Antenna device

Abstract

To provide an antenna device capable of preventing an increase in product size as well as improving signal quality. [Solution] The antenna device includes a first antenna patch panel that radiates an operating frequency of a first frequency band and at least one second antenna patch panel that radiates an operating frequency higher than the first frequency band, and the first antenna patch panel is provided with a frequency selective transmission pattern portion for transmitting a beam of the operating frequency radiated from the second antenna patch panel (hereinafter referred to as a 'middle beam'), and the frequency selective transmission pattern portion has a conductive pattern portion of the first patch panel that overlaps completely or at least partially in the radiation direction of the middle beam of the second antenna patch panel.

Description

[Technical Field]

[0001] The present invention relates to an antenna apparatus, and more particularly to an antenna apparatus that can maximize beamforming characteristics by minimizing interference between radiated beams between antenna patch panels that are arranged to cover multiple primary bands. [Background technology]

[0002] Recently, multi-band antenna devices capable of communicating in multiple frequency bands have been deployed practically as antenna devices for mobile communication base stations and WiFi communication equipment antenna devices in order to ensure communication capacity.

[0003] FIG. 1 shows an example of a plan view (a) and a perspective view (b) illustrating an arrangement of antenna patch panels in a configuration of a multiband antenna device according to conventional technology.

[0004] The multi-band antenna device includes a plurality of dipole-type antenna patch elements to radiate beam patterns at operating frequencies in multiple frequency bands, as shown in FIG.

[0005] Such a multi-band antenna device forms an antenna array in which crossed dipole antenna patch elements for high and low bandwidths (LB antenna: Low Band antenna, HB antenna: High Band antenna) are alternately arranged on a reflector.

[0006] Here, it is preferable that the antenna patch elements of the HB antenna and the LB antenna (hereinafter, the antenna patch elements of the HB antenna will be abbreviated as 'HB elements' and the antenna patch elements of the LB antenna will be abbreviated as 'LB elements') are arranged on the reflector as far apart as possible so that the beam patterns formed by radiation from each patch element are radiated directly and without mutual interference.

[0007] However, since the spacing of antenna patch elements inevitably increases the overall size of the product, recently, as shown in Figure 1(b), the HB element, which has a relatively small radiating surface area, is arranged closer to the reflector, and the LB element, which has a relatively large radiating surface area, is arranged in front of the HB element, which is the radiation direction.

[0008] However, in this case, due to the physical structural area of ​​the LB element arranged relatively forward, the beam pattern emitted by at least the HB element is partially overlapped, which causes the radiation pattern to be distorted due to interference from the LB element, resulting in a problem of degraded directivity. Summary of the Invention technical challenges

[0009] The present invention has been devised to solve the above technical problems, and its object is to provide an antenna device that can minimize interference of radiation beams between antenna patch panels that are arranged to cover multiple frequency bands.

[0010] Another object of the present invention is to provide an antenna device that can maximize beamforming characteristics by artificially minimizing, through a radio wave transparent shape portion, frequencies in the high frequency band (high band or middle band) radiated in the radiation direction that interfere with the low frequency band (low band) antenna patch panel.

[0011] The problems to be solved by the present invention are not limited to those mentioned above, and other problems not mentioned will be clearly understood by those skilled in the art from the following description.

[0012] An antenna device according to one embodiment of the present invention includes a first antenna patch panel that radiates an operating frequency of a first frequency band and at least one second antenna patch panel that radiates an operating frequency higher than the first frequency band, and the first antenna patch panel is provided with a frequency selective transmission pattern unit for transmitting a beam of the operating frequency radiated from the second antenna patch panel (hereinafter referred to as a 'middle beam'), and the frequency selective transmission pattern unit is provided in the form of a conductive pattern in a portion of the first antenna patch panel that is fully or at least partially overlapped with the radiation direction of the middle beam of the second antenna patch panel.

[0013] In addition, an antenna device according to an embodiment of the present invention includes a first antenna patch panel radiating an operating frequency of a first frequency band, at least one second antenna patch panel radiating an operating frequency higher than the first frequency band, and at least one third antenna patch panel radiating an operating frequency higher than the second frequency band, wherein the first antenna patch panel is provided with at least one frequency selective transmission pattern unit for transmitting at least one of a beam of the operating frequency radiated from the second antenna patch panel (hereinafter referred to as a 'middle beam') and a beam of the operating frequency radiated from the third antenna patch panel (hereinafter referred to as a 'high beam'), and the at least one frequency selective transmission pattern unit is provided in the form of a conductive pattern in a portion of the first antenna patch panel that is fully or at least partially overlapped with the radiation direction of the middle beam of the second antenna patch panel or the high beam of the third antenna patch panel.

[0014] Here, a portion of the frequency selective transmission pattern portion may be provided in the form of at least one radio wave transmission shape portion processed so that the shape from the input end to the output end of the radiation frequency is completely symmetrical with respect to an arbitrary reference line so that the operating frequency forming the middle beam of the second antenna patch panel can be transmitted.

