Dual-band antenna device and mobile user device comprising a dual-band antenna device

Abstract

A compact and efficient dual-band antenna device for mobile user equipment, especially tablets, is provided. The antenna device is a stack of a low-band (LB) resonant structure (RS) and a high-band (HB) RS on a support layer. Each of the LB RS and the HB RS has an open cavity and can be fed using the same or different RF feed lines. The HB RS is arranged at least partially in the open cavity of the first RS such that (i) a side wall of the second RS extends parallel to a side wall of the first RS below a top wall of the first RS, a top wall of the second RS extends parallel to the top wall of the first RS within the open cavity of the first RS in a direction away from the side wall of the first RS, or (ii) the side wall of the second RS extends perpendicular to the side wall of the first RS below the top wall of the first RS, the top wall of the second RS extends parallel to the top wall of the first RS within the open cavity of the first RS.

Description

Technical Field

[0001] This invention generally relates to the field of antennas that radiate radio waves. Specifically, this invention relates to a dual-band antenna device that uses a stack of low-band (LB) and high-band (HB) resonant structures, and a mobile user equipment that includes one or more such dual-band antenna devices. Background Technology

[0002] Mobile user devices such as tablets are becoming increasingly common. To enable wireless communication (e.g., dual-band Wi-Fi), mobile user devices should have one or more antennas. However, developing antennas for tablets with all-metal back covers and large displays is challenging. For tablets, the gap between the edge of the display and the solid metal frame (also known as the bezel) may be only about 1.5 mm. This small opening should be used as a radiating aperture for the antenna, which should be completely ground-level and utilize only the volume below the display. Typical antennas (e.g., monopole antennas or loop antennas) are not suitable for this situation. For example, the total available antenna space for a dual-band Wi-Fi system could be approximately 50 × 15 × 2.5 mm. 3 Even smaller.

[0003] Cavity antennas have been identified as a potential entry point for addressing this design problem, but their fundamental resonant modes, especially higher-order modes (i.e., harmonic modes), inherently have a rather narrow bandwidth (BW). The Wi-Fi 5 GHz band (i.e., the HB from 5170 MHz to 5840 MHz) has a relative bandwidth requirement of 12%, thus at least two resonant modes are expected to be required in the HB. If an LB (2400 MHz to 2483 MHz) resonant antenna located in the volume below the tablet display is chosen as the entry point, the higher-order modes will typically have a narrow bandwidth and be inefficient, at least with a small cavity width (over 20 mm). Regardless, two modes are required at the HB frequency, and in this case, the use of conventional parasitic radiators (such as floating metal strips or slots) is not feasible due to the narrow radiating aperture (less than 1.5 mm) and continuous all-metal back cover. Summary of the Invention

[0004] The purpose of this summary is to present in a simplified form the conceptual choices further described in the following detailed description. This summary is not intended to define the key features of the invention, nor is it intended to limit the scope of the invention.

[0005] The purpose of this invention is to provide a compact and efficient dual-band antenna design for mobile user equipment (especially tablet computers).

[0006] The above objective is achieved through the features of the independent claim in the appended claims. Other embodiments and examples will be apparent from the dependent claims, detailed description, and drawings.

[0007] According to a first aspect, an antenna device is provided, the antenna device comprising a support layer, a first resonant structure (RS), a second RS, and at least one radio frequency (RF) feed line. The first RS is disposed on the support layer and is used to excite at least one LB resonant mode. The first RS includes a sidewall and a top wall, the sidewall and the top wall being conductive. The sidewall and the top wall of the first RS are adjacent to each other such that an open cavity exists beneath the top wall of the first RS. The second RS is disposed on the support layer and is used to excite at least one HB resonant mode. The second RS includes a sidewall and a top wall, the sidewall and the top wall being conductive. The sidewall and the top wall of the second RS are adjacent to each other such that an open cavity exists beneath the top wall of the second RS. The at least one RF feed line is also disposed on the support layer such that it feeds each of the first RS and the second RS. Simultaneously, the second RS is at least partially arranged within the open cavity of the first RS such that: (i) the sidewall of the second RS extends parallel to the sidewall of the first RS below the top wall of the first RS, and the top wall of the second RS extends parallel to the top wall of the first RS in the open cavity of the first RS in a direction away from the sidewall of the first RS; or (ii) the sidewall of the second RS extends perpendicular to the sidewall of the first RS below the top wall of the first RS, and the top wall of the second RS extends parallel to the top wall of the first RS in the open cavity of the first RS. By stacking the first (i.e., LB) RS and the second (i.e., HB) RS in this manner, the antenna device according to the first aspect can be manufactured to be compact in size and efficient in multimode excitation. The antenna device according to the first aspect is particularly suitable for tablet computers, wherein the antenna device can be used as part of a dual-band Wi-Fi system arranged in a volume below the tablet computer display.

[0008] In an exemplary embodiment of the first aspect, the open cavity of at least one of the first RS and the second RS is at least partially filled with a dielectric material. By adding one or more dielectric materials to the open cavity of any one or each of the first RS and the second RS, the LB resonant mode and the HB resonant mode excited by the first RS and the second RS, respectively, can be tuned. Furthermore, if the open cavity of any one or each of the first RS and the second RS is (partially or completely) filled with a dielectric material, the mechanical stability of the entire antenna device can be improved.

[0009] In an exemplary embodiment of the first aspect, the first RS further includes a bottom wall adjacent to the side wall of the first RS below the top wall of the first RS. The bottom wall is conductive and includes an upwardly curved portion that forms the side wall and the top wall of the second RS, respectively. This embodiment may be advantageous or beneficial when it is necessary (e.g., with regard to available production equipment) to manufacture antenna devices by continuous metallization within a single production cycle.

[0010] In an alternative exemplary embodiment of the first aspect, the first RS further includes a bottom wall adjacent to the side wall of the first RS below the top wall of the first RS, and the second RS further includes a bottom wall adjacent to the side wall of the second RS below the top wall of the second RS. The bottom walls of the first RS and the second RS are conductive. In this alternative embodiment, the bottom wall of the first RS includes an upwardly curved portion that forms the top wall, side wall, and bottom wall of the second RS, respectively. Furthermore, the upwardly curved portion is configured such that the bottom wall of the second RS extends through the bottom wall of the first RS. Similarly, this alternative embodiment may be beneficial or advantageous when it is necessary (e.g., with regard to available production equipment) to manufacture antenna devices by continuous metallization within a single production cycle.

[0011] In an exemplary embodiment of the first aspect, the antenna device further includes: (i) at least one shielding element disposed on the support layer inside or outside the open cavity of the first RS, located on each opening side of the open cavity of the first RS adjacent to the sidewall of the first RS, and / or (ii) at least one shielding element disposed on the support layer inside or outside the open cavity of the second RS, located on each opening side of the open cavity of the second RS adjacent to the sidewall of the second RS. Such one or more shielding elements can support appropriate tuning of the frequencies of the LB resonant mode and the HB resonant mode excited by the first RS and the second RS, respectively. Furthermore, the one or more shielding elements can help suppress unwanted modes that may occur within the internal structure and / or environment of the antenna device (e.g., if the antenna device is integrated into a tablet computer, the internal components of the tablet computer surrounding the antenna device may generate modes that could adversely affect the performance of the antenna device).

[0012] In another exemplary embodiment of the first aspect, when the upwardly curved portion of the bottom wall of the first RS forms the top wall and the side wall of the second RS, respectively, at least one shielding element may be arranged on the bottom wall inside the open cavity of the first RS, located on each opening side of the open cavity of the first RS adjacent to the side wall of the first RS, and / or at least one shielding element may be arranged on the support layer inside or outside the open cavity of the second RS, located on each opening side of the open cavity of the second RS adjacent to the side wall of the second RS. Similarly, one or more shielding elements arranged in this way can support proper tuning of the frequencies of the LB resonant mode and the HB resonant mode excited by the first RS and the second RS, respectively. Furthermore, one or more shielding elements can help suppress unwanted modes that may appear in the internal structure and / or environment of the antenna device.

