Abstract:
An antenna device of an electronic apparatus, according to embodiments of the present invention, includes radiation patterns comprising: at least one open boundary; and a plurality of radiation sections having the open boundary placed and arranged therebetween, wherein the radiation pattern forms a resonant frequency in a first frequency band (hereinafter, referred to as “a first resonance frequency”) and at least one among the radiation sections can form a resonant frequency in a second frequency band (hereinafter, referred to as “a second resonant frequency band”) higher than the first resonant frequency. The antenna device of the electronic apparatus, according to the present invention, can be implemented through other various embodiments.

Description:
TECHNICAL FIELD 
       [0001]    Various embodiments of the present disclosure relate to an antenna device. 
       BACKGROUND ART 
       [0002]    The development of wireless communication technologies enables data transmission/reception and data sharing between different electronic devices. For example, it is possible to directly transmit a multimedia file, which includes an image file stored in, for example, a digital camera or a multimedia reproducer, to a smart phone or a notebook computer. A data transmission technology between electronic devices may also be usefully used in a medical field. For example, information about a patient, which is obtained from a medical electronic device (e.g., an ElectroCardioGraphy (ECG) sensor to be attached to a human body) may be transmitted to, for example, a Personal Computer (PC) or a mobile communication terminal. Such inter-device information transmission may be performed through a communication method (e.g., wireless LAN, Bluetooth, or Near Field Communication (NFC)). 
         [0003]    Meanwhile, power transmission/reception, as well as ordinary communication, has also recently been implemented in a wireless manner, rather than a wired manner. In order to transmit/receive power in a wireless manner, a device that receives power (e.g., an electronic device such as a mobile communication terminal) is provided with a secondary coil or a resonance circuit. The secondary coil or the resonance circuit equipped in an electronic device receives power from a primary coil or a resonance circuit equipped in a power transmission device (e.g., a wireless charger), in an electromagnetic induction manner or a resonance manner. 
       DETAILED DESCRIPTION OF THE INVENTION 
     Technical Problem 
       [0004]    An electronic device, such as a notebook computer or a PC, may provide a space that is sufficient for mounting various types of antenna devices. However, it is difficult to secure a space for mounting an antenna device to some devices due to the size thereof. For example, a miniaturized and lightened electronic device (e.g., a mobile communication terminal) practically has a space that is narrow to mount an antenna device therein. In addition, in the actual situation where antenna devices of different communication standards (e.g., a mobile communication network connection antenna, a wireless LAN antenna, a Bluetooth antenna, and an NFC antenna) are mounted to an electronic device, there is a difficulty in securing a space for mounting an antenna device for wireless power transmission/reception. 
         [0005]    Accordingly, the present disclosure is intended to provide an antenna device for an electronic device, which may be easily installed even within a narrow space through various embodiments. 
         [0006]    In addition, the present disclosure is intended to provide an antenna device for an electronic device, which may be operably merged to different communication methods through various embodiments. 
       Technical Solution 
       [0007]    An antenna device of an electronic device, according to embodiments of the present invention, may include a radiation pattern that includes at least one open boundary and a plurality of radiation units that are arranged with the open boundary being interposed therebetween. 
         [0008]    The radiation pattern may form a resonance frequency in a first frequency band (hereinafter, referred to as a “first resonance frequency”), and at least one of the radiation units may form a resonance frequency in a second frequency band (hereinafter, referred to as a “second resonance frequency”) that is higher than the first frequency band. 
         [0009]    The open boundary may form a short circuit for a signal current in the first frequency band, and may form an open circuit for a signal current in the second frequency band. 
         [0010]    The length of the open boundary may be formed to be smaller than ¼ of a signal wavelength of the second resonance frequency. 
         [0011]    In a certain embodiment, the antenna device may further include an active element that is arranged in the open boundary so as to electrically short-circuit or open the radiation units, which are arranged to be adjacent to each other with the open boundary being interposed therebetween. 
         [0012]    The active element may include a PIN diode, a MicroElectroMechanical System (MEMS) switch, a bandpass filter, a low pass filter, or a Single Pole Single Throw (SPST) switch. 
         [0013]    In a certain embodiment, the first frequency band may be a frequency band in the range of 5 MHz to 15 MHz. 
         [0014]    In another embodiment, the second frequency band may be a frequency band in the range of 700 MHz to 65 GHz. 
         [0015]    In configuring the radiation pattern, a plurality of open boundaries and the radiation units may be alternately arranged to form a spiral shape. 
