  401 . In some embodiments, some of the components may be implemented as single integrated circuitry. For example, the sensor module  476  (e.g., a fingerprint sensor, an iris sensor, or an illuminance sensor) may be implemented as embedded in the display device  460  (e.g., a display). 
     The processor  420  may execute, for example, software (e.g., a program  440 ) to control at least one other component (e.g., a hardware or software component) of the electronic device  401  coupled with the processor  420 , and may perform various data processing or computation. According to one embodiment, as at least part of the data processing or computation, the processor  420  may load a command or data received from another component (e.g., the sensor module  476  or the communication module  490 ) in volatile memory  432 , process the command or the data stored in the volatile memory  432 , and store resulting data in non-volatile memory  434 . According to an embodiment, the processor  420  may include a main processor  421  (e.g., a central processing unit (CPU) or an application processor (AP)), and an auxiliary processor  423  (e.g., a graphics processing unit (GPU), an image signal processor (ISP), a sensor hub processor, or a communication processor (CP)) that is operable independently from, or in conjunction with, the main processor  421 . Additionally or alternatively, the auxiliary processor  423  may be adapted to consume less power than the main processor  421 , or to be specific to a specified function. The auxiliary processor  423  may be implemented as separate from, or as part of the main processor  421 . 
     The auxiliary processor  423  may control at least some of functions or states related to at least one component (e.g., the display device  460 , the sensor module  476 , or the communication module  490 ) among the components of the electronic device  401 , instead of the main processor  421  while the main processor  421  is in an inactive (e.g., sleep) state, or together with the main processor  421  while the main processor  421  is in an active state (e.g., executing an application), According to an embodiment, the auxiliary processor  423  (e.g., an image signal processor or a. communication processor) may be implemented as part of another component (e.g., the camera module  480  or the communication module  490 ) functionally related to the auxiliary processor  423 . 
     The memory  430  may store various data used by at least one component e.g., the processor  420  or the sensor module  476 ) of the electronic device  401 . The various data may include, for example, software (e.g., the program  440 ) and input data or output data for a command related thereto. The memory  430  may include the volatile memory  432  or the non-volatile memory  434 . 
     The program  440  may be stored in the memory  430  as software, and may include, for example, an operating system (OS)  442 , middleware  444 , or an application  446 . 
     The input device  450  may receive a command or data to be used by another component (e.g., the processor  420 ) of the electronic device  401 , from the outside (e.g., a user) of the electronic device  401 . The input device  450  may include, for example, a microphone, a mouse, a keyboard, or a digital pen (e.g., a stylus pen). 
     The sound output device  455  may output sound signals to the outside of the electronic device  401 . The sound output device  455  may include, for example, a speaker or a receiver. The speaker may be used for general purposes, such as playing multimedia or playing record, and the receiver may be used for an incoming calls. According to an embodiment, the receiver may be implemented as separate from, or as part of the speaker. 
     The display device  460  may visually provide information to the outside (e.g., a user) of the electronic device  401 . The display device  460  may include, for example, a display, a hologram device, or a projector and control circuitry to control a corresponding one of the display, hologram device, and projector. According to an embodiment, the display device  460  may include touch circuitry adapted to detect a touch, or sensor circuitry (e.g., a pressure sensor) adapted to measure the intensity of force incurred by the touch. 
     The audio module  470  may convert a sound into an electrical signal and vice versa. According to an embodiment, the audio module  470  may obtain the sound via the input device  450 , or output the sound via the sound output device  455  or a headphone of an external electronic device (e.g., an electronic device  402 ) directly (e.g., wiredly) or wirelessly coupled with the electronic device  401 . 
     The sensor module  476  may detect an operational state (e.g., power or temperature) of the electronic device  401  or an environmental state (e.g., a state of a user) external to the electronic device  401 , and then generate an electrical signal or data value corresponding to the detected state, According to an embodiment, the sensor module  476  may include, for example, a gesture sensor, a gyro sensor, an atmospheric pressure sensor, a magnetic sensor, an acceleration sensor, a grip sensor, a proximity sensor, a color sensor, an infrared (IR) sensor, a biometric sensor, a temperature sensor, a humidity sensor, or an illuminance sensor. 
