Antenna module and communication device equipped with same

Abstract

An antenna module (100) is provided with a planar radiation element (121), a ground electrode (GND) disposed facing the radiation element (121), a feed line (141), and a strip-shaped planar electrode (151). The feed line (141) transmits a high frequency signal to a feeding point (SP1) of the radiation element (121). One end of the planar electrode (151) is connected to the radiation element (121) and is electrically coupled to the feed line (141). The planar electrode (151) constitutes a filter circuit together with the radiation element (121).

Description

Antenna module and communication device equipped with same

[0001] The present disclosure relates to an antenna module and a communication device equipped with the same, and more particularly to a technique for improving the antenna characteristics of the antenna module.

[0002] International Publication No. WO 2023 / 214473 (Patent Document 1) discloses a dual-band stacked antenna module having two flat radiating elements with their principal surfaces facing each other, in which a band-stop filter is disposed in a feed line that transmits high-frequency signals to the radiating elements. The band-stop filter is disposed parallel to a portion of the feed line and is composed of a strip-shaped line with one end connected to the feed line. With this configuration, the line, together with a ground electrode, forms a microstrip line resonator.

[0003] By providing such a band-stop filter, signals in a specific frequency band can be blocked from the radiating element, thereby improving the attenuation characteristics and the isolation between the two radiating elements.

[0004] WO 2023 / 214473

[0005] The bandstop filter in WO 2023 / 214473 (Patent Document 1) is a line that, together with the ground electrode, constitutes a microstrip line, and therefore needs to be placed on a dielectric layer close to the ground electrode. In this case, because the feed wiring has a line between the connection portion of the bandstop filter and the radiating element, spurious waves may be coupled in this portion, and there is a possibility that the desired attenuation characteristics may not be obtained for signals in the frequency band to be attenuated.

[0006] The present disclosure has been made to solve the above-mentioned problems, and its purpose is to improve the attenuation characteristics of signals in a frequency band to be attenuated in an antenna module having a flat-plate-shaped radiating element.

[0007] The antenna module according to the present disclosure includes a flat-plate-shaped radiating element, a ground electrode arranged opposite the radiating element, a first feed wiring, and a strip-shaped first plate electrode. The first feed wiring transmits a high-frequency signal in a first frequency band to a first feed point of the radiating element. One end of the first plate electrode is connected to the radiating element. The radiating element is electrically coupled to the first feed wiring. The first plate electrode, together with the radiating element, forms a filter circuit.

[0008] In the antenna module of the present disclosure, a filter circuit (bandstop filter) is formed by a first plate electrode and a flat-plate radiating element. One end of the first plate electrode constituting this filter circuit is connected to the radiating element, and the target signal is blocked in the immediate vicinity of the radiating element. This configuration suppresses coupling of the signal to be attenuated to the power supply wiring between the filter circuit and the radiating element. Therefore, in an antenna module having a flat-plate radiating element, the attenuation characteristics of signals in the frequency band to be attenuated can be improved.

[0009] FIG. 1 is a block diagram of a communication device to which an antenna module according to a first embodiment is applied. FIG. 2 is a perspective view of the internal structure of the antenna module of FIG. 1. FIG. 3 is a plan view of the antenna module of FIG. 2. FIG. 4 is a first diagram for explaining antenna characteristics of the antenna module of the first embodiment. FIG. 5 is a second diagram for explaining antenna characteristics of the antenna module of the first embodiment. FIG. 6 is a third diagram for explaining antenna characteristics of the antenna module of the first embodiment. FIG. 7 is a partial perspective view of the internal structure of the antenna module of a first modified example. FIG. 8 is a perspective view of the internal structure of the antenna module of a second modified example. FIG. 9 is a side perspective view of the antenna module of a third modified example. FIG. 10 is a perspective view of the internal structure of the antenna module of a fourth modified example. FIG. 11 is a side perspective view of the antenna module according to the second embodiment. FIG. 12 is a side perspective view of the antenna module of a fifth modified example. FIG. 13 is a side perspective view of the antenna module of a sixth modified example.

[0010] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings. In the drawings, the same or corresponding parts are designated by the same reference numerals, and description thereof will not be repeated.

[0011] [First Embodiment] (Basic Configuration of Communication Device) Fig. 1 is a block diagram of a communication device 10 to which an antenna module 100 according to a first embodiment is applied. The communication device 10 is, for example, a mobile terminal such as a mobile phone, smartphone, or tablet, or a personal computer with a communication function. An example of the frequency band of radio waves used in the antenna module 100 according to the first embodiment is millimeter-wave radio waves with center frequencies of 28 GHz and 39 GHz, but radio waves in other frequency bands are also applicable.

[0012] 1 , a communication device 10 includes an antenna module 100 and a BBIC 200 that constitutes a baseband signal processing circuit. The antenna module 100 includes an RFIC 110 and an antenna device 120. The RFIC 110 is a power supply circuit that supplies a high-frequency signal to the antenna device 120. The communication device 10 upconverts a signal transmitted from the BBIC 200 to the antenna module 100 into a high-frequency signal and radiates the high-frequency signal from the antenna device 120, and downconverts a high-frequency signal received by the antenna device 120 and processes the signal in the BBIC 200.

[0013] The antenna device 120 includes a dielectric substrate 130 on which a plurality of radiating elements are arranged. FIG. 1 shows an example in which four radiating elements 121A to 121D (hereinafter collectively referred to as "radiating elements 121") are arranged on the dielectric substrate 130, but the number of radiating elements arranged on the dielectric substrate 130 is not limited to this, and it is sufficient that at least one element is arranged. Also, FIG. 1 shows an example in which the radiating elements 121 are arranged in a one-dimensional array on the dielectric substrate 130, but the radiating elements 121 may be arranged in a two-dimensional array. Alternatively, a configuration in which one radiating element is arranged on the dielectric substrate 130 may be used. In the first embodiment, the radiating element 121 is described as a patch antenna having a substantially square plate shape, but the shape of the radiating element 121 may be a circle, an ellipse, or another polygon such as a hexagon.

[0014] In the antenna module 100 of the first embodiment, high-frequency signals in two different frequency bands (first frequency band and second frequency band) are supplied to each radiating element. That is, the antenna module 100 is a dual-band type antenna module that can radiate radio waves in two different frequency bands using a single radiating element.