         [0016]    In a certain embodiment, in configuring the radiation pattern, the open boundary may be arranged to surround a first radiation unit among the radiation units, and a second radiation unit among the radiation units may arranged to surround the open boundary. 
         [0017]    In still another embodiment, some of the radiation units may be combined with each other to form a resonance frequency in a third frequency band that is higher than the first frequency band, and is different from the second frequency band. 
         [0018]    In a certain embodiment, the radiation pattern may be any one of a Archimedean spiral pattern, a log periodic spiral pattern, and a cavity-backed log periodic spiral pattern, in which a plurality of lines are arranged in a spiral shape that converges on a center. 
         [0019]    In another embodiment, the radiation pattern may include, among the radiation units, a first radiation unit that is surrounded by the open boundary, and a second radiation unit that is arranged to surround the open boundary. 
         [0020]    In the case of surrounding the open boundary, the second radiation may have a closed loop shape. 
         [0021]    In the antenna device as described above, the first radiation unit may include a portion that protrudes in a direction approaching the second radiation unit. 
       Advantageous Effects 
       [0022]    An antenna device, according to the embodiments of the present disclosure, apparently forms a single antenna device by forming an open boundary between a plurality of radiation units in forming a radiation pattern. However, the antenna device may form different resonance frequencies in different frequency bands. For example, the antenna device may form a resonance frequency in a  6  MHz band for wireless power transmission/reception, and may form another resonance frequency in a higher frequency band (e.g., a super-high frequency band of dozens of GHz or more). Accordingly, the antenna device can be easily installed even in an electronic device having a restricted installation space, such as a mobile communication terminal. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0023]      FIG. 1  is a diagram illustrating a radiation pattern of an antenna device according to embodiments of the present disclosure; 
           [0024]      FIG. 2  is a view illustrating an open boundary of the antenna device according to embodiments of the present disclosure in an enlarged scale; 
           [0025]      FIG. 3  is a diagram illustrating a radiation pattern of an antenna device according to the first one of embodiments of the present disclosure; 
           [0026]      FIG. 4  is a diagram illustrating a radiation pattern of an antenna device according to the second one of embodiments of the present disclosure; 
           [0027]      FIG. 5  is a view for describing a radiation characteristic of the antenna device according to the second one of various embodiments of the present disclosure; 
           [0028]      FIG. 6  is a diagram illustrating a radiation pattern of an antenna device according to the third one of embodiments of the present disclosure; 
           [0029]      FIG. 7  is a view for describing a radiation characteristic of the antenna device according to the third one of various embodiments of the present disclosure; 
           [0030]      FIG. 8  is a diagram illustrating a radiation pattern of an antenna device according to the fourth one of embodiments of the present disclosure; 
           [0031]      FIG. 9  is a view for describing a radiation characteristic of the antenna device according to the fourth one of various embodiments of the present disclosure; 
           [0032]      FIG. 10  is a diagram illustrating a radiation pattern of an antenna device according to the fifth one of embodiments of the present disclosure; 
           [0033]      FIG. 11  is a view for describing an operation of the antenna device according to the fifth one of various embodiments of the present disclosure; 
           [0034]      FIG. 12  is a diagram illustrating a radiation pattern of an antenna device according to the sixth one of embodiments of the present disclosure; 
           [0035]      FIG. 13  is a diagram illustrating an example of an electronic device that is equipped with an antenna device according to embodiments of the present disclosure; 
           [0036]      FIG. 14  is a diagram illustrating an application example of a medical probe that is equipped with an antenna device according to embodiments of the present disclosure; 
           [0037]      FIG. 15  is a diagram illustrating another example of an electronic device that is equipped with an antenna device according to embodiments of the present disclosure; and 
           [0038]      FIG. 16  is a diagram illustrating still another example of an electronic device that is equipped with an antenna device according to embodiments of the present disclosure. 
       
    
    
     MODE FOR CARRYING OUT THE INVENTION 
       [0039]    Hereinafter, various embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. In the description of the embodiments of the present disclosure, when it is determined that a detailed description of related well-known functions or structures causes confusion in the subject matter of the present disclosure, the description will be omitted. In addition, terms described later are defined in consideration of functions in the embodiment, but they may be replaced with other terms according to intention of a user or an operator, or a practice. Therefore, the terms will be defined more definitely through the description of the various embodiments of the present disclosure. Further, in the description of the embodiments of the present invention, a use of an ordinal number such as first and second is to distinguish objects having identical names from one another, and an order of the objects may be determined arbitrarily. 
