Patent Publication Number: US-2021175613-A1

Title: Chip antenna module

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application is a continuation of application Ser. No. 16/456,048 filed on Jun. 28, 2019, which claims the benefit under 35 U.S.C. § 119(a) of Korean Patent Application Nos. 10-2018-0107603 and 10-2018-0137297 filed on Sep. 10, 2018 and Nov. 9, 2018, respectively, in the Korean Intellectual Property Office, the entire disclosures of which are incorporated herein by reference for all purposes. 
    
    
     BACKGROUND 
     Field 
     The following description relates to a chip antenna module. 
     Description of Related Art 
     Mobile communications terminals such as mobile phones, PDAs, navigation devices, notebook computers, and the like, supporting radio communications, have been developed to support functions such as CDMA, wireless LAN, DMB, near field communication (NFC), and the like. One important component enabling these functions is an antenna. 
     Meanwhile, an improved 5G or a spare 5G communication system is being developed to meet increasing demand for wireless data traffic after creation of fourth generation 4G communication systems such as long term evolution LTE. 
     Fifth generation 5G communication systems are considered to be implemented in higher frequency (mmWave) bands, such as in bands of 10 GHz to 100 GHz, in order to achieve a higher data transmission rate. 
     In order to decrease propagation loss of radio waves and increase a transmission distance of the radio waves, beamforming, multiple-input multiple output (MIMO), full dimensional MIMO (FD-MIMO), an array antenna, analog beamforming, and large-scale antenna techniques have been considered in relation to 5G communication systems. 
     However, in millimeter wave communications, to which the 5G communication systems are applied, since the wavelength may be as small as several millimeters, it is difficult to use antennas of the related art. Therefore, an antenna module appropriate for the millimeter wave communications band and having subminiature size such that the antenna module is capable of being mounted on a mobile communications terminal, is desirable. 
     SUMMARY 
     This Summary is provided to introduce a selection of concepts in a simplified form that are further described below in the Detailed Description. This Summary is not intended to identify key features or essential features of the claimed subject matter, nor is it intended to be used as an aid in determining the scope of the claimed subject matter. 
     In one general aspect, an antenna module includes: a board having a first surface including a ground region and a feed region; and chip antennas mounted on the first surface of the board, each of the chip antennas including a first antenna and a second antenna. The first antenna and the second antenna each include a ground portion bonded to the ground region, and a radiation portion bonded to the feed region. A length of a radiating surface of the first antenna is greater than a mounting height of the first antenna, and a mounting height of the second antenna is greater than a length of a radiating surface of the second antenna. A horizontal spacing distance between the radiation portion of the first antenna and the ground region is greater than a horizontal spacing distance between the radiation portion of the second antenna and the ground region. 
     The first antenna and the second antenna may be mounted on the board in a pair. 
     The board may include feed pads disposed in the feed region and bonded to the radiation portion. An outline of the ground region in an area facing the pair may be formed in a straight line. A distance between a feed pad, among the feed pads, to which the radiation portion of the first antenna is bonded and the ground region may be greater than a distance between a feed pad, among the feed pads, to which the radiation portion of the second antenna is bonded and the ground region. 
     The first surface may further include a device mounting portion on which an electronic device is mounted. The device mounting portion may be disposed inside the ground region. 
     The board may include feed pads disposed in the feed region and bonded to the radiation portion. The feed pads may be electrically connected to the electronic device. 
     A distance between a feed pad, among the feed pads, on which the first antenna is mounted and the ground region may be different from a distance between a feed pad, among the feed pads, on which the second antenna is mounted and the ground region. 
     An entire body portion of the first antenna may be disposed to face the feed region. 
     The first antenna may be configured to transmit and receive a horizontal polarization wave. The second antenna may be configured to transmit and receive a vertical polarization wave. 
     The feed region may be disposed along an edge of the board. 
     The chip antennas may be configured for radio communications in a frequency band of gigahertz, may be configured to receive a feed signal of a signal processing device, and may be configured to radiate the feed signal externally. The first antenna and the second antenna may each further include a hexahedron-shaped body portion having a dielectric constant, and including a first surface and a second surface opposing the first surface. The radiation portion may have a hexahedral shape and may be coupled to the first surface of the body portion. The ground portion may have a hexahedral shape and may be coupled to the second surface of the body portion. 
     The board may include feed pads disposed in the feed region and bonded to the radiation portion. The ground region may extend in a region facing the second antenna toward a feed pad, among the feed pads, to which the second antenna is bonded. 
     The board may include feed pads disposed in the feed region and bonded to the radiation portion, and ground pads disposed in the ground region and bonded to the ground portion. An outline of the ground region may be disposed adjacent to a feed pad, among the feed pads, to which the second antenna is bonded in a region facing the second antenna, and may be disposed adjacent to a ground pad, among the ground pads, to which the first antenna is bonded in a region facing the first antenna. 
     An outline segment of the ground region disposed between the first antenna and the second antenna may have a linear shape or an arcuate shape. 