     The interface  477  may support one or more specified protocols to be used for the electronic device  401  to be coupled with the external electronic device (e.g., the electronic device  402 ) directly (e.g., wiredly) or wirelessly. According to an embodiment, the interface  477  may include, for example, an HDMI, a USB interface, an SD card interface, or an audio interface. 
     A connecting terminal  478  may include a connector via which the electronic device  401  may be physically connected with the external electronic device (e.g., the electronic device  402 ). According to an embodiment, the connecting terminal  478  may include, for example, a HDMI connector, a USB connector, a SD card connector, or an audio connector (e.g., a headphone connector). 
     The haptic module  479  may convert an electrical signal into a mechanical stimulus (e.g., a vibration or a movement) or electrical stimulus which may be recognized by a user via his tactile sensation or kinesthetic sensation, According to an embodiment, the haptic module  479  may include, for example, a motor, a piezoelectric element, or an electric stimulator. 
     The camera module  480  may capture a still image or moving images. According to an embodiment, the camera module  480  may include one or more lenses, image sensors, image signal processors, or flashes. 
     The power management module  488  may manage power supplied to the electronic device  401 . According to one embodiment, the power management module  488  may be implemented as at least part of, for example, a power management integrated circuit (PMIC). 
     The battery  489  may supply power to at least one component of the electronic device  401 . According to an embodiment, the battery  489  may include, for example, a primary cell which is not rechargeable, a secondary cell which is rechargeable, or a fuel cell. 
     The communication module  490  may support establishing a direct (e.g., wired) communication channel or a wireless communication channel between the electronic device  401  and the external electronic device (e.g., the electronic device  402 , the electronic device  404 , or the server  408 ) and performing communication via the established communication channel. The communication module  490  may include one or more communication processors that are operable independently from the processor  420  (e.g., the AP) and supports a direct (e.g., wired) communication or a wireless communication. According to an embodiment, the communication module  490  may include a wireless communication module  492  (e.g., a cellular communication module, a short-range wireless communication module, or a global navigation satellite system (GNSS) communication module) or a wired communication module  494  (e.g.. a local area network (LAN) communication module or a power line communication (PLC) module). A corresponding one of these communication modules may communicate with the external electronic device via the first network  498  (e.g., a short-range communication network, such as Bluetooth™, wireless-fidelity (Wi-Fi) direct, or infrared data association (IrDA)) or the second network  499  (e.g., a long-range communication network, such as a cellular network, the Internet, or a computer network (e.g., LAN or wide area network (WAN)). These various types of communication modules may be implemented as a single component (e.g., a single chip), or may be implemented as multi components (e.g., multi chips) separate from each other. The wireless communication module  492  may identify and authenticate the electronic device  401  in a communication network, such as the first network  498  or the second network  499 , using subscriber information international mobile subscriber identity (IMSI)) stored in the SIM  496 . 
     The antenna module  497  may transmit or receive a signal or power to or from the outside (e.g., the external electronic device) of the electronic device  401 . According to an embodiment, the antenna module  497  may include an antenna including a radiating element composed of a conductive material or a conductive pattern formed in or on a substrate PCB). According to an embodiment, the antenna module  497  may include a plurality of antennas. In such a case, at least one antenna appropriate for a communication scheme used in the communication network, such as the first network  498  or the second network  499 , may be selected, for example, by the communication module  490  (e.g., the wireless communication module  492 ) from the plurality of antennas. The signal or the power may then be transmitted or received between the communication module  490  and the external electronic device via the selected at least one antenna. According to an embodiment, another component (e.g,, a radio frequency integrated circuit (RFIC)) other than the radiating element may be additionally formed as part of the antenna module  497 . 
     At least some of the above-described components may be coupled mutually and communicate signals (e.g., commands or data) therebetween via an inter-peripheral communication scheme (e,g., a bus, general purpose input and output (GPIO), serial peripheral interface (SPI), or mobile industry processor interface (MIPI). 
