A wearable meta-resonant antenna

Abstract

The application provides a wearable dielectric resonant antenna, comprising a flexible dielectric substrate, a feed excitation unit arranged on the flexible dielectric substrate, and a radiation unit arranged on the feed excitation unit, wherein the feed excitation unit comprises a truncated artificial surface plasmon transmission line fed by a coplanar waveguide; the radiation unit comprises a top dielectric resonator and a bottom dielectric resonator with different dielectric constants, the top dielectric resonator and the bottom dielectric resonator form a double-layer stacked structure, the double-layer stacked structure covers the truncated part of the artificial surface plasmon transmission line and is in contact with the artificial surface plasmon transmission line through the bottom dielectric resonator. The wearable dielectric resonant antenna of the application has a simple feed structure and effectively realizes wideband characteristics, and has a relatively wide working bandwidth.

Description

Technical Field

[0001] This invention relates to the field of wireless communication technology, and more particularly to a wearable dielectric resonant antenna. Background Technology

[0002] In the field of public safety wireless communication and some military applications, wearable antennas are required to provide frequent, reliable, and long-distance communication in complex environments. Because the UHF (Ultra High Frequency) band (300-3000MHz) has good coverage and penetration, and because designing antennas as wearable devices embedded in clothing improves concealment, comfort, and portability, making them suitable for military rescue or emergency services, research on wearable antennas in the UHF band is of great significance for communication in police, fire, ambulance, and military fields.

[0003] Traditional UHF band antennas used for public safety and tactical communications often employ whip antennas, which are large and have poor concealment. To address this issue, vest-style wearable antennas operating in the UHF band have been proposed, but they require the integration of complex matching networks, and their operating bandwidth is limited by these networks. Summary of the Invention

[0004] In view of this, embodiments of the present invention provide a wearable dielectric resonant antenna with simple feeding and a wide operating bandwidth, in order to eliminate or improve one or more defects existing in the prior art.

[0005] This invention provides a wearable dielectric resonant antenna, comprising: a flexible dielectric substrate, a feeding and excitation unit disposed on the flexible dielectric substrate, and a radiating unit disposed on the feeding and excitation unit.

[0006] The feeding excitation unit includes a truncated artificial surface plasma transmission line fed by a coplanar waveguide;

[0007] The radiating unit includes a top dielectric resonator and a bottom dielectric resonator with different dielectric constants. The top dielectric resonator and the bottom dielectric resonator form a double-layer stacked structure. The double-layer stacked structure covers the cut-off point of the artificial surface plasma transmission line and contacts the artificial surface plasma transmission line through the bottom dielectric resonator.

[0008] In some embodiments of the present invention, the feeding excitation unit further includes: a coplanar waveguide feeding module, a mode conversion module, and a ground plane symmetrically disposed at both ends of the artificial surface plasma transmission line.

[0009] The coplanar waveguide feeding module is used to provide coplanar waveguide feeding for the artificial surface plasma transmission line;

[0010] The mode conversion module is used to connect the coplanar waveguide feed module and the artificial surface plasma transmission line to realize the conversion from waveguide mode to artificial surface plasma transmission mode and momentum matching.

[0011] In some embodiments of the present invention, the mode conversion module includes a mode conversion transmission line and a portion of a ground plane containing a plurality of rectangular slots spaced apart. The mode conversion transmission line and the portion of the ground plane are symmetrically arranged vertically and spaced apart. The depth of the rectangular slots increases from the side closer to the coplanar waveguide feed module to the side farther away from the coplanar waveguide feed module, and the depth of the rectangular slots at the ends of the increasing trend is the same.

[0012] In some embodiments of the present invention, the wearable dielectric resonant antenna further includes two feed ports, which are respectively disposed at the feed points of the symmetrical coplanar waveguide feed module.

[0013] In some embodiments of the present invention, the grounding plate adopts a curved gradient grounding plate.

[0014] In some embodiments of the present invention, the coplanar waveguide feed module includes another part of a coplanar waveguide feed transmission line and a ground plane that are symmetrically arranged vertically. The coplanar waveguide feed transmission line and the other part of the ground plane are spaced apart. The coplanar waveguide feed transmission line includes a rectangular transmission line structure and a trapezoidal transition structure connected to the rectangular transmission line structure. The transmission line of the trapezoidal transition structure near the mode conversion module, the mode conversion transmission line of the mode conversion module, and the artificial surface plasma transmission line have the same length.