     Horizontal spacing distances may be formed between the radiation portion of the first antenna and the ground region in an area of the ground region facing the first antenna. 
     In another general aspect, an antenna module includes: a board having a first surface including a ground region and a feed region; and chip antennas mounted on the first surface, each of the chip antennas including a first antenna and a second antenna. The first antenna and the second antenna may each include a ground portion bonded to a respective ground pad disposed in the ground region, and a radiation portion bonded to a respective feed pad disposed in the feed region. The first antenna may be configured to transmit and receive a horizontal polarization wave, and the second antenna may be configured to transmit and receive a vertical polarization wave. A horizontal spacing distance between the feed pad to which the radiation portion of the first antenna is bonded and the ground region may be greater than a horizontal spacing distance between the feed pad to which the radiation portion of the second antenna is bonded and the ground region. 
     The first antenna and the second antenna may be mounted on the board in a pair. 
     The first antenna and the second antenna may each further include a body portion formed of a dielectric material and disposed between the ground portion and the radiation portion. 
     A portion of the ground region that faces the body portion of the first antenna may be smaller than a portion of the ground region that faces the body portion of the second antenna. 
     Other features and aspects will be apparent from the following detailed description, the drawings, and the claims. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         FIG. 1  is a plan view of a chip antenna module, according to an embodiment. 
         FIG. 2  is an exploded perspective view of the chip antenna module illustrated in  FIG. 1 . 
         FIG. 3  is an enlarged view of portion A of  FIG. 1 . 
         FIG. 4  is a cross-sectional view taken along line IV-IV′ of  FIG. 1 . 
         FIG. 5  is an enlarged perspective view of the chip antenna illustrated in  FIG. 1 . 
         FIG. 6  is a cross-sectional view taken along line VI-VI′ of  FIG. 5 . 
         FIGS. 7 to 12  are views illustrating chip antennas according to embodiments. 
         FIG. 13  is a schematic perspective view illustrating a portable terminal on which a chip antenna module is mounted. 
         FIGS. 14 and 15  are graphs illustrating radiation patterns of the chip antenna module. 
     
    
    
     Throughout the drawings and the detailed description, the same reference numerals refer to the same elements. The drawings may not be to scale, and the relative size, proportions, and depiction of elements in the drawings may be exaggerated for clarity, illustration, and convenience. 
     DETAILED DESCRIPTION 
     The following detailed description is provided to assist the reader in gaining a comprehensive understanding of the methods, apparatuses, and/or systems described herein. However, various changes, modifications, and equivalents of the methods, apparatuses, and/or systems described herein will be apparent after an understanding of the disclosure of this application. For example, the sequences of operations described herein are merely examples, and are not limited to those set forth herein, but may be changed as will be apparent after an understanding of the disclosure of this application, with the exception of operations necessarily occurring in a certain order. Also, descriptions of features that are known in the art may be omitted for increased clarity and conciseness. 
     The features described herein may be embodied in different forms, and are not to be construed as being limited to the examples described herein. Rather, the examples described herein have been provided merely to illustrate some of the many possible ways of implementing the methods, apparatuses, and/or systems described herein that will be apparent after an understanding of the disclosure of this application. 
     Herein, it is noted that use of the term “may” with respect to an example or embodiment, e.g., as to what an example or embodiment may include or implement, means that at least one example or embodiment exists in which such a feature is included or implemented while all examples and embodiments are not limited thereto. 
     Throughout the specification, when an element, such as a layer, region, or substrate, is described as being “on,” “connected to,” or “coupled to” another element, it may be directly “on,” “connected to,” or “coupled to” the other element, or there may be one or more other elements intervening therebetween. In contrast, when an element is described as being “directly on,” “directly connected to,” or “directly coupled to” another element, there can be no other elements intervening therebetween. 
     As used herein, the term “and/or” includes any one and any combination of any two or more of the associated listed items. 
     Although terms such as “first,” “second,” and “third” may be used herein to describe various members, components, regions, layers, or sections, these members, components, regions, layers, or sections are not to be limited by these terms. Rather, these terms are only used to distinguish one member, component, region, layer, or section from another member, component, region, layer, or section. Thus, a first member, component, region, layer, or section referred to in examples described herein may also be referred to as a second member, component, region, layer, or section without departing from the teachings of the examples. 
     Spatially relative terms such as “above,” “upper,” “below,” and “lower” may be used herein for ease of description to describe one element&#39;s relationship to another element as shown in the figures. Such spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, an element described as being “above” or “upper” relative to another element will then be “below” or “lower” relative to the other element. Thus, the term “above” encompasses both the above and below orientations depending on the spatial orientation of the device. The device may also be oriented in other ways (for example, rotated  90  degrees or at other orientations), and the spatially relative terms used herein are to be interpreted accordingly. 
     In addition, in the following specification, terms “upper side”, “lower side”, “side surface”, and the like, are represented based on the drawings and may be differently represented when directions of corresponding targets are changed. 