     According to an embodiment, commands or data may be transmitted or received between the electronic device  401  and the external electronic device  404  via the server  408  coupled with the second network  499 . Each of the electronic devices  402  and  404  may be a device of a same type as, or a different type, from the electronic device  401 . According to an embodiment, all or some of operations to be executed at the electronic device  401  may be executed at one or more of the external electronic devices  402 ,  404 , or  408 . For example, if the electronic device  401  should perform a function or a service automatically, or in response to a request from a user or another device, the electronic device  401 , instead of, or in addition to, executing the function or the service, may request the one or more external electronic devices to perform at least part of the function or the service. The one or more external electronic devices receiving the request may perform the at least part of the function or the service requested, or an additional function or an additional service related to the request, and transfer an outcome of the performing to the electronic device  401 . The electronic device  401  may provide the outcome, with or without further processing of the outcome, as at least part of a reply to the request. To that end, a cloud computing, distributed computing, or client-server computing technology may be used, for example. 
       FIG.  5    is a circuit diagram  500  illustrating a main configuration of a signal processing circuit, according to an embodiment. 
     A signal processing circuit may include a variable capacitor  501  and a reactance element  502  that are connected in series. Referring to  FIG.  5   , the variable capacitor  501  and the reactance element  502  may be connected between a ground part  505  and a feed line  504 , which transmits and receives a signal from a wireless communication module  510  to a radiator  520 . The signal delivered through the feed line may be an electrical signal or a radio frequency (RF) signal. 
       FIG.  5    illustrates that the variable capacitor  501  is connected to the ground part  505 . However, connection locations of the variable capacitor  501  and the reactance element  502  may be substituted with each other. 
     The signal processing circuit may further include a first switch  503  connected to opposite ends of the reactance element  502 . When the first switch  503  is closed, the opposite ends of the first switch  503  are connected substantially without resistance. In this specification, a state in which the opposite ends of the switch are connected substantially without resistance refers to as a state in which a switch is turned on. The opposite ends of the reactance element  502  connected in parallel with the first switch  503  are connected substantially without resistance when the first switch  503  is turned on. Accordingly, the reactance element  502  may not affect impedance Zin seen from the feed line  504 . 
     When the first switch  503  is opened, the opposite ends of the first switch  503  are disconnected from each other. In this specification, a state in which the switch is opened refers to as a state in which a switch is turned off. When the first switch  503  is turned off, the reactance element  502  may affect impedance Zin seen from the feed line  504 . For example, the signal processing circuit may operate in a mode that is different depending on an operation of the first switch  503 . 
       FIG.  6    is a graph  600  illustrating amplification of capacitance, according to an embodiment.  FIG.  6    illustrates impedance Zin according to frequency ω. 
     Referring to a curve  610  indicating that the first switch  503  of  FIG.  5    is turned on, impedance Zin consists of only a capacitance component, and thus impedance Zin converges to zero as frequency ω increases. Accordingly, impedance Zin may not be substantially zero. 
     On the other hand, referring to a curve  620  indicating that the first switch  503  of  FIG.  5    is turned off, impedance Zin becomes 0 at a resonance frequency 
     
       
         
           
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     In Equation (1), L denotes a reactance value of a reactance element, C var  denotes a capacitance value of a variable capacitor, and ω denotes a frequency. 
     Accordingly, when the signal processing circuit of  FIG.  5    operates while the first switch  503  of  FIG.  5    is turned off, an effect in which impedance Zin is amplified by a difference  630  between the curve  610  and the curve  620  may be obtained at frequency 
     
       
         
           
             
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       FIG.  7    is a graph  700  illustrating capacitance amplified depending on a frequency in a signal processing circuit, according to an embodiment. 
     For example,  FIG.  7    illustrates capacitance in picofarads (pF) in relation to frequency megahertz (MHz) and shows a capacitance value  710  when the first switch  503  of  FIG.  5    is turned on and a capacitance value  720  when the first switch  503  of  FIG.  5    is turned off, when a reactance element of a reactance value of 4.7 nH is used and the capacitance value of a variable capacitor is 4 pF. 
     Referring to  FIG.  7   , the reactance of the reactance element does not affect a circuit when the first switch  503  of  FIG.  5    is turned on, and thus the capacitance is maintained at 4 pF. On the other hand, when the first switch  503  of  FIG.  5    is turned off, the capacitance value  720  increases as a frequency increases. 
       FIG.  8    is a graph  800  illustrating an experimental result regarding a shift of a resonant frequency in a signal processing circuit, according to an embodiment. 