[0015] In addition, the frequency selective transmission pattern portion is associated with the middle beam and is formed to have a square conductive frame, and includes four external radio wave transmission patterns provided on the first antenna patch panel and four internal radio wave transmission patterns associated with the middle beam and formed to have a square conductive inner surface, but are separated from the four external radio wave transmission patterns by a power break and are provided on the first antenna patch panel as inside each of the external radio wave transmission patterns, and the radio wave transmission shape portion can be provided on the external radio wave transmission patterns.

[0016] In addition, the frequency selective transmission pattern portion is associated with at least one of the middle beam and the high beam and is formed to have a square conductive frame, and is associated with four external radio wave transmission patterns provided on the first antenna patch panel and at least one of the middle beam and the high beam and is formed to have a square conductive inner surface, but is separated from the four external radio wave transmission patterns by a power interruption and includes four internal radio wave transmission patterns provided on the first antenna patch panel as inside each external radio wave transmission pattern, and the radio wave transmission shape portion can be provided on the external radio wave transmission patterns.

[0017] Also, the four external radio wave transmission patterns may be connected to be fed with power by a balun unit provided to support the first antenna patch panel.

[0018] The radio wave transmitting shape portion may be formed as a radio wave transmitting groove formed by cutting a part of the square conductive frame of the external radio wave transmitting pattern so that the part is opened inward.

[0019] In addition, the radio wave transparent shape portion may include a radio wave transparent end having at least one bent end on one side and the other side when a midpoint between one side wall and the other side wall of the radio wave transparent groove is defined as the arbitrary reference line, and a radio wave transparent connecting end extending from the radio wave transparent groove and including a frequency input end and a frequency output end connecting the left and right sides of the radio wave transparent end, respectively.

[0020] In addition, the frequency input terminal and the frequency output terminal of the radio wave transmission connecting terminal may be processed and formed so that a part of the external radio wave transmission pattern is separated in a cut shape based on the arbitrary reference line.

[0021] In addition, the radio wave transparent end may be formed to a size such that an inner end thereof can be accommodated inside the radio wave transparent groove.

[0022] In addition, the radio wave transparent end is formed to have two or more bent ends on each of one side and the other side of the arbitrary reference line, and among the bent ends of the radio wave transparent end, at least two bent ends generated from the radio wave transparent connecting end may be accommodated inside the radio wave transparent groove.

[0023] In addition, the radio wave transmission end may be designed such that its inner end deviates from the radio wave transmission groove and protrudes toward the inside of the external radio wave transmission pattern, but the protrusion length from the boundary of the radio wave transmission groove does not exceed the depth of the radio wave transmission groove.

[0024] The radio wave transparent shape portion may be formed in two stages such that the radio wave transparent connecting end and the radio wave transparent end are further added to the inner end of the radio wave transparent end.

[0025] In addition, the radio wave transparent shape portion includes a middle beam radio wave transparent portion associated with the radio wave transmission of the middle beam and a high beam radio wave transparent portion associated with the radio wave transmission of the high beam, and the length of the inner end of the middle beam radio wave transparent portion may be formed to be longer than the length of the inner end of the high beam radio wave transparent portion.

[0026] The middle beam radio wave transmitting portion and the high beam radio wave transmitting portion may be formed at the same time and spaced apart from each other on the same side of the square conductive frame. [Effects of the Invention]

[0027] According to the antenna device according to the embodiment of the present invention, the following various effects can be achieved.

[0028] First, by improving the interference phenomenon caused by the overlap of beam patterns emitted at the operating frequency of a relatively high frequency band, it is possible to aggregate the arrangement of multiple antenna patch panels that are equipped to cover multiple frequency bands, which has the effect of easily reducing the overall size of the product.

[0029] Secondly, by passing the middle and high frequency bands through the antenna patch panel that forms a beam pattern at the operating frequency of the low frequency band, it is possible to form a good beam pattern (beamforming) as desired by the designer, which has the effect of improving signal quality. [Brief explanation of the drawings]

[0030] [Figure 1] 1A and 1B are a plan view and a perspective view, respectively, showing an example of an arrangement of antenna patch panels in a configuration of a multiband antenna device according to conventional technology. [Figure 2] 1 is a perspective view showing an antenna board assembly in an antenna device according to an embodiment of the present invention; [Figure 3] FIG. 3 is a plan view of FIG. 2. [Figure 4] FIG. 3 is a front view of FIG. 2. [Figure 5] FIG. 3 is a perspective view showing a first antenna patch panel in the configuration of FIG. 2. [Figure 6] FIG. 6 is an exploded perspective view of FIG. 5. [Figure 7] FIG. 6 is a front view of FIG. 5. [Figure 8a]FIG. 7 is an exploded perspective view of one side of the balun unit in the configuration of FIG. 6. [Figure 8b] 7 is an exploded perspective view of the other side of the balun section in the configuration of FIG. 6. FIG. [Figure 9] 6 is a plan view showing a radio wave transmitting portion in the configuration of FIG. 5. FIG. [Figure 10] FIG. 10 is a frequency characteristic diagram showing the transmission band according to FIG. [Figure 11] 10A to 10C are plan views showing first to third modified examples of the radio wave transparent portion of FIG. 9. [Figure 12a] 3A to 3D are layout diagrams of first to third antenna patch panels according to an embodiment of the present invention, depending on whether or not a radio wave transparent shape portion is present. [Figure 12b] 12b is a beamforming diagram reflecting the result values ​​of the beam pattern (beamforming) depending on whether or not the radio wave transparent shape portion of FIG. 12a exists. Best Mode for Carrying Out the Invention

