CN110492242A - A kind of ultra-thin half short circuit round polarization top radiating antenna - Google Patents

Abstract

The present invention provides a kind of ultra-thin half short circuit round polarization top radiating antennas, including rectangular radiation microband paste, medium substrate, metal base plate, first short circuit metal pin and radio-frequency joint, the rectangular radiation microband paste is attached to the one side of medium substrate, it is fixedly connected between the another side of the medium substrate and the metal base plate, there are four the first short circuit metal pin settings and it penetrates the rectangular radiation microband paste, medium substrate and metal base plate simultaneously connect between the metal base plate, the radio-frequency joint is mounted on the metal base plate other side opposite with medium substrate, coaxial probe inside the radio-frequency joint is welded to connect across the medium substrate and the rectangular radiation microband paste.The problems such as there are single layer short-circuit wall paster antenna efficiency in single-point feedback to solve existing radiating antenna lower, unstable orientation direction figure.

Description

An ultra-thin half-wall short-circuit circularly polarized top radiating antenna

technical field

The invention belongs to the technical field of wireless communication antennas, and in particular relates to an ultra-thin half-wall short-circuit circularly polarized top radiation antenna.

Background technique

In recent years, with the popularization and application of satellite navigation systems, both military and civilian fields have put forward new requirements for satellite navigation antennas. Due to the relative movement between the satellite and the ground, in order to ensure that different places on the ground can receive satellite signals, circularly polarized antennas become the best option for satellite communications. Since the antenna is installed on the satellite, it is required to radiate from the top of the antenna to achieve unidirectional radiation to the ground. Patch antennas are widely used in wireless communication systems due to their light weight, small size, and easy conformality.

Traditional rectangular patch antennas usually use perturbation to achieve circular polarization. In order to reduce the size of the antenna, a short-circuit wall antenna is used. At present, the circular polarization technology of single-layer short-circuited wall microstrip antenna generally adopts sequential helical placement of antenna elements, multi-port feeding or multi-layer structure to realize the circular polarization performance of short-circuited wall patch antenna. Existing Technology 1 Realizing circular polarization of short-circuited wall patch antennas Generate broadband circularly polarized radiation by using subarrays with equal amplitudes and 90° phase differences. The second prior art realizes the circular polarization of the short-circuited wall patch antenna and generates a circularly polarized radiation field by feeding power through two ports. Existing Technology 3 Realizing Circular Polarization of the Short-Circuit Wall Patch Antenna Through a multi-layer structure, a pair of orthogonally oriented short-circuit wall antennas are stacked to achieve circular polarization performance.

However, both technology 1 and technology 2 require a feed network, so the antenna structure is complex, the cost is high, and many materials are used, which is difficult to process. The multi-layer structure adopted by technology 3 will increase the profile of the antenna, which is not conducive to the utilization of low-profile antennas. In the case of single-point feeding, there are disadvantages in the use of the single-layer short-circuit wall patch antenna, such as low efficiency and complex structure.

Contents of the invention

The technical problem to be solved by the present invention is to provide an ultra-thin half-wall short-circuit circularly polarized top radiating antenna to solve the problem of single-layer short-circuit wall in the case of single-point feeding proposed in the above-mentioned background technology. Patch antennas have problems such as low efficiency and complex structure.

In order to solve the above-mentioned technical problems, the technical solution adopted in the present invention is: a kind of ultra-thin half-wall short-circuit circularly polarized top radiation antenna, comprising a rectangular radiation microstrip patch, a dielectric substrate, a metal base plate, a first metal short-circuit pin and a radio frequency connector, The rectangular radiating microstrip patch is attached to one side of the dielectric substrate, and the other side of the dielectric substrate is fixedly connected to the metal bottom plate. There are four first metal short-circuit pins and they penetrate all The rectangular radiating microstrip patch, the dielectric substrate and the metal substrate are connected with the metal substrate, the radio frequency connector is installed on the opposite side of the metal substrate and the dielectric substrate, and the coaxial cable inside the radio frequency connector The probe passes through the dielectric substrate and is welded to the rectangular radiation microstrip patch.

Preferably, a linear groove with a length of 0.15λ is opened on the rectangular radiating microstrip patch, and there is no metal element inside the linear groove.