     Referring to  FIG.  8   , the graph  800  illustrates reflection coefficient in decibels (dB) in relation to frequency (MHz). As compared to curve  810  where the capacitance of a variable capacitor is 4 pF and a reactance element is not connected (“open”), it may be identified that a resonance frequency is shifted to a lower band in curve  820  where the reactance element is connected. Accordingly, a low-band antenna may be easily implemented by using a signal processing circuit. Furthermore, referring to a reflection coefficient in curve  830  where the capacitance is 3.04 pF and a reflection coefficient in curve  840  where the capacitance is 3.52 pF, it is identified that the resonant frequency is shifted to a high band as the capacitance decreases. 
       FIG.  9    illustrates a graph  901  of radiation efficiency and a graph  902  of a reflection coefficient according to a state of a switch of a signal processing circuit, according to an embodiment. 
     Graph  901  illustrates total radiation efficiency (dB) in relation to frequency MHz) and indicates that the radiation efficiency when the signal processing circuit operates while the first switch  503  of  FIG.  5    is turned off is higher in a partial region  910  than the radiation efficiency when a signal processing circuit operates while the first switch  503  of  FIG.  5    is turned on. 
     Graph  902  illustrates a reflection coefficient (dB) in relation to frequency (MHz). A shift  920  of the resonance frequency to a lower band occurs when the first switch  503  of  FIG.  5    is changed from an on state to an off state. 
       FIG.  10    is a circuit diagram  1000  illustrating a main configuration of a signal processing circuit including a plurality of radiators, according to an embodiment. 
     A signal processing circuit may include a variable capacitor  1001  and a reactance element (L)  1002 , which are connected in series with each other, or a switch  1003  connected to opposite ends of the reactance element (L)  1002 . The capacitor  1001  and the reactance element (L)  1002  may be connected between a feed line  1004 , which delivers a signal from a wireless communication module  1010  to a first radiator  1020 , and a ground part  1005 . A signal processing circuit may further include a second radiator  1022  that is another radiator for transmitting or receiving signals in different frequency bands. As compared with the circuit configuration of  FIG.  5   , the wireless communication module  1010  may process signals in different bands when the second radiator  1022  is further connected. 
       FIG.  11    illustrates a graph  1101  for radiation efficiency of a signal processing circuit including a plurality of radiators and a graph  1102  for a reflection coefficient of the signal processing circuit, according to an embodiment. 
     Graph  1101  illustrates total radiation efficiency (dB) in relation to frequency (MHz). Similar to graph  901  of  FIG.  9   , the radiation efficiency is improved in some bands when a signal processing circuit operates while a switch is turned off. 
     Graph  1102  illustrates a reflection coefficient (dB) in relation to frequency (MHz). In graph  1102 , it is identified that resonant frequencies in two bands are shifted to lower bands. 
       FIG.  12    illustrates a partial configuration  1240  of an electronic device having a tuner, according to an embodiment. When an electronic device includes a housing formed of a metal material, the electronic device may use the metal housing as a radiator. For example, the housing may include a first conductive portion  1221  or a second conductive portion  1222 , which are capable of being used as a radiator. 
     The electronic device may include a tuner (T)  1200  that selects a signal of a frequency while being tuned to the frequency of the signal. The tuner may be connected to at least one of the first conductive portion  1221  or the second conductive portion  1222  that is used as a radiator. As another example, the tuner may include a variable capacitor connected to at least one of the first conductive portion  1221  or the second conductive portion  1222 . 
     The electronic device may further include a wireless communication module  1210  for transmitting or receiving a signal with at least one of the first conductive portion  1221  or the second conductive portion  122 . 2  that is used as a radiator. The wireless communication module  1210  may be connected to at least one of the first conductive portion  1221  or the second conductive portion  1222  through a feed line  1205 . In  FIG.  12   , the feed line  1205  may be formed through the tuner  1200 . However, the wireless communication module  1210  may be connected to the first conductive portion  1221  or the second conductive portion  1222  through a feed line that does not pass through the tuner  1200 . 