[0013] In another exemplary embodiment of the first aspect, when the upwardly curved portion of the bottom wall of the first RS forms the top wall, the side wall, and the bottom wall of the second RS, respectively, at least one shielding element may be arranged on the bottom wall inside the open cavity of the first RS, located on each opening side of the open cavity of the first RS adjacent to the side wall of the first RS. Similarly, one or more shielding elements thus arranged can support proper tuning of the frequencies of the LB resonant mode and the HB resonant mode excited by the first RS and the second RS, respectively. Furthermore, one or more shielding elements can help suppress unwanted modes that may occur in the internal structure and / or environment of the antenna device.

[0014] In an exemplary embodiment of the first aspect, the top wall of the first RS and the top wall of the second RS are connected to each other by at least one conductive strip (or conductive pin, conductive rod, conductive via). One or more conductive strips may be used to avoid or tune degradation modes at the HB frequency, which would otherwise occur due to coupling between the first RS and the second RS.

[0015] In an exemplary embodiment of the first aspect, the at least one RF feed line includes a first RF feed line for feeding the first RS and a second RF feed line for feeding the second RS. In this embodiment, the first RF feed line extends in or on the support layer and has an end connected to the top wall of the first RS via a conductive pin, and the second RF feed line extends in or on the support layer and has an end connected to the top wall of the second RS via a conductive pin. By using the RF feed lines configured in this way, the first RS and the second RS can be appropriately fed.

[0016] In an exemplary embodiment of the first aspect, the second RF feed line extends from the support layer to the top wall of the second RS, offset from the centerline of the top wall of the second RS by an offset distance. This offset distance is defined based on the at least one HB resonant mode. The off-center second RF feed line enables the second (i.e., HB) RS to efficiently excite the fundamental TM (0.5, 0~1) mode (i.e., quarter-wavelength mode) and the first higher-order TM (0.5, 1~2) mode (i.e., half-wavelength mode) to form a dual resonance to cover Wi-Fi HB.

[0017] In an exemplary embodiment of the first aspect, the top wall of the first RS has a first portion and a second portion adjacent to the first portion. The first portion extends above and parallel to the top wall of the second RS, and the second portion extends further than the top wall of the second RS and bends downward perpendicular to the support layer. This configuration of the top wall reduces the width of the open cavity of the first (i.e., LB) RS, allowing for a more compact antenna device.

[0018] In an exemplary embodiment of the first aspect, the top wall of the second RS has a first portion and a second portion adjacent to the first portion. The first portion extends parallel to the top wall of the first RS inside the open cavity of the first RS, and the second portion extends outside the open cavity of the first RS and curves upward perpendicularly to the support layer. This upwardly curved second portion of the top wall of the second RS can be used to tune the LB resonant mode. Additionally, if one or more conductive strips are used in the antenna device, they can be slightly upwardly tuned to one or more LB resonant modes, which can be compensated for by the upwardly curved second portion of the top wall of the second RS.

[0019] In an exemplary embodiment of the first aspect, at least one portion of the first portion and the (upwardly curved) second portion of the top wall of the second RS serves as a multi-finger structure. This multi-finger structure can further reduce the capacitive loading effect of the second (i.e., HB) RS on the first (i.e., LB) RS and / or further suppress unwanted modes in the antenna device.

[0020] In an exemplary embodiment of the first aspect, the top wall of the second RS serves as a metallic mesh. The mesh-like structure of the top wall of the second RS can further reduce the capacitive loading effect of the second (i.e., HB) RS on the first (i.e., LB) RS and / or help suppress unwanted modes in the antenna device.

[0021] In an exemplary embodiment of the first aspect, the frequency range of the at least one LB resonant mode is 2400 MHz to 2484 MHz, and the frequency range of the at least one HB resonant mode is 5170 MHz to 5835 MHz. These LB and HB frequencies can support the antenna device according to the first aspect to be used efficiently as a dual-band Wi-Fi system in a mobile user device (e.g., a tablet computer).

[0022] In an exemplary embodiment of the first aspect, the at least one LB resonant mode includes a quarter-wavelength LB mode, and the open cavity of the first RS has a width defined based on the quarter-wavelength LB mode. In this embodiment, the at least one HB resonant mode includes a quarter-wavelength HB mode and a half-wavelength HB mode, and the open cavity of the second RS has a length defined based on the half-wavelength HB mode and a width defined based on the quarter-wavelength HB mode and the half-wavelength HB mode. Therefore, by appropriately selecting the dimensions of the first RS and the second RS, the desired quarter-wavelength and half-wavelength LB resonant modes and HB resonant modes can be obtained.

[0023] In an exemplary embodiment of the first aspect, each of the at least one RF feed line serves as a capacitive feed structure. Using a capacitive feed structure (e.g., a microstrip feed line) can help avoid the grounding contacts typically required for one or more RF feed lines of the first RS and the second RS.

[0024] According to a second aspect, a mobile user equipment is provided, including a display, a metal frame, and an antenna device according to a first aspect. The metal frame has a base and sidewalls adjacent to the edges of the base. The metal frame surrounds the display such that a gap exists between the display and the sidewalls of the metal frame. The antenna device is disposed between the base of the metal frame and the display, such that the gap serves as a radiating aperture for at least one LB resonant mode and at least one HB resonant mode. The mobile user equipment can efficiently perform wireless communication, such as dual-band Wi-Fi.

[0025] In an exemplary embodiment of the second aspect, the mobile user equipment further includes a set of shielding elements disposed along the edge of the top wall of the first RS of the antenna device between the antenna device and the display. These shielding elements can support further tuning of the frequencies of the LB and HB resonant modes of the antenna device. Furthermore, they can suppress unwanted (parasitic) modes that may occur in the antenna device environment (i.e., unwanted modes that may be excited in one or more other parts of the mobile user equipment and adversely affect the performance of the antenna device).

[0026] Other features and advantages of the invention will become apparent after reading the following detailed description and viewing the accompanying drawings. Attached Figure Description

[0027] The invention is explained below with reference to the accompanying drawings, in which: Figure 1A and Figure 1B The diagrams show different configurations of a traditional tablet computer, namely: Figure 1A This shows a general view of the tablet computer. Figure 1B It shows in Figure 1A rectangle in A An isometric cross-sectional view of a tablet computer taken within a defined area; Figure 2 A schematic isometric view of an open cavity antenna for use in a tablet computer, provided by the prior art, is shown. Figure 3 A schematic isometric view of a dual-cavity antenna for use in a tablet computer, provided by the prior art, is shown. Figure 4A and Figure 4BDifferent schematic diagrams of the antenna device provided in the first exemplary embodiment are shown, namely: Figure 4A A general isometric view of the antenna device arranged in the tablet computer is shown. Figure 4B A cross-sectional side view of the antenna device is shown; Figure 5 This schematically illustrates how the shielding element can be used in conjunction with the antenna device provided in the first exemplary embodiment; Figure 6 A schematic isometric view of an antenna device provided in a second exemplary embodiment is shown, wherein the open cavity of at least one of the low-band (LB) resonant structure (RS) and the high-band (HB) RS is filled with dielectric material. Figure 7 A schematic isometric view of an antenna device provided in a third exemplary embodiment is shown, wherein the top walls of the LB RS and HB RS are interconnected by at least one conductive strip or conductive pin; Figure 8 A schematic isometric view of an antenna device provided in a fourth exemplary embodiment is shown, wherein the HB RS includes a top wall having an upwardly curved portion; Figure 9 A schematic isometric view of an antenna device provided in a fifth exemplary embodiment is shown, wherein the LB RS includes a top wall having a downwardly curved portion; Figure 10 A schematic isometric view of an antenna device provided in a sixth exemplary embodiment is shown, wherein the sidewalls and top wall of the HB RS are formed by the bottom wall of the LB RS; Figure 11 A schematic isometric view of an antenna device provided in a seventh exemplary embodiment is shown, wherein the sidewalls, top wall, and bottom wall of the HB RS are formed by the bottom wall of the LB RS; Figures 12A to 12C The following are different schematic diagrams of an antenna device with a single RF feed line provided in the eighth exemplary embodiment: Figure 12A A general isometric view of the antenna device is shown. Figure 12B A partial isometric view of the antenna equipment is shown (excluding the top wall of the LB RS). Figure 12C A cross-sectional isometric view of an antenna device arranged in a tablet computer is shown. Figure 13A and Figure 13B A different schematic diagram of an antenna device with another single RF feed line provided in the ninth exemplary embodiment is shown, namely: Figure 13A A general isometric view of the antenna device is shown. Figure 13BA partial isometric view of the antenna equipment is shown, excluding the top wall of the LB RS; Figure 14 This is shown as simulated on the test platform. Figures 12A to 12C The relationship between impedance matching (S11 parameters) and frequency of antenna equipment; Figure 15 This is shown as simulated on the test platform. Figures 12A to 12C The relationship between the overall efficiency and radiation efficiency of antenna equipment and frequency; Figures 16A to 16C The antenna device provided in the tenth exemplary embodiment is schematically shown in an LB resonant mode. Figure 16A ) and two HB resonance modes ( Figure 16B and Figure 16C The direction and amplitude of the electric field under ( ). Detailed Implementation

[0028] Various embodiments of the invention have been described in further detail with reference to the accompanying drawings. However, the invention may be embodied in many other forms and should not be construed as limited to any particular structure or function disclosed in the following description. Rather, these embodiments are provided to make the description of the invention detailed and complete.

