Compact dual-frequency multi-linear polarization reconfigurable antenna

Abstract

The invention discloses a compact dual-frequency multi-linear polarization reconfigurable antenna. An existing multi-linear polarization reconfigurable antenna generally can only work in a continuous frequency range and cannot support large-span double-frequency-point work. According to the invention, the elliptical patch, the spring-shaped branch knot and the strip-shaped branch knot are integrated as monopole radiators, so that large-span double-frequency work is realized. And then the monopole radiators are rotationally and symmetrically distributed, and a radio frequency switching diode and a direct current biasing circuit are combined, so that switching of multi-linear polarization working states is realized, the multipath fading benefit of wireless signals can be effectively suppressed, and the problem of polarization mismatch can be effectively solved. The dual-frequency multi-linear polarization reconfigurable antenna has practical benefits for realizing a compact dual-frequency multi-linear polarization reconfigurable antenna design.

Description

Technical Field

[0001] The present invention relates to the field of polarization reconfigurable antenna technology, and in particular to a compact dual-frequency multi-linear polarization reconfigurable antenna. Background Art

[0002] In the field of wireless communications, multi-polarization reconfigurable antennas (MROs) have attracted significant industry attention in recent years because they can switch polarization states in real time, suppressing signal multipath fading and improving communication link stability. However, existing MROs typically operate within a single frequency band and are unable to support dual-band systems, particularly those with a wide frequency span. For example, human body wireless local area networks (BWANs) typically operate in two wide frequency bands: the MICS band (403-405 MHz) for implantable devices and the ISM 2.45 GHz (2.45-2.48 GHz) for medical wireless networks. While some MROs achieve wideband coverage or integrate frequency reconfiguration, they still operate only within a single continuous frequency band and lack effective support for dual-band systems with a wide frequency span. Furthermore, since antenna size is generally inversely proportional to its operating frequency, simply integrating two antennas operating at different frequencies into a MRO design often results in excessive overall size, especially for systems with a wide frequency span. In order to solve the above problems, achieving dual-frequency operation in a compact structure has become an urgent research area for multi-polarization reconfigurable antennas. Summary of the Invention

[0003] In order to overcome the shortcomings and deficiencies of the prior art, an object of the present invention is to provide a compact dual-frequency multi-polarization reconfigurable antenna.

[0004] The purpose of the present invention is achieved through the following contents:

[0005] A compact dual-band multi-polarization reconfigurable antenna, comprising a single-layer dielectric substrate, five multi-branch monopole radiators, a feed plate, and a ground plane;

[0006] Furthermore, the five multi-branch monopole radiators and the feed sheet are printed on the upper surface of the single-layer dielectric substrate; the floor is printed on the lower surface of the single-layer dielectric substrate;

[0007] Furthermore, the multi-branch monopole radiator is composed of a feeder, a strip-shaped branch, a spring-shaped branch, an elliptical patch and a DC pad;

[0008] Furthermore, the feed sheet is printed in the middle of the single-layer dielectric substrate;

[0009] Furthermore, the five multi-branch monopole radiators are rotationally symmetrically distributed around the feeding plate;

[0010] Furthermore, a radio frequency switching diode is welded between the feed line and the feed plate;

[0011] Furthermore, the pair of strip-shaped branches are symmetrically distributed on both sides of the feeder;

[0012] Furthermore, the spring-shaped branch is connected to the end of the feeder;

[0013] Furthermore, a high-frequency inductor is welded between the elliptical patch and the rear end of the spring branch;

[0014] Furthermore, a high-frequency inductor is welded between the DC welding pad and the end of the elliptical patch.

[0015] Beneficial effects

[0016] The present invention provides a compact dual-frequency multi-polarization reconfigurable antenna, which has the following beneficial effects:

[0017] 1. Able to achieve dual-frequency operation with a large span

[0018] A multi-branch monopole radiator is used as the radiating unit. The elliptical patch for low-frequency radiation and a pair of strip branches for high-frequency radiation are integrated into a compact structure through spring branches, realizing dual-frequency operation with a large span.