     The terminology used herein is for describing various examples only, and is not to be used to limit the disclosure. The articles “a,” “an,” and “the” are intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms “comprises,” “includes,” and “has” specify the presence of stated features, numbers, operations, members, elements, and/or combinations thereof, but do not preclude the presence or addition of one or more other features, numbers, operations, members, elements, and/or combinations thereof. 
     Due to manufacturing techniques and/or tolerances, variations of the shapes shown in the drawings may occur. Thus, the examples described herein are not limited to the specific shapes shown in the drawings, but include changes in shape that occur during manufacturing. 
     The features of the examples described herein may be combined in various ways as will be apparent after an understanding of the disclosure of this application. Further, although the examples described herein have a variety of configurations, other configurations are possible as will be apparent after an understanding of the disclosure of this application. 
     A chip antenna module describe herein may operate in a high frequency region, and may operate in a frequency band of, for example, 3 GHz or more and 30 GHz or less. In addition, the chip antenna module described herein may be mounted in an electronic device configured to receive or transmit radio signals. For example, a chip antenna may be mounted in a mobile phone, a portable laptop computer, a drone, or the like. 
       FIG. 1  is a plan view of a chip antenna module  1 , according to an embodiment.  FIG. 2  is an exploded perspective view of the chip antenna module  1 . In addition,  FIG. 3  is an enlarged view of portion A of  FIG. 1 , and  FIG. 4  is a cross-sectional view taken along line IV-IV′ of  FIG. 1 . 
     Referring to  FIGS. 1 to 4 , the chip antenna module  1  may include a board  10 , an electronic device  50 , and a chip antenna  100 . 
     The board  10  may be a circuit board on which a circuit or an electronic component that is necessary for a radio antenna is mounted. For example, the board  10  may be a (Printed Circuit Board) PCB containing one or more electronic components therein or having one or more electronic components mounted on a surface thereof. Therefore, the board  10  may be provided with circuit wirings electrically connecting the electronic components to each other. 
     As shown in  FIG. 4 , the board  10  may be a multilayer board formed by repeatedly stacking a plurality of insulating layers  17  and a plurality of wiring layers  16 . However, if necessary, a double-sided board on which wiring layers are formed on two opposite surfaces of one insulating layer may also be used. 
     A material of an insulating layer  17  is not particularly limited. For example, a thermosetting resin such as an epoxy resin, a thermoplastic resin such as polyimide, or a resin impregnated with a core material such as a a glass fiber, a glass cloth, and a glass fabric together with an inorganic filler, for example, an insulating material such as a prepreg, an Ajinomoto Build-up Film (ABF), FR-4, or bismaleimide triazine (BT) may be used for the insulating layer  17 . As required, a photo imageable dielectric (PID) resin may be used. 
     The wiring layers  16  may electrically connect the electronic device  50  and the chip antennas  100 , which will be described later, to each other. In addition, the wiring layers  16  may electrically connect the electronic device  50  or the chip antennas  100  externally. 
     Copper (Cu), aluminum (Al), silver (Ag), tin (Sn), gold (Au), nickel (Ni), lead (Pb), titanium (Ti) or a conductive material such as an alloy of Cu, Al, Ag, Sn, Au, Ni, Pb, or Ti may be used as a material of the wiring layers  16 . 
     Interlayer connection conductors  18  for connecting the wiring layers  16  in a stacked configuration may be disposed inside the insulating layers  17 . 
     In addition, an insulating protective layer  19  may be disposed on upper and lower surfaces of the board  10 . The insulating protective layer  19  may be disposed to cover the upper surfaces of the uppermost insulating layer  17  and the uppermost wiring layer  16  and the lower surfaces of the lowermost insulating layer  17  and the lowermost wiring layer  16 . Thus, the wiring layer  16  disposed on the upper surface or the lower surface of the insulating layer  17  may be protected. 
     The insulating protective layer  19  may have openings exposing at least a portion of the uppermost wiring layer  16  and the lowermost wiring layer  16 . The insulating protective layer  19  may include an insulating resin and an inorganic filler, but may not include a glass fiber. For example, a solder resist may be used as the insulating protective layer  19 , but the insulating protective layer  19  is not limited to being formed of a solder resist. 
     Various kinds of boards (for example, a printed circuit board, a flexible board, a ceramic board, a glass board, and the like) well-known in the art may be used as the board  10 . 
     As illustrated in  FIG. 2 , a first surface of the board  10 , which may be an upper surface of the board  10 , may be divided into a device mounting portion  11   a , a ground region  11   b , and a feed region  11   c.    
     The device mounting portion  11   a , a region on which the electronic device  50  is mounted, may be disposed inside the ground region  11   b  to be described below. A plurality of connection pads  12   a  to which the electronic device  50  is electrically connected may be disposed in the device mounting portion  11   a.    
     The ground region  11   b , which is a region on which a ground layer  16   a  is disposed, may be disposed to surround the device mounting portion  11   a . Therefore, the device mounting portion  11   a  may be disposed inside the ground region  11   b.    
     One of the wiring layers  16  of the board  10  may be configured as the ground layer  16   a . For example, the ground layer  16   a  may be disposed on the surface (uppermost or lowermost surface) of the insulating layer  17  or between two insulating layers  17 , which are stacked one on top of the other. 