[0015] The RFIC 110 includes switches 111A to 111H, 113A to 113H, 117A, and 117B, power amplifiers 112AT to 112HT, low-noise amplifiers 112AR to 112HR, attenuators 114A to 114H, phase shifters 115A to 115H, signal combiners / dividers 116A and 116B, mixers 118A and 118B, and amplifier circuits 119A and 119B. Of these, the configuration of switches 111A to 111D, 113A to 113D, and 117A, power amplifiers 112AT to 112DT, low-noise amplifiers 112AR to 112DR, attenuators 114A to 114D, phase shifters 115A to 115D, signal combiner / divider 116A, mixer 118A, and amplifier circuit 119A constitutes a circuit for high-frequency signals for the first frequency band. Also, the configuration of switches 111E to 111H, 113E to 113H, and 117B, power amplifiers 112ET to 112HT, low-noise amplifiers 112ER to 112HR, attenuators 114E to 114H, phase shifters 115E to 115H, signal combiner / divider 116B, mixer 118B, and amplifier circuit 119B constitutes a circuit for high-frequency signals for the second frequency band.

[0016] More specifically, high frequency signals are transmitted to radiating element 121A from switches 111A and 111E. High frequency signals are transmitted to radiating element 121B from switches 111B and 111F. High frequency signals are transmitted to radiating element 121C from switches 111C and 111G. High frequency signals are transmitted to radiating element 121D from switches 111D and 111H.

[0017] When transmitting a high frequency signal, the switches 111A to 111H and 113A to 113H are switched to the power amplifiers 112AT to 112HT, and the switches 117A and 117B are connected to the transmission amplifiers of the amplifier circuits 119A and 119B. When receiving a high frequency signal, the switches 111A to 111H and 113A to 113H are switched to the low noise amplifiers 112AR to 112HR, and the switches 117A and 117B are connected to the reception amplifiers of the amplifier circuits 119A and 119B.

[0018] The signal transmitted from the BBIC 200 is amplified by amplifier circuits 119A and 119B and up-converted by mixers 118A and 118B. The up-converted high-frequency transmission signal is split into four by signal combiners / dividers 116A and 116B, passes through the corresponding signal paths, and is fed to the radiating element 121. By individually adjusting the phase shift of the phase shifters 115A to 115H arranged on each signal path, the directivity of the radio waves output from the radiating element of each board can be adjusted. In addition, attenuators 114A to 114D adjust the strength of the transmission signal.

[0019] When receiving radio waves, received signals, which are high-frequency signals received by each radiating element, are transmitted to the RFIC 110 and combined in the signal combiners / dividers 116A and 116B via corresponding signal paths. The combined received signals are down-converted by the mixers 118A and 118B, and further amplified by the amplifier circuits 119A and 119B before being transmitted to the BBIC 200.

[0020] The RFIC 110 is formed as, for example, a one-chip integrated circuit component including the above circuit configuration. Alternatively, the devices (switches, power amplifiers, low-noise amplifiers, attenuators, and phase shifters) corresponding to the respective radiating elements in the RFIC 110 may be formed as one-chip integrated circuit components for each corresponding radiating element.

[0021] (Structure of Antenna Module) Next, the configuration of the antenna module 100 according to the first embodiment will be described in detail with reference to Figures 2 to 4. Figure 2 is a perspective view of the internal structure of the antenna module 100. Figure 3 is a side perspective view of the antenna module 100. Figure 4 is a plan view of the antenna module 100. Note that, for ease of explanation, the dielectric of the dielectric substrate 130 is omitted in Figure 2. Also, in Figures 2 to 4, an example will be described in which one radiating element 121 is arranged on the dielectric substrate 130.

[0022] 2 to 4, the antenna module 100 includes, in addition to the RFIC 110, the radiating element 121, and the dielectric substrate 130, feed lines 141 and 142, plate electrodes 151 and 152, a via 155, and a ground electrode GND.

[0023] The dielectric substrate 130 is a substrate having a substantially rectangular main surface. In the following description, the normal direction to the main surface of the dielectric substrate 130 is referred to as the Z-axis direction. The long side direction of the main surface of the dielectric substrate 130 is referred to as the X-axis direction, and the short side direction is referred to as the Y-axis direction. In each drawing, the positive direction of the Z-axis may also be referred to as the upper side, and the negative direction of the Z-axis may also be referred to as the lower side.

[0024] The dielectric substrate 130 may be, for example, a low temperature co-fired ceramics (LTCC) multilayer substrate, a multilayer resin substrate formed by laminating multiple resin layers made of resins such as epoxy or polyimide, a multilayer resin substrate formed by laminating multiple resin layers made of liquid crystal polymer (LCP) having a lower dielectric constant, a multilayer resin substrate formed by laminating multiple resin layers made of fluorine-based resin, a multilayer resin substrate formed by laminating multiple resin layers made of PET (Polyethylene Terephthalate), or a ceramic multilayer substrate other than LTCC. Note that the dielectric substrate 130 does not necessarily have a multilayer structure and may be a single-layer substrate.

[0025] The radiating element 121 is disposed on an internal dielectric layer close to a principal surface 131 of the dielectric substrate 130 in the positive direction of the Z axis. The radiating element 121 may be disposed so as to be exposed to the principal surface 131. The RFIC 110 is mounted on the principal surface 132 of the dielectric substrate 130 by solder bumps 160.

[0026] 3, in the dielectric substrate 130, a ground electrode GND is arranged over the entire surface of the dielectric layer between the radiating element 121 and a principal surface 132 of the dielectric substrate 130 in the negative direction of the Z axis, so as to face the principal surface of the radiating element 121. The ground electrode GND and the radiating element 121 form a microstrip antenna.

[0027] The power supply lines 141 and 142 transmit high-frequency signals from the RFIC 110 to the radiating element 121. In the antenna module 100, the power supply line 141 transmits high-frequency signals in a first frequency band from the RFIC 110 to the radiating element 121. The power supply line 142 transmits high-frequency signals in a second frequency band from the RFIC 110 to the radiating element 121.

[0028] In the first embodiment, the first frequency band is higher than the second frequency band. That is, the wavelength of the high frequency signal in the first frequency band is λ １ and the wavelength of the high frequency signal in the second frequency band is λ ２ In this case, λ １ <λ ２ For example, the first frequency band is the 39 GHz band, and the second frequency band is the 28 GHz band.