         [0040]    According to embodiments of the present disclosure, an antenna device of an electronic device may be provided with a radiation pattern that includes a plurality of radiation units, the radiation pattern may form a resonance frequency in a first frequency band, and at least one of the radiation units may form a resonance frequency in a second frequency band that is higher than the first frequency band. For example, among the radiation units, a radiation unit, which forms the resonance frequency in the second frequency band, may operate as a portion of the radiator of the antenna device even when the resonance frequency is formed in the frequency band. The first frequency band may be set as a wireless power transmission/reception frequency band in the range of 5 MHz to 15 MHz (e.g., 6.78 MHz or 13.56 MHz), and the second frequency band may be set as a super-high frequency band in the range of 700 MHz to 800 MHz, 1.8 GHz, 2.1 GHz, or in the range of dozens of GHz to 65 GHz. 
         [0041]      FIG. 1  is a diagram illustrating a radiation pattern of an antenna device according to embodiments of the present disclosure. 
         [0042]    As illustrated in  FIG. 1 , an antenna device, according to embodiments of the present disclosure, may be provided with a radiation pattern  100  that includes a plurality of radiation units  111   a  and  111   b  with open boundaries  121   a  and  121   b  being interposed therebetween. Each of the radiation units  111   a  and  111   b  may extend in the form of a line or a strap, and the radiation units  111   a  and  111   b  may be arranged in the form of a spiral with the open boundaries  121   a  and  121   b  being interposed therebetween. While the specific embodiment of the present disclosure exemplifies that the arrangement of the radiation units  111   a  and  111   b  are formed in the form of a spiral, the present disclosure is not limited thereto. For example, the radiation units  111   a  and  111   b  may be arranged in the form of concentric circles or a plurality of loops. 
         [0043]    The radiation units may include a radiation unit  111   a  that is positioned at the center side of the spiral shape (hereinafter, referred to as a “first radiation unit”), and a radiation unit  111   b  that is positioned at the edge side of the spiral shape (hereinafter, referred to as a “second radiation unit”). The open boundaries  121   a  and  121   b  may be positioned between the first and second radiation units  111   a  and  111   b.  The first radiation unit  111   a,  the opening boundaries  121   a  and  121   b,  and the second radiation units  111   b  may be sequentially arranged to form a line or strap shape. In a certain embodiment, the radiation pattern  100  may include three or more radiation units, and the radiation units and the open boundaries may be alternately arranged. In alternately arranging the three or more radiation units and the open boundaries, it is evident that the radiation units and the open boundaries may be arranged in various forms of, for example, an opened loop, a closed loop, and a meander line, rather than being arranged to form one line or a spiral in the form of a strap. 
         [0044]    Depending on the frequency band of an applied signal current, the radiation pattern  100  may operate as a radiator in a state where the radiation unit  111   a,  the open boundaries  121   a  and  121   b,  and the second radiation unit  111   b  form an electric length, or may form a radiator in a state where only one of the first and second radiation units forms the electric length. The open boundaries  121   a  and  121   b  may selectively operate as a short circuit or an opening circuit on the radiation pattern  100 . Accordingly, the entire radiation pattern  100  may be used as a radiator to form a resonance frequency in the first frequency band (hereinafter, referred to as a “first resonance frequency”), and as only one of the first and second radiation units  111   a  and  111   b  forms the electric length, only a portion of the radiation pattern  100  may be used as a radiator to form a resonance frequency in the second frequency band (hereinafter, referred to as a “second resonance frequency”). Considering the configuration of the radiation pattern  100  as described above, a person ordinarily skilled in the art may easily understand that the second frequency band will be formed to be higher than the first frequency band. 
         [0045]    The electric length formed by the whole or a portion of the radiation pattern  100  may be controlled by using an impedance that is formed by the open boundaries  121   a  and  121   b  or an active element that is arranged in each of the open boundaries  121   a  and  121   b.  Such a configuration will be described in more detail with reference to  FIG. 2 . 
         [0046]      FIG. 2  is a view illustrating an open boundary of the antenna device according to embodiments of the present disclosure in an enlarged scale. 
         [0047]    The open boundary  121   a  may be formed merely by removing a portion of the radiation pattern  100  between the first and second radiation units  111   a  and  111   b , and according to an embodiment, an active element  123  may be arranged in the open boundary  121   a  so as to short-circuit or open the first and second radiation units  111   a  and  111   b.    
