Single-polarized quasi-isotropic radiation flexible conductive fabric antenna

Abstract

The invention discloses a single-polarized quasi-isotropic radiation flexible conductive fabric antenna, and relates to the field of flexible electronics. The flexible conductive fabric antenna comprises a felt substrate, a front conductive fabric, a back conductive fabric and a feed coaxial line. Wherein the front conductive cloth is arranged on the front side of the felt substrate, the back conductive cloth is arranged on the back side of the felt substrate, and the front conductive cloth and the back conductive cloth are in central symmetry about the central point of the felt substrate and are connected through a feed coaxial line; the front conductive cloth comprises front L-shaped conductive cloth and front linear conductive cloth, and the back conductive cloth comprises back L-shaped conductive cloth and back linear conductive cloth. Compared with the prior art, the antenna has quasi-isotropic radiation performance, can eliminate radiation polarization zero points, and is small in size, simple in structure and convenient to produce and process.

Description

Technical Field

[0001] The present invention relates to the field of flexible electronic technology, and more particularly to a flexible conductive fabric antenna with single-polarization quasi-isotropic radiation. Background Art

[0002] Flexible electronics technology is an emerging electronic technology that makes electronic devices made of organic / inorganic materials on flexible / ductile substrates. It has been widely used in antenna design. Most existing flexible fabric antennas are directional radiation. Due to the limitations of application scenarios and design methods, there are almost no flexible fabric antennas that can provide quasi-isotropic radiation.

[0003] Quasi-isotropic antennas provide nearly uniform radiation in the far field, which can meet the omnidirectional coverage requirements in complex communication scenarios. In particular, they can be well applied in wireless energy harvesting technology. Quasi-isotropic antennas can well receive a large amount of irregularly distributed stray radio frequency energy in the environment, thereby effectively reducing the complexity of the wireless energy harvesting system.

[0004] Existing quasi-isotropic antennas can already achieve approximately isotropy in receiving gain, but there are still radiation zeros in receiving polarization. The receiving polarization of the antenna will change with the change of the receiving direction, resulting in receiving polarization loss. Therefore, quasi-isotropic antennas with receiving polarization still need to be studied. Summary of the invention

[0005] The present invention provides a flexible conductive fabric antenna with single-polarized quasi-isotropic radiation to overcome the defects of the antenna in the prior art that it cannot provide quasi-isotropic radiation and can eliminate the radiation polarization zero point.

[0006] In order to solve the above technical problems, the technical solution of the present invention is as follows:

[0007] In a first aspect, a single-polarized quasi-isotropically radiating flexible conductive fabric antenna comprises a felt substrate, a front conductive fabric, a back conductive fabric and a feeding coaxial line;

[0008] Wherein, the front conductive fabric is arranged on the front side of the felt substrate, and the back conductive fabric is arranged on the back side of the felt substrate, and the front conductive fabric and the back conductive fabric are centrally symmetrical about the center point of the felt substrate and are connected via the feeding coaxial line; and, the front conductive fabric includes a front L-shaped conductive fabric and a front linear conductive fabric, and the back conductive fabric includes a back L-shaped conductive fabric and a back linear conductive fabric, and quasi-isotropic radiation is achieved and the radiation polarization zero point of the antenna is eliminated through the front L-shaped conductive fabric, the front linear conductive fabric, the back L-shaped conductive fabric and the back linear conductive fabric.

[0009] Furthermore, the front L-shaped conductive fabric and the back L-shaped conductive fabric, and the front linear conductive fabric and the back linear conductive fabric are respectively centrally symmetrical about the center point of the felt substrate.

[0010] Furthermore, the front L-shaped conductive fabric and the back L-shaped conductive fabric are respectively placed horizontally along the center of the felt substrate and are centrally symmetrically distributed about the center point of the felt substrate.

[0011] Furthermore, the front linear conductive fabric is arranged directly above the back L-shaped conductive fabric; and the back linear conductive fabric is arranged directly below the front L-shaped conductive fabric.