[0031] Hereinafter, an antenna device according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

[0032] When assigning reference numerals to components in each drawing, care should be taken to assign the same numerals to identical components even when they are displayed in different drawings. Furthermore, when describing embodiments of the present invention, if a detailed description of related known structures or functions is deemed to hinder understanding of the embodiments of the present invention, the detailed description will be omitted.

[0033] When describing components of an embodiment of the present invention, terms such as "first," "second," "A," "B," "(a)," and "(b)" may be used. These terms are merely used to distinguish the component from other components and do not limit the nature, order, or sequence of the components. Furthermore, unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by a person of ordinary skill in the art to which the present invention pertains. Terms defined in commonly used dictionaries should be interpreted as meanings consistent with the context of the relevant art, and should not be interpreted as idealized or overly formal unless expressly defined in this application.

[0034] FIG. 2 is a perspective view showing an antenna board assembly in the configuration of an antenna device according to an embodiment of the present invention, FIG. 3 is a plan view of FIG. 2, and FIG. 4 is a front view of FIG.

[0035] The antenna device according to an embodiment of the present invention may be an antenna device incorporating MIMO (Multiple Input Multiple Output) technology.

[0036] MIMO technology dramatically increases data transmission capacity by using multiple array antenna elements. It is a spatial multiplexing technique in which the transmitter transmits different data through each transmitting antenna, and the receiver separates the transmitted data through appropriate signal processing.

[0037] Therefore, by simultaneously increasing the number of transmitting and receiving antennas, the channel capacity increases, allowing more data to be transmitted. For example, if the number of antennas (the number of antenna patch panels, described later) is increased to 10, approximately 10 times the channel capacity can be secured using the same frequency band compared to a single antenna system.

[0038] In particular, the antenna device can arrange TRx modules (not shown) that perform transmitter and receiver functions in a V (Vertical)-H (Horizontal) configuration, and arrange a number of antenna patch panels electrically connected to each TRx module.

[0039] Here, in a MIMO antenna device for mobile communications, multiple antenna patch panels are generally designed with multiple dual-polarized antenna module arrays to reduce the effects of fading due to multipath and to perform polarization diversity functions.

[0040] More specifically, an antenna device according to one embodiment of the present invention may include an antenna housing portion (not shown) that forms the left, right, and rear exteriors of the antenna device, and a radome panel (not shown) that forms the front exterior of the antenna device, is provided to shield the open front surface of the antenna housing portion, and protects internal components (e.g., including an RF filter and an antenna board portion) provided in the internal space of the antenna housing portion from the outside.

[0041] Here, the functions and detailed features of the antenna housing and the radome panel are not particularly relevant to the technical features of the embodiment of the present invention, and therefore a detailed description thereof will be omitted.

[0042] Meanwhile, an antenna device according to one embodiment of the present invention may be designed and arranged with multiple antenna patch panels of a single band type that radiates operating frequencies in the same frequency band, but as shown in Figures 2 to 4, it may include antenna patch panels (10, 20, 30) of various specifications to cover multiple frequency bands (multi-bands).

[0043] That is, referring to FIG. 2, a reflector (5) that reflects the radiation frequency forward, which is the radiation direction, is provided on the front surface of the antenna board part, and the front surface of the reflector (5) may include a first antenna patch panel (10) that radiates an operating frequency of a first frequency band, at least one second antenna patch panel (20) that radiates an operating frequency higher than the first frequency band, and at least one third antenna patch panel (30) that radiates an operating frequency higher than the second frequency band.

[0044] Here, the first frequency band is a low band that emits frequencies defined as operating frequencies between 600 MHz and 800 MHz to form a low frequency band low beam pattern (beamforming) (10B, hereinafter abbreviated as 'low beam'), the second frequency band is a middle band that emits frequencies defined as operating frequencies between 1.7 GHz and 2.4 GHz to form a middle frequency band middle beam pattern (beamforming) (20B, hereinafter abbreviated as 'middle beam'), and the third frequency band is a high band that emits frequencies defined as operating frequencies between 3.4 GHz and 3.7 GHz to form a high frequency band high beam pattern (beamforming) (30B, hereinafter abbreviated as 'high beam').

[0045] However, it should be understood that each operating frequency range band is relative, and in one embodiment of the present invention, at least three different specification antenna patch panels (10, 20, 30) are provided to cover different frequency bands.

[0046] On the other hand, the first antenna patch panel (10), the second antenna patch panel (20) and the third antenna patch panel (30) may be adopted as a dipole type among various types of antenna element specifications.