         [0048]    First, a configuration in which the active element  123  is not arranged in the open boundary  121   a  will be described. 
         [0049]    On the radiation pattern  100 , the impedance to be formed in the open boundary  121   a  may be defined by Equation 1 and Equation 2 as follows. 
         [0000]      Z=jwL   Equation 1
 
         [0000]      w=2πf   Equation 2
 
         [0050]    Here, “Z” represents the impedance of the open boundary  121   a,  and “wL” represents an inductive reactance formed by the open boundary  121   a,  in which “L” means the inductance of the open boundary  121   a,  which may be determined based on the length L of the open boundary  121   a  (e.g., the distance between the first and second radiation units  111   a  and  111   b ). “f” means the frequency of a signal current that is applied to the radiation pattern  100 . 
         [0051]    After the radiation pattern  100  is fabricated and completed, the length L of the open boundary  121   a  is fixed. Thus, according to Equation 1 and Equation 2, it may be understood that the impedance formed by the open boundary  121   a  is determined based on the frequency of a signal current that is applied to the radiation pattern  100 . For example, the impedance formed by the open boundary  121   a  may be proportional to the frequency of the signal current that is applied to the radiation pattern  100 . 
         [0052]    As a frequency band that is used for power transmission/reception, the 6.78 MHz band and the 13.56 MHz band are designated as the international standards. In commercialized mobile communication networks, various frequency bands (e.g., the 700 to 800 MHz band, the 1.8 GHz band, and the 2.1 GHz band) are used, and it is expected that in the future, a commercial communication network will be configured in a super-high frequency band of dozens of GHz or more. Accordingly, the open boundary  121   a  may operate as a short circuit for a signal current in the above-mentioned wireless power transmission/reception frequency band, and may operate as an open circuit for a signal current in a commercialized mobile communication frequency band. For example, in a low frequency band, such as the wireless power transmission/reception band, the entire radiation pattern  100  including the open boundary  121   a  may provide an electric length so as to form a resonance frequency, and in a higher frequency band, only a portion of the radiation units  111   a  and  111   b  may provide an electric length so as to form the second resonance frequency. 
         [0053]    Meanwhile, depending on the frequency band in which the radiation pattern  100  operates, (e.g., depending on the use, such as wireless power transmission/reception or data communication), it may be necessary to adjust the length of the open boundary  121   a.  Hereinafter, as an example, descriptions will be made on a configuration in which the antenna device, according to the embodiments of the present disclosure, operates in the frequency band of 6.78 MHz for wireless power transmission/reception and in the frequency band of 2.1 GH for data communication. 
         [0054]    When the open boundary  121   a  has impedance in the range of 0.01Ω to 500Ω with respect to the frequency of a signal current, the open boundary  121   a  may operate as the short circuit. Accordingly, in order to operate as the short circuit in the frequency band of 6.78 MHz, the open boundary  121   a  may have a length of 0.1 mm to 44.247 mm. In addition, in the frequency band of 2.1 GHz, the open boundary  121   a  may operate as the open circuit in the same length condition. By designing the length of the open boundary  121   a  in the range of 0.1 to 44.247 mm in consideration of such a condition, the open boundary  121   a  may operate as the short circuit in the frequency band of 6.78 MHz, and may operate as the open circuit in the frequency band of 2.1 GHz. However, the length of the open boundary  121   a  may be properly designed in consideration of the actual size of a device, to which the antenna device, which uses the radiation pattern  100 , is applied. Therefore, the radiation pattern  100  may form the first resonance frequency when its entire physical length is used as a radiator, and may form the second resonance frequency in a band that is higher than the first resonance frequency when only a portion of the radiation units is used as a radiator. 
         [0055]    In setting the length of the open boundary  121   a  as described above, the length may be formed to be smaller than ¼ of the wavelength of the higher resonance frequency among the frequency bands to be transmitted/received through the radiation pattern  100 . 
         [0056]    In this way, the antenna device, according to embodiments of the present disclosure, enables wireless communication in a high frequency band by using a portion of the radiation pattern in the low frequency band. For example, in the case of an antenna device for wireless power transmission/reception, which is operated in a low frequency band, the antenna device may also be used as an antenna device for data communication, which is operated in a high frequency band while a portion of the radiation pattern for wireless power transmission/reception is still used for wireless power transmission/reception, through embodiments of the present disclosure. 