[0012] Furthermore, the center point of the front linear conductive fabric is arranged at the lower half of the felt substrate, and the center point of the back linear conductive fabric is arranged at the upper half of the felt substrate.

[0013] Furthermore, the front L-shaped conductive fabric is spaced apart from the front linear conductive fabric, and the back L-shaped conductive fabric is spaced apart from the back linear conductive fabric, and the spacing distance is determined based on the size of the corresponding front L-shaped conductive fabric or the back L-shaped conductive fabric.

[0014] Furthermore, the length of the front linear conductive fabric and / or the back linear conductive fabric is greater than a quarter wavelength of the antenna operating frequency and less than a half wavelength of the antenna operating frequency.

[0015] Furthermore, the length of the front L-shaped conductive fabric and / or the back L-shaped conductive fabric is determined according to the performance and impedance matching requirements of the antenna.

[0016] Furthermore, the feeding coaxial line includes an inner conductor and an outer conductor; wherein the inner conductor is connected to the front L-shaped conductive fabric, and the outer conductor is connected to the back L-shaped conductive fabric.

[0017] Furthermore, the inner conductor is arranged at the center point of the felt substrate.

[0018] In a second aspect, a wireless communication module comprises the flexible conductive fabric antenna according to the first aspect.

[0019] In a third aspect, a wireless communication device uses the flexible conductive fabric antenna described in the first aspect or the wireless communication module described in the second aspect.

[0020] Compared with the prior art, the technical solution of the present invention has the following beneficial effects:

[0021] The present invention discloses a single-polarized quasi-isotropically radiated flexible conductive fabric antenna, which forms a planar structure antenna by arranging a front conductive fabric and a back conductive fabric composed of an L-shaped conductive fabric and a linear conductive fabric on the front and back sides of a felt substrate, respectively. The combination of the L-shaped conductive fabric and the linear conductive fabric is used to eliminate the radiation polarization zero point. Compared with the prior art, the present invention has quasi-isotropic radiation performance, is small in size, simple in structure, and is easy to produce and process. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the front structure of the single-polarized quasi-isotropically radiating flexible conductive fabric antenna described in Example 1 of the present application.

[0023] Figure 2 This is a schematic diagram of the back structure of the single-polarized quasi-isotropically radiating flexible conductive fabric antenna described in Example 1 of the present application.

[0024] Figure 3 Schematic diagram of the front and back perspectives of the single-polarized quasi-isotropically radiating flexible conductive fabric antenna described in Example 1 of the present application.

[0025] Figure 4 This is the antenna radiation pattern of the single-polarized quasi-isotropically radiating flexible conductive fabric antenna described in Example 1 of the present application.

[0026] Figure 5 The radiation pattern comparison between the flexible conductive fabric antenna with single-polarized quasi-isotropic radiation described in Example 1 of the present application and the traditional antenna is shown.

[0027] The reference numerals are described as follows:

[0028] 1-felt substrate; 201-front L-shaped conductive fabric; 202-front linear conductive fabric; 301-back L-shaped conductive fabric; 302-back linear conductive fabric; 401-inner conductor; 402-outer conductor. DETAILED DESCRIPTION

[0029] The terms "first", "second", etc. in the specification and claims of this application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the terms used in this way can be interchangeable under appropriate circumstances. This is just a way of distinguishing objects with the same attributes when describing the embodiments of this application.

[0030] The spatial orientation or positional relationship indicated by the terms "front", "back", "upper", "lower", "front", "back", "left", "right", "vertical", "inside", "outside", etc. is based on the spatial orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. These terms indicating spatial orientation or positional relationship may be meant to include different orientations of the device in addition to the orientation depicted in the drawings. For example, if the device in the drawings is flipped, the elements described as "below other elements or features" or "below elements or features" will be oriented as "above other elements or features"; therefore, the example term "below..." may include both upward and downward orientations. Therefore, the device in question may be oriented in other ways (rotated 90 degrees or in other orientations) and interpreted in the relative description of space here.