[0015] In some embodiments of the present invention, the artificial surface plasma transport line is formed by a periodic arrangement of transport line units, wherein the transport line units are H-shaped.

[0016] In some embodiments of the present invention, the cut-off distance at the cut-off point of the artificial surface plasma transmission line is 2-8 mm.

[0017] In some embodiments of the present invention, the dielectric constant of the top dielectric resonator is between 20 and 40, and the dielectric constant of the bottom dielectric resonator is greater than or equal to 80.

[0018] The dielectric resonator is cylindrical, cuboid, or hemispherical in shape.

[0019] In some embodiments of the present invention, the wearable dielectric resonant antenna operates at a frequency of 0.46-1 GHz.

[0020] In some embodiments of the present invention, the thickness of the flexible dielectric substrate is 0.1-0.3 mm.

[0021] The radiating element of the wearable dielectric resonator of this invention employs double-layered stacked dielectric resonators with different dielectric constants. This reduces the overall Q value of the dielectric resonator, increases the bandwidth of the resonant modes, and is expected to excite multiple resonant modes within the dielectric resonator. The antenna's feeding and excitation unit comprises a truncated artificial surface plasmon transmission line fed by a coplanar waveguide, resulting in a simple feeding circuit. The double-layered stacked dielectric resonator is placed over the truncated section of the artificial surface plasmon transmission line and in contact with it. The truncated artificial surface plasmon transmission line can excite multiple resonant modes of the dielectric resonator, and the merging of these multiple resonant modes effectively achieves the broadband characteristics of the antenna, giving the wearable dielectric resonator a wide operating bandwidth. Furthermore, using a truncated artificial surface plasmon transmission line to excite the double-layered stacked dielectric resonator effectively overcomes the narrowband problem that occurs with traditional microstrip, slot, and probe feeding methods at high Q values ​​of dielectric resonators.

[0022] As an optional embodiment of the present invention, the top and bottom dielectric resonators of the double-layer stacked dielectric resonator in the wearable dielectric resonator of the present invention both adopt high dielectric constants, which enables the antenna to be miniaturized and operate in the UHF band.

[0023] As an optional embodiment of the present invention, the wearable dielectric resonant antenna of the present invention has two symmetrical feed ports at the coplanar waveguide feed point, which can work effectively in both single-port feeding and dual-port differential feeding. The feed circuit is simple and achieves good omnidirectional radiation characteristics. By switching between single-port feeding and dual-port differential feeding, the maximum radiation direction of the antenna can be changed, realizing the reconfigurable characteristics of the antenna radiation pattern and the characteristics of omnidirectional communication.

[0024] As an optional embodiment of the present invention, the wearable dielectric resonant antenna of the present invention uses polyimide, a flexible material with good stability, as the dielectric substrate, which makes the wearable antenna have good bending resistance and can better realize the conformity between the antenna and the human body, thereby having stronger concealment.

[0025] Additional advantages, objects, and features of the invention will be set forth in part in the description which follows, and will also become apparent in part to those skilled in the art upon studying the description, or may be learned by practice of the invention. The objects and other advantages of the invention can be realized and obtained by means of the structures specifically pointed out in the specification and drawings.

[0026] Those skilled in the art will understand that the objectives and advantages achievable with this invention are not limited to those specifically described above, and that the above and other objectives achievable with this invention will become clearer from the following detailed description. Attached Figure Description

[0027] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this application, are not intended to limit the scope of the invention. The components in the drawings are not drawn to scale but are merely illustrative of the principles of the invention. For ease of illustration and description of certain parts of the invention, corresponding portions in the drawings may be enlarged, i.e., may appear larger relative to other components in an exemplary device actually manufactured according to the invention. In the drawings:

[0028] Figure 1 This is a side view of one embodiment of the wearable dielectric resonant antenna of the present invention in a flat state;

[0029] Figure 2 This is a top view of one embodiment of the wearable dielectric resonant antenna of the present invention in a flat state.

[0030] Figure 3 This is a schematic diagram illustrating two working scenarios of the wearable dielectric resonant antenna of the present invention being applied to the human body in a bent state.