[0029] The size of the radiating element 121 is set to a size that allows it to resonate with high-frequency signals in the first frequency band and the second frequency band. When the length of one side of the radiating element 121 is L, the radiating element 121 has a length λ １ / 2<L<λ ２ The size is set to be 1 / 2.

[0030] The feed wiring 141 is connected from the RFIC 110 to the radiating element 121 via a plate electrode 151. The plate electrode 151 is a strip-shaped electrode extending in the X-axis direction. The plate electrode 151 is arranged facing the radiating element 121 on a dielectric layer located below and close to the radiating element 121. The feed wiring 141 is connected to the end of the plate electrode 151 on the negative side of the X-axis. The end of the plate electrode 151 on the positive side of the X-axis is connected to the radiating element 121 via a via 155.

[0031] The portion of plate electrode 151 to which feed wiring 141 is connected is located below and spaced apart from feed point SP1 of radiating element 121. As a result, a high-frequency signal transmitted from feed wiring 141 is transmitted to radiating element 121 by capacitive coupling between plate electrode 151 and radiating element 121. Plate electrode 151 extends from a position facing feed point SP1 toward the center of radiating element 121.

[0032] The feed point SP1 is located at a position offset in the negative direction of the X axis from the center of the radiating element 121. Therefore, when a high-frequency signal is supplied to the feed point SP1, a radio wave polarized in the X axis direction is radiated from the radiating element 121 in the positive direction of the Z axis.

[0033] The length of the plate electrode 151 in the X-axis direction is the wavelength λ of the high-frequency signal transmitted by the power supply wiring 142. ２ The electrical length is set to correspond to ¼ of the radiating element 121. By setting these dimensions, the plate electrode 151, together with the radiating element 121, constitutes a microstrip line type bandstop filter (trap filter) that removes high frequency signals in the second frequency band. This makes it possible to remove signal components in the second frequency band that are included in high frequency signals transmitted to the radiating element 121 by the feed wiring 141.

[0034] 4, the plate electrode 151 includes a first portion 1511 including a connection portion with the feed wiring 141 and a second portion 1512 including a connection portion with the radiating element 121. The line width W1 of the first portion 1511 is wider than the line width W2 of the second portion 1512 (W1>W2). In other words, the plate electrode 151 is an electrode having a step in the line width in the extension direction.

[0035] By relatively widening the line width on the power supply side to increase the equivalent capacitance and relatively narrowing the line width on the short-circuit side to increase the equivalent inductivity, a stepped impedance resonator (SIR) effect can be produced, which allows the line length of the plate electrode 151 to be shortened. Note that instead of providing a step in the line width of the plate electrode 151, the line width may be tapered.

[0036] A plate electrode 152 is connected to the end of the feed wiring 142. The plate electrode 152 is arranged below and spaced apart from the feed point SP2 of the radiating element 121 on a dielectric layer close to and below the radiating element 121. This allows the high-frequency signal transmitted from the feed wiring 142 to be transmitted to the radiating element 121 by capacitive coupling between the plate electrode 152 and the radiating element 121.

[0037] The feed point SP2 is located at a position offset in the positive direction of the X-axis from the center of the radiating element 121. Therefore, when a high-frequency signal is supplied to the feed point SP2, a radio wave polarized in the X-axis direction is radiated in the positive direction of the Z-axis from the radiating element 121. The plate electrode 152 extends from a position opposite the feed point SP2 toward the center of the radiating element 121.

[0038] In the radiating element 121, the feed point SP2 is provided at the end of a plate electrode 170 that is configured as part of the radiating element 121. The plate electrode 170 extends in the X-axis direction, with one end (the end in the negative direction of the X-axis) connected to the body of the radiating element 121 and the other end (the end in the positive direction of the X-axis) serving as the feed point SP2. A slit 175 is formed between the peripheral edge of the plate electrode 170 other than the one end and the body of the radiating element 121. The length of the plate electrode 170 in the X-axis direction is equal to the wavelength λ of the high-frequency signal transmitted by the feed wiring 141. １The electrical length is set to correspond to ¼ of the radiating element 121. By setting these dimensions, the plate electrode 170, together with the radiating element 121, constitutes a coplanar bandstop filter (trap filter) that removes high-frequency signals in the first frequency band. This makes it possible to remove signal components in the first frequency band that are included in high-frequency signals transmitted to the radiating element 121 by the feed wiring 142.

[0039] In the configuration of the antenna module 100, a filter circuit is provided in the portion of each power supply path closest to the radiating element, which makes it possible to suppress the influence of external noise on the high-frequency signal after passing through the filter circuit.

[0040] (Antenna Characteristics) Next, the antenna characteristics of the antenna module 100 will be described with reference to FIGS.

[0041] First, the change in antenna characteristics with and without a band-stop filter will be described using Fig. 5. Fig. 5 shows the change in return loss and gain when a high-frequency signal in the lower frequency band (second frequency band) is supplied.

[0042] The upper part of Fig. 5 shows the schematic structures of the antenna modules of the first embodiment and the comparative example. Note that the high-frequency power supply path is omitted in Fig. 5. In the antenna module 100 of the first embodiment, a coplanar filter circuit is provided at the power supply point SP2 of the radiating element 121. On the other hand, the radiating element 121X of the comparative example antenna module is not provided with a filter circuit.

[0043] 5 shows graphs of return loss (left) and gain (right). In each graph, solid lines LN10 and LN15 show the results for the first embodiment, and dashed lines LN11 and LN16 show the results for the comparative example.

[0044] As shown in FIG. 5, in both the first embodiment and the comparative example, the return loss is reduced in the vicinity of 28 GHz (25 to 30 GHz), which is the frequency band to be radiated, and is increased in the vicinity of 39 GHz, which is the frequency band to be attenuated.

[0045] On the other hand, in terms of gain, high gain is ensured in both frequency bands that are the target of radiation. However, in the frequency band that is the target of attenuation, the gain is reduced in the case of the first embodiment, while the gain remains high in the comparative example. That is, in the case of the antenna module 100 of the first embodiment, it can be seen that interference of high-frequency signals on the high-frequency side is suppressed in the power supply wiring 142.

[0046] Fig. 6 is a diagram showing the return loss and isolation between the feed ports when a high-frequency signal is supplied to the radiating element 121 from each feed port of the feed lines 141 and 142. In Fig. 6, the solid line LN20 shows the return loss when power is supplied from the feed line 142, which is the feed port on the low frequency side. The dashed line LN21 shows the return loss when power is supplied from the feed line 141, which is the feed port on the high frequency side. The dashed line LN22 shows the isolation between the feed lines 141 and 142.