     In the illustrated embodiment, the device mounting portion  11   a  may be formed to have a rectangular shape. Therefore, the ground region  11   b  may be disposed to surround the device mounting portion  11   a  in a form of a rectangular ring shape. However, the disclosure is not limited to such a configuration. 
     Since the ground region  11   b  is disposed along a circumference of the device mounting portion  11   a , the connection pad  12   a  of the device mounting portion  11   a  may be electrically connected to an external device or other components through interlayer connection conductors  18  penetrating through the insulating layers  17  of the board  10  (see  FIG. 4 ). 
     A plurality of ground pads  12   b  may be formed in the ground region  11   b . The ground pad  12   b  may be formed by partially opening an insulating protective layer (not shown) covering the ground layer  16   a . Therefore, in this case, the ground pad  12   b  may be configured as a portion of the ground layer  16   a . However, the disclosure is not limited to this example, and when the ground layer  16   a  is disposed between two insulating layers  17 , the ground pad  12   b  may be disposed on the upper surface of the uppermost insulating layer  17 , and the ground pad  12   b  and the ground layer  16   a  may be connected to each other through the interlayer connection conductor  18 . 
     The ground pads  12   b  may be disposed in pairs with respective feed pads  12   c  to be described later. Therefore, the ground pad  12   b  may be disposed adjacent to the feed pad  12   c , and be disposed in parallel with the feed pad  12   c.    
     The feed region  11   c  may be disposed outside the ground region  11   b . In the illustrated embodiment, the feed region  11   c  may be formed outside two sides formed by the ground region  11   b . Therefore, the feed region  11   c  may be disposed along a corner of the board  10 . However, the disclosure is not limited to such a configuration. 
     A plurality of feed pads  12   c  may be disposed in the feed region  11   c . The feed pad  12   c  may be disposed on the surface of the uppermost insulating layer  17 , and a radiation portion  130   a  ( FIG. 5 ) of the chip antenna  100  may be bonded to the feed pad  12   c.    
     The feed pad  12   c  may be electrically connected to the electronic device  50  or other components through the interlayer connection conductor  18 , which penetrates through the insulating layer(s)  17  of the board  10  and the wiring layer  16 . 
     The device mounting portion  11   a , the ground region  11   b , and the feed region  11   c  may be defined depending on a shape or a position of the ground layer  16   a  in the board  10  configured as described above. In addition, connection pads  12   a , ground pads  12   b , and feed pads  12   c  may be exposed externally in the form of a pad through the opening in which the insulating protective layer  19  is removed. 
     The electronic device  50  may be mounted on a device mounting portion  11   a  of the board  10 . The electronic device  50  may be bonded to the connection pad  12   a  of the device mounting portion  11   a  via a conductive adhesive such as a solder. 
     Although a case in which one electronic device  50  is mounted is described as an example in the present embodiment, a plurality of electronic devices  50  may be mounted, as required. 
     The electronic device  50  may include at least one active device and may include, for example, a signal processing device configured to apply a signal to a feeding portion of an antenna. In addition, the electronic device  50  may include a passive device as required. 
     The chip antenna  100  may be used for radio communication in a gigahertz frequency band, and may be mounted on the board  10  to receive a feed signal from the electronic device  50  and radiate the feed signal externally. 
     The chip antenna  100  may be formed to have a hexahedral shape as a whole, and both ends of the chip antenna  100  may be bonded to the feed pad  12   c  and the ground pad  12   b  of the board  10 , respectively, via the conductive adhesive such as a solder, and mounted on the board  10 . 
       FIG. 5  is an enlarged perspective view of the chip antenna  100 .  FIG. 6  is a cross-sectional view taken along line VI-VI′ of  FIG. 5 . 
     Referring to  FIGS. 5 and 6 , the chip antenna  100  may include a body portion  120 , a radiation portion  130   a , and a ground portion  130   b.    
     The body portion  120  may have a hexahedral shape and may be formed of a dielectric substance. For example, the body portion  120  may be formed of a polymer having a dielectric constant, or may be formed of a ceramic sintered body. 
     In the described embodiment, a chip antenna used in a 3 GHz to 30 GHz band is taken as an example. 
     A wavelength(A) of an electromagnetic wave in a band of 3 GHz to 30 GHz may be 100 mm to 10 mm, and a length of an antenna may theoretically be λ, λ/2, and λ/4. Therefore, the length of the antenna should be configured to be approximately 50 mm to 2.5 mm. However, as in the described embodiment, when the body portion  120  is formed of a material having a dielectric material having a higher dielectric constant than air, the length of the antenna may be remarkably reduced. 
     The body portion  120  of the chip antenna  100  may be formed of a material having a dielectric constant of 3.5 to 25. In this case, the maximum length of the chip antenna  100  may be in a range of 0.5 to 2 mm. 
     When the dielectric constant of the body portion  120  is less than 3.5, a distance between the radiation portion  130   a  and the ground portion  130   b  should be increased for the chip antenna  100  to operate normally. 