[0031] Figure 4 The diagram shows the S-parameters of a preferred embodiment of the wearable dielectric resonant antenna of the present invention in both straight and curved states.

[0032] Figure 5 This is a schematic diagram of the electric field vectors at four resonant points for a preferred embodiment of the wearable dielectric resonant antenna of the present invention.

[0033] Figure 6 The diagram shows the peak gain parameters of the preferred embodiment of the wearable dielectric resonant antenna of the present invention under single-port feeding and dual-port differential feeding conditions.

[0034] Figure 7 This is a schematic diagram (from left to right) showing the radiation directions of the H-plane and E-plane at 0.6 GHz and 0.9 GHz in a preferred embodiment of the wearable dielectric resonant antenna of the present invention when fed by a single port.

[0035] Figure 8 This is a schematic diagram (from left to right) showing the radiation directions of the H-plane and E-plane at 0.6 GHz and 0.9 GHz in a preferred embodiment of the wearable dielectric resonant antenna of the present invention under dual-port differential feeding.

[0036] Figure label:

[0037] 101-Flexible dielectric substrate, 102-Ground plane, 1021-Part of ground plane, 1022-Another part of ground plane, 103-Coplanar waveguide feed module, 1031-Coplanar waveguide feed transmission line, 104-Mode conversion module, 1041-Mode conversion transmission line, 105-Transmission line unit, 106-Truncate artificial surface plasma transmission line, 201-Bottom dielectric resonator, 202-Top dielectric resonator, 1-Feed excitation unit, 2-Radiation unit. Detailed Implementation

[0038] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the embodiments and accompanying drawings. Here, the illustrative embodiments and descriptions of this invention are used to explain the invention, but are not intended to limit the invention.

[0039] It should also be noted that, in order to avoid obscuring the invention with unnecessary details, only the structures and / or processing steps closely related to the solution according to the invention are shown in the accompanying drawings, while other details that are not closely related to the invention are omitted.

[0040] It should be emphasized that the term "including / comprises" as used herein refers to the presence of a feature, element, step, or component, but does not exclude the presence or addition of one or more other features, elements, steps, or components.

[0041] It should also be noted that, unless otherwise specified, the term "connection" in this article can refer not only to a direct connection, but also to an indirect connection involving an intermediary.

[0042] In the following description, embodiments of the invention will be illustrated with reference to the accompanying drawings. In the drawings, the same reference numerals represent the same or similar parts, or the same or similar steps.

[0043] Figure 1 and Figure 2 These are, respectively, a side view and a top view of an embodiment of the wearable dielectric resonant antenna of the present invention in a flat state. Figure 3 This diagram illustrates two operating scenarios of the wearable dielectric resonant antenna of the present invention when it is applied to the human body in a bent state. Please refer to [link / reference]. Figure 1 , Figure 2 and Figure 3The wearable dielectric resonant antenna of this invention includes: a flexible dielectric substrate 101, a feeding and excitation unit 1 disposed on the flexible dielectric substrate 101, and a radiating unit 2 disposed on the feeding and excitation unit 1. The feeding and excitation unit 1 includes: a truncated artificial surface plasmon transmission line 106 fed by a coplanar waveguide. The radiating unit 2 includes a top dielectric resonator 202 and a bottom dielectric resonator 201 with different dielectric constants. The top dielectric resonator 202 and the bottom dielectric resonator 201 form a double-layer stacked structure, which covers the truncated portion of the artificial surface plasmon transmission line 106 and contacts the artificial surface plasmon transmission line 106 through the bottom dielectric resonator 201 therein.

[0044] The wearable dielectric resonant antenna of this embodiment is fed by a coplanar waveguide, which simplifies the feeding process. The top dielectric resonator 202 and bottom dielectric resonator 201, which serve as radiators, employ dielectric resonators with different dielectric constants, reducing the overall Q value of the dielectric resonator, increasing the bandwidth of the resonant modes, and potentially exciting multiple resonant modes within the dielectric resonator. The top dielectric resonator 202 and bottom dielectric resonator 201, forming a double-layer stacked structure, are excited through the leakage site at the truncated artificial surface plasmon transmission line printed on the flexible dielectric substrate 101, and can be excited to generate multiple different resonant modes. These modes, when combined, form a wider operating bandwidth, enabling the wearable dielectric resonant antenna to achieve broadband characteristics. Simultaneously, the use of a truncated artificial surface plasmon transmission line 106 to excite the radiating element 2 effectively overcomes the narrowband problem that occurs with traditional microstrip, slot, and probe feeding methods at high Q values ​​of dielectric resonators.