[0047] When power is supplied from the power supply line 142 (solid line LN20), the return loss in the frequency band to be radiated (near 28 GHz) is reduced, and the return loss in the frequency band to be attenuated (near 39 GHz) is increased. Conversely, when power is supplied from the power supply line 141 (dashed line LN21), the return loss in the frequency band to be radiated (near 39 GHz) is reduced, and the return loss in the frequency band to be attenuated (near 28 GHz) is increased.

[0048] Regarding the isolation between the power supply ports (dash-dotted line LN22), it is clear that the attenuation in the target frequency band (28 GHz / 39 GHz) is large, ensuring mutual isolation.

[0049] Fig. 7 is a diagram showing the antenna gain of the antenna module 100 according to the first embodiment and an antenna module according to a comparative example that does not have a filter circuit as shown in Fig. 5. In Fig. 7, solid lines LN30 and LN31 show the results for the first embodiment, and dashed lines LN35 and LN36 show the results for the comparative example.

[0050] As shown in FIG. 7, it can be seen that the gain characteristics of the first embodiment are wider than those of the comparative example in both the low-frequency band and the high-frequency band.

[0051] As described above, the antenna module 100 of the first embodiment realizes a dual-band antenna module using a single radiating element 121 by supplying high-frequency signals in two different frequency bands to the radiating element 121 via the power supply wirings 141 and 142. Therefore, the overall size of the device can be reduced compared to a dual-band antenna module that uses two radiating elements.

[0052] Furthermore, by forming a band-stop filter using the radiating element 121 and the plate electrodes 151 and 170 in the power feeding portion from the power feeding wiring 141 and 142 to the radiating element 121, it is possible to remove signal components in one frequency band from the power feeding path of the other frequency band. In other words, it is possible to improve the attenuation characteristics of signals in the frequency band to be attenuated. Therefore, it is possible to suppress interference between the power feeding paths.

[0053] In the antenna module 100 of the first embodiment, an example has been described in which the filter circuit for the high-frequency power feed path (power feed wiring 141) is a microstrip type filter circuit and the filter circuit for the low-frequency power feed path (power feed wiring 142) is a coplanar type filter circuit, but either a microstrip type or a coplanar type filter circuit may be used as the filter circuit for each power feed path.

[0054] However, when the same type of filter circuit is used, the plate electrodes that make up the filter circuits are arranged on the same dielectric layer, which could result in physical interference between the plate electrodes depending on the target frequency band and the position of the feed point. Therefore, by configuring the two filter circuits with different types of filter circuits, interference between the plate electrodes can be prevented.

[0055] One of the "plate electrode 151" and the "plate electrode 170" in the first embodiment corresponds to the "first plate electrode" in the present disclosure, and the other corresponds to the "fourth plate electrode" in the present disclosure. One of the "power supply wiring 141" and the "power supply wiring 142" in the first embodiment corresponds to the "first power supply wiring" in the present disclosure, and the other corresponds to the "third power supply wiring" in the present disclosure. One of the "power supply point SP1" and the "power supply point SP2" in the first embodiment corresponds to the "first power supply point" in the present disclosure, and the other corresponds to the "fourth power supply point" in the present disclosure.

[0056] <Modifications> Next, modifications will be described with reference to FIGS. 8 to 11. FIG.

[0057] (Modification 1) In Modification 1, a configuration in which a shield cover is provided in a microstrip type filter device will be described.

[0058] Fig. 8 is a partial perspective view of the internal structure of the antenna module 100A of Modification 1. In Fig. 8 as well, the dielectric of the dielectric substrate 130 is omitted for ease of explanation.

[0059] 8, antenna module 100A has a configuration in which a shielding member 190 is added to the periphery of plate electrode 151 of antenna module 100 of embodiment 1. In FIG. 8, the description of elements common to antenna module 100 will not be repeated.

[0060] The shield member 190 includes a first member 191 having a flat plate shape and a second member 192 that connects the first member 191 to the radiating element 121. The first member 191 is disposed between the plate electrode 151 and the ground electrode GND and facing the plate electrode 151. When viewed in plan from the Z-axis direction, the first member 191 is disposed so as to overlap with the plate electrode 151 except for the portion of the plate electrode 151 at the power feed point SP1.

[0061] The second member 192 connects the first member 191 and the radiating element 121 at the peripheral edge of the first member 191. The second member 192 is formed of, for example, a plurality of vias.

[0062] The first member 191 and the second member 192 of the shield member 190 are formed of a conductive material such as copper, which reduces the influence of external noise on the plate electrode 151. Furthermore, when unwanted waves are generated by the current flowing through the plate electrode 151, the influence of the unwanted waves on the outside can be reduced.

[0063] (Modification 2) In Modification 2, a so-called dual-polarized type antenna module capable of radiating radio waves in two different polarization directions for each frequency band will be described.

[0064] Fig. 9 is a perspective view of the internal structure of an antenna module 100B of Modification 2. In Fig. 9 as well, the dielectric in the dielectric substrate 130 is omitted for ease of explanation.

[0065] 9, in antenna module 100B, power supply lines 143 and 144, plate electrodes 153 and 154, and a via 156 are added to the configuration of antenna module 100 of the first embodiment.

[0066] In the radiating element 121 of the antenna module 100B, a feed point SP3 is disposed at a position offset in the positive direction of the Y axis from the center of the radiating element 121, and a feed point SP4 is disposed at a position offset in the negative direction of the Y axis from the center of the radiating element 121. Similar to the feed point SP1, a high-frequency signal in a first frequency band on the high-frequency side is transmitted to the feed point SP3. Similar to the feed point SP2, a high-frequency signal in a second frequency band on the low-frequency side is transmitted to the feed point SP4.

[0067] The feed wiring 143 is connected from the RFIC 110 to the radiating element 121 via a plate electrode 153. The plate electrode 153 is a strip-shaped electrode that extends in the Y-axis direction and has the same shape as the plate electrode 151. The plate electrode 153 is arranged facing the radiating element 121 on a dielectric layer that is lower than and close to the radiating element 121. The feed wiring 143 is connected to the end of the plate electrode 153 in the positive direction of the Y-axis. The end of the plate electrode 153 in the negative direction of the Y-axis is connected to the radiating element 121 via a via 156.