[0047] In particular, the first antenna patch panel (10), the second antenna patch panel (20), and the third antenna patch panel (30) are adopted as polarized antennas that can generate at least one of dual polarizations, and are formed, for example, in a square or rectangular shape, and can generate +45 polarization by feeding power from one corner to the other corner in the diagonal direction, and can similarly radiate -45 polarization by feeding power diagonally from the remaining corner.

[0048] Figure 5 is an oblique view showing the first antenna patch panel of the configuration of Figure 2, Figure 6 is an exploded oblique view of Figure 5, Figure 7 is a front view of Figure 5, and Figures 8a and 8b are exploded oblique views of one side and the other side of the balun section of the configuration of Figure 6.

[0049] The first antenna patch panel (10), the second antenna patch panel (20) and the third antenna patch panel (30) can be supported and fixed by a balun part (50) on which power supply patterns (53a, 53b) are printed so as to maintain a predetermined distance from the front surface of the reflector (5) and to supply power to each antenna patch panel (10-30).

[0050] Here, the first antenna patch panel (10) may be positioned farthest forward from the reflector (5) and parallel to the reflector (5) by the first balun section (50A), the third antenna patch panel (30) may be positioned closest forward from the reflector (5) and parallel to the reflector (5) by the third balun section (50C), and the second antenna patch panel (20) may be positioned parallel to the reflector (5) in the space above the first antenna patch panel (10) and the third antenna patch panel (30) by the second balun section (50B).

[0051] This is because the first antenna patch panel (10), which emits the low beam (10B) in the low frequency band, has the largest size (i.e., the area of ​​the radiating surface) corresponding to the half-wavelength frequency, and therefore it is advantageous for forming the beam pattern and avoiding interference to position the third antenna patch panel (30), which has the smallest size relatively, closest to the reflector (5).

[0052] However, as shown in Figure 3, when radiating a low beam (10B) through the first antenna patch panel (10), there is no component in front of the radiation direction that can cause frequency interference, so this is not a major problem, but if the middle beam (20B) of the second antenna patch panel (20) and the high beam (30B) of the third antenna patch panel (30) are arranged to overlap with the first antenna patch panel (10) in the radiation direction, there is a risk of reflection and distortion by the metal (conductive) material that forms the radiation surface of the first antenna patch panel (10). In this case, the middle beam (20B) and high beam (30B) desired by the designer will not be radiated.

[0053] For example, the first antenna patch panel (10) contains a conductor with a length of half a wavelength, and when the middle beam emitted from the second antenna patch panel (20) is emitted from the rear side, it reflects most of the radio waves and changes the radio wave state of the second antenna patch panel (20), thereby acting as an element that inhibits the operation of the overlapping second antenna patch panel (20). This problem may also apply to the relationship between the first antenna patch panel (10) and the third antenna patch panel (30).

[0054] Meanwhile, the first antenna patch panel (10), the second antenna patch panel (20) and the third antenna patch panel (30) may differ slightly in size and detailed shape, but as shown in Figures 5 and 6, they can be supported and coupled to the reflector (5) through a balun section (50).

[0055] To explain this specifically, limiting it to the first antenna patch panel (10), the balun section (50A) includes a first balun support (51) and a second balun support (52), as shown in Figures 8a and 8b, and the first balun support (51) and the second balun support (52) are connected to each other so as to have a vertical cross section that intersects with each other in an 'X' or '+' shape, and are provided in the form of a PCB, and power supply patterns (53a, 53b) from the antenna board section to the first antenna patch panel (10) may be pattern-printed on each surface.

[0056] The first balun support (51) and the second balun support (52) may be machined to have a first coupling slit groove (56a) and a second coupling slit groove (56b) so that they are cross-coupled to each other as described above.

[0057] In addition, as shown in Figures 5 to 8, the first balun support (51) and the second balun support (52) may have a first rear fixing protrusion (54a) and a second rear fixing protrusion (54b) formed at their rear ends so as to penetrate the reflector (5) and be fixed to the antenna board portion (not shown), and may have a first front fixing protrusion (55a) and a second front fixing protrusion (55b) formed at their front ends so as to be inserted into and coupled to a first fixing slot (15a) and a second fixing slot (15b), respectively, provided in the center of the first antenna patch panel (10).

[0058] Meanwhile, the balun part (50A) supporting the first antenna patch panel (10) can mediate the connection so that power can be supplied to the four external radio wave transmission patterns (120) of the frequency selective transmission pattern part (100) described later.

[0059] Among the balun sections (50), detailed explanations of the balun section (50B) supporting the second antenna patch panel (20) and the balun section (50C) supporting the third antenna patch panel (30) will be omitted, but they have the same configuration and connection structure as the balun section (50A) supporting the first antenna patch panel (10) already described, but differ in that the lengths between each front end and rear end are formed differently based on the reflector (5).