[0045] In a preferred embodiment of the present invention, the power supply excitation unit 1 is printed on a flexible dielectric substrate 101 via a PCB.

[0046] In a preferred embodiment of the present invention, the center of the double-layer stacked top dielectric resonator 202 and bottom dielectric resonator 201 is located directly above the middle cut-off of the artificial surface plasma transmission line 106, which can effectively excite the dielectric resonator and better realize signal transmission.

[0047] As an optional embodiment of the present invention, the power feeding excitation unit 1 further includes: a coplanar waveguide power feeding module 103, a mode conversion module 104, and a ground plane 102. The coplanar waveguide power feeding module 103, the mode conversion module 104, and the ground plane 102 are symmetrically arranged at both ends of the artificial surface plasma transmission line 106. The coplanar waveguide power feeding module 103 is used to provide coplanar waveguide power to the artificial surface plasma transmission line 106. The mode conversion module 104 is used to connect the coplanar waveguide power feeding module 103 and the artificial surface plasma transmission line 106 to realize the conversion from waveguide mode to artificial surface plasma transmission mode (SSPPs mode) and momentum matching.

[0048] As an optional embodiment of the present invention, the mode conversion module 104 includes a mode conversion transmission line 1041 with several rectangular slots spaced apart and a portion of a ground plane 1021, which are symmetrically arranged vertically. The depth of the rectangular slots increases from the side near the coplanar waveguide feed module 103 to the side away from the coplanar waveguide feed module 103, and the depth of the rectangular slots at the ends of the increasing trend is the same. The portion of the rectangular slots with increasing depth forms a trapezoidal gradient slotted structure. Since momentum mismatch will occur when the coplanar waveguide structure is directly connected to the artificial surface plasma transmission mode, the mode conversion module 104 is designed to ensure efficient signal transmission. Specifically, the mode conversion module 104 uses a gradient slotted structure to realize the conversion from the waveguide mode to the artificial surface plasma transmission mode, thereby achieving momentum matching.

[0049] As an optional embodiment of the present invention, the ground plane 102 adopts a gradually tapered ground plane, which can achieve impedance matching from the coplanar waveguide to the SSPPs waveguide. As an optional embodiment of the present invention, the coplanar waveguide feed module 103 includes a vertically symmetrical coplanar waveguide feed transmission line 1031 and another part 1022 of the ground plane, which are spaced apart. The coplanar waveguide feed transmission line 1031 includes a rectangular transmission line structure and a trapezoidal transition structure, which are connected. The transmission line of the trapezoidal transition structure near the mode conversion module 104, the mode conversion transmission line 1041 in the mode conversion module 104, and the artificial surface plasma transmission line 106 have the same length, which is beneficial for achieving mode conversion and momentum matching, and further ensures efficient signal transmission.

[0050] As an optional embodiment of the present invention, the wearable dielectric resonant antenna further includes two feed ports, which are respectively located at the feed points of the symmetrical coplanar waveguide feed module 103. These two feed ports can be connected to SMA RF connection lines. When using single-port feeding, at the truncated point of the transmission line, the field of the artificial surface plasmon transmission line 106 can couple to the unexcited transmission line at the other end, achieving omnidirectional radiation characteristics, with the maximum radiation directions of the E-plane being approximately 30 degrees and 210 degrees. When using dual-port differential feeding, it has a symmetrical omnidirectional radiation pattern, with the maximum radiation directions of the E-plane being 0 degrees and 180 degrees. Therefore, the wearable dielectric resonant antenna can operate effectively in both single-port and dual-port differential feeding modes, with a simple feed circuit and good omnidirectional radiation characteristics. Changing the excitation form of the feed ports can change the maximum radiation direction of the antenna, realizing the reconfigurable characteristics of the antenna's radiation pattern, thereby improving the antenna gain, enabling omnidirectional communication characteristics, enhancing the transmission capability of UHF band signals, and expanding the communication range.