Preferably, the dielectric substrate is specifically a substrate sheet based on the formation principle of a substrate-integrated waveguide, and a row of second metal short-circuit pins is installed on the dielectric substrate along the edge of the rectangular radiating microstrip patch.

Preferably, the thickness of the dielectric substrate is less than 0.028λ.

Preferably, the rectangular radiating microstrip patch has a length of 0.46λ and a width of 0.23λ.

Preferably, the radius of the first metal short-circuit pins is 1.2mm, and the distance between them is set at 0.5mm.

Preferably, the outer layer of the radio frequency connector is fixedly connected to the metal bottom plate.

Compared with the prior art, the present invention has the following advantages:

1. In the present invention, four first metal short-circuit pins are equidistantly arranged on the side near the radiation side of the rectangular radiation microstrip patch, and the first metal short-circuit pins are used to adjust the resonance of the TM _0,1/2 mode of the antenna Frequency point: The radius of the first metal short-circuit pin is 1.2mm, and the spacing is 0.5mm. By adjusting the first metal short-circuit pin and the linear slot of the rectangular radiation microstrip patch, the circular polarization of the ultra-thin half-wall short-circuit circularly polarized top radiation antenna is realized. characteristics; and the dielectric substrate based on the formation principle of the substrate integrated waveguide is located in the middle layer of the antenna, and the second metal short-circuit pin is punched along the edge of the rectangular radiation microstrip patch on the dielectric substrate to reduce the cross-sectional size of the antenna, and the thickness of the dielectric substrate Less than 0.028λ, realizing the low-profile characteristics of the antenna.

2. The radiating antenna of the present invention adopts single-point feeding to radiate circularly polarized electromagnetic waves. The whole antenna has low-profile characteristics. The overall size of the antenna is 0.46λ×0.23λ, and the thickness of the antenna is less than 0.028λ, so that the antenna section size is smaller than the traditional circle Polarized microstrip antenna, by punching a second metal short-circuit pin on the edge of the dielectric substrate, the edge is equivalent to an ideal electric wall, so that the electromagnetic wave propagates in the cavity between the upper and lower surfaces of the dielectric and the through hole, reducing the cross-sectional size of the antenna ; By loading and adjusting the first metal short-circuit pin, the resonant frequency of TM _0,1/2 mode is moved to high frequency, while keeping the resonant frequency of TM _1,1/2 mode unchanged, and the resonant frequency of the two modes is shortened Point distance, and finally use two orthogonal modes TM _0,1/2 mode and TM _1,1/2 mode to achieve circular polarization, so that the antenna can minimize the antenna pair while ensuring the high performance of the antenna during use. The influence of the shape of the carrier. In addition, the antenna of the present invention has a simple structure and can be widely used in many different scenarios such as navigation satellites, radars, and mobile communications.

Description of drawings

Fig. 1 is a schematic diagram of the overall structure of the present invention;

Fig. 2 is a sectional view of the overall structure of the present invention.

Fig. 3 is a curve diagram of the reflection coefficient of the port of the ultra-thin half-wall short-circuit circularly polarized top radiation antenna of the present invention.

Fig. 4 is an axial ratio curve diagram of the ultra-thin half-wall short-circuit circularly polarized tip radiation antenna of the present invention.

Fig. 5 is a Phi=90° plane pattern of the ultra-thin half-wall short-circuit circularly polarized top radiation antenna of the present invention at a low frequency of 2.78 GHz.

Fig. 6 is a Phi=0° plane pattern of the ultra-thin half-wall short-circuit circularly polarized tip radiation antenna of the present invention at a low frequency of 2.78 GHz.

Fig. 7 is the gain change of the ultra-thin half-wall short-circuit circularly polarized tip radiation antenna port of the present invention.