     The electronic device may further include a conductive pattern  1230  connected to a ground part through the tuner  1200 . The conductive pattern  1230  may be provided to prevent radiation characteristics from deteriorating due to an electrical component  1208  (e.g., a USB connector, 3.5 pie connector, or c-type connector) of the electronic device adjacent to the first conductive portion  1221  or the second conductive portion  1222 . For example, the conductive pattern  1230  may include a dummy laser direct structuring (LDS) antenna. 
     Referring to  FIG.  12   , when a variable capacitor connected to a radiator (e.g., the first conductive portion  1221  or the second conductive portion  1222 ) is provided as a component included in the tuner  1200 , the maximum capacitance of the variable capacitor provided by the tuner  1200  may be fixed, and thus it may be difficult to obtain a capacitance value that exceeds a. predetermined value. 
     However,  FIG.  13    illustrates a partial configuration of an electronic device including a reactance element, according to an embodiment. 
     As shown in  FIG.  13   , the capacitance value of the variable capacitor provided by the tuner  1200  may be amplified by adding the reactance element  1300  to the outside of the tuner  1200 , 
     In  FIG.  13   , an electronic device may include a processor  1310  (e.g., the processor  420  of  FIG.  4   ). For example, the processor  1310  may include an AP or a CP of the electronic device. The processor  1310  may control a switch of a signal processing circuit  1301 . For example, the processor  1310  may be electrically connected to a switch of the signal processing circuit  1301  and may deliver an electrical control signal to the switch. 
     The processor  1310  may control the switch (e.g., the first switch  503  of  FIG.  5    or the first switch  1003  of  FIG.  10   ) such that the reactance element  1300  is connected in series with a. variable capacitor (e.g., the variable capacitor  501  in  FIG.  5    or the variable capacitor  1001  in  FIG.  10   ) when a specified event occurs. For example, the processor  1310  may control the switch such that the switch is opened when the specified event occurs. 
     The specified event may be when an object approaches or contacts an electronic device including a signal processing circuit. For example, the switch may be opened when a user grips the electronic device or when the user&#39;s head is located close to the electronic device. The processor  1310  may recognize that a specified event occurs, by using a sensor module. The processor  1310  may determine state information based on an electrical signal received from a sensor, and then may determine whether a specified event has occurred, depending on the state information, 
       FIG.  14    illustrates a connection relationship between the tuner  1200  and other components of a signal processing circuit  1400 , according to an embodiment. Referring to  FIG.  14   , the tuner  1200  may include a first variable capacitor C 1 , a second variable capacitor C 2 , a second switch S 1 , a third switch S 2 , a fourth switch S 3 , a first switch S 4 , and/or a dummy switch S 5 . However, the configuration of the tuner  1200  shown in  FIG.  14    is associated with an embodiment, and the configuration of the tuner may be changed depending on an embodiment. 
     The signal processing circuit  1400  or an electronic device including the signal processing circuit  1400  may include the wireless communication module  1210  connected to the tuner  1200 , a first radiator  1221 , a second radiator  1222 , and the conductive pattern  1230 . 
     The tuner  1200  may include a first node  1401 , a second node  1402 , a third node  1403 , and/or a fourth node  1404 . The tuner may include the dummy switch S 5  connected between the first node  1401  and a ground part  1450 , The first node  1401  may be connected to the conductive pattern  1230  outside the tuner  1200 . 
     The tuner  1200  may include the second switch S 1  connecting between the second node  1402  and the third node  1403 . The wireless communication module  1210  outside the tuner  1200  may be connected to the second node  1402 , and the first radiator  1221  may be connected to the third node  1403 , Accordingly, a feed path  1440  through which the wireless communication module  1210  is connected to the first radiator  1221  via the second switch S 1  may be formed. 
     The tuner  1200  may include the first switch S 4  connected between the fourth node  1404  and a fifth node  1405 . As another example, the tuner  1200  may include the second variable capacitor C 2  connected between a sixth node  1406  and the ground part  1450 , The reactance element  1300  may be connected between the first radiator  1221  and the sixth node  1406 . As another example, opposite ends of the reactance element  1300  may be further connected to the fourth node  1404  and the fifth node  1405 , respectively. The opposite ends of the reactance element  1300  are connected to each other when the first switch S 4  is turned on, and thus a circuit may operate without the influence of the reactance element  1300 , When the first switch S 4  is turned off, the reactance element  1300  and the second variable capacitor C 2  may be connected in series to each other between the teed path  1440  and the ground part  1450 . For example, the first switch S 4  may perform a function of the first switch  503  of  FIG.  5    or the first switch  1003  of  FIG.  10   . 