[0031] In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, so that the features, processes, operations, methods, elements, components, systems, products or devices containing a series of units are not necessarily limited to those units, but may include other units that are not clearly listed or inherent to these features, processes, operations, methods, elements, components, systems, products or devices. The term "determine" covers a wide range of actions, which may include acquisition, calculation, calculation, processing, derivation, investigation, search (e.g., search in a table, database or other data structure), ascertainment, and similar actions, and may also include receiving (e.g., receiving information), accessing (e.g., accessing data in a memory) and similar actions, and may also include generating, creating, establishing and similar actions, as well as parsing, selecting, selecting and similar actions, etc. The "one", "one", "a kind", "the" and other similar words involved in this application do not represent quantitative restrictions and may represent singular or plural. The relevant definitions of other terms will be given in the following description.

[0032] It should be noted that when an element is considered to be "connected" to another element, it can be directly connected to another element, or connected to another element through a centering element. In addition, the "connection" in the following embodiments should be understood as "electrical connection", "communication connection", etc. if there is a transmission of electrical signals or data between the connected objects. Similarly, when a component is considered to be "set on" another component, it can be directly set on another component or there may be a centering component at the same time. In contrast, when similar units such as elements or components are referred to as "directly on...", "directly engaged with...", "directly connected to" or "directly connected to" another element or component, there may not be an element or component between them. Other words used to describe the relationship between elements should be interpreted in a similar manner (for example, "between..." and "directly between...", "adjacent" and "directly adjacent", etc.).

[0033] The drawings are for illustrative purposes only and should not be construed as limiting the present patent;

[0034] In order to better illustrate the present embodiment, some parts in the drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product;

[0035] It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0036] In order to make the purpose, features and advantages of the present application more obvious and easy to understand, the technical solution of the present invention will be further explained below in conjunction with the drawings and embodiments. Obviously, the embodiments described below are only part of the embodiments of the present application, rather than all of the embodiments.

[0037] Example 1

[0038] This embodiment provides a single-polarized quasi-isotropically radiating flexible conductive fabric antenna. Figure 1 , Figure 2 , comprising a felt substrate 1, a front conductive fabric, a back conductive fabric and a feeding coaxial line;

[0039] Wherein, the front conductive fabric is arranged on the front side of the felt substrate 1, the back conductive fabric is arranged on the back side of the felt substrate 1, and the front conductive fabric and the back conductive fabric are centrally symmetrical about the center point of the felt substrate 1 and are connected via the feeding coaxial line; and,

[0040] The front conductive fabric includes a front L-shaped conductive fabric 201 and a front linear conductive fabric 202, and the back conductive fabric includes a back L-shaped conductive fabric 301 and a back linear conductive fabric 302. Quasi-isotropic radiation is achieved and the radiation polarization zero point of the antenna is eliminated through the front L-shaped conductive fabric 201, the front linear conductive fabric 202, the back L-shaped conductive fabric 301 and the back linear conductive fabric 302.

[0041] In some preferred embodiments, the front L-shaped conductive fabric 201 and the back L-shaped conductive fabric 301 , as well as the front linear conductive fabric 202 and the back linear conductive fabric 302 are respectively centrally symmetrical about the center point of the felt substrate 1 .

[0042] In some optional embodiments, the vertical segments of the front L-shaped conductive fabric 201 and the back L-shaped conductive fabric 301 are parallel to the vertical edges of the felt substrate 1 , and the horizontal segments of the front L-shaped conductive fabric 201 and the back L-shaped conductive fabric 301 are parallel to the horizontal edges of the felt substrate 1 .

[0043] In some optional embodiments, the front L-shaped conductive fabric 201 and the back L-shaped conductive fabric 301 are respectively placed horizontally along the center of the felt substrate 1 and are centrally symmetrically distributed about the center point of the felt substrate 1 .