[0060] Figure 9 is a plan view showing the radio wave transparent shape portion of the configuration of Figure 5, Figure 10 is a frequency characteristic diagram showing the transmission band according to Figure 9, Figure 11 is a plan view showing first to third modified examples of the radio wave transparent shape portion of Figure 9, Figure 12a is a layout diagram of each of the first to third antenna patch panels in accordance with one embodiment of the present invention, and Figure 12b is a beamforming diagram reflecting the results of the beam pattern (beamforming) in the part in which the radio wave transparent shape portion of Figure 12a is present.

[0061] As shown in Figures 3 and 4, an antenna device according to one embodiment of the present invention may be provided with a frequency selective transmission pattern portion (100) described below to minimize distortion due to reflection of relatively high frequency band beam patterns (middle beam (20B) and high beam (30B)) by the first antenna patch panel (10) described above.

[0062] Here, the frequency selective transmission pattern unit (100) may be provided in the form of a conductive pattern in a portion of the first antenna patch panel (10) that is completely or at least partially overlapped with the radiation direction of the middle beam (20B) and high beam (30B), which are beam patterns of a relatively high frequency band.

[0063] More specifically, the first antenna patch panel (10) may be provided with at least one frequency selective transmission pattern portion (100) for selectively transmitting at least one of the middle beam (20B) radiated from the second antenna patch panel (20) and the high beam (30B) radiated from the third antenna patch panel (30).

[0064] Here, as shown in Figures 5 to 7, the frequency selective transmission pattern unit (100) is related to the middle beam (20B) or the high beam (30B) and may include an external radio wave transmission pattern (120) described later which is provided for the transmission of the middle beam (20B) or the high beam (30B), and an internal radio wave transmission pattern (130) described later which is provided for the transmission of the middle beam (20B) or the high beam (20B).

[0065] The radiation surface of the first antenna patch panel (10) is made of a dielectric material, and four external radio wave transmission patterns (120) (see reference numerals '120a' to '120d' in Figure 4) are prepared on the radiation surface of one first antenna patch panel (10) as square conductive frames (127) of approximately the same size as the outer shape of the second antenna patch panel (20).

[0066] Here, the inner material of the conductive frame (127) of each external radio wave transmission pattern (120) is made of the same dielectric material as the material of the radiation surface of the first antenna patch panel (10) described above, and the four internal radio wave transmission patterns (130) can be combined to form a square conductive inner surface (not shown in the drawing) within one external radio wave transmission pattern (120) that is approximately the same size as the outer shape of the third antenna patch panel (30).

[0067] In this case, the internal radio wave transmission pattern (130) may be formed from a single conductive inner surface similar in size to the third antenna patch panel (30), or may be formed so that one square shape is separated into four (reference numerals '130a to 130d' ​​in FIG. 4) as shown in FIG.

[0068] The inner radio wave transmitting pattern 130 is formed to have a square conductive inner surface, but may be electrically disconnected and separated from the four outer radio wave transmitting patterns 120 .

[0069] Meanwhile, the external radio wave transmission pattern (120) of the first antenna patch panel (10), which corresponds to a part of the frequency selective transmission pattern portion (100), may be processed and formed with at least one radio wave transmission shape portion (125) in which the shape from the input end (not shown in the drawing) to the output end (not shown in the drawing) of the radiation frequency is formed completely symmetrically with respect to an arbitrary reference line (T) so that each operating frequency forming the middle beam (20B) of the second antenna patch panel (20) or the high beam (30B) of the third antenna patch panel (30) can be transmitted and interference therebetween can be minimized, as shown in Figures 7 and 9.

[0070] In other words, the radio wave transparent shape portion (125) can be limited to being provided only in the external radio wave transparent pattern (120) provided in the form of a square conductive frame (127) on the first antenna patch panel (10) among the components of the frequency selective transparent pattern portion (100).

[0071] 9, the radio wave transmitting shape portion 125 may be formed as a radio wave transmitting groove 121 formed by cutting a part of the square conductive frame 127 of the external radio wave transmitting pattern 120 so that the part is open inward. Therefore, the radio wave transmitting shape portion 125 may be provided so as not to protrude or be exposed outside the conductive frame 127 of the external radio wave transmitting pattern 120.

[0072] Meanwhile, as shown in FIG. 9, when the midpoint between one side wall and the other side wall of the radio wave transparent groove (121) is set as the arbitrary reference line (T), the radio wave transparent shape portion (125) may include a radio wave transparent end (123) having at least one bent end (129a, 129b, 129c) on one side and the other side, and radio wave transparent connecting ends (124a, 124b) extending from the radio wave transparent groove (121) and including a frequency input end and a frequency output end connecting the left and right sides of the radio wave transparent end (123), respectively.

[0073] Here, the frequency input terminal and the frequency output terminal of the radio wave transmitting connection terminals 124a and 124b are determined to be different depending on the position of the beam through which the radio wave is transmitted.

[0074] In addition, it is preferable that the frequency input terminal and the frequency output terminal of the radio wave transparent connecting terminal (124a, 124b) are processed and formed so that a part of the conductive frame (127) of the external radio wave transparent pattern (120) is separated by being cut based on the arbitrary reference line (T).

[0075] Referring to FIG. 9, the radio wave transmitting shape portion 125 is provided so that the following principle of transmitting radio waves related to frequencies is applied.

