Multi-feed antenna arrangement for electronic devices

Abstract

The present application relates to an antenna device (1) comprising a dielectric element (2), at least one conductive element (3), an antenna radiator (4) and a plurality of excitation elements (6). The antenna radiator (4) is arranged at a first surface (2a) of the dielectric element (2) and at a distance (D, D') from the conductive element (3) such that a gap (5) is formed between the antenna radiator (4) and a first surface (3a) of the conductive element (3). The excitation elements (6) extend at least partially through the gap (5) and are arranged on or adjacent to the conductive element (3). The antenna radiator can comprise a conductive material and be printed, sintered, painted, laminated or deposited on the first surface (2a) of the dielectric element (2) or molded into the dielectric element (2).

Description

Technical Field

[0001] This disclosure relates to an antenna device for an electronic device, the antenna device including an antenna radiator and a plurality of antenna feeds. Background Technology

[0002] Smartphones and other electronic devices must support an increasing number of cellular wireless technologies. For example, 5G requires new radio technologies because the frequency range used will expand from below 6 GHz to millimeter-wave (mmWave) frequencies, such as above 20 GHz. To achieve mmWave frequencies, antenna arrays are typically implemented in modules fixed to the smartphone's main printed circuit board (PCB). The PCB may include the antenna array, where the main radiating beam direction is along the wide side, i.e., perpendicular to the smartphone's display and back cover. The PCB can also be configured such that the main radiating beam direction is end-fire, i.e., parallel to the smartphone's display and back cover. In the latter case, the antenna array typically occupies some space within the device's metal edge.

[0003] These mmWave modules, especially when several modules are needed to achieve sufficiently good multi-surface spherical beam coverage, leave very limited space within the device for additional components such as antennas.

[0004] In addition, modern smartphones require antenna systems capable of covering multiple frequency bands with a wide bandwidth, where multiple multiple input multiple output (MIMO) antennas operate in each frequency band.

[0005] Currently, antennas for the 700-960 MHz and 1700-2700 MHz frequency bands are typically implemented using portions of the device's metal edge, i.e., the space already occupied by, for example, mmWave antenna arrays. To accommodate additional antennas, such as 5G NR antennas below 6 GHz, other available space within the smartphone must be used for these additional antennas.

[0006] In other words, especially in terms of smartphone thickness, the biggest challenge in providing additional antenna elements in smartphones is the extremely limited available volume. Current low-profile antennas are typically too thick and are often extremely difficult to integrate with existing structures and components.

[0007] Therefore, there is a need for new antennas with low profiles that can be easily integrated into the limited environments inside modern smartphones. Summary of the Invention

[0008] The objective is to provide an improved antenna device for electronic devices. The above and other objectives are achieved through the features of the independent claims. Other implementations are apparent from the appended claims, the specification, and the drawings.

[0009] According to a first aspect, an antenna device is provided, the antenna device comprising a dielectric element, at least one conductive element, an antenna radiator, and a plurality of excitation elements. The antenna radiator is disposed on a first surface of the dielectric element and spaced at a distance from the conductive element, such that a gap is formed between the antenna radiator and the first surface of the conductive element. The excitation elements extend at least partially through the gap and are disposed on or adjacent to the conductive element.

[0010] This configuration allows the use of existing gaps, such as those necessary to accommodate battery expansion and manufacturing tolerances, to generate the radiated current for the antenna assembly. By effectively utilizing a volume already present within the electronics for two purposes, the physical size of the antenna can be reduced compared to state-of-the-art solutions, while providing a larger effective volume. Furthermore, the use of multiple excitation elements allows for control and adaptation of the coupling level between the antenna assembly's feed sources. When properly designed, this coupling can be used to cancel some reflected power and increase radiated power. Additionally, only a small portion of the dielectric element is needed for the antenna assembly. The advantage here is that the remaining area of ​​the dielectric element, such as the back cover, can accommodate other desired components, such as a camera module.

[0011] In a possible implementation of the first aspect, the antenna radiator comprises a conductive material and is formed on a first surface of the dielectric element or molded into the dielectric element by one of the following methods: printing, sintering, painting, laminating, or deposition. This not only allows the antenna radiator to have any suitable shape or size, but also allows the antenna radiator to be applied to or into the dielectric element in several suitable ways.