[0044] Furthermore, the front linear conductive fabric 202 is disposed directly above the rear L-shaped conductive fabric 301 ; and the rear linear conductive fabric 302 is disposed directly below the front L-shaped conductive fabric 201 .

[0045] Furthermore, the front linear conductive fabric 202 is parallel to the vertical section of the front L-shaped conductive fabric 201 , and the back linear conductive fabric 302 is parallel to the vertical section of the back L-shaped conductive fabric 301 .

[0046] See also Figure 3 In some preferred embodiments, the center point of the front linear conductive fabric 202 is set at the lower half of the felt substrate 1, and the center point of the back linear conductive fabric 302 is set at the upper half of the felt substrate 1.

[0047] In some preferred embodiments, the front L-shaped conductive fabric 201 is spaced apart from the front linear conductive fabric 202, and the back L-shaped conductive fabric 301 is spaced apart from the back linear conductive fabric 302, and the spacing distance is determined based on the corresponding size of the front L-shaped conductive fabric 201 or the back L-shaped conductive fabric 301.

[0048] In some preferred embodiments, the length of the front linear conductive fabric 202 and / or the back linear conductive fabric 302 is greater than a quarter wavelength of the antenna operating frequency and less than a half wavelength of the antenna operating frequency.

[0049] In some preferred embodiments, the length of the front L-shaped conductive fabric 201 and / or the back L-shaped conductive fabric 301 is determined according to the performance and impedance matching requirements of the antenna.

[0050] In some specific implementations, the flexible conductive fabric antenna operates at 3.0 GHz, such as Figure 4 Shown is its radiation pattern at 3.0 GHz.

[0051] Figure 5 The figure shows the radiation pattern comparison between the flexible conductive fabric antenna and the traditional antenna, where Figure 5 (a) is the radiation pattern of a traditional antenna, and (b) is the flexible conductive fabric antenna described in this embodiment. It should be noted that in the above embodiment, due to the phase change introduced by the length of the L-shaped conductive fabric structure, the current on the linear conductive fabric at both ends and the current in the middle section form a combination of five dipoles with different phases, and their directional patterns are combined and superimposed to form quasi-isotropic radiation. Due to this special combination, the defects of the radiation patterns can be compensated for each other, thereby eliminating the radiation polarization zero point of the antenna.

[0052] In some preferred embodiments, the feeding coaxial line includes an inner conductor 401 and an outer conductor 402 ; wherein the inner conductor 401 is connected to the front L-shaped conductive fabric 201 , and the outer conductor 402 is connected to the back L-shaped conductive fabric 301 .

[0053] In some optional embodiments, the inner conductor 401 is disposed at the center point of the felt substrate 1 .

[0054] Example 2

[0055] This embodiment provides a wireless communication module, including the flexible conductive fabric antenna described in Embodiment 1.

[0056] This embodiment provides a wireless communication device, which uses the flexible conductive fabric antenna or the wireless communication module proposed in the above embodiments.

[0057] In some specific implementations, the flexible conductive fabric antenna is integrated into clothing, footwear, headwear, wristbands, chest straps, belts, home textiles, automotive textiles, or robots.

[0058] It can be understood that the options in the above-mentioned embodiment 1 are also applicable to this embodiment, so they will not be described again here.

[0059] The same or similar reference numerals correspond to the same or similar components;

[0060] The terms used to describe the positional relationship in the drawings are only used for illustrative purposes and should not be construed as limiting the present application;

[0061] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application may be combined with each other.

[0062] In different specific implementations, the methods or systems described herein may be implemented in software, hardware, or a combination thereof. In addition, the order of the steps of the method may be changed, and various elements may be added, reordered, combined, omitted, modified, etc. In certain example embodiments, well-known processes, well-known device structures, and well-known technologies are not described in detail.