     As a test result, it was determined that in a case in which the dielectric constant of the body portion  120  is less than 3.5, the chip antenna  100  performed a normal function in the band of 3 GHz to 30 GHz when a maximum width W (as illustrated in  FIG. 6 ) of the chip antenna  100  was 2 mm or more. However, in this case, an overall size of the chip antenna  100  may be increased, such that it is difficult to mount the chip antenna  100  in a thin portable device. 
     Therefore, the length of the longest side of the chip antenna  100  may be 2 mm or less in consideration of the length of the wavelength and the mounting size. For example, the length of the chip antenna  100  may be 0.5 to 2 mm, in order to adjust a resonance frequency in the above-described frequency band. 
     In addition, when the dielectric constant of body portion  120  exceeds 25, a size of the chip antenna needs to be decreased to 0.3 mm or less. In this case, it was measured that antenna performance was rather deteriorated. 
     Therefore, the body portion  120  of the chip antenna  100  may be formed of a dielectric having a dielectric constant greater than or equal to 3.5 and less than or equal to 25. 
     However, the disclosure is not limited to the above examples, and the size of the chip antenna  100  and the dielectric constant of the body portion  120  may be changed according to the frequency band in which the chip antenna  100  is used. 
     The radiation portion  130   a  may be coupled to a first surface of the body portion  120 . The ground portion  130   b  may be coupled to a second surface to the body portion  120 . Here, the first surface and the second surface of the body portion  120  may mean two surfaces facing opposite directions from the body portion  120  formed as a hexahedron. 
     Referring to  FIG. 6 , a width W 1  of the body portion  120  may be a distance between the first surface and the second surface. Therefore, a direction facing the second surface from the first surface of the body portion  120  (or a direction facing the first surface from the second surface of the body portion  120 ) may be defined as a width direction of the body portion  120  or the chip antenna  100 . 
     In addition, widths W 2  and W 3  of the radiation portion  130   a  and the ground portion  130   b  may each be a distance in the width direction of the chip antenna. Therefore, the width W 2  of the radiation portion  130   a  may be the shortest distance from a bonding surface of the radiation portion  130   a  bonded to the first surface of the body portion  120  to an opposite surface of the radiation portion  130   a , and the width W 3  of the ground portion  130   b  may be the shortest distance from a bonding surface of the ground portion  130   b  bonded to the second surface of the body portion  120  to an opposite surface of the ground portion  130   b.    
     The radiation portion  130   a  may be in contact with only one of six surfaces of the body portion  120 , and may be coupled to the body portion  120 . Similarly, the ground portion  130   b  may be also in contact with only one of the six surfaces of the body portion  120 , and may be coupled to the body portion  120 . 
     The radiation portion  130   a  and the ground portion  130   b  may not be disposed on surfaces other than the first and second surfaces of the body portion  120 , and may be disposed parallel to each other with the body portion  120  interposed therebetween. 
     In a conventional chip antenna used in a low frequency band, a radiation portion and a ground portion may be disposed in a thin film form on a lower surface of the body portion. In this case, since a distance between the radiation portion and the ground portion is close to each other, a loss due to inductance may be generated. In addition, since it is difficult to precisely control the distance between the radiation portion and the ground portion in the manufacturing process, accurate capacitance may not be predicted, and it is difficult to adjust a resonance point, which makes tuning of the impedance difficult. 
     However, in the chip antenna  100 , the radiation portion  130   a  and the ground portion  130   b  may be coupled to the first surface and the second surface of the body portion  120 , respectively. In the illustrated embodiment, the radiation portion  130   a  and the ground portion  130   b  may each be formed to have a hexahedral shape, and one surface of the hexahedrons may be bonded to the first surface and the second surface of the body portion  120 , respectively. 
     When the radiation portion  130   a  and the ground portion  130   b  are bonded only to the first surface and the second surface of the body portion  120 , a spacing distance between the radiation portion  130   a  and the ground portion  130   b  may be defined only by the size of the body portion  120 , such that all of the above-described problems may be solved. 
     In addition, since the chip antenna  100  has capacitance due to a dielectric (for example, a body portion) disposed between the radiation portion  130   a  and the ground portion  130   b , a coupling antenna may be designed or a resonant frequency may be tuned, using the dielectric. 
     The radiation portion  130   a  and the ground portion  130   b  may be formed of the same material. In addition, the radiation portion  130   a  and the ground portion  130   b  may be formed in the same shape and the same structure. In this case, the radiation portion  130   a  and the ground portion  130   b  may be classified according to a type of a pad to be bonded thereto when mounting the radiation portion  130   a  and the ground portion  130   b  on the board  10 . 
     For example, in the chip antenna  100 , a portion bonded to the feed pad  12   c  of the board  10  may function as the radiation portion  130   a , and a portion bonded to the ground pad  12   b  of the board  10  may function as the ground portion  130   b . However, the disclosure is not limited to such a configuration. 
     The radiation portion  130   a  and the ground portion  130   b  may each include a first conductor  131  and a second conductor  132 . 