[0012] In another possible implementation of the first aspect, the antenna radiator is electrically isolated from the conductive element. Conductive elements, such as the main baseplate of an electronic device, are too electrically potent to contribute effectively and in a controlled manner to radiation frequencies exceeding approximately 2 GHz. However, for a separate local baseplate antenna in the form of an antenna radiator, the antenna dimensions can be designed to optimally radiate in the desired frequency band.

[0013] In another possible implementation of the first aspect, the excitation element is arranged along the periphery of the antenna radiator. This placement ensures that the excitation element does not encroach upon or affect the gap volume required, for example, to accommodate battery expansion.

[0014] In another possible implementation of the first aspect, the excitation element is superimposed on the antenna radiator. This allows the excitation elements to be coupled to each other and / or reduces the number of excitation elements.

[0015] In another possible implementation of the first aspect, the antenna device includes at least a first pair of excitation elements and a second pair of excitation elements, the first pair of excitation elements being decoupled from the second pair of excitation elements. This allows the antenna device to effectively form two frequency-tunable antennas that cannot be independently controlled but are always tuned to the same frequency, thereby improving antenna efficiency.

[0016] In another possible implementation of the first aspect, the antenna device includes at least a first pair of excitation elements and a second pair of excitation elements, wherein a first excitation element in the first pair of excitation elements is coupled to a second excitation element in the first pair of excitation elements, and a first excitation element in the second pair of excitation elements is coupled to a second excitation element in the second pair of excitation elements. The first pair of excitation elements is coupled to the second pair of excitation elements. The coupling is performed through a first feed network and excites a first antenna signal with a first polarization, effectively reducing the number of components required while still achieving a sufficient signal level.

[0017] In another possible implementation of the first aspect, a first excitation element in the first pair of excitation elements is coupled to a first excitation element in the second pair of excitation elements, and a second excitation element in the first pair of excitation elements is coupled to a second excitation element in the second pair of excitation elements. The coupling is performed through a second feed network and excites a second antenna signal having a second polarization orthogonal to the first polarization. This forms two frequency-tunable antennas that achieve orthogonal polarization.

[0018] In another possible implementation of the first aspect, each excitation element is currently, capacitively, or inductively coupled to at least one other excitation element and / or antenna radiator. Current coupling provides a reliable and well-known type of coupling. Non-contact coupling, such as capacitive and inductive coupling, can be fabricated on a PCB or device baseboard, along with any required matching networks and other control circuitry.

[0019] In another possible implementation of the first aspect, the first polarization is -45° and the second polarization is +45°, which improves the uniformity of the received signal level and improves coverage in congested environments.

[0020] In another possible implementation of the first aspect, the first feed network and / or the second feed network includes a power splitter coupled to the first phase shifter and the second phase shifter, wherein the phase shift of the second phase shifter is 180° relative to the phase of the first excitation element, and the appropriate phase shift between the feed signals facilitates optimal execution of multi-feed operation.

[0021] In another possible implementation of the first aspect, the conductive element is configured such that the distance between the first surface of the dielectric element and the first surface of the conductive element is variable, thereby allowing for thermal expansion of conductive elements such as batteries and / or taking into account manufacturing tolerances.

[0022] In another possible implementation of the first aspect, the antenna device includes at least one tunable element for tuning the resonant frequency of the antenna device. A tunable matching component can be used to tune the impedance of the feed port of the excitation element so that the impedance is optimal for each sub-band.

[0023] In another possible implementation of the first aspect, the tunable element is a varactor diode, a switch, and / or a phase shifter, allowing tuning to be performed via various components.

[0024] In another possible implementation of the first aspect, the resonant frequency is tuned by a tunable element in response to a change in the distance between the first surface of the dielectric element and the first surface of the conductive element, thereby allowing the gap between the dielectric element and the conductive element to not only accommodate the thermal expansion of the conductive element, but also provide an effective antenna volume.

[0025] In another possible implementation of the first aspect, the tunable element is used to optimize the radiation mode of the antenna device and / or to tune the resonant frequency using changes in the radiation mode.

[0026] In another possible implementation of the first aspect, the conductive element is a battery, and the distance change is caused by the thermal expansion of the battery. This allows existing components to improve the performance of the antenna device.