     The second radiator  1222  may be further connected to the tuner  1200 .  FIG.  15    illustrates a connection relationship between a tuner  1201  and other components of a signal processing circuit  1500 , according to an embodiment.  FIG.  15    is associated with when a feed line  1504  connected from the wireless communication module  1210  to a radiator  1220  is arranged in a direction in which one or more of seventh to tenth nodes  1407  to  1410  of the tuner  1201  are located. 
     The tuner  1201  may include a third variable capacitor C 3 , a fifth switch S 6 , a sixth switch S 7 , a seventh switch S 8 , and/or an eighth switch S 9 . However, the configuration of the tuner  1201  shown in  FIG.  15    may be changed depending on an embodiment. 
     Referring to  FIG.  15   , the seventh node  1407  may be connected to the feed line  1504  that delivers a signal from the wireless communication module  1210  to the radiator  1220 . As another example, the tuner  1201  may include the fifth switch S 6  connecting between the seventh node  1407  and the eighth node  1408 . 
     The eighth node  1408  and the ninth node  1409  of the tuner  1201  may be connected to the other side of the reactance element  1300 , of which one side is connected to the teed line  1504 . The tuner  1201  may further include the sixth switch S 7  connected between the ninth node  1409  and the third variable capacitor C 3  of the tuner  1201 . Each of the fifth switch S 6  and the sixth switch S 7  may perform the same function as the first switch  503  of  FIG.  5    or the first switch  1003  of  FIG.  10   . For example, when both the fifth switch S 6  and the sixth switch S 7  are turned on, the signal processing circuit  1500  may operate based on the capacitance of the third variable capacitor C 3  without the influence of the reactance element  1300 . As another example, when the fifth switch S 6  is turned off and the sixth switch S 7  is turned on, the capacitance of the third variable capacitor C 3  may be amplified by the reactance element  1300 . 
       FIG.  16    illustrates a connection relationship between the tuner  1201  and other components of a signal processing circuit  1600 , according to an embodiment. In particular,  FIG.  16    is associated with when a feed line  1604  connected from the wireless communication module  1210  to the first radiator  1221  is arranged in a direction in which one or more of eleventh to fourteenth nodes  1411  to  1414  of the tuner  1201  are located. 
     The tuner  1201  may include the third variable capacitor C 3 , the fifth switch S 6 , the sixth switch S 7 , the seventh switch S 8 , and the eighth switch S 9 . However, the configuration of the tuner  1201  shown in  FIG.  16    may be changed depending on an embodiment. 
     Referring to  FIG.  16   , the tuner  1201  may include the third variable capacitor C 3  connected to a tenth node  1410 . The tenth node  1410  may also be connected to a ground part  1605 . The eleventh node  1411  of the tuner  1201  may be connected to one side to which the tenth node  1410  of the third variable capacitor C 3  is not connected, and may be connected to the twelfth node  1412 . 
     One side of the reactance element  1300  may be connected to the eleventh node  1411  and the twelfth node  1412 . The other side of the reactance element  1300  may be connected to the feed line  1604  connected from the wireless communication module  1210  to the radiator  1221 . The tuner  1201  may include the seventh switch S 8  connecting the twelfth node  1412  and the thirteenth node  1413 . The seventh switch S 8  may perform a function of the first switch  503  of  FIG.  1   . 
     The second radiator  1222  may be further connected to the fourteenth node  1414  of the tuner  1201 . 
       FIG.  17    illustrates an example of a plurality of radiators provided in an electronic device  1700 , according to an embodiment. 
     The electronic device  1700  may include at least one of a first radiator  1721  formed using metal housing, a second radiator  1722  formed using metal housing, a separate third radiator  1723 , and a separate fourth radiator  1724 . 
     The first radiator  1721  may be used to transmit and receive signals in a low band (LB), a middle band (MB), and a high band. The second radiator  1722  may be used to transmit and receive signals in a middle band and a high band. 