     The first conductor  131  may be a conductor directly bonded to the body portion  120  and may be formed to have a block shape. The second conductor  132  may be formed to have a layer shape along a surface of the first conductor  131 . 
     The first conductor  131  may be formed on one surface of the body portion  120  through a printing process or a plating process, and may be formed of any one selected from Ag, Au, Cu, Al, Pt, Ti, Mo, Ni, and W or alloys of any two or more selected from Ag, Au, Cu, Al, Pt, Ti, Mo, Ni, and W. In addition, the first conductor  131  may also be formed of a conductive paste or a conductive epoxy in which an organic material such as a polymer or a glass is contained. 
     The second conductor  132  may be formed on the surface of the first conductor  131  through the plating process. The second conductor  132  may be formed by sequentially stacking a nickel (Ni) layer and a tin (Sn) layer or sequentially stacking a zinc (Zn) layer and a tin (Sn) layer, but is not limited to these examples. 
     The chip antenna  100  configured as described above may include a first antenna  100   a  and a second antenna  100   b.    
     The first antenna  100   a  and the second antenna  100   b  may have different mounting heights H 01  and H 02  as illustrated in  FIGS. 2 and 4 . Specifically, the mounting height H 02  of the second antenna  100   b  may be larger than the mounting height H 01  of the first antenna  100   a . In this example, the mounting heights H 01  and H 02  may be a distance from a mounting surface of the board  10  to an upper surface of the chip antenna  100 . A length L 01  of the radiation portion  130   a  of the first antenna  100   a  may be formed to be longer than a length L 02  of the radiation portion  130   a  of the second antenna  100   b.    
     The lengths L 01  and L 02  of the radiation portion  130   a  may be a transverse length of a radiating surface R (a surface disposed to face the outside of the board  10 ) while the chip antenna  100  is mounted on the board  10 . 
     Accordingly, when viewed in a direction of B of  FIG. 2 , the first antenna  100   a  may be formed such that the length L 01  of the radiating surface of the first antenna  100   a  is greater than the mounting height H 01  (or thickness). The second antenna  100   b  may be formed such that the mounting height H 02  (or thickness) is greater than the length L 02  of the radiating surface. 
     Generally, in the antenna, a region in which current is distributed may differ depending on the shape of the conductor of an antenna radiation portion when transmitting/receiving signals. The antenna may be classified into a horizontal polarization antenna and a vertical polarization antenna based on a direction of a polarized wave surface (or an electric field) of radio waves and a ground surface. 
     A radio wave in which a polarized wave surface is radiated horizontally with respect to a ground surface may be a horizontal polarization wave, and a radio wave in which a polarized wave surface is radiated vertically with respect to a ground surface may be a vertical polarization wave. 
     In the embodiment described herein, since a radiating surface R of the first antenna  100   a  is disposed long in a horizontal direction with respect to the ground layer  16   a , current distribution may be performed in the horizontal direction. Therefore, the first antenna  100   a  may be used as an antenna for horizontal polarization. In addition, since a radiation surface R of the second antenna  100   b  is disposed long in a vertical direction with respect to the ground layer  16   a , current distribution may be performed in the vertical direction. Therefore, the second antenna  100   b  may be used as an antenna for vertical polarization. 
     In the chip antenna  100 , first antennas  100   a  and second antennas  100   b  may be mounted on the board  10  in pairs. Therefore, the antenna for vertical polarization and the antenna for horizontal polarization are disposed in a pair, and, accordingly, radiation performance of the antenna module  1  may be improved. 
     Referring to  FIG. 3 , an overall width W 01  of the first antenna  100   a  may be less than an overall width W 02  of the second antenna  100   b . However, the present disclosure is not limited to this configuration, and the overall width W 01  of the first antenna  100   a  and the overall width W 02  of the second antenna  100   b  may be the same, or the overall width W 01  of the first antenna  100   a  may be greater than the overall width W 02  of the second antenna  100   b . As described above, various modifications are possible as needed. 
     Since the first antenna  100   a  and the second antenna  100   b  are configured to transmit/receive different polarized waves, in the antenna module  1 , the first antenna  100   a  and the second antenna  100   b  may need to be designed for each polarization. 
     When the chip antenna  100  is mounted along an outer periphery of the board  10  as in the disclosed embodiment, antenna characteristics may be changed according to the distance between the ground region  11   b  and the radiation portion  130   a  (or the feed pad). 
     Therefore, in order for both the first antenna  100   a  and the second antenna  100   b  to smoothly transmit/receive the horizontal polarization wave and the vertical polarization wave, there is need to optimize the distance between the ground region  11   b  and the radiation portion  130   a.    
     Thus, a horizontal spacing distance D 1  (hereinafter, referred to as a first distance) between the radiation portion  130   a  of the first antenna  100   a  and the ground region  11   b  may be greater than a horizontal spacing distance D 2  (hereinafter, referred to as a second distance) between the radiation portion  130   a  of the second antenna  100   b  and the ground region  11   b . Since the radiation portion  130   a  is bonded to the feed pad  12   c , the horizontal spacing distance between the radiation portion  130   a  and the ground region  11   b  may be understood as a horizontal spacing distance between the feed pad  12   c  and the ground region  11   b.    