[0029] As will be apparent to those skilled in the art from the detailed description, the scope of this invention includes any embodiment of the invention disclosed herein, whether implemented independently or in combination with any other embodiment of the invention. For example, the apparatus disclosed herein can be implemented in practice using any number of the embodiments provided herein. Furthermore, it should be understood that any embodiment of the invention can be implemented using one or more features set forth in the appended claims.

[0030] As used herein, the term “exemplary” means “for illustration”. Unless otherwise stated, any embodiment described herein as “exemplary” should not be construed as preferred or having an advantage over other embodiments.

[0031] For convenience, any positioning terms such as "left," "right," "top," "bottom," "above," "below," "upper," "lower," "horizontal," and "vertical" may be used herein to describe the relationship of an element or feature to one or more other elements or features, as shown in the accompanying drawings. It is clear that positioning terms are intended to encompass the different orientations of the apparatus disclosed herein, as well as one or more orientations depicted in the drawings. For example, if the apparatus in the figures is envisioned to be rotated 90 degrees clockwise, the elements or features described as "left" and "right" relative to other elements or features would be oriented "above" and "below" the other elements or features, respectively. Therefore, the positioning terms used herein should not be construed as any limitation on the invention.

[0032] Furthermore, although numerical terms such as "first," "second," etc., may be used herein to describe various embodiments, elements, or features, it should be understood that these embodiments, elements, or features should not be limited by such numerical terms. The numerical terms used herein are merely for distinguishing one embodiment, element, or feature from another. For example, without departing from the teachings of the invention, the first resonant structure (RS) discussed below may be referred to as the second RS, and vice versa.

[0033] As used in the embodiments disclosed herein, an antenna device can refer to a device for radiating and receiving radio waves. Radio waves can refer to different types of electromagnetic radiation occurring in different frequency bands of the radio spectrum (e.g., in the centimeter-wave (cm-wave) and millimeter-wave (mm-wave) bands). For example, radio waves have been used for wireless communications, such as point-to-point communication, inter-satellite links, and point-to-multipoint communication. However, the applications of radio waves are not limited to wireless communications; they can also be used for applications such as vehicle navigation and control (air, land, or sea), road obstacle detection, etc. Therefore, the antenna devices according to the embodiments disclosed herein can be used in the same application scenarios as radio waves. More specifically, antenna equipment can be implemented as (mobile) user equipment or part of user equipment (UE), which can refer to wireless customer premises equipment (CPE) (e.g., wireless routers, switches, etc.), mobile devices, mobile stations, terminals, user units, mobile phones, cellular phones, smartphones, cordless phones, personal digital assistants (PDAs), wireless communication devices, laptops, tablets, single-board computers (SBCs) (e.g., Raspberry Pi devices), gaming devices, netbooks, smartbooks, ultrabooks, medical devices or medical equipment, biometric sensors, wearable devices (e.g., smartwatches, smart glasses, smart wristbands, etc.), entertainment devices (e.g., audio players, video players, etc.), vehicle components or sensors (e.g., driver assistance systems), smart meters / sensors, unmanned vehicles (e.g., industrial robots, quadcopters, etc.) and their components (e.g., autonomous vehicle computers), industrial manufacturing equipment, global positioning system (GPS) devices, internet-of-things (IoT) devices, and industrial IoT (industrial IoT). IoT (IIoT) devices, machine-type communication (MTC) devices, a group of massive IoT (MIoT) or massive MTC (mMTC) devices / sensors, or any other suitable device that operates using radio waves. In some embodiments, UE may refer to at least two juxtaposed and interconnected UEs as defined herein.

[0034] Figure 1A and Figure 1BDifferent schematic diagrams of a conventional tablet computer 100 are shown. More specifically, Figure 1A A general view of the tablet computer 100 is shown. Figure 1B It shows in Figure 1A rectangle in A A cross-sectional isometric view of a tablet computer 100 taken within a defined area. The tablet computer 100 includes a metal frame or housing 102 and a display 104, with the metal frame 102 surrounding the display 104 such that a gap exists between the metal frame 102 and the display 104. Figure 1A and Figure 1B (Not shown in the image). The gap may be covered with a dielectric coating 106, such as a glass cover or any one or more oxide layers (e.g., one or more indium tin oxide (ITO) layers), as should be known to those skilled in the art. In the illustrated exemplary case, the gap is approximately 1.5 mm in size. The volume or cavity 108 beneath the display 104 may be used for one or more antennas for wireless communication, and the gap may serve as a narrow radiating aperture for one or more antennas.

[0035] Figure 2 A schematic isometric view of an open cavity antenna 200, available in the prior art, for use with a tablet computer 100, is shown. Figure 2 In this design, an open cavity antenna 200 is assumed to be mounted on a metal frame 102 below a display 104. The open cavity antenna 200 includes sidewalls 202 and a top wall 204, which are adjacent to each other, such that an open cavity 206 exists beneath the top wall 204. The open cavity antenna 200 is used to pass through the gap between the metal frame 102 and the display 104. g To activate one mode in Wi-Fi LB and multiple modes in Wi-Fi HB.

[0036] Although the open cavity antenna 200 exhibits good matching in the HB region, it also excites a variety of undefined HB resonant modes, and the radiation efficiency of the open cavity antenna 200 in the HB region is significantly lower than that in the LB region. It should be noted that the HB resonant mode is actually a combination of one or more LB harmonic modes and unintended resonant modes excited in the environment of the open cavity antenna 200 (i.e., by other components of the tablet 100).

[0037] Figure 3 A schematic isometric view of a dual-cavity antenna 300 available in the prior art for use in a tablet computer 100 is shown. Again, it is assumed that the dual-cavity antenna 300 is arranged on a metal frame 102 below the display 104. Figure 3(Not shown in the image). The dual-cavity antenna 300 includes two resonant cavities 302 (for Wi-Fi LB) and 304 (for Wi-Fi HB), which are arranged adjacent to each other and each has its own RF feed line 306 and 308. Disadvantages of the dual-cavity antenna 300 include a relatively long overall antenna length (approximately 75 mm) and a limited bandwidth (BW) (each of the resonant cavities 302 and 300 can provide a single resonance). Furthermore, the dual-cavity antenna 300 is not optimal for single-feed operation.

[0038] The exemplary embodiments disclosed herein provide a technical solution that can mitigate or even eliminate the aforementioned disadvantages unique to the prior art. More specifically, the technical solution disclosed herein relates to a compact and efficient dual-band antenna device for mobile user equipment (especially tablet computers). The antenna device provided by the present invention serves as a stack of an LB resonant structure (RS) and an HB RS on a support layer. Each RS in the LB RS and HB RS has an open cavity and can be fed using the same RF feed line or different RF feed lines. The HB RS is at least partially arranged in the open cavity of the first RS such that: (i) the sidewall of the second RS extends parallel to the sidewall of the first RS below the top wall of the first RS, and the top wall of the second RS extends parallel to the top wall of the first RS in the open cavity of the first RS in a direction away from the sidewall of the first RS, or (ii) the sidewall of the second RS extends perpendicular to the sidewall of the first RS below the top wall of the first RS, and the top wall of the second RS extends parallel to the top wall of the first RS in the open cavity of the first RS.