[0076] More specifically, it is assumed that a portion of the middle beam (20B) of the second antenna patch panel (20) or the high beam (30B) of the third antenna patch panel (30), which is arranged behind the first antenna patch panel (10) and has a radiation direction set forward, interferes with the first antenna patch panel (10) due to its arrangement position on the reflector (5).

[0077] In addition, in order for radio waves to be completely transmitted through the radio wave transmitting shape portion (125), the length from the frequency input end to the frequency output end must be half the wavelength (λ0) of the frequency (f0) to be transmitted, and in this case, it must be designed so that there is a 180° phase difference between the electromagnetic waves radiated from the f0 current flowing through the conductive frame (127) of the external radio wave transmitting pattern (120). However, in this case, it must be taken into consideration that the transmission performance may vary depending on the gaps of each of the bent ends (129a, 129b, 129c) mentioned above.

[0078] This can be achieved by applying the phase delay principle according to the following formula:

[0079]

number

[0080] When the above-mentioned phase delay principle is specifically applied, as shown in FIG. 9, the middle beam (20B) or high beam (30B) generated in the first antenna patch panel (10) induces a 180° phase difference during the process of being input through the frequency input terminal and output through the frequency output terminal.

[0081] In other words, the amplitude values ​​of the current in the direction of the solid arrow and the current in the direction of the dotted arrow in Figure 9 are made the same, and the design is such that there is a 180° phase difference (solid arrow current amplitude 1, phase +90°, dotted arrow current amplitude 1, phase -90°).

[0082] When the middle beam (20B) or high beam (30B) is input through the frequency input terminal of the radio wave transparent portion (125) designed in this way, the phase difference is 180° until it is output through the frequency output terminal, thereby minimizing interference (distortion) due to reflection and allowing radiation to be performed in the optimal beam shape (beamforming) required by the designer.

[0083] For example, as shown in FIG. 10, when the frequency band to be transmitted is the high frequency band of 3.4 GHz-3.7 GHz (high beam (30B)), the S-parameter is a scattering parameter and is defined as the energy returned by resistance, S11 (thin line) is the energy value that returns to port 1 after energy leaves port 1, and S12 (thick line) is the energy value that returns to port 1 after energy leaves port 2. If the S11 value, which is the energy value that is substantially canceled out, is measured at less than -10 dB in the frequency band to be transmitted, the frequency characteristics that can realize the beam pattern (beamforming) desired by the designer in the corresponding band can be confirmed.

[0084] Such a radio wave transmitting shape portion 125 can be realized in a first embodiment 125A as shown in FIG. 11(a).

[0085] The radio wave transmitting shape portion (125A) according to the first embodiment has a technical gist that the inner end of the radio wave transmitting end (123) is formed to a size that allows it to be entirely accommodated inside the radio wave transmitting groove (121).

[0086] This is because, when the allowable transmission performance is guaranteed by the gaps between the radio wave transparent connecting ends (124a, 124b) and the bent ends (129a, 129b, 129c) formed at the radio wave transparent end (123), it is most desirable to design the radio wave transparent end (123) so that it does not protrude into the inner end (120I) of the conductive frame (127) as much as possible.

[0087] However, the inner end of the radio wave transmitting end (123) does not necessarily have to be entirely contained within the radio wave transmitting groove (121), and as shown in Figure 9, it may be formed to protrude by a predetermined length (D1) based on the inner end (120I) of the conductive frame (127).

[0088] In this case, the radio wave transparent shape portion (125) is formed to have two or more folded ends (129a, 129b, 129c) on each side of the arbitrary reference line (T), but it may be designed so that only at least two folded ends (129a, 129b) generated from the radio wave transparent connecting ends (124a, 124b) of the folded ends of the radio wave transparent end (123) are accommodated inside the radio wave transparent groove (121).

[0089] Here, the radio wave transmitting end (123) has its inner end outside the radio wave transmitting groove (121) and is formed to protrude inward based on the inner end (120I) of the conductive frame (127) of the external radio wave transmitting pattern (120), but it is desirable to design it so that the protruding length from the boundary of the radio wave transmitting groove (121) (i.e., the inner end (120I) of the conductive frame (127)) does not exceed the depth of the radio wave transmitting groove (121).

[0090] Also, the radio wave transmitting shape portion 125 can be embodied in a second embodiment 125B as shown in FIG. 11(b).

[0091] As shown in FIG. 11(b), the radio wave transparent shape portion (125B) according to the second embodiment can be formed in two stages (see reference symbols '125a' and '125b' in FIG. 11(b)) so that the above-mentioned radio wave transparent connecting end (124) and radio wave transparent end (123) are further added to the inner end of the radio wave transparent end (123).

[0092] In this case, among the additionally formed portions of the second stage (125b), the configuration corresponding to the radio wave transparent connecting ends (124a, 124b) of the first stage (125a) can be defined as additional connecting ends (124a', 124b'), and among the additionally formed portions of the second stage (125b), the configuration corresponding to the radio wave transparent end (123) of the first stage (125a) can be defined as additional radio wave transparent end (123a).