     The electronic device  1700  may further include the third radiator  1723  used for a high-band signal and the fourth radiator  1724  used for a middle-band signal. 
     A signal processing circuit may be connected to at least one of radiators provided in the electronic device  1700 . 
     According to an embodiment, an electronic device may include a wireless communication module, a feed line, a tuner, a reactance element, and a first switch. The wireless communication module may transmit a signal to a radiator or may receive a signal from the radiator. The feed line may deliver a signal between the wireless communication module and the radiator. The tuner may include a variable capacitor connected to the ground part. A reactance element may be connected between the variable capacitor and the feed line. The first switch may operate such that the reactance element and the variable capacitor are selectively connected to each other in series. 
     The electronic device may further include another radiator connected to the feed line via the tuner. 
     The tuner may further include a conductive pattern connected to the ground part. The tuner may include a first switch, a dummy switch, and a second switch. The second switch may connect between a second node connected to the wireless communication module and. a third node connected to the radiator. The first switch may be connected between the fourth node and the fifth node of the tuner in the tuner. Outside the tuner, one side of the reactance element may be connected to a sixth node connected to the variable capacitor and the fifth node and the other side of the reactance element is connected to the fourth node and the radiator. 
     The tuner may include a seventh node, an eighth node, a ninth node, and a tenth node in one side of the tuner. The first switch may include a third switch connecting between the seventh node and the eighth node and a fourth switch connecting between the ninth node and the variable capacitor. 
     The tuner may include a tenth node in one side of the tuner, and may include an eleventh node, a twelfth node, and a thirteenth node in the other side of the tuner. The tuner may include a first switch that connects the twelfth node and the thirteenth node. The thirteenth node may be connected to the feed line. The tuner may include a first switch that connects the twelfth node and the thirteenth node. One side of the reactance element may be connected to the eleventh node and the twelfth node, and the other side of the reactance element may be connected to the feed line. 
     The electronic device may include a processor. The processor may control the first switch such that the first switch is opened when a specified event occurs. 
     The electronic device may include a sensor that senses an internal operating state of the electronic device or an external environmental state. The processor may recognize that the event occurs, based on information about the state sensed by using the sensor. The specified event may be when the electronic device approaches or contacts an object. 
     According to an embodiment, a signal processing circuit may include a feed line, a variable capacitor, a reactance element (, and a first switch. The feed line may deliver a signal between the wireless communication module and the radiator. The variable capacitor and the reactance element may be connected between the feed line and a ground part and may be connected in series with each other. 
     The variable capacitor and the first switch may be configured to be included in a tuner for selecting an operating frequency of the radiator. Furthermore, the reactance element may be located outside the tuner. 
     The electronic device may further include another radiator connected to the feed line via. the tuner. 
     The tuner may further include a conductive pattern connected to the ground part. 
     The tuner may include a first switch, a dummy switch, and a second switch. The second switch may connect between a second node connected to the wireless communication module and a third node connected to the radiator. The first switch may be connected between the fourth node and the fifth node of the tuner in the tuner. Outside the tuner, one side of the reactance element may be connected to a sixth node connected to the variable capacitor and the fifth node and the other side of the reactance element is connected to the fourth node and the radiator. 
     The tuner may include a seventh node, an eighth node, a ninth node, and a tenth node in one side of the tuner. The first switch may include a third switch connecting between the seventh node and the eighth node and a fourth switch connecting between the ninth node and the variable capacitor. 
     The tuner may include a tenth node in one side of the tuner, and may include an eleventh node, a twelfth node, and a thirteenth node in the other side of the tuner. The tuner may include a first switch that connects the twelfth node and the thirteenth node. The thirteenth node may be connected to the feed line, The tuner may include a first switch that connects the twelfth node and the thirteenth node. One side of the reactance element may be connected to the eleventh node and the twelfth node, and the other side of the reactance element may be connected to the feed line. 
     The first switch may be connected to a processor that controls the first switch. The processor may be configured to open the first switch when a specified event occurs. 
     The processor may control the first switch such that the first switch is opened when a specified event occurs. The processor may recognize that the event occurs, based on information about the state sensed by using the sensor. The specified event may be when the electronic device approaches or contacts an object. 