[0039] Figure 4A and Figure 4B Different schematic diagrams of the antenna device 400 provided in the first exemplary embodiment are shown. More specifically, Figure 4A A general isometric view of an antenna device 400 arranged within a metal frame 402 below a display 404 of a tablet computer (such as tablet computer 100) is shown. Figure 4B A cross-sectional side view of the antenna device 400 is shown. The antenna device 400 includes a first (LB) RS and a second (HB) RS stacked on a support layer 406. It should be noted that the support layer 406 may be a PCB or flexible printed circuit (FPC) mounted within a metal frame 402, or it may be part of the metal frame 402 itself.

[0040] The first RS includes a sidewall 408 and a top wall 410, both of which are made of a conductive material (e.g., metal). The sidewall 408 and top wall 410 of the first RS are adjacent to each other, such that an open cavity 412 exists below the top wall 410 of the first RS (see...). Figure 4B The first RS is fed using an RF feed line, which can be used to extend in or on the support layer 406 (e.g., Figure 4A and Figure 4B As shown), and has an end connected to the top wall 410 of the first RS via conductive pin 414, for example, inside an open cavity 412. The dimensions of the open cavity 412 support the excitation of specific one or more LB resonant modes when the first RS is fed through its RF feed line. For example, the open cavity 412 may have a length equal to 50 mm (in direction 2), a width equal to 15 mm (in direction 1), and a height equal to 2.7 mm (in direction 3). For LB resonant modes, it may correspond to a frequency range of 2400 MHz to 2484 MHz.

[0041] The second RS includes a sidewall 416 and a top wall 418, both of which are made of a conductive material (e.g., metal). The conductive material of the sidewall 416 and top wall 418 may be the same as or different from the conductive material of the sidewall 408 and top wall 410. The sidewall 416 and top wall 418 of the second RS are adjacent to each other, such that an open cavity 420 exists below the top wall 418 of the second RS (see...). Figure 4B The second RS is fed via an RF feed line, which can be implemented in the same or similar manner as the RF feed line of the first RS, i.e., the RF feed line can be used to extend in or on the support structure 406 (e.g., Figure 4A and Figure 4B As shown), and has an end connected to the top wall 418 of the second RS via conductive pin 422, for example, inside the open cavity 420 of the second RS. The dimensions of the open cavity 420 support the excitation of specific one or more HB resonant modes when the second RS is fed through its RF feed line. For example, the open cavity 420 may have a length of 50 mm (in direction 2), a width of 8 mm (in direction 1), and a height of 1 mm (in direction 3). For HB resonant modes, it may correspond to a frequency range of 5170 MHz to 5835 MHz.

[0042] from Figure 4A and Figure 4BIt can be seen that the second RS is completely disposed within the open cavity 412 of the first RS. In this case, the sidewall 416 of the second RS extends parallel to the sidewall 408 of the first RS below the top wall 410 of the first RS, and the top wall 418 of the second RS extends parallel to the top wall 410 of the first RS in a direction away from the sidewall 408 of the first RS within the open cavity 412 of the first RS (i.e., the top wall 418 of the second RS extends to the right). Furthermore, the first RS and the second RS are disposed within the metal frame 402 such that they face the gap between the metal frame 402 and the display 404. g Excite the LB resonant mode and the HB resonant mode.

[0043] In another embodiment, the first RS and the second RS may be orthogonally arranged. In other words, the sidewall 416 of the second RS may extend below the top wall 410 of the first RS perpendicular to the sidewall 408 of the first RS, while the top wall 418 of the second RS may extend within the open cavity 412 of the first RS parallel to the top wall 410 of the first RS. (See reference...) Figure 4B Orthogonal orientation means that the top wall 418 of the second RS can extend perpendicularly to the plane of the figure, either toward or away from the observer.

[0044] Another embodiment is possible, wherein the open cavity 420 of the second RS is substantially shorter than the open cavity 412 of the first RS. For example, the length of the open cavity 412 of the first RS may be 45 mm (in Figure 4A (in direction 2), while the length of the open cavity 420 of the second RS can be 34 mm (in Figure 4A (Direction 2 in the middle). In this embodiment, an RF feed line with a ground connection (as discussed above) or a feed line with a capacitive open end, or a combination thereof, can be used. In this case, the wide bandwidth of the second RS is implemented as a hybrid resonant mode configuration, wherein the HB fundamental frequency resonant mode of the second RS is combined with the harmonic LB resonant mode of the first RS.

[0045] Figure 5The diagram illustrates how the shielding element 500 can be used in conjunction with the antenna device 400. More specifically, one or more shielding elements 500 may be disposed on the support layer 406 inside (i.e., below the top wall 410) or outside (i.e., not below the top wall 410) of the open cavity 412 of the first RS, on each opening side of the open cavity 412 adjacent to the side wall 408 (i.e., on the left and right sides of the open cavity 412). Additionally or alternatively, one or more shielding elements 500 (different from or similar to the shielding elements used for the first RS) may be disposed on the support layer 406 inside (i.e., below the top wall 418) or outside (i.e., not below the top wall 418) of the open cavity 420 of the second RS, on each opening side of the open cavity 420 adjacent to the side wall 416 (i.e., on the left and right sides of the open cavity 420). If the shielding element 500 is arranged outside the open cavities 412 and 420, the distance between the shielding element 500 and the first RS and the second RS can be selected. a This is to properly tune the frequencies of the LB resonant mode and the HB resonant mode, which are excited by the first RS and the second RS, respectively. For example, considering the exemplary dimensions of the open cavities 412 and 420 described above, the distance... a It can be approximately 9 mm. The shielding element 500 can be made of a conductive material (e.g., a conductive pad); they can even be configured as protrusions of the support layer 406 or the metal frame 402. Additionally, if desired and depending on the specific application of the antenna device 400, the shielding element (or conductive pad) 500 can also be connected to the display 404.

[0046] Figure 6 A schematic isometric view of an antenna device 600 provided in a second exemplary embodiment is shown. Again, it is assumed that the antenna device 600 is arranged within a metal frame 602 below the display 604 of a tablet computer (such as tablet computer 100). The antenna device 600 includes a stack of first (LB) RS and second (HB) RS on a support layer 606, which may be a PCB or FPC mounted within the metal frame 602, or it may be part of the metal frame 602 itself.

[0047] Similar to the first RS of antenna device 400, the first RS of antenna device 600 includes a sidewall 608 and a top wall 610, both made of a conductive material (e.g., metal) and adjacent to each other, such that an open cavity 612 exists below the top wall 610. For example, the first RS of antenna device 600 can use an RF feed line ( Figure 6The open cavity 612 (not shown) is fed to the RF feed line, which serves as the RF feed line for the first RS in the antenna device 400. The open cavity 612 may have a similar size to the open cavity 412 and may be used to excite one or more LB resonant modes, similar to the modes discussed above with reference to the open cavity 412.

[0048] Similar to the second RS of antenna device 400, the second RS of antenna device 600 includes a sidewall 614 and a top wall 616, both made of a conductive material (e.g., metal) and adjacent to each other, such that an open cavity 618 exists below the top wall 616. The second RS can use RF feed lines ( Figure 6 The RF feed line (not shown) is fed to the second RS in antenna device 400 in the same or similar manner. The open cavity 618 may have a similar size to the open cavity 420 and may be used to excite one or more HB resonant modes, similar to the modes discussed above with reference to the open cavity 420.

[0049] In the second exemplary embodiment, the second RS is again fully disposed within the open cavity 612 of the first RS. More specifically, the sidewall 614 of the second RS extends parallel to the sidewall 608 of the first RS below the top wall 610 of the first RS, and the top wall 616 of the second RS extends parallel to the top wall 610 of the first RS in a direction away from the sidewall 608 of the first RS within the open cavity 612 of the first RS (i.e., the top wall 616 of the second RS extends to the right). Furthermore, the first RS and the second RS of the antenna device 600 are disposed within the metal frame 602 such that they are positioned toward the gap between the metal frame 602 and the display 604. g Excite the LB resonant mode and the HB resonant mode.

[0050] The difference between antenna device 600 and antenna device 400 is that the open cavity 612 of the first RS is filled with a dielectric material 620. The dielectric material 620 can be selected based on one or more LB resonant modes that will be excited by the first RS of antenna device 600. For example, if open cavities 612 and 618 have the same dimensions as in the exemplary numerical example described above, the dielectric material 620 can have a dielectric constant of 3.8. It should be noted that, depending on the specific application, open cavity 618 can also be filled with the same or different dielectric materials. Furthermore, another embodiment is possible, in which open cavity 612 is empty, while open cavity 618 is filled with a certain dielectric material.