     As illustrated in  FIG. 3 , an entire first distance D 1  may be longer than a second distance D 2 . 
     As shown in  FIG. 3 , the ground region  11   b  may be disposed in a region facing the ground portion  130   b  of the first antenna  100   a , and may have a removed (e.g., recessed) shape in a region in which the body portion  120  and the board  10  face each other. Therefore, the ground region  11   b  may be hardly disposed in the region in which the board  10  faces the body portion  120  of the first antenna  100   a . For example, the entire body portion  120  of the first antenna  100   a  may be disposed to face the feed region  11   c.    
     Still referring to  FIG. 3 , an outline  11   b ′ of the ground region  11   b  in the region in which the first antenna  100   a  and the board  10  face each other may be disposed along a boundary of the ground portion  130   b  of the first antenna  100   a  and the body portion  120  and may be disposed at a position adjacent to the boundary. 
     The second antenna  100   b  may be configured such that half or more of the body portion  120  faces the ground region  11   b.    
     However, the disclosure is not limited to the foregoing examples, and various modifications are possible. For example, the first antenna  100   a  may be configured such that half of the body portion  120  faces the ground region  11   b , and the second antenna  100   b  may be configured such that a region exceeding half of the body portion  120  faces the ground region  11   b . Various modifications may be possible within a range in which the first distance D 1  is larger than the second distance D 2 . 
     Since the first distance D 1  and the second distance D 2  are differently configured as described above, the antenna module  1  may improve an antenna gain. 
       FIGS. 14 and 15  are graphs illustrating measurement results of radiation patterns of a chip antenna module.  FIG. 14  is a graph illustrating a measurement result of a radiation pattern of the chip antenna  100  by configuring the first distance D 1  and the second distance D 2  to be the same.  FIG. 15  is a graph illustrating a measurement result of a radiation pattern of the chip antenna  100  by configuring the first distance D 1  to be greater than the second distance D 2 , as illustrated in  FIG. 3 . 
     When the first distance D 1  and the second distance D 2  were the same, it was measured, as illustrated in  FIG. 14 , that a maximum gain of the first antenna  100   a  was 2.1 dB, and a maximum gain of the second antenna  100   b  was 2.7 dB. When the first distance D 1  was configured to be larger than the second distance D 2 , it was measured, as illustrated in  FIG. 15 , that a maximum gain of the first antenna  100   a  was 2.6 dB, and a maximum gain of the second antenna  100   b  was 2.5 dB. 
     Therefore, it was confirmed that, when the first distance D 1  is greater than the second distance D 2 , a gain of the second antenna  100   b  may be somewhat reduced, but the gain of the first antenna  100   a  may be greatly improved. 
     In the case of the antenna module for radio communications, the maximum gain of the chip antenna may be required to be 2.5 dB or more for smooth operation. Therefore, as illustrated in  FIG. 14 , when the maximum gain of the first antenna  100   a  is 2.1 dB or more, radio communications may not be performed smoothly. 
     On the other hand, in the antenna module  1  in which the first distance D 1  is configured to be larger than the second distance D 2 , it can be known that the maximum gains of the first antenna  100   a  and the second antenna  100   b  are all 2.5 dB or more, as illustrated in  FIG. 15 , such that the radio communications may be performed smoothly. 
     The disclosure is not limited to the above-described embodiments, and various modifications may be made as illustrated in  FIGS. 7 to 12 . 
       FIGS. 7 to 12  are views illustrating chip antennas, according to embodiments, which illustrate planes corresponding to  FIG. 3 . 
     Referring to  FIG. 7 , an area of the ground region  11   b  facing the second antenna  100   b  may extend toward the feed pad  12   c  farther than other areas of the ground region  11   b . Thus, since the second distance D 2  between the radiation portion  130   a  of the second antenna  100   b  and the ground region  11   b  is reduced, as compared to the first distance D 1  between the radiation portion  130   a  of the first antenna  100   a  and the ground region  11   b , the first distance D 1  may be configured to be larger than the second distance D 2 . 
       FIG. 8  is a combination of the configurations of the above-described  FIGS. 3 and 7 . In  FIG. 8 , the outline  11   b ′ of the ground region  11   b  may be disposed adjacent to the feed pad  12   c  to which the second antenna  100   b  is bonded in the region facing the second antenna  100   b , and may be disposed adjacent to the ground pad  12   b  to which the first antenna  100   a  is bonded in the region facing the first antenna  100   a.    
     Therefore, the first distance D 1  between the radiation portion  130   a  of the first antenna  100   a  and the ground region  11   bn  may be increased, and the second distance D 2  between the radiation portion  130   a  of the second antenna  100   b  and the ground region  11   b  may be reduced. 