[0068] The portion of plate electrode 153 to which feed wiring 143 is connected is located below and spaced apart from feed point SP3 of radiating element 121. As a result, the high-frequency signal transmitted from feed wiring 143 is transmitted to radiating element 121 by capacitive coupling between plate electrode 153 and radiating element 121. Plate electrode 153 extends from a position facing feed point SP3 toward the center of radiating element 121.

[0069] The feed point SP3 is located at a position offset in the positive direction of the Y axis from the center of the radiating element 121. Therefore, when a high-frequency signal is supplied to the feed point SP3, a radio wave polarized in the Y axis direction is radiated from the radiating element 121 in the positive direction of the Z axis.

[0070] The length of the plate electrode 153 in the Y-axis direction is the wavelength λ of the high frequency signal in the second frequency band. ２The electrical length is set to correspond to ¼ of the radiating element 121. By setting these dimensions, the plate electrode 153, together with the radiating element 121, constitutes a microstrip line type bandstop filter (trap filter) that removes high frequency signals in the second frequency band. This makes it possible to remove signal components in the second frequency band that are included in the high frequency signals transmitted to the radiating element 121 by the feed wiring 143.

[0071] A plate electrode 154 is connected to the end of the feed wiring 144. The plate electrode 154 is arranged below and spaced apart from the feed point SP4 of the radiating element 121 on a dielectric layer close to and below the radiating element 121. This allows the high-frequency signal transmitted from the feed wiring 144 to be transmitted to the radiating element 121 by capacitive coupling between the plate electrode 154 and the radiating element 121.

[0072] The feed point SP4 is located at a position offset in the negative direction of the Y axis from the center of the radiating element 121. Therefore, when a high-frequency signal is supplied to the feed point SP4, a radio wave polarized in the Y axis direction is radiated in the positive direction of the Z axis from the radiating element 121. The plate electrode 154 extends from a position opposite the feed point SP4 towards the center of the radiating element 121.

[0073] In the radiating element 121, the feed point SP4 is provided at the end of a plate electrode 171 that is configured as part of the radiating element 121. The plate electrode 171 extends in the Y-axis direction, with one end (the end in the positive direction of the Y-axis) connected to the body of the radiating element 121 and the other end (the end in the negative direction of the Y-axis) serving as the feed point SP4. A slit is formed between the peripheral edge of the plate electrode 171 other than the one end and the body of the radiating element 121. The length of the plate electrode 171 in the Y-axis direction is equal to the wavelength λ of the high-frequency signal in the first frequency band. １ The electrical length is set to correspond to ¼ of the radiating element 121. By setting these dimensions, the plate electrode 171, together with the radiating element 121, constitutes a coplanar bandstop filter (trap filter) that removes high-frequency signals in the first frequency band. This makes it possible to remove signal components in the first frequency band that are included in high-frequency signals transmitted to the radiating element 121 by the feed wiring 144.

[0074] As described above, even when a dual-band antenna module using a single radiating element 121 is configured as a dual-polarized antenna, interference between the power supply paths can be suppressed by providing a plate electrode in each power supply path that, together with the radiating element, forms a bandstop filter.

[0075] The "plate electrode 153" and the "plate electrode 171" in Modification 2 each correspond to the "second plate electrode" in the present disclosure. The "feed point SP3" and the "feed point SP4" in Modification 2 each correspond to the "second feed point" in the present disclosure. The "feed wiring 143" and the "feed wiring 144" in Modification 2 each correspond to the "second feed wiring" in the present disclosure.

[0076] (Modification 3) In Modification 3, a case will be described in which the filter circuits for the two power supply paths to the radiating element are both configured as microstrip filter circuits.

[0077] Fig. 10 is a side perspective view of an antenna module 100C of Modification 3. In the antenna module 100C, a plate electrode 161 is provided instead of the plate electrode 170 portion of the radiating element 121 in the antenna module 100 of Embodiment 1. Note that an opening is formed in the portion of the radiating element 121 corresponding to the feed point SP2, and the slit 175 in Fig. 4 is eliminated.

[0078] The feed wiring 142 passes through an opening corresponding to the feed point SP2 of the radiating element 121, and is connected to one end of the plate electrode 161 on the main surface 131 side of the radiating element 121. The feed wiring 142 is capacitively coupled to the radiating element 121 at the opening.

[0079] The plate electrode 161 is a strip-shaped electrode extending in the X-axis direction, similar to the plate electrode 151 on the side of the power supply wiring 141. The plate electrode 161 extends from the connection portion of the power supply wiring 142 toward the center of the radiating element 121. The other end of the plate electrode 161 is connected to the radiating element 121 through a via 165.

[0080] The length of the plate electrode 161 in the X-axis direction is the wavelength λ of the high-frequency signal transmitted by the power supply wiring 141. １ The electrical length is set to correspond to ¼ of the radiating element 121. By setting these dimensions, the plate electrode 161, together with the radiating element 121, constitutes a microstrip line type bandstop filter (trap filter) that removes high frequency signals in the first frequency band. This makes it possible to remove signal components in the first frequency band that are included in high frequency signals transmitted to the radiating element 121 by the feed wiring 142.

[0081] When the filter circuits arranged in both power supply paths are microstrip line type filters, if the plate electrodes constituting each filter circuit are arranged on the same dielectric layer, there is a possibility that the plate electrodes may interfere with each other depending on the position of the power supply point. In such an arrangement, by configuring the antenna module 100C so that the radiating element 121 is arranged between the two plate electrodes 151 and 161, it is possible to suppress interference between the plate electrodes.

[0082] (Modification 4) In Modification 4, an example will be described in which one of the filter circuits configures a microstrip bandstop filter together with a ground electrode GND as disclosed in International Publication No. 2023 / 214473 (Patent Document 1).

[0083] Fig. 11 is a perspective view of the internal structure of an antenna module 100D of Modification 4. In Fig. 11 as well, the dielectric in the dielectric substrate 130 is omitted for ease of explanation.

[0084] In the antenna module 100D, the portion of the plate electrode 170 (i.e., the slit 175) in the antenna module 100 of the first embodiment is eliminated, and a power supply line 142D is provided in place of the low-frequency power supply line 142. Furthermore, the antenna module 100D is provided with a plate electrode 162 connected to the power supply line 142D.