[0051] Figure 7A schematic isometric view of an antenna device 700 provided in a third exemplary embodiment is shown. Again, it is assumed that the antenna device 700 is arranged within a metal frame 702 below the display 704 of a tablet computer (such as tablet computer 100). The antenna device 700 includes a stack of first (LB) RS and second (HB) RS on a support layer 706, which may be a PCB or FPC mounted within the metal frame 702, or it may be part of the metal frame 702 itself.

[0052] Similar to the first RS of antenna devices 400 and 600, the first RS of antenna device 700 includes a sidewall 708 and a top wall 710, both made of a conductive material (e.g., metal) and adjacent to each other, such that an open cavity 712 exists below the top wall 710. For example, the first RS of antenna device 700 can use an RF feed line ( Figure 7 The open cavity 712 (not shown) is fed to the RF feed line, which serves as the RF feed line for the first RS in the antenna device 400. The open cavity 712 may have a similar size to the open cavity 412 and may be used to excite one or more LB resonant modes, similar to the modes discussed above with reference to the open cavity 412.

[0053] Similar to the second RS of antenna devices 400 and 600, the second RS of antenna device 700 includes a sidewall 714 and a top wall 716, both made of a conductive material (e.g., metal) and adjacent to each other, such that an open cavity 718 exists below the top wall 716. The second RS can use RF feed lines ( Figure 7 The RF feed line (not shown) is fed in the same or similar manner as the RF feed line of the second RS in antenna device 400. The open cavity 718 may have a similar size to the open cavity 420 and may be used to excite one or more HB resonant modes, similar to the modes discussed above with reference to open cavity 420.

[0054] In a third exemplary embodiment, the second RS is again fully disposed within the open cavity 712 of the first RS. More specifically, the sidewall 714 of the second RS extends parallel to the sidewall 708 of the first RS below the top wall 710 of the first RS, and the top wall 716 of the second RS extends parallel to the top wall 710 of the first RS in a direction away from the sidewall 708 of the first RS within the open cavity 712 of the first RS (i.e., the top wall 716 of the second RS extends to the right). Furthermore, the first RS and the second RS of the antenna device 700 are disposed within a metal frame 702 such that they are positioned toward the gap between the metal frame 702 and the display 704. g Excite the LB resonant mode and the HB resonant mode.

[0055] The antenna device 700 differs from antenna devices 400 and 600 in that the top wall 710 of the first RS and the top wall 716 of the second RS are interconnected by one or more conductive (short-circuit) strips or pins 720. For example, one or more conductive strips 720 may extend from the edge of the upper surface of the top wall 716 of the second RS toward the edge of the lower surface of the top wall 710 of the first RS. To properly tune the coupled resonant mode (i.e., the fourth LB mode), one or more conductive strips 720 may be arranged at the point of maximum E-field in the fourth LB mode. The one or more conductive strips 720 may also be frequency selective (e.g., by using a simple LC filter that is open-circuited as the first LB mode).

[0056] It should be noted that, if necessary, the third embodiment can be combined with the second embodiment. In other words, any one or each of the open cavities 712 and 718 can be filled with (different or the same) dielectric material.

[0057] Figure 8 A schematic isometric view of an antenna device 800 provided in a fourth exemplary embodiment is shown. Again, it is assumed that the antenna device 800 is arranged within a metal frame 802 below the display 804 of a tablet computer (such as tablet computer 100). The antenna device 800 includes a stack of first (LB) RS and second (HB) RS on a support layer 806, which may be a PCB or FPC mounted within the metal frame 802, or it may be part of the metal frame 802 itself.

[0058] Similar to the first RS of antenna devices 400, 600, and 700, the first RS of antenna device 800 includes a sidewall 808 and a top wall 810, both made of a conductive material (e.g., metal) and adjacent to each other, such that an open cavity 812 exists below the top wall 810. For example, the first RS of antenna device 800 can use an RF feed line ( Figure 8 The open cavity 812 (not shown) is fed to the RF feed line, which serves as the RF feed line for the first RS in the antenna device 400. The open cavity 812 may have a similar size to the open cavity 412 and may be used to excite one or more LB resonant modes, similar to the modes discussed above with reference to the open cavity 412.

[0059] Similar to the second RS of antenna devices 400, 600, and 700, the second RS of antenna device 800 includes a sidewall 814 and a top wall 816, both made of a conductive material (e.g., metal) and adjacent to each other, such that an open cavity 818 exists below the top wall 816. The second RS can use RF feed lines ( Figure 8The RF feed line (not shown) is fed in the same or similar manner as the RF feed line of the second RS in antenna device 400. The open cavity 818 may have a similar size to the open cavity 420 and may be used to excite one or more HB resonant modes, similar to the modes discussed above with reference to open cavity 420.

[0060] In the fourth exemplary embodiment, the second RS is again fully disposed within the open cavity 812 of the first RS, and the first RS and the second RS are interconnected by one or more conductive strips 820 (similar to conductive strips 820). More specifically, the sidewall 814 of the second RS extends parallel to the sidewall 808 of the first RS below the top wall 810 of the first RS, and the top wall 816 of the second RS extends parallel to the top wall 810 of the first RS in a direction away from the sidewall 808 of the first RS within the open cavity 812 of the first RS (i.e., the top wall 816 of the second RS extends to the right). Furthermore, the first RS and the second RS of the antenna device 800 are disposed within a metal frame 802 such that they are positioned toward the gap between the metal frame 802 and the display 804. g Excite the LB resonant mode and the HB resonant mode.

[0061] The antenna device 800 differs from antenna devices 400, 600, and 700 in that the top wall 816 of the second RS includes an upwardly curved portion 822 outside the open cavity 812 of the first RS. The upwardly curved portion 822 can be made into a multi-finger structure or any other sliced ​​metal structure, the configuration of which depends on how much the capacitive load effect of the second RS on the first RS should be reduced. Additionally or alternatively, another (non-curved) portion of the top wall 816 of the second RS can be a multi-finger structure or any other sliced ​​metal structure.

[0062] It should be noted that, if necessary, the fourth embodiment can be combined with the second embodiment. In other words, any one or each of the open cavities 812 and 818 can be filled with (different or the same) dielectric material. Furthermore, another embodiment is possible, in which the antenna device 800 does not include any one or more conductive strips 820.

[0063] Figure 9 A schematic isometric view of an antenna device 900 provided in a fifth exemplary embodiment is shown. Again, it is assumed that the antenna device 900 is arranged within a metal frame 902 below a display 904 of a tablet computer (such as tablet computer 100). The antenna device 900 includes a stack of first (LB) RS and second (HB) RS on a support layer 906, which may be a PCB or FPC mounted within the metal frame 902, or it may be part of the metal frame 902 itself.

[0064] Similar to the first RS of antenna devices 400, 600 to 800, the first RS of antenna device 900 includes a sidewall 908 and a top wall 910, both made of a conductive material (e.g., metal) and adjacent to each other, such that an open cavity 912 exists below the top wall 910. For example, the first RS of antenna device 900 can use an RF feed line ( Figure 9 (Not shown) is fed, and this RF feed line serves as the RF feed line for the first RS in antenna device 400. Open cavity 912 may have a similar size to open cavity 412 and may be used to excite one or more LB resonant modes, similar to the modes discussed above with reference to open cavity 412.

[0065] Similar to the second RS of antenna devices 400, 600 to 800, the second RS of antenna device 900 includes a sidewall 914 and a top wall 916, both made of a conductive material (e.g., metal) and adjacent to each other, such that an open cavity 918 exists below the top wall 916. The second RS can use RF feed lines ( Figure 9 The RF feed line (not shown) is fed in the same or similar manner as the RF feed line of the second RS in antenna device 400. The open cavity 918 may have a similar size to the open cavity 420 and may be used to excite one or more HB resonant modes, similar to the modes discussed above with reference to open cavity 420.

[0066] In the fifth exemplary embodiment, the second RS is again fully disposed within the open cavity 912 of the first RS, and the first RS and the second RS are interconnected by one or more conductive strips 920 (similar to conductive strip 720). More specifically, the sidewall 914 of the second RS extends parallel to the sidewall 908 of the first RS below the top wall 910 of the first RS, and the top wall 916 of the second RS extends parallel to the top wall 910 of the first RS in a direction away from the sidewall 908 of the first RS within the open cavity 912 of the first RS (i.e., the top wall 916 of the second RS extends to the right). Furthermore, the first RS and the second RS of the antenna device 900 are disposed within a metal frame 902 such that they are positioned toward the gap between the metal frame 902 and the display 904. g Excite the LB resonant mode and the HB resonant mode.