[0019] 2. Five-wire polarization reconfiguration capability

[0020] Five multi-branch monopole radiators are evenly distributed on the surface of the dielectric substrate using rotational symmetry to form five different linear polarization directions. The operation of the multi-branch monopole radiators in different directions is controlled by turning on and off the RF switch diode, thus forming a five-linear polarization reconfigurable system. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of a compact dual-frequency multi-polarization reconfigurable antenna structure of the present invention;

[0022] Figure 2 is a return loss curve of an embodiment of the present invention;

[0023] Figure 3 is the directional pattern of an embodiment of the present invention at 2.45 GHz;

[0024] Figure 4 is the directional pattern of an embodiment of the present invention at 400 MHz; DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solutions and advantages of the present invention more clear, the following is combined with specific embodiments and with reference to the attached drawings. Figure 1-4 , the present invention is described in further detail.

[0026] like Figure 1As shown, a schematic diagram of the structure of a compact dual-band multi-polarization reconfigurable antenna is shown, which includes five multi-branch radiators 1, a feed plate 2, a single-layer dielectric substrate 3 and a ground plane 4.

[0027] The five multi-branch radiators and the feed plate are printed on the upper surface of the single-layer dielectric substrate, and the floor is printed on the lower surface of the single-layer dielectric substrate.

[0028] Furthermore, the feed plate is located in the middle of the upper surface of the single-layer dielectric substrate, and the floor is located in the middle of the lower surface of the single-layer dielectric substrate.

[0029] Furthermore, the five multi-branch radiators are distributed in rotational symmetry.

[0030] Furthermore, the multi-branch radiator includes a feeder 1A, a strip-shaped branch 1B, a spring branch 1C, an elliptical patch 1D and a DC pad 1F.

[0031] Furthermore, the strip branches are located on both sides of the feeder, a high-frequency inductor is welded between the spring branches and the feeder, the elliptical patch is located at the end of the spring branch, and a high-frequency inductor is welded between the DC pad and the elliptical patch.

[0032] Specifically, the single-layer dielectric substrate has a model of R04003, a thickness of 1.5 mm, and a diameter of 160 mm.

[0033] Specifically, the feeding plate is pentagonal with a side length of 4.3 mm.

[0034] Specifically, the feed line has a length of 7 mm and a width of 1.8 mm.

[0035] Specifically, the strip-shaped branch has a length of 22 mm and a width of 1.6 mm.

[0036] Specifically, the spring-shaped branch has a length of 206 mm and a width of 1.0 mm.

[0037] Specifically, the elliptical patch has a length of 30 mm and a width of 18 mm.

[0038] Specifically, the DC pad is rectangular with a length of 2 mm and a width of 1 mm.

[0039] Specifically, the floor is a pentagon with a side length of 14.5 mm.

[0040] The specific embodiments described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above are only specific embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of the present invention.

Claims

1. A compact dual-band multi-polarization reconfigurable antenna, characterized in that: It includes a single-layer dielectric substrate, five multi-branch monopole radiators, a feed plate and a ground plate; the multi-branch monopole radiators and the feed plate are printed on the upper surface of the single-layer dielectric substrate; The floor is printed on the lower surface of the single-layer dielectric substrate.

2. A compact dual-band multi-polarization reconfigurable antenna according to claim 1, characterized in that: The feeding plate is pentagonal and located at the center of the upper surface of the single-layer dielectric substrate, and the floor is pentagonal and located at the center of the lower surface of the single-layer dielectric substrate.

3. The compact dual-band multi-polarization reconfigurable antenna according to claim 1, characterized in that: The feed line is connected to the feed plate via a radio frequency switch diode.

4. The compact dual-band multi-polarization reconfigurable antenna according to claim 1, characterized in that: The multi-branch monopole radiator includes a feed line, a pair of strip-shaped branches, a spring-shaped branch, an elliptical patch and a DC pad.

5. The compact dual-band multi-polarization reconfigurable antenna according to claim 1, characterized in that: The five multi-branch monopole radiators are evenly distributed in a rotationally symmetrical manner.

6. The compact dual-band multi-polarization reconfigurable antenna according to claim 4, characterized in that: The pair of strip-shaped branches are symmetrically distributed on both sides of the multi-branch monopole radiator, the spring-shaped branch is located in the middle of the multi-branch monopole radiator, and the end of the spring-shaped branch is connected to the elliptical patch.

7. The compact dual-band multi-polarization reconfigurable antenna according to claim 4, characterized in that: The pair of strip-shaped branches are connected to both sides of the end of the feeder line, and a high-frequency inductor is welded between the spring-shaped branch and the end of the feeder line.

8. The compact dual-band multi-polarization reconfigurable antenna according to claim 4, characterized in that: A high-frequency inductor is welded between the DC welding pad and the elliptical patch.

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