         [0057]    In another embodiment, as described above, an active element  123  may be arranged in the open boundary  121   a  so as to short-circuit or open the first and second radiation units  111   a  and  111   b . The active element  123  may include a PIN diode, a MEMS switch, a bandpass filter, a low pass filter, or an SPST switch. In the case where a PIN diode is used as the active element  123 , the flowing direction of the signal current of the second frequency band (f_d) which flows in the radiation pattern  100  will be set to be opposite to the flowing direction of the signal current of the first frequency band (f_w2), and the active element  123  may cut off a signal current that flows in any one direction (e.g., the signal current of the second frequency band (f_d)). In the case where a filter or switch type active element is used, in the open boundary  121   a,  a short circuit may be formed for the signal current in the first frequency band, and an open circuit may be formed in the second frequency band depending on the frequency characteristic or the switching operation of the active element  123 . Accordingly, when the filter type or switch type active element is arranged in the open boundary  121   a,  the flowing direction of the signal current of the second frequency band (f_d) that flows in the radiation pattern  100  may be set to be the same as the flowing direction of the signal current of the first frequency band (f_w). 
         [0058]      FIG. 3  is a diagram illustrating a radiation pattern of an antenna device according to the first one of embodiments of the present disclosure. 
         [0059]    The radiation pattern  100   a  of the antenna device illustrated in  FIG. 3  has a configuration in which partially opened loop-shaped radiation units  111  are in the form of concentric circles. An open boundary  121  is formed at a position that is spaced apart from the center of the radiation pattern  100   a,  and the radial width or the circumferential length of the open boundary  121  may be set in consideration of an impedance component of the open boundary  121 . The width or the length of the open boundary  121  may be set in consideration of the frequency band in which the radiation pattern  100   a  operates, and in consideration of the impedance value obtained by the open boundary  121  according to a frequency band, as described above in the preceding embodiment. According to an embodiment, an active element may be arranged in the open boundary  121 . The open boundary  121  may operate as a short circuit or an open circuit between a first radiation unit  111   a  that is positioned at the center side of the radiation pattern  100   a  and a second radiation pattern  111   b  that is positioned at the edge side of the radiation pattern  100   a.  For example, when the open boundary  121  operates as a short circuit for a signal current in the first frequency band, the open boundary may operate as an open circuit for a signal current of the second frequency band that is higher than the first frequency band. 
         [0060]      FIG. 4  is a diagram illustrating a radiation pattern of an antenna device according to the second one of embodiments of the present disclosure.  FIG. 5  is a view for describing a radiation characteristic of the antenna device according to the second one of various embodiments of the present disclosure. 
         [0061]    The radiation pattern  100   b  of the antenna device illustrated in  FIG. 4  is exemplified as having a configuration that is formed in an Archimedean spiral shape. The illustrated radiation pattern is in the form where multiple lines (e.g., four (4) lines) converge on one center, and an open boundary may be formed in each of the four lines. In the wireless power transmission/reception frequency band (e.g., the 6.78 MHz band), the open boundaries  121  may operate as short circuits so that the entire radiation pattern  100   b  may form a resonance frequency. In a data communication frequency band (e.g., a frequency band of 700 MHz, 1.8 GHZ, or 2.1 GHz or more), the open boundaries  121  may form open circuits. One of a first radiation unit  111   a,  which is positioned closer to the center side than the open boundaries  121  and a second radiation unit  111   b,  which is positioned closer to the edge side than the open boundaries  121 , may form a resonance frequency. 
         [0062]      FIG. 5  represents a radiation power that is measured when the open boundary  121  forms an open circuit, and only one of the first radiation unit  111   a  and the second radiation unit  111   b  forms a resonance frequency (e.g., when the radiation pattern is used for data communication). As illustrated in  FIG. 5 , when only one of the first radiation unit  111   a  and the second radiation unit  111   b  forms a resonance frequency in a configuration where the radiation pattern  100   b  of antenna device is formed in the Archimedean spiral shape according to embodiments of the present disclosure, it can be seen that the radiation pattern  100   b  may exhibit an omnidirectional or non-oriented radiation characteristic. 
         [0063]      FIG. 6  is a diagram illustrating a radiation pattern of an antenna device according to the third one of embodiments of the present disclosure.  FIG. 7  is a view for describing a radiation characteristic of the antenna device according to the third one of various embodiments of the present disclosure. 