[0067] The antenna device 900 differs from antenna devices 400, 600 to 800 in that the top wall 910 of the first RS includes a downwardly curved portion 922 extending perpendicularly to the support layer 906. The shape and size of the portion 922 can be selected to achieve the desired compactness of the antenna device 900 while still providing multimode (LB and HB) excitation.

[0068] It should be noted that, if desired, the fifth embodiment can be combined with the second embodiment, for example. In other words, any one or each of the open cavities 912 and 918 can be filled with (different or the same) dielectric material. Furthermore, another embodiment is possible, in which the antenna device 900 does not include any one or more conductive strips 920.

[0069] Figure 10 A schematic isometric view of an antenna device 1000 provided in a sixth exemplary embodiment is shown. Again, it is assumed that the antenna device 1000 is arranged within a metal frame 1002 below the display 1004 of a tablet computer (such as tablet computer 100). The antenna device 1000 includes a stack of first (LB) RS and second (HB) RS on a support layer 1006, which may be a PCB or FPC mounted within the metal frame 1002, or it may be part of the metal frame 1002 itself.

[0070] Similar to the first RS of antenna devices 400, 600 to 900, the first RS of antenna device 1000 includes a sidewall 1008 and a top wall 1010, both made of a conductive material (e.g., metal) and adjacent to each other, such that an open cavity 1012 exists below the top wall 1010. For example, the first RS of antenna device 1000 can use an RF feed line ( Figure 10 The open cavity 1012 (not shown) is fed to the open cavity 412, and this RF feed line serves as the RF feed line for the first RS in the antenna device 400. The open cavity 1012 may have a similar size to the open cavity 412 and may be used to excite one or more LB resonant modes, similar to the modes discussed above with reference to the open cavity 412.

[0071] Similar to the second RS of antenna devices 400, 600 to 900, the second RS of antenna device 1000 includes a sidewall 1014 and a top wall 1016, both made of a conductive material (e.g., metal) and adjacent to each other, such that an open cavity 1018 exists below the top wall 1016. The second RS can use RF feed lines ( Figure 10 The RF feed line (not shown) is fed in the same or similar manner as the RF feed line of the second RS in antenna device 400. The open cavity 1018 may have a similar size to the open cavity 420 and may be used to excite one or more HB resonant modes, similar to the modes discussed above with reference to the open cavity 420.

[0072] In the sixth exemplary embodiment, the second RS is again fully disposed within the open cavity 1012 of the first RS, and the first RS and the second RS are interconnected by one or more conductive strips 1020 (similar to conductive strip 720). More specifically, the sidewall 1014 of the second RS extends parallel to the sidewall 1008 of the first RS below the top wall 1010 of the first RS, and the top wall 1016 of the second RS extends parallel to the top wall 1010 of the first RS within the open cavity 1012 of the first RS in a direction away from the sidewall 1008 of the first RS (i.e., the top wall 1016 of the second RS extends to the right). Furthermore, the first RS and the second RS of the antenna device 1000 are disposed within a metal frame 1002 such that they face the gap between the metal frame 1002 and the display 1004. g Excite the LB resonant mode and the HB resonant mode.

[0073] The antenna device 1000 differs from antenna devices 400, 600 to 900 in that the first RS also includes a bottom wall 1022, which is curved to form the side walls 1014 and top wall 1016 of the second RS. In other words, the first RS and the second RS of the antenna device 1000 are implemented as a single or monolithic structure. It should be noted that the bottom wall 1022 of the first RS in the antenna device 1000 can be grounded to the metal frame 1002 of the tablet computer via one or more conductive pads. Additionally or alternatively, the top wall 1010 of the first RS in the antenna device 1000 can be grounded to the display 1004 via one or more conductive pads.

[0074] It should be noted that, if desired, the sixth embodiment can be combined with the second embodiment, for example. In other words, any one or each of the open cavities 1012 and 1018 can be filled with (different or the same) dielectric material. Furthermore, another embodiment is possible, in which the antenna device 1000 does not include any one or more conductive strips 1020.

[0075] Figure 11 A schematic isometric view of an antenna device 1100 provided in a seventh exemplary embodiment is shown. Again, it is assumed that the antenna device 1100 is arranged within a metal frame 1102 below the display 1104 of a tablet computer (such as tablet computer 100). The antenna device 1100 includes a stack of first (LB) RS and second (HB) RS on a support layer 1106, which may be a PCB or FPC mounted within the metal frame 1102, or it may be part of the metal frame 1102 itself.

[0076] Similar to the first RS of antenna devices 400, 600 to 1000, the first RS of antenna device 1100 includes a sidewall 1108 and a top wall 1110, both made of a conductive material (e.g., metal) and adjacent to each other, such that an open cavity 1112 exists below the top wall 1110. For example, the first RS of antenna device 1100 can use an RF feed line ( Figure 11 (Not shown) is fed, and this RF feed line serves as the RF feed line for the first RS in antenna device 400. Open cavity 1112 may have a similar size to open cavity 412 and may be used to excite one or more LB resonant modes, similar to the modes discussed above with reference to open cavity 412.

[0077] Similar to the second RS of antenna devices 400, 600 to 1000, the second RS of antenna device 1100 includes a sidewall 1114 and a top wall 1116, both made of a conductive material (e.g., metal) and adjacent to each other, such that an open cavity 1118 exists below the top wall 1116. The second RS can use RF feed lines ( Figure 11 The RF feed line (not shown) is fed in the same or similar manner as the RF feed line of the second RS in antenna device 400. The open cavity 1118 may have a similar size to the open cavity 420 and may be used to excite one or more HB resonant modes, similar to the modes discussed above with reference to open cavity 420.

[0078] In the sixth exemplary embodiment, the second RS is again fully disposed within the open cavity 1112 of the first RS. More specifically, the sidewall 1114 of the second RS extends parallel to the sidewall 1108 of the first RS below the top wall 1110 of the first RS, and the top wall 1116 of the second RS extends parallel to the top wall 1110 of the first RS within the open cavity 1112 of the first RS in a direction away from the sidewall 1108 of the first RS (i.e., the top wall 1116 of the second RS extends to the right). Furthermore, the first RS and the second RS of the antenna device 1100 are disposed within the metal frame 1102 such that they face the gap between the metal frame 1102 and the display 1104. g Excite the LB resonant mode and the HB resonant mode.

[0079] The antenna device 1100 differs from antenna devices 400, 600 to 1000 in that the first RS further includes a bottom wall 1120, and the second RS further includes a bottom wall 1122. The bottom wall 1120 is curved to form the side wall 1114, top wall 1116, and bottom wall 1122 of the second RS, respectively. In other words, the first RS and second RS of the antenna device 1100 are again implemented as a single or monolithic structure. It should be noted that, unlike the second RS of antenna device 1010, the second RS of antenna device 1100 is "suspended" above the bottom wall 1120 of the first RS. Similar to antenna device 1000, the bottom wall 1120 of the first RS in antenna device 1100 can be grounded to the metal frame 1102 of the tablet computer via one or more conductive pads. Additionally or alternatively, the top wall 1110 of the first RS in antenna device 1100 can be grounded to the display 1104 via one or more conductive pads.

[0080] If desired, the seventh embodiment may be combined with, for example, the second and / or third embodiments. In other words, any one or each of the open cavities 1112 and 1118 may be filled with (different or the same) dielectric material, and / or the antenna device 1100 may also include one or more conductive strips (similar to conductive strip 720) interconnecting the top walls 1110 and 1116.

[0081] Figures 12A to 12C Different schematic diagrams of the antenna device 1200 provided in the eighth exemplary embodiment are shown. More specifically, Figure 12A A general isometric view of antenna device 1200 is shown. Figure 12B An isometric view of a portion of the antenna device 1200 (see explanation below) is shown. Figure 12C A cross-sectional isometric view of an antenna device 1200 arranged in a tablet computer is shown.