[0093] As described above, the protrusion of the radio wave transparent shape portion (125A) into the inside of the conductive frame (127) may affect the implementation of the beam pattern (beam forming). However, if it is necessary to secure additional length of the transmission line depending on the frequency band to be transmitted, additional connecting ends (124a', 124b') and additional radio wave transparent ends (123a) can be additionally formed as in the radio wave transparent shape portion (125B) according to the second embodiment.

[0094] In this case, the inner end of the radio wave transmitting end (123) of the first stage (125a) may be formed to protrude a predetermined length (D1) from the inner end (120I) of the conductive frame (127), and the inner end of the additional radio wave transmitting end (123a) of the second stage (125b) may be formed to protrude a length (D2) further than D1 from the inner end of the conductive frame (127).

[0095] Meanwhile, the radio wave transmitting shape portion 125 can be realized in a third embodiment 125C as shown in FIG. 11(c).

[0096] As shown in (c) of Figure 11, the radio wave transparent shape portion (125C) according to the third embodiment includes a middle beam radio wave transparent portion (125MB) related to the radio wave transmission of the middle beam (20B) and a high beam radio wave transparent portion (125HB) related to the radio wave transmission of the high beam (30B), and the length of the inner end (123M) of the middle beam radio wave transparent portion (125MB) may be formed longer than the length of the inner end (123H) of the high beam radio wave transparent portion (125HB).

[0097] That is, in the third embodiment, in preparation for the case where radio waves of two or more frequency bands of radiation beams (e.g., middle beam (20B) and high beam (30B)) are transmitted simultaneously through one first antenna patch panel (10), two radio wave-transmitting shapes (125C) are provided in the middle beam radio wave-transmitting groove (121M) and the high beam radio wave-transmitting groove (121H) formed respectively in the conductive frame (127) so as to correspond to the transmission line lengths required for the transmission of radio waves according to each frequency bandwidth.

[0098] The difference in beamforming behavior between when the external radio wave transmission pattern (120) does not have a radio wave transmission shape portion (125) (see (a) of Figure 12a) and when it does have one (see (b) of Figure 12a) is as follows.

[0099] Referring to Figure 12b, in the case of a single band where multi-band is not applied (see dashed double-dashed line), there is almost no resonance effect on the radiation beam, so the beam pattern (beamforming) required by the designer can be realized. However, in the configuration of the antenna device (1) according to one embodiment of the present invention, if only the frequency selective transmission pattern portion (100) is formed and the radio wave transparent shape portion (125) is not applied (see dotted line), severe distortion due to resonance at the radiation point can occur. However, in the configuration of the antenna device (1) according to one embodiment of the present invention, if the radio wave transparent shape portion (125) is applied (see solid line), radio wave transmission actively occurs, so it can be confirmed that a beam pattern (beamforming) within an acceptable interference range can be realized.

[0100] As described above, the antenna device according to one embodiment of the present invention can minimize distortion of the multi-band radiation beam pattern through the provision of the frequency selective transmission pattern portion (100) and the radio wave transmission shape portion (125) among its detailed components, thereby providing the advantages of facilitating the layout design of each antenna patch panel (10, 20, 30) as well as preventing an increase in product size and improving signal quality.

[0101] Although an antenna device according to an embodiment of the present invention has been described in detail above with reference to the accompanying drawings, it should be understood that the present invention is not limited to the above embodiment and that various modifications and variations within the scope of the present invention may be made by those skilled in the art. [Industrial Applicability]

[0102] The present invention provides an antenna device that can maximize beamforming characteristics by minimizing interference of radiation beams between antenna patch panels that are installed to cover multiple frequency bands, and artificially minimizing frequencies in the high frequency band (high band or middle band) radiated in the radiation direction that interfere with the antenna patch panel in the low frequency band (low band) through a radio wave transparent shape portion. [Explanation of symbols]

[0103] 5: Reflector 10: First antenna patch panel 10B: Low beam 20: Second antenna patch panel 20B: Middle beam 30: Third antenna patch panel 30B: High beam 50: Balun section 51: 1st balance support 52: 2nd balance support 100: Frequency selective transmission pattern section 120: External radio wave transmission pattern 121: Radio wave transmission groove 123: Radio wave transmission end 124a, 124b: Radio wave transmission connection end 125: Radio wave transmission shape part 127: Conductive frame 130: Internal radio wave transmission pattern

Claims

1. a first antenna patch panel radiating an operating frequency in the first frequency band; and at least one second antenna patch panel radiating an operating frequency greater than the first frequency band; the first antenna patch panel is provided with a frequency selective transmission pattern unit for transmitting a beam of an operating frequency (hereinafter referred to as a 'middle beam') radiated from the second antenna patch panel; An antenna device, wherein the frequency selective transmission pattern portion is provided in the form of a conductive pattern in a portion of the first antenna patch panel that is completely or at least partially overlapped with the radiation direction of the middle beam of the second antenna patch panel.