[0027] In another possible implementation of the first aspect, the antenna radiator is a patch radiator, which optionally includes at least one slot. As seen from the gap direction, such an antenna radiator occupies very little space and is easily mounted to or molded into a dielectric element.

[0028] In another possible implementation of the first aspect, the patch radiator includes two slots that extend parallel to each other in a first direction and are offset in a second direction perpendicular to the first direction. By providing the second slot, further resonances can be excited without significantly affecting the resonances excited by the patch and the first slot.

[0029] In another possible implementation of the first aspect, the patch radiator includes four slots, each slot extending collinearly with one of the slots and orthogonally to the remaining slots, each slot extending from a periphery of the patch radiator toward a central point. This allows for a reduction in the number of excitation elements while providing an antenna arrangement that efficiently includes two frequency-tunable antennas with orthogonal polarization and simultaneously controlled to the same frequency.

[0030] In another possible implementation of the first aspect, the slots are formed in a cross shape, the cross shape being interrupted at a common center point. Further resonance can be excited by providing additional slots.

[0031] In another possible implementation of the first aspect, the tunable elements are arranged at the periphery of the patch radiator, with each tunable element arranged near a slot, thereby allowing tuning of the operating frequency of each slot.

[0032] In another possible implementation of the first aspect, the size and / or number of slots are configured to generate one or more desired resonant frequencies, thereby improving the performance of the antenna device.

[0033] In another possible implementation of the first aspect, the antenna radiator comprises several separate radiator sections separated by dielectric gaps, thereby realizing a multimode antenna device.

[0034] According to a second aspect, an apparatus is provided that includes the aforementioned antenna device, display, and housing, wherein the housing includes a dielectric element of the antenna device, and the conductive element of the antenna device is one of a battery, a printed circuit board, and a device base plate.

[0035] This solution allows the antenna to utilize the free volume within the device, for example, due to gaps between conductive elements and the device housing. Furthermore, the antenna device does not require an additional printed circuit board, as the excitation elements, feed structure, matching, and tuning circuitry can be arranged on the main printed circuit board.

[0036] This aspect and others will be apparent from the embodiments described below. Attached Figure Description

[0037] In the following detailed description of the invention, aspects, embodiments, and implementations will be explained in more detail with reference to exemplary embodiments shown in the accompanying drawings, in which: Figure 1 shows a partial schematic cross-sectional view of a prior art antenna device; Figure 2 A partial schematic cross-sectional view of an antenna device according to an embodiment of the present invention is shown; Figure 3A partial perspective view of an electronic device including an antenna device, illustrating an example of an embodiment of the present invention; Figure 4 A partial perspective view of an electronic device including an antenna device, illustrating an example of an embodiment of the present invention; Figure 5 a-5c shows a schematic top view of a portion of an antenna device as an example of an embodiment of the present invention; Figure 6 A perspective view of an electronic device including an antenna device, illustrating an example of an embodiment of the present invention; Figure 7 A partial perspective view of an antenna device according to an embodiment of the present invention is shown; Figure 8 A partial perspective view of an antenna device according to an embodiment of the present invention is shown; Figure 9 A partial perspective view of an antenna device according to an embodiment of the present invention is shown; Figure 10 A schematic top view of a portion of an antenna device according to an embodiment of the present invention is shown; Figure 11 An illustration of a portion of an antenna device, representing an embodiment of the present invention, is shown. Detailed Implementation

[0038] Figure 1 illustrates a prior art antenna device. The antenna device includes a dielectric element 2, such as the back cover of an electronic device like a smartphone or tablet, a battery 3b, a printed circuit board (PCB) 3c, a device base plate 3d, and an antenna radiator 4 connected to a separate antenna PCB. A gap exists between the antenna radiator 4 and the dielectric element 2, which is necessary to accommodate, for example, the thermal expansion of the battery 3b.

[0039] Figure 2 An embodiment of the invention is illustrated, wherein the antenna device 1 includes a dielectric element 2, which may be the back cover of an electronic device such as a smartphone or tablet, as described above; at least one conductive element 3, such as a battery 3b, a PCB 3c, and / or a device base plate 3d; and an antenna radiator 4 connected to the dielectric element 2. A gap 5 extends between the antenna radiator 4 and the conductive element 3, i.e., the antenna radiator 4 and the conductive element 3 are at least partially stacked on top of each other, as shown in a direction perpendicular to the display or back cover of the device 10. A plurality of excitation elements 6 extend at least partially through the gap 5 and are arranged on or adjacent to the conductive element 3. The antenna device 1 may have an extremely low profile, for example, a thickness as low as about 0.5 mm.