     The radiator may include at least part of metal housing of the electronic device including a signal processing circuit. 
     The electronic device according to various embodiments may be one of various types of electronic devices. The electronic devices may include, for example, a portable communication device (e.g., a smartphone), a computer device, a portable multimedia device, a portable medical device, a camera, a wearable device, or a home appliance. According to an embodiment of the disclosure, the electronic devices are not limited to those described above. 
     It should be appreciated that various embodiments of the present disclosure and the terms used therein are not intended to limit the technological features set forth herein to particular embodiments and include various changes, equivalents, or replacements for a corresponding embodiment. With regard to the description of the drawings, similar reference numerals may be used to refer to similar or related elements. It is to be understood that a singular form of a noun corresponding to an item may include one or more of the things, unless the relevant context clearly indicates otherwise. As used herein, each of such phrases as “A or B”, “at least one of A and B”, “at least one of A or B”, “A, B, or C”, “at least one of A, B, and C”, and “at least one of A, B, or C” may include any one of, or all possible combinations of the items enumerated together in a corresponding one of the phrases. As used herein, such terms as “1st” and “2nd”, or “first” and “second” may be used to simply distinguish a corresponding component from another, and does not limit the components in other aspect (e.g., importance or order). It is to be understood that if an element (e.g., a first element) is referred to, with or without the term “operatively” or “communicatively”, as “coupled with”, “coupled to”, “connected with”, or “connected to” another element (e.g., a second element), it means that the element may be coupled with the other element directly (e.g., wiredly), wirelessly, or via a third element. 
     As used herein, the term “module” may include a unit implemented in hardware, software, or firmware, and may interchangeably be used with other terms, for example, “logic”, “logic block”, “part”, or “circuitry”. A module may be a single integral component, or a minimum unit or part thereof, adapted to perform one or more functions. For example, according to an embodiment, the module may be implemented in a form of an application-specific integrated circuit (ASIC). 
     Various embodiments as set forth herein may be implemented as software (e.g., the program  440 ) including one or more instructions that are stored in a storage medium (e.g., internal memory  436  or external memory  438 ) that is readable by a machine (e.g., the electronic device  401 ), For example, a processor(e.g., the processor  420 ) of the machine (e.g., the electronic device  401 ) may invoke at least one of the one or more instructions stored in the storage medium, and execute it, with or without using one or more other components under the control of the processor, This allows the machine to be operated to perform at least one function according to the at least one instruction invoked, The one or more instructions may include a code generated by a compiler or a code executable by an interpreter. The machine-readable storage medium may be provided in the form of a non-transitory storage medium. Wherein, the term “non-transitory” simply means that the storage medium is a tangible device, and does not include a signal (e.g., an electromagnetic wave), but this term does not differentiate between where data is semi-permanently stored in the storage medium and where the data is temporarily stored in the storage medium. 
     A method according to various embodiments of the disclosure may be included and provided in a computer program product. The computer program product may be traded as a product between a seller and a buyer. The computer program product may be distributed in the form of a machine-readable storage medium e.g., compact disc read only memory (CD-ROM)), or be distributed (e.g., downloaded or uploaded) online via an application store (e.g., Playstore™), or between two user devices (e.g., smart phones) directly. If distributed online, at least part of the computer program product may be temporarily generated or at least temporarily stored in the machine-readable storage medium, such as memory of the manufacturer&#39;s server, a server of the application store, or a relay server. 
     According to various embodiments, each component (e.g., a module or a program) of the above-described components may include a single entity or multiple entities. According to various embodiments, one or more of the above-described components may be omitted, or one or more other components may be added. Alternatively or additionally, a plurality of components (e.g., modules or programs) may be integrated into a single component. In such a case, according to various embodiments, the integrated component may still perform one or more functions of each of the plurality of components in the same or similar manner as they are performed by a corresponding one of the plurality of components before the integration. According to various embodiments, operations performed by the module, the program, or another component may be carried out sequentially, in parallel, repeatedly, or heuristically, or one or more of the operations may be executed in a different order or omitted, or one or more other operations may be added. 
     While the disclosure has been shown and described with reference to various embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the disclosure as defined by the appended claims and their equivalents.