     Referring to  FIGS. 9 and 10 , the ground region  11   b  may be configured to be similar to the ground region  11   b  illustrated in  FIG. 3 , and may be configured differently from a portion not facing the chip antenna  100  of the ground region  11   b . An outline segment  11   b ″ of the ground region  11   b  that is disposed between the first antenna  100   a  and the second antenna  100   b  may have a linear shape or an arcuate shape. 
       FIG. 9  illustrates a case in which the ground region  11   b  is formed such that the outline segment  11   b ″ of the ground region  11   b  disposed between the first antenna  100   a  and the second antenna  100   b  has a linear shape, and  FIG. 10  illustrates a case in which the ground region  11   b  is formed such that the outline segment  11   b ″ of the same ground region  11   b  has an arcuate shape. 
     When the shape of the outline segment  11   b ″ of the ground region  11   b  disposed between a first antenna  100   a  and a second antenna  100   b  is deformed, since the horizontal spacing distance between the radiation portion  130   a  of the first antenna  100   a  and the ground region  11   b  around the first antenna  100   a  is changed, an antenna gain may be adjusted. 
     Referring to  FIG. 11  the ground region  11   b  may be disposed to partially face the body portion  120  of the first antenna  100   a . Therefore, the ground region  11   b  may be partially disposed even on a lower portion of the body portion  120  of the first antenna  100   a.    
     In this case, a plurality of horizontal spacing distances D 11  and D 12  may be formed between the radiation portion  130   a  of the first antenna  100   a  and the ground region  11   b . At least one D 12  of the plurality of horizontal spacing distances D 11  and D 12  may be formed to be larger than the second distance D 2 . 
     In the above-described embodiments, the feed pad  12   c  to which the first antenna  100   a  is bonded and the feed pad  12   c  to which the second antenna  100   b  is bonded may be disposed on a straight line, and the first distance D 1  and the second distance D 2  may be differently configured by changing the position of the outline  11   b ′ of the ground region  11   b.    
     However, in the antenna module illustrated in  FIG. 12 , the outline  11   b ′ of the ground region  11   b  may be formed in a straight line, and the first distance D 1  and the second distance D 2  may be differently configured by changing the position of the feed pad  12   c . More specifically, the feed pad  12   c  to which the second antenna  100   b  is bonded may be moved to the ground region  11   b.    
     Therefore, the feed pad  12   c  to which the second antenna  100   b  is bonded may be disposed closer to the ground region  11   b  than the feed pad  12   c  to which the first antenna  100   a  is bonded, and thus, the first distance D 1  may be greater than the second distance D 2 . 
     The chip antenna module  1  may have both the antenna for horizontal polarization and the antenna for vertical polarization, and a distance between the feed pad and the ground region of the antenna for horizontal polarization may be different from a distance between the feed pad and the ground region of the antenna for vertical polarization. Therefore, radiation efficiency of the chip antenna  100  may be increased. 
       FIG. 13  is a schematic perspective view illustrating a portable terminal  200  on which chip antenna modules  1  are mounted. 
     Referring to  FIG. 13 , the chip antenna module  1  may be disposed at a corner of a portable terminal  200 . In this case, in the chip antenna module  1 , the chip antenna  100  may be disposed adjacent to the corner of the portable terminal  200 . 
     A case in which the chip antenna module  1  are disposed at all four corners of the portable terminal  200  is illustrated in  FIG. 13  as an example, but the disclosure is not limited to this example. When an internal space of the portable terminal  200  is insufficient, a dispositional structure of the chip antenna module  1 , such as disposing only two chip antenna modules in a diagonal direction of the portable terminal  200 , and the like, may be modified into various forms as needed. 
     In addition, in the chip antenna module  1 , the feed region  11   c  of  FIG. 1  may be disposed adjacent to an edge of the portable terminal  200 . The radio waves radiated through the first antenna  100   a  of the chip antenna module  1  may be radiated in a direction of a surface of the portable terminal  200  toward the outside of the portable terminal  200  from the corner portion of the portable terminal  200 . The radio wave radiated through the second antenna  100   b  may be radiated in a thickness direction of the portable terminal  200 . 
     As set forth above, the chip antenna modules according to the present disclosure may have both an antenna for horizontal polarization and an antenna for vertical polarization, and a distance between the radiation portion and a ground region of the antenna for horizontal polarization, and a distance between the radiation portion and a ground region of the antenna for vertical polarization may be configured differently. Therefore, the radiation efficiency of the chip antenna  100  may be increased. 
     While this disclosure includes specific examples, it will be apparent after an understanding of the disclosure of this application that various changes in form and details may be made in these examples without departing from the spirit and scope of the claims and their equivalents. The examples described herein are to be considered in a descriptive sense only, and not for purposes of limitation. Descriptions of features or aspects in each example are to be considered as being applicable to similar features or aspects in other examples. Suitable results may be achieved if the described techniques are performed in a different order, and/or if components in a described system, architecture, device, or circuit are combined in a different manner, and/or replaced or supplemented by other components or their equivalents. Therefore, the scope of the disclosure is defined not by the detailed description, but by the claims and their equivalents, and all variations within the scope of the claims and their equivalents are to be construed as being included in the disclosure.