[0085] The power supply wiring 142D includes a plate electrode 1422 and a via 1421. The plate electrode 1422 is a strip-shaped electrode and is arranged facing the ground electrode GND on a dielectric layer closer to the radiating element 121 than the ground electrode GND. One end of the via 1421 is connected to an end of the plate electrode 1422, and rises from below the feed point SP2 of the radiating element 121 to the radiating element 121. An end of the via 1421 is connected to the plate electrode 152.

[0086] The plate electrode 162 is a strip-shaped electrode, and is arranged parallel to the plate electrode 1422 on the same dielectric layer as the plate electrode 1422 of the power supply wiring 142D. One end of the plate electrode 162 is open, and the other end of the plate electrode 162 is connected to the power supply wiring 142D. The line length of the plate electrode 162 is equal to the wavelength λ of the high-frequency signal transmitted by the power supply wiring 141. １ The electrical length is set to 1 / 4 of the original length.

[0087] With this configuration, the plate electrode 162, together with the ground electrode GND, functions as a microstrip band-stop filter, which can remove signal components in the first frequency band that are included in the high-frequency signal transmitted to the radiating element 121 by the feeder wiring 142D.

[0088] Although the antenna module 100D has been described as an example in which a conventional band-stop filter is applied to the low-frequency filter circuit, a conventional band-stop filter may be applied to the high-frequency filter circuit instead. Also, although the antenna module 100D employs a microstrip band-stop filter as the high-frequency filter circuit, a coplanar band-stop filter may be employed instead.

[0089] The "power supply wiring 142D" in Modification 4 corresponds to the "fourth power supply wiring" in the present disclosure. The "plate electrode 1422" in Modification 4 corresponds to the "first line" in the present disclosure. The "plate electrode 162" in Modification 4 corresponds to the "fifth plate electrode" in the present disclosure. The "power supply point SP2" in Modification 4 corresponds to the "fifth power supply point" in the present disclosure.

[0090] [Embodiment 2] In the first embodiment and its modified examples, a dual-band antenna module using a single radiating element has been described. In the second embodiment, a configuration will be described in which the filter circuit of the present disclosure is applied to a single-band antenna module that radiates radio waves in a single frequency band.

[0091] 12 is a side perspective view of an antenna module 100E according to the second embodiment. The antenna module 100E has a configuration in which the portion of the power supply circuit on the low frequency side in the antenna module 100 of the embodiment is deleted. That is, a flat plate electrode 151 that functions as a band-stop filter is disposed on the power supply wiring 141.

[0092] In a single-band antenna module, there are no high-frequency signals in different frequency bands that should be radiated from the same radiating element. However, if, for example, a high-frequency signal in a different frequency band is radiated from another adjacent radiating element, or if there is a noise source generating noise in a specific frequency band around the antenna module, the length of the plate electrode 151 can be set to a length corresponding to the frequency band of the noise to be removed, thereby reducing the impact of these noises on the radiating element 121.

[0093] In the antenna module 100E of FIG. 12, a microstrip band-stop filter is used as the filter circuit, but instead, a coplanar band-stop filter may be used.

[0094] (Modification 5) In Modification 5, a configuration will be described in which the filter circuit of the present disclosure is applied to a configuration in which a high-frequency signal in the same frequency band is branched and supplied to two different feeding points.

[0095] Fig. 13 is a side perspective view of an antenna module 100F according to Modification 5. In addition to the configuration of antenna module 100E according to Embodiment 2 shown in Fig. 12, antenna module 100F further includes a plate electrode 151A and a via 155A, and power supply wiring 141 is branched in two directions.

[0096] 13, the power supply wiring 141 branches into a first wiring 141A and a second wiring 141B at a branch point TP. The first wiring 141A is connected to the plate electrode 151, similar to the antenna module 100E of FIG. 12, and transmits a high-frequency signal to a power supply point SP1.

[0097] The second wiring 141B transmits a high frequency signal to the feed point SP2 of the radiating element 121. The feed point SP2 is arranged at a position substantially symmetrical to the feed point SP1 with respect to the center of the radiating element 121.

[0098] An end of the second wiring 141B is connected to one end of the plate electrode 151A. The other end of the plate electrode 151A is connected to the radiating element 121 by a via 155A. The connection portion of the plate electrode 151A to the second wiring 141B is located at a position facing the feed point SP2 of the radiating element 121, and is capacitively coupled to the radiating element 121.

[0099] The plate electrode 151A has the same shape and dimensions as the plate electrode 151, and extends from the connection point of the second wiring 141B in the negative direction of the X-axis, that is, toward the center of the radiating element 121.

[0100] Here, if the wavelength of the high frequency signal supplied by the power supply wiring 141 is λ, the difference between the line length of the first wiring 141A from the branch point TP to the plate electrode 151 and the line length of the second wiring 141B from the branch point TP to the plate electrode 151A is set to be an odd multiple of λ / 2. In other words, the high frequency signal supplied to the power supply point SP2 has an opposite phase to the high frequency signal supplied to the power supply point SP1.

[0101] In this way, by supplying high frequency signals of opposite phases to feeding points located symmetrically with respect to the center of the radiating element 121, the phases of the radio waves radiated by the high frequency signals supplied to each feeding point match.

[0102] As described above, even in an antenna module configured to supply high-frequency signals of opposite phases to two feed points arranged symmetrically with respect to the center of the radiating element, the effect of noise on the radiating element 121 can be reduced by providing plate electrodes that function as band-stop filters on each feed wiring.

[0103] (Modification 6) In Modification 6, a configuration will be described in which the filter circuit of the present disclosure is applied to a planar inverted-F antenna (PIFA).

[0104] Fig. 14 is a side perspective view of an antenna module 100G according to Modification 6. In addition to the configuration of the antenna module 100E according to Embodiment 2 shown in Fig. 12, the antenna module 100G is configured to have a ground via VG1 for connecting the radiating element 121 and the ground electrode GND. Note that multiple ground vias VG1 may be provided.

[0105] Similar to the antenna module 100E, the radiating element 121 has a rectangular shape when viewed in a planar view from the Z-axis direction, and a feed point SP1 is disposed at a position offset from the center of the radiating element 121 in the negative direction of the X-axis. The radiating element 121 and the ground electrode GND are connected by a ground via VG1 at the end of the radiating element 121 in the positive direction of the X-axis. With this configuration, the antenna module 100E functions as a planar inverted-F antenna.