         [0064]      FIG. 6  exemplifies a log periodic pattern as a radiation pattern  100   c  of the illustrated antenna device. For example, the illustrated radiation pattern  100   c  takes a form in which two patterns, of which the width gradually varies, converge on a center substantially in a spiral shape, and the open boundary  121  may be formed in each of the two patterns. By impedance depending on the length or width of the open boundary  121  or the characteristic of an active element that is arranged in the open boundary  121 , the open boundary  121  may operate as a short circuit or an open circuit depending on the frequency of a signal current that is applied to the radiation pattern  100   c.    
         [0065]      FIG. 7  illustrates the radiation power of the radiation pattern  100   c  that is measured when the open boundary  121  forms an open circuit such that the first radiation unit  111   a,  which is positioned closer to the center side of the radiation pattern  100   c  than the open boundary  121 , or the second radiation pattern  111   b , which is positioned closer to the edge side than the open boundary  121 , forms a resonance frequency. As illustrated in  FIG. 7 , when one of the first radiation unit  111   a  and the second radiation unit  111   b  forms a resonance frequency in a configuration where the radiation pattern  100   c  of antenna device is formed in the log periodic pattern according to embodiments of the present disclosure, it can be seen that the radiation pattern  100   c  may exhibit a directional radiation characteristic. 
         [0066]      FIG. 8  is a diagram illustrating a radiation pattern of an antenna device according to the fourth one of embodiments of the present disclosure.  FIG. 9  is a view for describing a radiation characteristic of the antenna device according to the fourth one of various embodiments of the present disclosure. 
         [0067]      FIG. 8  exemplifies a cavity-backed log periodic pattern as a radiation pattern  100   d  of an illustrated antenna device. The radiation pattern  100   d  has a configuration in which a log periodic pattern is accommodated in a cavity  119 , and an open boundary  121  may be formed in each of two patterns. By impedance depending on the length or width of the open boundary  121  or the characteristic of an active element that is arranged in the open boundary  121 , the open boundary  121  may operate as a short circuit or an open circuit depending on the frequency of a signal current that is applied to the radiation pattern  100   d.    
         [0068]      FIG. 9  represents a radiation power of the radiation pattern  100   d  that is measured when the open boundary  121  forms an open circuit, and one of the first radiation unit  111   a  and the second radiation unit  111   b,  rather than the open boundary  121 , forms a resonance frequency. As illustrated in  FIG. 9 , when only one of the first radiation unit  111   a  and the second radiation unit  111   b  forms a resonance frequency in a configuration where the radiation pattern  100   d  of an antenna device is formed in a cavity-backed periodic pattern according to embodiments of the present disclosure, it can be seen that the radiation pattern  100   d  may exhibit a unidirectional radiation characteristic. 
         [0069]      FIG. 10  is a diagram illustrating a radiation pattern of an antenna device according to the fifth one of embodiments of the present disclosure.  FIG. 11  is a view for describing an operation of the antenna device according to the fifth one of various embodiments of the present disclosure. 
         [0070]    Referring to  FIGS. 10 and 11 , the radiation pattern  100   e  is formed in an Archimedean spiral shape in which four lines of the radiation pattern  100   e  converge on a center while being arranged to form a spiral line, and three open boundaries  121   a,    121   b,  and  121   c  are formed in each of the four lines. For the convenience of description, the open boundaries will be referred to as a “first open boundary,” a “second open boundary,” and a “third open boundary” in this order according to the distance from the center of the radiation pattern  100   e.  In addition, for the radiation units that are separated from each other by the open boundaries  121   a,    121   b,  and  121   c,  the radiation unit, which is positioned closer to the center than the first open boundary  121   a,  will be referred to as a “first radiation unit  111   a ,” the radiation unit, which is positioned between the first and second open boundaries  121   a  and  121   b , will be referred to as a “second radiation unit  111   b ,” the radiation unit, which is positioned between the second and third open boundaries  121   b  and  121   c,  will be referred to as a “third radiation unit  111   c ,” and the radiation unit, which is positioned closer to the edge than the third open boundary  121   c,  will be referred to as a “fourth radiation unit  111   d.”   