[0040] Figure 3 , 4Figures 6 and 7 illustrate an embodiment of a device 10 including an antenna assembly 1. The device 10 also includes a display 11 and a housing 12. The housing includes the dielectric element 2 of the antenna assembly 1, and as described above, the conductive element 3 of the antenna assembly 1 is one or more of a battery 3b, a printed circuit board 3c, and a device base plate 3d.

[0041] Antenna radiator 4 is positioned on the first surface 2a of dielectric element 2 and is spaced D and D' from conductive element 3, forming a gap 5 between antenna radiator 4 and the first surface 3a of conductive element 3. Figure 2 As shown, the gap may extend between the antenna radiator 4 and the battery 3b, and / or between the antenna radiator 4 and the device base plate 3d. The effective antenna volume formed by the gap 5 may be defined differently depending on which conductive element 3 is used as part of the antenna device 1. Furthermore, the conductive element 3 may be configured such that the distances D, D' between the first surface 2a of the dielectric element 2 and the first surface 3a of the conductive element 3 are variable. When the conductive element 3 is a battery, the variation in distances D, D' is at least partly due to the thermal expansion of the battery.

[0042] The antenna radiator 4 may include a conductive material and may be formed on the first surface 2a of the dielectric element 2 by means of printing, sintering, painting, laminating, or deposition, or molded into the dielectric element 2. For example, the antenna radiator 4 may be a metal pattern printed on the inner surface of the glass back cover, or it may be painted onto the inner surface. The antenna radiator may be completely planar or follow the shape of the first surface 2a of the dielectric element 2.

[0043] In addition, the antenna radiator 4 can be electrically isolated from the conductive element 3 and the ground plane of the device 10.

[0044] Antenna radiator 4 may include several separate radiator sections separated by dielectric gaps, such as Figure 5 As shown, this allows for multi-mode operation. In this case, the properties of antenna device 1 can be further modified by using aperture matching components, and different non-metallic materials, such as high dielectric constant blocks, can be used.

[0045] Antenna radiator 4 can be a patch radiator 8, which optionally includes at least one slot 9, such as Figure 5 As shown in b and 5c. Figure 5 a shows a patch radiator 8 without a slot. The patch radiator 8 can be rectangular, disk-shaped, ellipsoidal, or have any other suitable shape. The slot 9 can be rectangular or have any other suitable shape.

[0046] Figure 3 , 5 Tables b, 5c, and 6 show a patch radiator 8 including one slot. The patch radiator 8 may also include two slots 9, such as... Figure 4As shown, or four slots 9, such as Figure 10 As shown.

[0047] In an embodiment including two slots 9, the slots 9 may extend parallel in a first direction while offset in a second direction perpendicular to the first direction, such as... Figure 4 As shown.

[0048] When the patch radiator 8 includes four slots 9, each slot 9 may extend collinearly with one of the slots 9 and orthogonally to the remaining slots 9, with each slot 9 extending from a periphery of the patch radiator 8 toward a center point. In other words, the slots 9 together form an X or cross shape, which is interrupted at the common center point of the slots, such that the center point includes the radiator material, such as... Figure 10 As shown.

[0049] The dimensions of antenna radiator 4 define the resonant modes. The longitudinal dimension of antenna radiator 4 defines the lowest resonance, while the orthogonal dimension (width) of antenna radiator 4 defines the highest resonance.

[0050] The size and / or number of slots 9 can be configured to generate one or more desired resonant frequencies. By providing a second slot, a third resonance can be excited without significantly affecting the two initial resonances excited by the patch and the first slot.

[0051] By increasing the width of slot 9, the current path along the longest dimension can be lengthened, thereby shifting the first and third resonant frequencies downwards. The same applies to the second resonant frequency. Since the second resonant frequency is generated through the cooperative use of excitation element 6 and utilizes a diagonal current mode, see [link to relevant documentation]. Figure 3 , 4 In excitation elements 6 arranged diagonally in 5b and 5c, increasing the slot length increases the current path and shifts the frequency downwards. Due to the different current distribution, the slot width does not significantly affect the second resonant frequency. On the other hand, the slot length has little effect on the first and third resonant frequencies.