[0106] A high frequency signal transmitted through the power supply line 141 is supplied to the power supply point SP1 by capacitive coupling. A plate electrode 151 connected to the power supply line 141 and the radiating element 121 form a filter circuit.

[0107] In such an antenna module of a planar inverted-F antenna, the influence of noise on the radiating element 121 can be reduced by providing a plate electrode that functions as a band-stop filter on the power supply wiring.

[0108] Aspects It will be understood by those skilled in the art that the exemplary embodiments described above are examples of the following aspects.

[0109] (Item 1) An antenna module according to one aspect includes a flat-plate-shaped radiating element, a ground electrode arranged opposite the radiating element, a first feed wiring, and a strip-shaped first plate electrode. The first feed wiring transmits a high-frequency signal in a first frequency band to a first feed point of the radiating element. One end of the first plate electrode is connected to the radiating element. The radiating element is electrically coupled to the first feed wiring. The first plate electrode, together with the radiating element, forms a filter circuit.

[0110] (Item 2) In the antenna module described in item 1, the first plate electrode is disposed opposite the radiating element. One end of the first power supply wiring is disposed opposite the first power supply point and spaced apart from the first power supply point. The other end of the first plate electrode is connected to the one end of the first power supply wiring.

[0111] (Item 3) In the antenna module described in item 2, the first plate electrode includes a first portion including a portion connected to the first power supply wiring and a second portion including a portion connected to the radiating element, and the line width of the first portion is wider than the line width of the second portion.

[0112] (4) In the antenna module described in 2 or 3, the first plate electrode is disposed between the radiating element and the ground electrode. The antenna module further includes a shielding member connected to the radiating element and disposed to cover the first plate electrode. The shielding member includes a first member having a flat plate shape disposed between the first plate electrode and the ground electrode, and a second member connecting the first member to the radiating element.

[0113] (Item 5) In the antenna module described in item 2 or 3, the radiating element is disposed between the first flat plate electrode and the ground electrode.

[0114] (Item 6) In the antenna module described in any one of items 2 to 5, the first plate electrode extends from a position opposite the first feed point toward the center of the radiating element.

[0115] (Item 7) In the antenna module described in item 1, the first plate electrode is configured as a part of the radiating element. The other end of the first plate electrode is a first feeding point. A slit is formed between the radiating element and a peripheral edge portion of the first plate electrode other than the one end.

[0116] (Item 8) In the antenna module described in item 7, one end of the first feed wiring is disposed at a position facing the first feed point and spaced apart from the first feed point.

[0117] (Item 9) In the antenna module described in item 7 or 8, the first plate electrode extends from the first feeding point toward the center of the radiating element.

[0118] (Item 10) In the antenna module described in item 1, the radiating element has a substantially rectangular shape when viewed from above in the normal direction. One side of the radiating element is connected to the ground electrode.

[0119] (Item 11) The antenna module described in item 1 further includes a second feed wiring and a strip-shaped second plate electrode. The second feed wiring transmits a high-frequency signal in a first frequency band to a second feed point of the radiating element. One end of the second plate electrode is connected to the radiating element. The first feed point is offset from the center of the radiating element in a first direction. The second feed point is offset from the center of the radiating element in a second direction intersecting the first direction. The radiating element is electrically coupled to the second feed wiring. The second plate electrode, together with the radiating element, forms a filter circuit.

[0120] (Item 12) The antenna module described in item 1 further includes a strip-shaped third plate electrode having one end connected to the radiating element. The third plate electrode forms a filter circuit together with the radiating element. The radiating element has a third feed point disposed at a position substantially symmetrical to the first feed point with respect to the center of the radiating element. The first feed wiring includes a first wiring extending from a branch point to the first feed point and a second wiring extending from the branch point to the third feed point. The radiating element is electrically coupled to the first wiring and the second wiring. When the wavelength of the high-frequency signal transmitted by the first feed wiring is λ, the difference between the line length of the first wiring and the line length of the second wiring is an odd multiple of λ / 2.

[0121] (Item 13) The antenna module according to any one of items 1 to 12 further includes a third feed wiring and a strip-shaped fourth plate electrode. The third feed wiring transmits a high-frequency signal in a second frequency band different from the first frequency band to a fourth feed point different from the first feed point of the radiating element. One end of the fourth plate electrode is connected to the radiating element. The radiating element is electrically coupled to the third feed wiring. The fourth plate electrode, together with the radiating element, forms a filter circuit.

[0122] (Item 14) In the antenna module described in item 13, the first plate electrode is arranged facing the radiating element. One end of the first feed wiring is arranged facing the first feed point and spaced apart from the first feed point. The other end of the first plate electrode is connected to one end of the first feed wiring. The fourth plate electrode is configured as a part of the radiating element. The other end of the fourth plate electrode is the fourth feed point. A slit is formed between the radiating element and a peripheral edge portion of the fourth plate electrode other than the one end.

[0123] (Item 15) In the antenna module described in item 13, the first plate electrode and the fourth plate electrode are arranged facing the radiating element. One end of the first feed wiring is arranged facing the first feed point and spaced apart from the first feed point. The other end of the first plate electrode is connected to one end of the first feed wiring. One end of the third feed wiring is arranged facing the fourth feed point and spaced apart from the fourth feed point. The other end of the fourth plate electrode is connected to one end of the third feed wiring.

[0124] (Item 16) The antenna module according to any one of items 1 to 12 further includes a fourth feed wiring and a strip-shaped fifth plate electrode. The fourth feed wiring transmits a high-frequency signal in a second frequency band different from the first frequency band to a fifth feed point different from the first feed point of the radiating element. One end of the fifth plate electrode is connected to the fourth feed wiring. The fourth feed wiring includes a first line arranged opposite to the ground electrode and constituting a microstrip line together with the ground electrode. The fifth plate electrode is arranged opposite to the first line and along the first line. One end of the fifth plate electrode is connected to the first line. The fifth plate electrode, together with the ground electrode, constitutes a filter circuit.

[0125] (17) The antenna module according to any one of the first to sixteenth paragraphs further comprises a feeding circuit for supplying a high frequency signal to the radiating element.

[0126] (18th item) A communication device is equipped with the antenna module according to any one of the first to seventeenth items.

[0127] The embodiments disclosed herein should be considered to be illustrative in all respects and not restrictive. The scope of the present invention is defined by the claims, not by the description of the above embodiments, and is intended to include all modifications within the meaning and scope of the claims.