[0082] Similar to the first RS of antenna devices 400, 600 to 1100, the first RS of antenna device 1200 includes a sidewall 1202 and a top wall 1204, both made of a conductive material (e.g., metal) and adjacent to each other, such that an open cavity 1206 exists beneath the top wall 1204. The open cavity 1206 may have a similar size to the open cavity 412 and may be used to excite one or more LB resonant modes, similar to those discussed above with reference to the open cavity 412.

[0083] Similar to the second RS of antenna devices 400, 600 to 1100, the second RS of antenna device 1200 includes a sidewall 1208 and a top wall 1210, both made of a conductive material (e.g., metal) and adjacent to each other, such that an open cavity 1212 exists below the top wall 1210. The open cavity 1212 may have a similar size to the open cavity 420 and may be used to excite one or more HB resonant modes, similar to the modes discussed above with reference to the open cavity 420.

[0084] In the eighth exemplary embodiment, the second RS is again fully disposed within the open cavity 1206 of the first RS. More specifically, the sidewall 1208 of the second RS extends parallel to the sidewall 1202 of the first RS below the top wall 1204 of the first RS, and the top wall 1210 of the second RS extends parallel to the top wall 1204 of the first RS within the open cavity 1206 of the first RS in a direction away from the sidewall 1202 of the first RS (i.e., referring to...). Figure 12C The top wall 1210 of the second RS extends to the right.

[0085] Similar to antenna device 1000, the first RS of antenna device 1200 also includes a bottom wall 1214, which is curved to form the side walls 1208 and top wall 1210 of the second RS. In other words, the first RS and the second RS of antenna device 1200 are implemented as a single or monolithic structure.

[0086] Meanwhile, antenna device 1200 differs from antenna devices 400, 600 to 1100 in that each of the first RS and the second RS is fed via a single RF feed line. The single RF feed line... Figure 12B (For simplicity, the top wall 1204 of the first RS is not shown in the figure) and Figure 12C Fully visible. As can be seen, a single RF feed line is a conductive strip 1216 having a first portion extending through the bottom wall 1214 of the first RS and a second portion adjacent to the first portion and extending in the plane of the top wall 1210 of the second RS, with a gap between the first and second portions. One end of the single RF feed line has a ground contact. For example, the ground contact can be implemented as a conductive pin 1218 that connects the conductive strip 1216 to the metal frame 1220 of the tablet (see...). Figure 12C The antenna can be mounted such that it faces the gap between the metal frame 1220 and the display 1222. g Excite LB and HB resonant modes. Antenna device 1200 may be provided with a support layer 1224, which may be a PCB or FPC mounted in a metal frame 1220. Below conductive pins 1226 (see...) Figure 12C The black cone indicates the presence of a feed connection to the RF cable that transmits signals from the antenna device 1200.

[0087] from Figure 12A and Figure 12B It can also be seen that a single feeder line (i.e., conductive strip 1216) can be positioned as needed at a distance from the center line of the top wall 1204 of the second RS. C The offset distance extension. The offset distance can be defined based on one or more HB resonant modes that will be excited by the second RS in antenna device 1200.

[0088] Preferably, the antenna device 1200 further includes one or more conductive strips 1228 (see...) Figure 12A These conductive strips interconnect the top walls 1204 and 1210 of the first RS and the second RS, respectively. One or more conductive strips 1228 may be implemented in the same or similar manner as the one or more conductive strips 720 discussed above.

[0089] It should be noted again that the bottom wall 1214 of the first RS in antenna device 1200 can be grounded to the metal frame 1220 of the tablet computer via one or more conductive pads. Alternatively or additionally, the top wall 1204 of the first RS in antenna device 1200 can be grounded to the display 1222 via one or more conductive pads.

[0090] Figure 13A and Figure 13B Different schematic diagrams of the antenna device 1300 provided in the ninth exemplary embodiment are shown. More specifically, Figure 13A A general isometric view of antenna device 1300 is shown, while Figure 13B An isometric view of a portion of the antenna device 1300 (see explanation below) is shown.

[0091] Similar to the first RS of antenna devices 400, 600 to 1200, the first RS of antenna device 1300 includes a sidewall 1302 and a top wall 1304, both made of a conductive material (e.g., metal) and adjacent to each other, such that an open cavity 1306 exists beneath the top wall 1304. The open cavity 1306 may have dimensions similar to those of open cavity 412 and may be used to excite one or more LB resonant modes, similar to those discussed above with reference to open cavity 412.

[0092] Similar to the second RS of antenna devices 400, 600 to 1200, the second RS of antenna device 1300 includes a sidewall 1308 and a top wall 1310, both made of a conductive material (e.g., metal) and adjacent to each other, such that an open cavity 1312 exists below the top wall 1310. The open cavity 1312 may have a similar size to the open cavity 420 and can be used to excite one or more HB resonant modes, similar to the modes discussed above with reference to the open cavity 420. Figure 13A and Figure 13B It can be seen that the length of the open cavity 1312 of the second RS (in direction 1) is less than the length of the open cavity 1306 of the first RS.

[0093] In a ninth exemplary embodiment, the second RS is partially disposed within the open cavity 1306 of the first RS. More specifically, the sidewall 1308 of the second RS extends parallel to the sidewall 1302 of the first RS below the top wall 1304 of the first RS, and the top wall 1310 of the second RS extends parallel to the top wall 1304 of the first RS in a direction away from the sidewall 1302 of the first RS. Similar to antenna device 800, the top wall 1310 of the second RS in antenna device 1300 has an upwardly curved portion 1314 extending outside the open cavity 1306 of the first RS. Additionally, similar to antenna devices 1000 and 1200, the first RS of antenna device 1300 includes a bottom wall 1316 that is curved to form the sidewall 1308 and the top wall 1310 of the second RS, respectively.

[0094] Furthermore, similar to antenna device 1200, antenna device 1300 includes a single RF feed line for the first RS and the second RS, but its implementation is similar. Figures 12A to 12C The differences are shown. In Figure 13B In the figure, a single feeder wire is fully visible (the top wall 1304 of the first RS is not shown for convenience). As can be seen, the single feeder wire serves as a bent conductive strip 1318, which is shaped or bent in the same manner as the bottom wall 1316, leaving gaps on both sides. The conductive strip 1318 also includes an additional bent portion consisting of two sub-parts 1320 and 1322. Sub-part 1320 extends perpendicular to the top wall 1304 of the first RS. Sub-part 1322 extends in the plane of the top wall 1304 of the first RS, leaving gaps on both sides (see Figure 1316). Figure 13A For example, conductive strip 1318 can be connected to an RF cable via feed terminal 1324.

[0095] It should be noted again that the bottom wall 1316 of the first RS in antenna device 1300 can be grounded to the metal frame of the tablet computer (as shown in the previous figure) via one or more conductive pads. Additionally or alternatively, the top wall 1304 of the first RS in antenna device 1300 can be grounded to the display of the tablet computer (as shown in the previous figure) via one or more conductive pads.

[0096] Those skilled in the art will also recognize that the first RS and / or second RS of each antenna device in antenna devices 1200 and 1300 may be partially or completely filled with dielectric material (e.g., as shown in the image). Figure 6 (As shown).

[0097] Figure 14 The impedance matching (S11 parameter) of antenna device 1200 simulated in the test platform is shown as a function of frequency. The test platform is shown in Figure 4 to... Figure 8 A simplified simulation model of a flat panel device.

[0098] Figure 15 The relationship between the overall efficiency and radiation efficiency of antenna device 1200 as simulated on a test platform and frequency is shown.

[0099] Figures 16A to 16C The antenna device 1600 provided in the tenth exemplary embodiment is schematically shown in an LB resonant mode ( Figure 16A ) and two HB resonance modes ( Figure 16B and Figure 16C The direction and magnitude of the electric field under ( ). Assume Figures 16A to 16C The arrows of different sizes shown represent different amplitudes of the electric field. The LB resonant mode corresponds to 2.45 GHz, and the HB resonant modes correspond to 5.3 GHz and 5.6 GHz, respectively. Again, assume that the antenna device 1600 is arranged within a metal frame below the display of a tablet computer (such as tablet computer 100). The antenna device 1600 includes a first (LB) RS and a second (HB) RS in a support layer ( Figures 16A to 16C The support layer (not shown) is a stack on a metal frame, which may be a PCB or FPC mounted in the metal frame or a part of the metal frame itself.