[0052] The radiation mode of antenna radiator 4 is mainly affected by two factors: the size and shape of antenna radiator 4 and excitation element 6. In addition to the radiation mode, impedance also needs to be designed to effectively utilize multiple feed sources.

[0053] The excitation element 6 for the radiating current in the excitation antenna radiator 4 can be arranged along the periphery of the antenna radiator 4, such as... Figures 2 to 9 As shown. Figure 3 , 4 As shown in Figure 5b, the excitation element 6 can be arranged along the orthogonal extended edge of the antenna radiator 4. The excitation element 6 can also be arranged along the parallel edge of the antenna radiator 4. Figure 5 At the same width shown in a and Figure 5The different widths are shown in c.

[0054] Optionally, the excitation element 6 can be superimposed on the antenna radiator 4, such as... Figure 10 and 11 As shown. The excitation element 6 can be symmetrically distributed, with one excitation element distributed in each quadrant of the antenna radiator 4.

[0055] Using a single excitation element 6, a radiation mode can be effectively excited along the longest dimension of the antenna radiator 4. The antenna's S-parameters have two resonances in the 3.3–4.2 GHz frequency band. By providing several excitation elements 6, the combined operation of two excitation elements 6 can excite further radiation modes. Similarly, for the S-parameters, new resonances are generated so that three resonances occur in the desired frequency band.

[0056] Excitation element 6 can be any suitable conventional type of excitation element 6. Figures 6 to 8 An embodiment including an inverted-F antenna (IFA) type excitation element 6 is shown. When the antenna device operates in the N77 band, the maximum instantaneous bandwidth required is 100 MHz. Therefore, the tunable element 7 must be designed to be constant across nine separate 100 MHz sub-bands.

[0057] When the excitation element 6 is superimposed on the antenna radiator 4, the antenna device can be configured to include at least a first pair of excitation elements 6a and 6b and a second pair of excitation elements 6c and 6d, wherein the first pair of excitation elements 6a and 6b are decoupled from the second pair of excitation elements 6c and 6d, such as... Figure 11 As shown.

[0058] The first excitation element 6a in the first pair of excitation elements 6a and 6b can be coupled to the second excitation element 6b in the first pair of excitation elements 6a and 6b, and the first excitation element 6c in the second pair of excitation elements 6c and 6d can be coupled to the second excitation element 6d in the second pair of excitation elements 6c and 6d. Furthermore, the first pair of excitation elements 6a and 6b can be coupled to the second pair of excitation elements 6c and 6d, and this coupling occurs through the first feed network 13a, thereby exciting a first antenna signal with a first polarization.

[0059] Alternatively or concurrently, the first excitation element 6a of the first pair of excitation elements 6a, 6b may be coupled to the first excitation element 6c of the second pair of excitation elements 6c, 6d, and the second excitation element 6b of the first pair of excitation elements 6a, 6b may be coupled to the second excitation element 6d of the second pair of excitation elements 6c, 6d. The coupling of the first excitation elements 6a, 6c to the second excitation elements 6b, 6d is achieved through the second feed network 13b and excites a second antenna signal with a second polarization. Preferably, the second polarization is orthogonal to the first polarization. For example, the first polarization may be -45° and the second polarization may be +45°.

[0060] The first feed network 13a may include a power splitter coupled to the first phase shifter, and the second feed network 13b may include a power splitter coupled to the second phase shifter. The phases of the second excitation elements 6b and 6d are preferably offset by 180° compared to the phases of the first excitation elements 6a and 6c. The phase difference between the excitation elements 6 can be varied in each sub-band to achieve optimal performance.

[0061] Since the phase shift value depends on the frequency, the antenna operation can be tuned to operate on different sub-bands by changing the phase. Furthermore, the tunable element 7, discussed further below, can be used to tune the impedance of the port of the excitation element 6 to be optimal for each sub-band. The multichannel transceiver IC can generate the desired arbitrary phase for the feed signal, which is then fed to the excitation element 6 through a matching network having fixed components (capacitors / inductors) and the tunable element 7.