[0051] As an optional embodiment of the present invention, the artificial surface plasma transmission line 106 is formed by periodically arranging transmission line units 105. The transmission line units 105 are H-shaped, and the dispersion curve of the H-shaped transmission line units 105 is below the light dispersion curve, which can confine the electromagnetic field to the surface of the transmission line and transmit surface waves along the direction of the transmission line units 105. In the direction perpendicular to the propagation direction, the surface waves exhibit exponential decay, which can realize the slow wave transmission characteristics of the transmission line, thereby enabling reliable transmission of UHF band signals and ensuring the reliability of communication.

[0052] In a preferred embodiment of the present invention, the upper and lower parts of the H-shaped transmission line unit 105 each have a slot with a length of 6.5 mm and a width of 1.8 mm.

[0053] As an optional embodiment of the present invention, the cut-off distance d at the truncated point of the artificial surface plasma transmission line 106 is 2-8 mm. When the cut-off distance is greater than 8 mm or less than 2 mm, the transmission line is in a state of not working properly or basically not working. This cut-off distance d also has a certain impact on the S-parameters; too close or too far a distance will affect the coupling between the transmission line and the dielectric resonator. Preferably, the cut-off distance d at the truncated point of the artificial surface plasma transmission line 106 is 2 mm, which provides good power feeding performance and the best excitation effect on the dielectric resonator.

[0054] As an optional embodiment of the present invention, the artificial surface plasma transmission line 106 is made of a metallic material, preferably copper, which can reduce the manufacturing cost of the antenna while meeting the signal transmission performance requirements.

[0055] As an optional embodiment of the present invention, in order to achieve miniaturization, operation in the UHF band, and a low profile in the wearable dielectric resonator antenna, both the top and bottom dielectric resonators of the double-layer stack are made of high dielectric constants. The dielectric constant of the top dielectric resonator 202 is between 20 and 40 (inclusive), and the dielectric constant of the bottom dielectric resonator 201 is greater than or equal to 80. The top dielectric resonator 202 and the bottom dielectric resonator 201 are made of different ceramic materials, both of which have high dielectric constants, enabling the wearable dielectric resonator antenna to be effectively miniaturized. At the same time, the purpose of the double-layer stacked structure composed of dielectric resonators with different dielectric constants is to reduce the overall Q value of the dielectric resonator, increase the bandwidth of the resonant mode, and is expected to excite multiple resonant modes inside the dielectric resonator. Preferably, the top dielectric resonator 202 is made of molybdenum-based ceramic material Bi2Mo2O9 with a dielectric constant of 38 and a height of h2. The bottom dielectric resonator 201 is made of molybdenum-based ceramic material (Li,Bi)(MoV)O4 with a dielectric constant of 81 and a height of h1.

[0056] As an optional embodiment of the present invention, the dielectric resonator is cylindrical, cuboid, or hemispherical. Preferably, both the top and bottom dielectric resonators of the double-layer stack are cylindrical, with a base radius R of 26mm, which is easy to manufacture and has low manufacturing cost. The height h1 of the bottom dielectric resonator 201 is 3mm, and the height h2 of the top dielectric resonator 202 is 6mm, which allows the operating frequency of the wearable dielectric resonator to meet the expected requirements, while also conforming to the bandwidth characteristics. The height design of the top and bottom dielectric resonators affects the antenna's operating frequency, excitation mode, and bandwidth characteristics.

[0057] As an optional embodiment of the present invention, the thickness t of the flexible dielectric substrate 101 is 0.1-0.3 mm. The flexible dielectric substrate 101 is made of polyimide material, which has good stability, giving the wearable dielectric resonant antenna good bending resistance, thereby enabling better conformal adaptation between the antenna and the human body. Preferably, the thickness t of the flexible dielectric substrate 101 is 0.2 mm, and the dimensions are 266*60*0.2 mm. 3 Its dielectric constant is 4 and its loss tangent is 0.002, which can better ensure the flexibility of the antenna, making it easier for the antenna to conform to the human body and less likely to break during wear.

[0058] As an optional embodiment of the present invention, the wearable dielectric resonant antenna operates at a frequency of 0.46-1 GHz.

[0059] Please see Figure 3The wearable dielectric resonant antenna of this invention can be placed on the surface of human tissues such as the shoulder or arm when in operation, and can be integrated into the clothing of the human body as or disguised as epaulettes, sleeve badges or armbands, thus having stronger concealment.