[0100] Antenna device 1600 is implemented in a similar manner to antenna device 700. More specifically, the first RS of antenna device 1600 includes a sidewall 1602 and a top wall 1604, both made of a conductive material (e.g., metal) and adjacent to each other, such that an open cavity 1606 exists below the top wall 1604. The second RS of antenna device 1600 includes a sidewall 1608 and a top wall 1610, both made of a conductive material (e.g., metal) and adjacent to each other, such that an open cavity 1612 exists below the top wall 1610. The top walls 1604 and 1610 of the first RS and the second RS are interconnected by a conductive strip or conductive pin 1614 (similar to conductive pin 720). Antenna device 1600 differs from antenna device 700 in that the first RS and the second RS are fed using a single RF feed line 1616. The feed line 1616 can be connected to... Figures 12A to 12C The feeder shown is implemented in a similar way, that is, as an off-center feeder.

[0101] from Figures 16A to 16C In the diagram, it can be clearly seen how the off-center feed line 1616 causes the second RS to simultaneously excite two different HB modes at higher frequencies.

[0102] In some other embodiments, the top wall of the first RS in any of the antenna devices 400, 600 to 1300, 1600 can be used as a metal mesh.

[0103] Some other embodiments are possible, wherein one or more of antenna devices 400, 600 to 1300, 1600 include an additional third RS for exciting one or more other (compared to the second RS) HB resonant modes or resonant modes at any higher frequency bands, and is at least partially arranged within the open cavity of the second RS. For example, refer to Figure 4A and Figure 4B In the first exemplary embodiment shown, this third RS can be partially or wholly arranged within the open cavity 420 of the second RS in the antenna device 400. Furthermore, such a third RS can be shaped or oriented in the same or similar manner as the second RS, or the second RS can be arranged as... Figure 4A and Figure 4B The configuration is shown, and the third RS can be arranged using the orthogonal orientation described above.

[0104] Although exemplary embodiments of the invention have been described herein, it should be noted that various changes and modifications may be made to the embodiments of the invention without departing from the scope of legal protection defined by the appended claims. In the appended claims, the word "comprising" does not exclude other elements or operations, and the terms "a" or "an" do not exclude multiple. The enumeration of certain measures in dissimilar appended claims does not imply that combinations of these measures cannot be used advantageously.

Claims

1. An antenna device, characterized in that, include: Support layer; A first resonant structure (RS) is disposed on the support layer and used to excite at least one low-band (LB) resonant mode. The first RS includes a sidewall and a top wall, which are conductive. The sidewall and the top wall of the first RS are adjacent to each other, such that an open cavity exists below the top wall of the first RS. A second RS is disposed on the support layer and used to excite at least one high-band (HB) resonant mode. The second RS includes a sidewall and a top wall, which are conductive. The sidewall and the top wall of the second RS are adjacent to each other, such that an open cavity exists below the top wall of the second RS. At least one radio frequency (RF) feed line is provided for feeding each of the first RS and the second RS, the at least one RF feed line being disposed on the support layer; Wherein, the second RS is at least partially arranged within the open cavity of the first RS, such that: The sidewall of the second RS extends parallel to the sidewall of the first RS below the top wall of the first RS, and the top wall of the second RS extends parallel to the top wall of the first RS in the open cavity of the first RS in a direction away from the sidewall of the first RS. or The sidewall of the second RS extends perpendicularly to the sidewall of the first RS below the top wall of the first RS, and the top wall of the second RS extends parallel to the top wall of the first RS within the open cavity of the first RS.

2. The antenna device according to claim 1, characterized in that, The open cavity of at least one of the first RS and the second RS is at least partially filled with dielectric material.

3. The antenna device according to claim 1 or 2, characterized in that, The first RS further includes a bottom wall adjacent to the side wall of the first RS below the top wall of the first RS, the bottom wall being conductive and including an upwardly curved portion, the upwardly curved portion forming the side wall and the top wall of the second RS, respectively.

4. The antenna device according to claim 1 or 2, characterized in that, The first RS further includes a bottom wall adjacent to the side wall of the first RS below the top wall of the first RS, and the second RS further includes a bottom wall adjacent to the side wall of the second RS below the top wall of the second RS. The bottom walls of the first RS and the second RS are conductive, and the bottom wall of the first RS includes an upwardly curved portion that forms the top wall, the side wall and the bottom wall of the second RS, respectively. The upwardly curved portion is configured such that the bottom wall of the second RS extends through the bottom wall of the first RS.

5. The antenna device according to claim 1 or 2, characterized in that, Also includes: At least one shielding element is disposed on the support layer inside or outside the open cavity of the first RS, located on each opening side of the open cavity of the first RS adjacent to the sidewall of the first RS; and / or At least one shielding element is disposed on the support layer inside or outside the open cavity of the second RS, located on each opening side of the open cavity of the second RS adjacent to the sidewall of the second RS.

6. The antenna device according to claim 3, characterized in that, Also includes: At least one shielding element is disposed on the bottom wall inside the open cavity of the first RS, located on each opening side of the open cavity of the first RS adjacent to the sidewall of the first RS; and / or At least one shielding element is disposed on the support layer inside or outside the open cavity of the second RS, located on each opening side of the open cavity of the second RS adjacent to the sidewall of the second RS.

7. The antenna device according to claim 4, characterized in that, Also includes: At least one shielding element is disposed on the bottom wall inside the open cavity of the first RS, located on each opening side of the open cavity of the first RS adjacent to the side wall of the first RS.

8. The antenna device according to any one of claims 1 to 7, characterized in that, The top wall of the first RS and the top wall of the second RS are connected by at least one conductive strip.

9. The antenna device according to any one of claims 1 to 8, characterized in that, The at least one RF feed line includes a first RF feed line for feeding the first RS and a second RF feed line for feeding the second RS, wherein the first RF feed line extends in or on the support layer and has an end connected to the top wall of the first RS via a conductive pin, and the second RF feed line extends in or on the support layer and has an end connected to the top wall of the second RS via a conductive pin.

10. The antenna device according to claim 9, characterized in that, The second RF feed line extends from the support layer to the top wall of the second RS, and is offset from the centerline of the top wall of the second RS by an offset distance defined based on the at least one HB resonant mode.

11. The antenna device according to any one of claims 1 to 10, characterized in that, The top wall of the first RS has a first portion and a second portion adjacent to the first portion, the first portion extending above and parallel to the top wall of the second RS, the second portion extending further than the top wall of the second RS and bending downward perpendicular to the support layer.

12. The antenna device according to any one of claims 1 to 10, characterized in that, The top wall of the second RS has a first portion and a second portion adjacent to the first portion. The first portion extends parallel to the top wall of the first RS inside the open cavity of the first RS, and the second portion extends outside the open cavity of the first RS and bends upward perpendicular to the support layer.

13. The antenna device according to claim 12, characterized in that, At least one of the first part and the second part is used as a multifinite structure.

14. The antenna device according to any one of claims 1 to 10, characterized in that, The top wall of the second RS serves as a metal mesh.

15. The antenna device according to any one of claims 1 to 14, characterized in that, The frequency range of the at least one LB resonant mode is from 2400 MHz to 2484 MHz, and the frequency range of the at least one HB resonant mode is from 5170 MHz to 5835 MHz.

16. The antenna device according to any one of claims 1 to 15, characterized in that, The at least one LB resonant mode includes a quarter-wavelength LB mode, and the open cavity of the first RS has a width defined based on the quarter-wavelength LB mode; the at least one HB resonant mode includes a quarter-wavelength HB mode and a half-wavelength HB mode, and the open cavity of the second RS has a length defined based on the half-wavelength HB mode and a width defined based on the quarter-wavelength HB mode and the half-wavelength HB mode.

17. The antenna device according to any one of claims 1 to 16, characterized in that, Each of the at least one RF feed line serves as a capacitive feed structure.

18. A mobile user equipment, characterized in that, include: monitor; A metal frame having a base and a sidewall adjacent to the edge of the base, the metal frame surrounding the display such that a gap exists between the display and the sidewall of the metal frame; The antenna device according to any one of claims 1 to 17, wherein the antenna device is arranged between the base of the metal frame and the display, such that the gap serves as a radiation aperture for the at least one LB resonant mode and the at least one HB resonant mode.

19. The user mobile device according to claim 18, characterized in that, It also includes a set of shielding elements arranged along the edge of the top wall of the first RS of the antenna device between the antenna device and the display.

Images