[0128] 10 Communication device, 100, 100A to 100G Antenna module, 110 RFIC, 111A to 111H, 113A to 113H, 117A, 117B Switch, 112AR to 112HR Low noise amplifier, 112AT to 112HT Power amplifier, 114A to 114H Attenuator, 115A to 115D Phase shifter, 116A, 116B Signal combiner / divider, 118A, 118B Mixer, 119A, 119B Amplifier circuit, 120 Antenna device, 121, 121A to 121D, 121X Radiating element, 130 Dielectric substrate, 131, 132 Main surface, 141 to 144, 142D Power supply wiring, 141A First wiring, 141B Second wiring, 151 to 154, 151A, 161, 162, 170, 171, 1422 Plate electrode, 1511 First portion, 1512 Second portion, 155, 156, 155A, 165, 1421 Via, 160 Solder bump, 175 Slit, 190 Shield member, 191 First member, 192 Second member, 200 BBIC, GND Ground electrode, SP1 to SP4 Power supply points, TP Branch point, VG1 Ground via.

Claims

1. An antenna module comprising: a flat-plate radiating element; a ground electrode arranged opposite the radiating element; a first feed wiring that transmits a high-frequency signal in a first frequency band to a first feed point of the radiating element; and a strip-shaped first flat-plate electrode having one end connected to the radiating element, wherein the radiating element is electrically coupled to the first feed wiring, and the first flat-plate electrode forms a filter circuit together with the radiating element.

2. The antenna module according to claim 1, wherein the first plate electrode is disposed opposite the radiating element, one end of the first power supply wiring is disposed at a position opposite the first power supply point and spaced apart from the first power supply point, and the other end of the first plate electrode is connected to one end of the first power supply wiring.

3. An antenna module as described in claim 2, wherein the first plate electrode includes a first portion including a connection portion with the first power supply wiring and a second portion including a connection portion with the radiating element, and the line width of the first portion is wider than the line width of the second portion.

4. An antenna module as described in claim 2 or claim 3, wherein the first plate electrode is disposed between the radiating element and the ground electrode, and the antenna module further comprises a shielding member connected to the radiating element and disposed to cover the first plate electrode, and the shielding member includes a flat-plate-shaped first member disposed between the first plate electrode and the ground electrode, and a second member connecting the first member to the radiating element.

5. The antenna module according to claim 2 or 3, wherein the radiating element is disposed between the first flat plate electrode and the ground electrode.

6. An antenna module according to any one of claims 2 to 5, wherein the first plate electrode extends from a position opposite the first feed point toward the center of the radiating element.

7. The antenna module according to claim 1, wherein the first plate electrode is configured as a part of the radiating element, the other end of the first plate electrode is the first feeding point, and a slit is formed between the radiating element and a peripheral edge portion of the first plate electrode other than the one end.

8. The antenna module according to claim 7, wherein one end of the first feed wiring is arranged at a position facing the first feed point and spaced apart from the first feed point.

9. The antenna module according to claim 7 or 8, wherein the first plate electrode extends from the first feeding point toward the center of the radiating element.

10. The antenna module according to claim 1, wherein the radiating element has a substantially rectangular shape when viewed in a plan view from the normal direction, and one side of the radiating element is connected to the ground electrode.

11. The antenna module described in claim 1, further comprising: a second feed wiring that transmits a high-frequency signal in the first frequency band to a second feed point in the radiating element; and a strip-shaped second flat plate electrode having one end connected to the radiating element, wherein the first feed point is offset in a first direction from the center of the radiating element; the second feed point is offset from the center of the radiating element in a second direction that intersects with the first direction; the radiating element is electrically coupled to the second feed wiring; and the second flat plate electrode forms a filter circuit together with the radiating element.

12. The antenna module according to claim 1, further comprising a band-shaped third plate electrode having one end connected to the radiating element, the third plate electrode constituting a filter circuit together with the radiating element, the radiating element having a third feed point arranged at a position substantially symmetrical to the first feed point with respect to the center of the radiating element, the first feed wiring including: a first wire extending from a branch point to the first feed point; and a second wire extending from the branch point to the third feed point, the radiating element being electrically coupled to the first wire and the second wire, wherein, when the wavelength of the high-frequency signal transmitted by the first feed wiring is λ, the difference between the line length of the first wire and the line length of the second wire is an odd multiple of λ / 2.

13. An antenna module as claimed in any one of claims 1 to 12, further comprising: a third feed wiring that transmits a high-frequency signal in a second frequency band different from the first frequency band to a fourth feed point different from the first feed point of the radiating element; and a band-shaped fourth flat plate electrode having one end connected to the radiating element, wherein the radiating element is electrically coupled to the third feed wiring, and the fourth flat plate electrode forms a filter circuit together with the radiating element.

14. The antenna module described in claim 13, wherein the first plate electrode is arranged opposite the radiating element, one end of the first feed wiring is arranged opposite the first feed point and spaced apart from the first feed point, the other end of the first plate electrode is connected to one end of the first feed wiring, the fourth plate electrode is configured as part of the radiating element, the other end of the fourth plate electrode is the fourth feed point, and a slit is formed between the radiating element and a peripheral edge portion other than the one end of the fourth plate electrode.

15. The antenna module described in claim 13, wherein the first plate electrode and the fourth plate electrode are arranged opposite the radiating element, one end of the first feed wiring is arranged opposite the first feed point and spaced apart from the first feed point, the other end of the first plate electrode is connected to one end of the first feed wiring, one end of the third feed wiring is arranged opposite the fourth feed point and spaced apart from the fourth feed point, and the other end of the fourth plate electrode is connected to one end of the third feed wiring.

16. The antenna module according to any one of claims 1 to 12, further comprising: a fourth feed wiring that transmits a high-frequency signal in a second frequency band different from the first frequency band to a fifth feed point different from the first feed point of the radiating element; and a strip-shaped fifth plate electrode having one end connected to the fourth feed wiring, wherein the fourth feed wiring includes a first line that is arranged opposite to the ground electrode and that forms a microstrip line together with the ground electrode, the fifth plate electrode faces the first line and is arranged along the first line, one end of the fifth plate electrode is connected to the first line, and the fifth plate electrode forms a filter circuit together with the ground electrode.

17. The antenna module according to any one of claims 1 to 16, further comprising a feeding circuit for supplying a high frequency signal to the radiating element.

18. A communication device equipped with the antenna module according to any one of claims 1 to 17.

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