[0060] In a preferred embodiment of the present invention, the dimensions of each parameter are shown in Table 1:

[0061] Table 1

[0062]

[0063] Where L1 represents the length of the coplanar waveguide-fed transmission line 1031, L2 represents the length of the mode conversion transmission line 1041, L3 represents the length of the artificial surface plasmonic transmission line 106, and w g The width of the other part 1022 of the single-sided ground plane 1022 near the end of the flexible dielectric substrate 101 is represented by the characteristic impedance of the coplanar waveguide feed module 103, which is 50Ω. w1 represents the width of the coplanar waveguide feed transmission line 1031 near the end of the flexible dielectric substrate 101 (i.e., the width of the rectangular structure of the transmission line). g represents the distance (spacing) between the coplanar waveguide feed transmission line or mode conversion transmission line 1041 and the ground plane 102. l represents the length of the trapezoidal transition structure in the coplanar waveguide feed transmission line 1031, which increases the linewidth of the coplanar waveguide feed transmission line 1031 while ensuring low return loss. h and p represent the length and width of the transmission line unit 105, respectively. k1 represents the slope of the trapezoidal hypotenuse of the tapered slotted structure in the mode conversion module 104, where the hypotenuse is y = k1·x. To achieve impedance matching from the coplanar waveguide to the SSPPs waveguide, the ground plane 102 adopts a curved tapered ground plane, the curve function of which is:

[0064] y = f(x) = C1e αx +C2

[0065] in

[0066] α = 0.22

[0067] In C1 and C2, the parameter α mainly affects the curvature of the gradient ground surface. The parameters (x1, y1) and (x2, y2) represent the coordinates of the first and last points of the gradient ground surface, which can control the size and curvature of the ground surface.

[0068] Based on the values ​​of the wearable dielectric resonant antenna parameters in Table 1 above, modeling and simulation were performed to obtain the following results: Figure 4-8The S-parameters, resonant modes, peak gain, and radiation pattern of the UHF band broadband wearable dielectric resonant antenna are presented. In a bent state, the bottom dielectric resonator 201 is in close contact with the artificial surface plasma transmission line 106 at its bottom to achieve better excitation.

[0069] Figure 4 These are schematic diagrams illustrating the S-parameters of a preferred embodiment of the wearable dielectric resonant antenna of the present invention in both flat and curved states. Please refer to... Figure 4 The wearable dielectric resonant antenna has four resonant frequencies, each corresponding to the HEM of the excitation double-layer stacked dielectric resonator. 11δ Pattern, TM 01δ Pattern, TM 02δ Pattern and TM 03δ The four modes have relatively close resonant frequencies, thus, by merging the resonant modes, a wide operating bandwidth is generated. Its bandwidth characteristics are as follows: the wearable dielectric resonant antenna has a -6dB impedance bandwidth of 73.97% (0.46-1.00GHz) in a flat state and 61.11% (0.50-0.94GHz) in a bent state. The wearable dielectric resonant antenna exhibits a wide operating bandwidth in both states, and it can be seen that bending the flexible dielectric substrate has almost no effect on the antenna's resonant frequency, indicating that this wearable dielectric resonant antenna has good robustness.

[0070] Figure 5 This is a schematic diagram of the electric field vectors at four resonant points for a preferred embodiment of the wearable dielectric resonant antenna of the present invention. Please refer to [link to relevant documentation]. Figure 5 The wearable dielectric resonant antenna operates at 580MHz, 610MHz, 720MHz, and 770MHz, respectively exciting the HEM of a double-layer stacked dielectric resonator. 11δ Pattern, TM 01δ Pattern, TM 02δ Pattern and TM 03δ model.

[0071] Figure 6 The diagram illustrates the peak gain parameters of the preferred embodiment of the wearable dielectric resonant antenna of the present invention under single-port feeding and dual-port differential feeding conditions. Please refer to... Figure 6 The gain of a dual-port differential-fed wearable dielectric resonator antenna is improved by 1 to 2 dBi compared to that of a single-port fed antenna.

[0072] Figure 7 This is a schematic diagram (from left to right) showing the radiation directions of the H-plane and E-plane at 0.6 GHz and 0.9 GHz in a preferred embodiment of the wearable dielectric resonant antenna of the present invention when fed by a single port. Please refer to... Figure 7Wearable dielectric resonant antennas can achieve good omnidirectional radiation characteristics. When fed by a single port, the maximum radiation direction of the E plane is about 30 degrees and 210 degrees.