2. a first antenna patch panel radiating an operating frequency in the first frequency band; at least one second antenna patch panel radiating an operating frequency greater than the first frequency band; and at least one third antenna patch panel radiating an operating frequency greater than the second frequency band; the first antenna patch panel includes at least one frequency selective transmission pattern unit for transmitting at least one of a beam of an operating frequency radiated from the second antenna patch panel (hereinafter referred to as a 'middle beam') and a beam of an operating frequency radiated from the third antenna patch panel (hereinafter referred to as a 'high beam'); An antenna device, wherein the at least one frequency selective transmission pattern portion is provided in the form of a conductive pattern in a portion of the first antenna patch panel that is completely or at least partially overlapped with the radiation direction of the middle beam of the second antenna patch panel or the high beam of the third antenna patch panel.

3. The antenna device of claim 1, wherein a portion of the frequency selective transmission pattern portion is provided in the form of at least one radio wave transmission shape portion processed so that the shape from the input end to the output end of the radiation frequency is formed completely symmetrically based on an arbitrary reference line so that the operating frequency that forms the middle beam of the second antenna patch panel is transmitted.

4. The antenna device of claim 2, wherein a portion of the frequency selective transmission pattern portion is provided in the form of at least one radio wave transmission shape portion processed so that the shape from the input end to the output end of the radiation frequency is formed completely symmetrically with respect to an arbitrary reference line so that each operating frequency forming the middle beam of the second antenna patch panel or the high beam of the third antenna patch panel is transmitted.

5. The frequency selective transmission pattern portion is Four external radio wave transmission patterns associated with the middle beam and formed with square conductive frames, the patterns being provided on the first antenna patch panel; and four inner radio wave transmission patterns each having a square conductive inner surface associated with the middle beam, spaced apart from the four outer radio wave transmission patterns so as to be electrically disconnected, and provided on the first antenna patch panel as an inner surface of each of the outer radio wave transmission patterns; The antenna device according to claim 3 , wherein the radio wave transmitting portion is provided on the external radio wave transmitting pattern.

6. The frequency selective transmission pattern portion is Four external radio wave transmission patterns associated with at least one of the middle beam and the high beam and formed to have a square conductive frame and provided on the first antenna patch panel; and four internal radio wave transmission patterns associated with at least one of the middle beam and the high beam, each having a square conductive inner surface, and spaced apart from the four external radio wave transmission patterns so as to be electrically disconnected, the internal radio wave transmission patterns being provided on the first antenna patch panel as internal portions of the respective external radio wave transmission patterns; The antenna device according to claim 3 , wherein the radio wave transmitting portion is provided on the external radio wave transmitting pattern.

7. 7. The antenna device according to claim 5, wherein the four external radio wave transmission patterns are connected to be fed with power by a balun unit provided to support the first antenna patch panel.

8. 7. The antenna device according to claim 5, wherein the radio wave transmitting portion is formed as a radio wave transmitting groove formed by cutting a part of the square conductive frame of the external radio wave transmitting pattern so as to open inward.

9. The radio wave transparent portion is a radio wave transmitting end having at least one bent end on one side and the other side when the midpoint between one side wall and the other side wall of the radio wave transmitting groove is taken as the arbitrary reference line; and 7. The antenna device according to claim 5, further comprising: a radio wave transparent connecting end extending from the radio wave transparent groove and including a frequency input end and a frequency output end connecting the left and right ends of the radio wave transparent end, respectively.

10. The antenna device according to claim 9 , wherein the frequency input terminal and the frequency output terminal of the radio wave transmitting connecting terminal are processed and formed so that a part of the external radio wave transmitting pattern is separated in a form of being cut based on the arbitrary reference line.

11. The antenna device according to claim 9 , wherein the radio wave transmitting end is formed to have a size such that an inner end thereof is entirely housed within the radio wave transmitting groove.

12. The radio wave transparent end is formed to have two or more bent ends on one side and the other side of the arbitrary reference line, The antenna device according to claim 9 , wherein at least two of the bent ends of the radio wave transparent end, which are formed from the radio wave transparent connecting end, are all accommodated inside the radio wave transparent groove.

13. The antenna device according to claim 9, wherein the radio wave transmitting end is formed so that its inner end deviates from the radio wave transmitting groove and protrudes toward the inside of the external radio wave transmitting pattern, but the protruding length from the boundary of the radio wave transmitting groove does not exceed the depth of the radio wave transmitting groove.

14. The antenna device according to claim 13 , wherein the radio wave transparent portion is formed in two stages such that the radio wave transparent connecting end and the radio wave transparent end are further added to an inner end of the radio wave transparent end.

15. The radio wave transparent portion is a middle beam radio wave transmission portion associated with the middle beam radio wave transmission; and a high beam radio wave transmission portion associated with the high beam radio wave transmission; The antenna device according to claim 9, wherein the length of the inner end of the middle beam radio wave transmitting portion is longer than the length of the inner end of the high beam radio wave transmitting portion.

16. The antenna device according to claim 15 , wherein the middle beam radio wave transmitting portion and the high beam radio wave transmitting portion are formed on the same side of the square conductive frame so as to be spaced apart from each other.

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