[0062] Each excitation element 6 can be coupled to the antenna radiator 4 by current, capacitance, or inductance, such as Figures 2 to 9 As shown, current, capacitance, or inductance is coupled to at least one other excitation element 6 and antenna radiator 4, such as Figure 10 and 11 As shown. For example, the excitation element 6 can be in direct contact with the antenna radiator 4, which is in the form of a metal pattern arranged on the glass back cover.

[0063] The antenna device 1 may include at least one tunable element 7 for tuning the resonant frequency of the antenna device 1. Figure 6 and 8 A tunable element is shown, while Figure 10 Four tunable elements 7 are shown. These tunable elements 7 can be varactor diodes, switches, and / or phase shifters. The antenna arrangement can be tuned, for example, between 3.3 and 4.2 GHz, and has an efficiency exceeding -6 dB. Despite challenging environmental and limiting conditions, the average efficiency is still better than -4.5 dB.

[0064] The resonant frequency can be tuned by the tunable element 7 in response to changes in the distances D and D' between the first surface 2a of the dielectric element 2 and the first surface 3a of the conductive element 3.

[0065] Furthermore, the tunable element 7 can be used to optimize the radiation mode of the antenna device 1 and / or to tune the resonant frequency by utilizing changes in the radiation mode.

[0066] In other words, the tunable element 7 can be used to adapt the operation of the antenna device 1 to different types of changes in the operating environment, such as compensating for the reduction in antenna efficiency due to battery expansion, or actively reducing the specific absorption rate (SAR) when operating near a user.

[0067] In one example of compensating for changes in device structure and battery expansion, the gap between battery 3b and dielectric element 2 with antenna radiator 4 is reduced from 0.75 mm to 0.45 mm. Significant improvements in efficiency are achieved by utilizing phase difference and optimal tunable element settings. A noticeable reduction in SAR is observed in most frequency bands by utilizing tunable element 7.

[0068] The tunable element 7 can be arranged around the periphery of the patch radiator 8, such as... Figure 10 As shown, each tunable element 7 is arranged near a slot 9, preferably at one end of the slot 9.

[0069] This document has described various aspects and implementations in conjunction with different embodiments. However, those skilled in the art, upon studying the accompanying drawings, disclosure, and appended claims, will be able to understand and implement other variations of the disclosed embodiments in practicing the claimed subject matter. In the claims, the word "comprising" does not exclude other elements or steps, and "a" or "an" does not exclude a plurality. The enumeration of certain measures in dissimilar appended claims does not imply that combinations of these measures cannot be used advantageously.

[0070] The reference numerals used in the claims should not be construed as limiting the scope. Unless otherwise indicated, the drawings (e.g., cross shading, component arrangements, scale, degrees, etc.) should be read in conjunction with the specification and should be considered an integral part of the entire written description of the invention. As used in the description, the terms “horizontal,” “vertical,” “left,” “right,” “up,” and “down,” and their derived adjectives and adverbs (e.g., “horizontally,” “to the right,” “upward,” etc.) refer only to the orientation of the illustrated structure when the particular drawing is facing the reader. Similarly, the terms “inward” and “outward” generally refer to the orientation of a surface relative to its axis of elongation or rotation, as applicable.

Claims

1. An antenna device (1), characterized in that, include: Dielectric element (2); At least one conductive element (3); An antenna radiator (4) is arranged on the first surface (2a) of the dielectric element (2) and at a distance (D, D') from the conductive element (3), such that a gap (5) is formed between the antenna radiator (4) and the first surface (3a) of the conductive element (3); the conductive element (3) is configured such that the distance (D, D') between the first surface (2a) of the dielectric element (2) and the first surface (3a) of the conductive element (3) is variable; Multiple excitation elements (6) extend at least partially through the gap (5) and are arranged on or near the conductive element (3).

2. The antenna device (1) according to claim 1, characterized in that, The excitation element (6) is arranged along the periphery of the antenna radiator (4).

3. The antenna device (1) according to claim 1, characterized in that, The excitation element (6) is superimposed on the antenna radiator (4).

4. The antenna device (1) according to claim 3, characterized in that, The antenna device includes at least a first pair of excitation elements (6a, 6b) and a second pair of excitation elements (6c, 6d), wherein the first pair of excitation elements (6a, 6b) is decoupled from the second pair of excitation elements (6c, 6d).