[0073] Figure 8 This is a schematic diagram (from left to right) showing the radiation directions of the H-plane and E-plane at 0.6 GHz and 0.9 GHz, respectively, of a preferred embodiment of the wearable dielectric resonant antenna of the present invention with dual-port differential feeding. Please refer to... Figure 8 The wearable dielectric resonant antenna has good omnidirectional radiation characteristics. When switched to dual-port feeding, the maximum radiation direction of the E plane is 0 degrees and 180 degrees, realizing the reconfigurable radiation pattern.

[0074] It should be clarified that the present invention is not limited to the specific configurations and processes described above and shown in the figures.

[0075] In this invention, features described and / or illustrated for one embodiment may be used in the same or similar manner in one or more other embodiments, and / or combined with or in place of features of other embodiments.

[0076] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, various modifications and variations of the embodiments of the present invention are possible. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A wearable dielectric resonant antenna, comprising: A flexible dielectric substrate, characterized in that it further comprises: a feeding excitation unit disposed on the flexible dielectric substrate, and a radiation unit disposed on the feeding excitation unit. The feeding and excitation unit includes a truncated artificial surface plasma transmission line fed by a coplanar waveguide, and a coplanar waveguide feeding module, a mode conversion module, and a ground plane symmetrically arranged at both ends of the artificial surface plasma transmission line. The radiating unit includes a top dielectric resonator and a bottom dielectric resonator with different dielectric constants. The top dielectric resonator and the bottom dielectric resonator form a double-layer stacked structure. The double-layer stacked structure covers the cut-off point of the artificial surface plasma transmission line and contacts the artificial surface plasma transmission line through the bottom dielectric resonator. The ground plane adopts a curved, gradually changing ground plane; the coplanar waveguide feed module includes a coplanar waveguide feed transmission line and another part of the ground plane that are symmetrically arranged vertically, the coplanar waveguide feed transmission line and the other part of the ground plane are spaced apart, the coplanar waveguide feed transmission line includes a rectangular transmission line structure and a trapezoidal transition structure connected to the rectangular transmission line structure, the transmission line of the trapezoidal transition structure near the mode conversion module, the mode conversion transmission line of the mode conversion module and the artificial surface plasma transmission line have the same length; The mode conversion module includes a mode conversion transmission line and a portion of a ground plane containing several rectangular slots spaced apart. The mode conversion transmission line and the portion of the ground plane are symmetrically arranged vertically and spaced apart. The depth of the rectangular slots increases from the side closer to the coplanar waveguide feed module to the side farther away from the coplanar waveguide feed module, and the depth of the rectangular slots at the ends of the increasing trend is the same. The wearable dielectric resonant antenna also includes two feed ports, which are respectively located at the feed points of the symmetrical coplanar waveguide feed module; the artificial surface plasma transmission line is formed by periodically arranging transmission line units, which are H-shaped; it can work effectively in both single-port and dual-port differential feeding; by switching between single-port and dual-port differential feeding, the reconfigurable radiation pattern and omnidirectional communication characteristics of the antenna are realized.

2. The wearable dielectric resonant antenna according to claim 1, characterized in that, The coplanar waveguide feeding module is used to provide coplanar waveguide feeding for the artificial surface plasma transmission line; The mode conversion module is used to connect the coplanar waveguide feed module and the artificial surface plasma transmission line to realize the conversion from waveguide mode to artificial surface plasma transmission mode and momentum matching.

3. The wearable dielectric resonant antenna according to claim 1, characterized in that, The cut-off distance at the cut-off point of the artificial surface plasma transmission line is 2-8 mm.

4. The wearable dielectric resonant antenna according to claim 1, characterized in that, The dielectric constant of the top dielectric resonator is between 20 and 40, and the dielectric constant of the bottom dielectric resonator is greater than or equal to 80. The dielectric resonator is cylindrical, cuboid, or hemispherical in shape.

5. The wearable dielectric resonant antenna according to claim 1, characterized in that, The wearable dielectric resonant antenna operates at a frequency of 0.46-1 GHz.

6. The wearable dielectric resonant antenna according to claim 1, characterized in that, The thickness of the flexible dielectric substrate is 0.1-0.3 mm.

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