[0063] Obviously, the above-mentioned embodiments of the present application are merely examples for clearly illustrating the present application, and are not intended to limit the implementation methods of the present application, and are not intended to limit the present application. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. Each discrete structure / function module or unit can be integrated together to form an independent part, or each module can exist separately, or two or more modules can be integrated to form an independent part, and the structure and function of the discrete components can be implemented as a combined structure or component. It is not necessary and impossible to enumerate all the implementation methods here. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application should be included in the scope of protection of the claims of the present application.

Claims

1. A flexible conductive fabric antenna with single-polarization quasi-isotropic radiation, characterized in that: It includes a felt substrate, a front conductive fabric, a back conductive fabric and a feeding coaxial line; Wherein, the front conductive fabric is arranged on the front side of the felt substrate, the back conductive fabric is arranged on the back side of the felt substrate, and the front conductive fabric and the back conductive fabric are centrally symmetrical about the center point of the felt substrate and are connected via the feeding coaxial line; and, The front conductive fabric includes a front L-shaped conductive fabric and a front linear conductive fabric, and the back conductive fabric includes a back L-shaped conductive fabric and a back linear conductive fabric. Quasi-isotropic radiation is achieved and the radiation polarization zero point of the antenna is eliminated by the front L-shaped conductive fabric, the front linear conductive fabric, the back L-shaped conductive fabric and the back linear conductive fabric.

2. The single-polarized quasi-isotropically radiating flexible conductive fabric antenna according to claim 1, characterized in that: The front L-shaped conductive fabric and the back L-shaped conductive fabric, and the front linear conductive fabric and the back linear conductive fabric are respectively centrally symmetrical about the center point of the felt substrate.

3. The single-polarized quasi-isotropically radiating flexible conductive fabric antenna according to claim 2, characterized in that: The front L-shaped conductive fabric and the back L-shaped conductive fabric are respectively placed horizontally along the center of the felt substrate and are centrally symmetrically distributed about the center point of the felt substrate.

4. The single-polarized quasi-isotropically radiating flexible conductive fabric antenna according to claim 3, characterized in that: The front linear conductive fabric is arranged directly above the back L-shaped conductive fabric; the back linear conductive fabric is arranged directly below the front L-shaped conductive fabric.

5. The single-polarized quasi-isotropically radiating flexible conductive fabric antenna according to claim 1, characterized in that: The center point of the front linear conductive fabric is arranged at the lower half of the felt substrate, and the center point of the back linear conductive fabric is arranged at the upper half of the felt substrate.

6. The single-polarized quasi-isotropically radiating flexible conductive fabric antenna according to claim 1, characterized in that: The front L-shaped conductive fabric is spaced apart from the front linear conductive fabric, and the back L-shaped conductive fabric is spaced apart from the back linear conductive fabric, and the spacing distance is determined based on the size of the corresponding front L-shaped conductive fabric or the back L-shaped conductive fabric.

7. The single-polarized quasi-isotropically radiating flexible conductive fabric antenna according to claim 1, characterized in that: The length of the front linear conductive fabric and / or the back linear conductive fabric is greater than a quarter wavelength of the antenna operating frequency and less than a half wavelength of the antenna operating frequency.

8. The single-polarized quasi-isotropically radiating flexible conductive fabric antenna according to claim 1, characterized in that: The length of the front L-shaped conductive fabric and / or the back L-shaped conductive fabric is determined according to the performance and impedance matching requirements of the antenna.

9. A single-polarized quasi-isotropically radiating flexible conductive fabric antenna according to any one of claims 1 to 8, characterized in that: The feeding coaxial line includes an inner conductor and an outer conductor; wherein the inner conductor is connected to the front L-shaped conductive fabric, and the outer conductor is connected to the back L-shaped conductive fabric.

10. The single-polarized quasi-isotropically radiating flexible conductive fabric antenna according to claim 5, characterized in that: The inner conductor is arranged on the center point of the felt substrate.

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