5. The antenna device (1) according to claim 3, characterized in that, The antenna device includes at least a first pair of excitation elements (6a, 6b) and a second pair of excitation elements (6c, 6d), wherein the first excitation element (6a) of the first pair of excitation elements (6a, 6b) is coupled to the second excitation element (6b) of the first pair of excitation elements (6a, 6b), and the first excitation element (6c) of the second pair of excitation elements (6c, 6d) is coupled to the second excitation element (6d) of the second pair of excitation elements (6c, 6d). The first pair of excitation elements (6a, 6b) are coupled to the second pair of excitation elements (6c, 6d), the coupling being performed through the first feed network (13a) and exciting a first antenna signal having a first polarization.

6. The antenna device (1) according to claim 5, characterized in that, The first excitation element (6a) in the first pair of excitation elements (6a, 6b) is coupled to the first excitation element (6c) in the second pair of excitation elements (6c, 6d), and the second excitation element (6b) in the first pair of excitation elements (6a, 6b) is coupled to the second excitation element (6d) in the second pair of excitation elements (6c, 6d). The first excitation element (6a) in the first pair of excitation elements (6a, 6b) and the first excitation element (6c) in the second pair of excitation elements (6c, 6d) are coupled to the second excitation element (6b) in the first pair of excitation elements (6a, 6b) and the second excitation element (6d) in the second pair of excitation elements (6c, 6d). The coupling is performed through a second feed network (13b) and excites a second antenna signal with a second polarization orthogonal to the first polarization.

7. The antenna device (1) according to claim 1, characterized in that, Each excitation element (6) is current-, capacitance-, or inductively coupled to at least one other excitation element (6) and / or antenna radiator (4).

8. The antenna device (1) according to claim 6, characterized in that, The first power supply network (13a) and / or the second power supply network (13b) includes a power splitter coupled to the first phase shifter and the second phase shifter, wherein the phase shift of the second phase shifter (6b) in the first pair of excitation elements (6a, 6b) and the phase shift of the second phase shifter (6d) in the second pair of excitation elements (6c, 6d) is 180° relative to the phase of the first excitation element (6a) in the first pair of excitation elements (6a, 6b) and the phase shift of the second phase shifter (6d) in the second pair of excitation elements (6c, 6d).

9. The antenna device (1) according to claim 1, characterized in that, It also includes at least one tunable element (7) for tuning the resonant frequency of the antenna device (1).

10. The antenna device (1) according to claim 9, characterized in that, The resonant frequency is tuned by the tunable element (7) in response to the change in the distance (D, D') between the first surface (2a) of the dielectric element (2) and the first surface (3a) of the conductive element (3).

11. The antenna device (1) according to claim 1, characterized in that, The conductive element (3) is a battery, and the change in distance (D, D') is due to the thermal expansion of the battery.

12. The antenna device (1) according to any one of the preceding claims, characterized in that, The antenna radiator (4) is a patch radiator (8), which optionally includes at least one slot (9).

13. The antenna device (1) according to claim 12, characterized in that, The patch radiator (8) includes two slots (9) that extend parallel to each other in a first direction and are offset in a second direction perpendicular to the first direction.

14. The antenna device (1) according to claim 12, characterized in that, The patch radiator (8) includes four slots (9), each slot (9) extending collinearly with one of the slots (9) and orthogonally to the remaining slots (9), each slot (9) extending from one periphery of the patch radiator (8) toward the center point.

15. The antenna device (1) according to claim 14, characterized in that, The tunable elements (7) of the antenna device (1) are arranged at the periphery of the patch radiator (8), and each tunable element (7) is arranged near one of the slots (9).

16. The antenna device (1) according to claim 12, characterized in that, The size and / or number of slots (9) are configured to generate one or more desired resonant frequencies.

17. The antenna device (1) according to any one of claims 1 to 11, characterized in that, The antenna radiator (4) comprises several separate radiator sections separated by dielectric gaps.

18. A device (10), characterized in that, It includes an antenna device (1), a display (11), and a housing (12) according to any one of claims 1 to 17. The housing includes the dielectric element (2) of the antenna device (1). The conductive element (3) of the antenna device (1) is one of the battery (3b), the printed circuit board (3c), and the device base plate (3d).

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