         [0071]    In a first frequency band (e.g., in the 6.78 MHz frequency band for wireless power transmission/reception), all the first to third open boundaries  121   a,    121   b,  and  121   c  may operate as short circuits. Accordingly, the whole of the first to fourth radiation units  111   a,    111   b,    111   c,  and  111   d  may form a first resonance frequency (e.g., 6.78 MHz that is a wireless power transmission/reception frequency). When all the first to third open boundaries  121   a,    121   b,  and  121   c  operate as open circuits, the first to fourth radiation units  111   a,    111   b ,  111   c , and  111   d  may form different resonance frequencies in a band that is different from that of the first resonance frequency. However, for a concise description, in the specific embodiment of the present disclosure, descriptions will be made on a configuration in which only the first radiation unit  111   a  forms the second resonance frequency when all the first to third open boundaries  121   a,    121   b,  and  121   c  operate as open circuits. 
         [0072]    Since the first radiation unit  111   a  is a portion of the radiation pattern  100   e , when all the first to third open boundaries  121   a,    121   b,  and  121   c  operate as open circuits, the second resonance frequency (e.g., 60 GHz) (Freq.2) may be formed in a band that is higher than the first resonance frequency that is formed by the whole of the first to fourth radiation units  111   a,    111   b,    111   c,  and  111   d.    
         [0073]    When the first open boundary  121   a  operates as a short circuit and the second and third open boundaries  121   b  and  121   c  operate as open circuits, the first and second radiations units  111   a  and  111   b  may be combined with each other to form a third resonance frequency (Freq.3). The third resonance frequency (Freq.3), which is formed by the combination of the first and second radiation units  111   a  and  111   b,  may be formed in a frequency band that is lower than the second resonance frequency (Freq.2) and higher than the first resonance frequency (e.g., the 2.1 GHz band). 
         [0074]    When the first and second open boundaries  121   a  and  121   b  operate as short circuits and the third open boundary  121   c  operates as an open circuit, the first to third radiation units  111   a,    111   b,  and  111   c  may be combined with each other to form a fourth resonance frequency (Freq.4). The fourth resonance frequency (Freq.4), which is formed by the combination of the first to third radiation units  111   a,    111   b , and  111   c  may be formed in a frequency band that is lower than the third resonance frequency (Freq.3) and higher than the first resonance frequency (e.g., the 700 MHz band). 
         [0075]    While the descriptions made with reference to  FIGS. 10 and 11  exemplify a configuration in which the combinations of radiations units are sequentially formed from the center of the radiation pattern, the present disclosure is not limited thereto. For example, in forming the second resonance frequency (Freq.2), only the third radiation unit may form the resonance frequency. In a certain embodiment, in forming the third resonance frequency (Freq.3), a combination of the third and fourth radiation units may form the resonance frequency. 
         [0076]    As described above, an antenna device, according to embodiments of the present disclosure, may have a radiation pattern that is formed by three or more radiation units that form a radiation pattern, and may selectively short-circuit each of the radiation units. Accordingly, the antenna device may form a resonance frequency for data communication in various frequency bands, as well as a resonance frequency for wireless power transmission by using an apparently single radiation pattern. Each of the radiation units may be selectively short-circuited by causing an open boundary to operate as any one of a short circuit and an open circuit by using the impedance of the open boundary for the frequency of a signal current that is applied to the radiation pattern. In a certain embodiment, each of the radiation units may be selectively short-circuited by arranging an active element in the open boundary. 
         [0077]    The preceding embodiments exemplify radiation patterns based on substantially spiral shapes. However, the radiation pattern of an antenna device, according to the present disclosure, is not limited thereto. For example, according to the embodiments of the present disclosure, the antenna device may include a radiation pattern in which different antenna structures, such as a radiation patch structure, a loop antenna structure, a micro-strip structure, and a meander line structure are combined with each other. A radiation pattern of an antenna device according to the sixth embodiment of the present disclosure is illustrated in  FIG. 12 . 
         [0078]      FIG. 12  is a diagram illustrating a radiation pattern of an antenna device according to the sixth one of embodiments of the present disclosure. 
         [0079]    As illustrated in  FIG. 12 , the radiation pattern  100   f  may include a patch type first radiation unit  111   a  that is surrounded by an open boundary  121 , and a second radiation unit  111   b  that is arranged to surround the open boundary  121 . 
         [0080]    The second radiation unit  111   b  may have a closed loop shape. In order to set the impedance of the open boundary  121 , a portion  113  of the first radiation unit  111   a  may protrude in the direction approaching the second radiation unit  111   b.    
         [0081]      FIG. 13  is a diagram illustrating an example of an electronic device that is equipped with an antenna device according to embodiments of the present disclosure. 
         [0082]    The electronic device  20  may be a medical probe (e.g., an ultrasonic probe). The electronic device  20  may transmit detected information (e.g., information about an ultrasonic image) to medical equipment  10 . The medical probe, such as an ultrasonic probe, is generally connected to medical equipment via a wire in order to supply power and transmit detected image information. However, the electronic device  20 , which is equipped with an antenna device including a radiation pattern, according to the embodiments of the present disclosure, may implement the charging of an embedded battery and the transmission of detected image information in a wireless manner. For example, in the radiation pattern of an antenna device according to the embodiments of the present disclosure, when an open boundary operates as a short circuit, the electronic device  20  may receive power from the medical equipment  10  in a wireless manner. During the detection of image information by the electronic device  20 , the image information, which is detected while the open boundary operates as an open circuit, may be transmitted to the medical equipment  10 . 
         [0083]      FIG. 14  is a diagram illustrating an application example of a medical probe that is equipped with an antenna device according to embodiments of the present disclosure. 
         [0084]    The antenna device  30 , which is mounted in the medical equipment  10 , may include a plurality of radiation patterns  100 . The radiation patterns  100  of the antenna device  30 , which is mounted in the medical equipment  10 , may conduct data communication in different frequency bands, respectively, and may conduct wireless power transmission/reception in a common frequency band. For example, each of the radiation patterns  100  may be set to be different from each other only in the position of the open boundary and to be equal to each other in the other design conditions. 
         [0085]    Accordingly, a plurality of electronic devices (e.g., medical probes)  20   a ,  20   b,  and  20   c  may be connected to, for example, single medical equipment  10  in a wireless manner. Each of the electronic devices  20   a,    20   b,  and  20   c  is capable of conducting wireless power transmission/reception in a common frequency band while conducting data communication with the medical equipment  10  in different frequency bands. As described above, the impedance by an open boundary is set differently depending on the length of the open boundary, and the frequency of a signal current that is applied to the active element arranged in the open boundary and each radiation pattern. 
         [0086]      FIG. 15  is a diagram illustrating another example of an electronic device that is equipped with an antenna device according to embodiments of the present disclosure. The embodiment illustrated in  FIG. 15  exemplifies an electronic device that is connected to a portable terminal  40  in a wireless manner (e.g., a removable lens barrel). The lens barrel  31  may be connected to the portable terminal  40  in an electric manner, rather than a mechanical manner. For example, image information, which is input through the lens barrel  31 , may be transmitted to the portable terminal  40  through a data communication frequency. At this time, the power of the lens barrel  31  may be provided from the portable terminal  40  in a wireless manner. When taking a photograph, the lens barrel is generally mechanically coupled to the portable terminal. However, upon being equipped with the antenna device, according to the embodiments of the present disclosure, the lens barrel  31  may transmit the input image information to the portable terminal  40  while receiving the power provided from the portable terminal  40  in a wireless manner. 
         [0087]    The lens barrel  31  may have a battery pack that is embedded therein, and may receive the charging power of the battery pack with the power that is provided from a wireless charging device or the portable terminal  40  in a wireless manner. 
         [0088]    In addition, the transmission of the information, which is input through the lens barrel  31 , to the portable terminal  40 , as well as the zoom-in/zoom-out operation of the lens barrel  31 , may be controlled through the portable terminal  40 . This is enabled by mounting the antenna devices, according to the embodiments of the present disclosure, to the lens barrel  31  and the portable terminal  40 , respectively. 
         [0089]      FIG. 16  is a diagram illustrating still another example of an electronic device that is equipped with an antenna device according to embodiments of the present disclosure. 
         [0090]    The electronic device  40  may be, for example, a portable terminal. However, upon being equipped with an antenna device, according to the embodiments of the present disclosure, the electronic device  40  may not only perform data communication with another electronic device (e.g., a personal computer), but may also be supplied with charging power through, for example, a personal computer. For example, a pad  33 , which is equipped with an antenna device, according to the embodiments of the present disclosure, and the electronic device  40  are capable of transmitting/receiving power and data in a wireless manner. When the pad  33  is mounted on another electronic device or is provided as an accessory device form to another electronic device, the electronic device  40  is capable of conducting data communication with the other electronic device, to which the pad  33  is connected, while receiving power for charging from the other electronic device through the pad  33 . 
         [0091]    While the present disclosure has been shown and described with reference to certain 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 present disclosure as defined by the appended claims.