Explanation of reference signs:

1-rectangular radiating microstrip patch; 2-dielectric substrate; 3-metal base plate; 4-first metal short-circuit pin; 5-linear slot; 6-second metal short-circuit pin; 7-radio frequency connector; 8-coaxial probe Needle.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

Embodiment 1, as shown in Figure 1 and Figure 2, the present invention provides a technical solution: an ultra-thin half-wall short-circuit circularly polarized top radiation antenna, including a rectangular radiation microstrip patch 1, a dielectric substrate 2, and a metal base plate 3 , the first metal short-circuit pin 4 and the radio frequency joint 7, the rectangular radiating microstrip patch 1 is attached to one side of the dielectric substrate 2, wherein the rectangular radiating microstrip patch 1 is manufactured by a printed circuit process, and the rectangular radiating microstrip patch 1 The length of 1 is 0.46λ, the width is 0.23λ, and it is printed on the dielectric substrate 2. At the same time, a through hole for passing through the coaxial probe 7 is punched on the side of the rectangular radiation microstrip patch 1 away from the radiation gap. The coaxial probe 7 feeds the rectangular radiating microstrip patch 1; the rectangular radiating microstrip patch 1 is provided with a linear slot 5 with a length of 0.15λ, and there is no metal element inside the linear slot 5. 5 to adjust the impedance matching of the antenna.

The other side of the dielectric substrate 2 is fixedly connected to the metal bottom plate 3, the thickness of the dielectric substrate 2 is less than 0.028λ, and the dielectric substrate 2 is specifically a substrate based on the formation principle of the substrate integrated waveguide. A row of second metal short-circuit pins 6 is mounted on the substrate 2 along the edge of the rectangular radiating microstrip patch 1 to reduce the cross-sectional size of the antenna.

The first metal short-circuit pin 4 is provided with four, and it penetrates the rectangular radiating microstrip patch 1, the dielectric substrate 2 and the metal bottom plate 3 and connects with the metal bottom plate 3 to adjust the TM of the antenna. The resonant frequency point of _0,1/2 mode; and the radius of the first metal short-circuit pin 4 is 1.2mm, and the spacing is 0.5mm, and the ultra-thin is realized by adjusting the first metal short-circuit pin 4 and the linear groove 5 of the rectangular radiation microstrip patch Circular Polarization Characteristics of Half-Wall Short Circuit Circularly Polarized Tip Radiating Antenna

The radio frequency connector 7 is installed on the other side of the metal base plate 3 opposite to the dielectric substrate 2, and the coaxial probe 8 inside the radio frequency connector 7 passes through the dielectric substrate 2 and the rectangular radiation microstrip patch 1, and the outer layer of the radio frequency connector 7 is fixedly connected to the metal bottom plate 3.

In this embodiment, the principle of realizing the low-profile characteristics of the antenna is: by setting the second metal short-circuit pin 6 at the edge of the dielectric substrate 2, the edge of the dielectric substrate 2 is equivalent to an ideal electric wall, so that the electromagnetic wave is in the dielectric substrate 2. The cavity propagation between the upper and lower surfaces and the second metal short-circuit pin 6 reduces the cross-sectional size of the antenna. The principle of realizing circular polarization characteristics: change the resonance frequency point of TM _0,1/2 mode by adjusting the first metal short-circuit pin 4, and use two orthogonal modes TM _0,1/2 mode and TM _1,1/2 mode achieve circular polarization.

Embodiment 2, the application effect of the present invention will be described in detail below in conjunction with simulation.

1. Simulation content

Please refer to Figure 3 to Figure 7. The port reflection coefficient, antenna pattern and gain of the antenna in Embodiment 1 are simulated by using simulation software.

2. Simulation results

Fig. 3 is the reflection coefficient curve figure of ultra-thin half-wall short-circuit circularly polarized top radiation antenna port of the present invention, and Fig. 4 is the axial ratio curve figure of ultra-thin half-wall short-circuit circularly polarized top radiation antenna of the present invention, as can be seen, port The frequency band whose reflection coefficient is lower than -10dB is 2.69GHz-2.84GHz, accounting for 5.4%, and the 3dB axial ratio bandwidth is 2.76GHz-2.80GHz, accounting for 1.4%. The characteristics of the circular polarization of the antenna are well realized, which can meet the requirements of the satellite navigation system for the circular polarization.

Fig. 5 is the Phi=90° plane pattern of the ultra-thin half-wall short-circuit circularly polarized top radiation antenna of the present invention at a low frequency of 2.78GHz, and Fig. 6 is the ultra-thin half-wall short-circuit circularly polarized top radiation antenna of the present invention at a low frequency of 2.78GHz Phi=0° surface pattern, it can be seen that the antenna has a stable top radiation pattern, and the half-power beam width reaches 110 degrees, which is conducive to the application in satellite communication systems.

Fig. 7 shows the gain variation of the ultra-thin half-wall short-circuit circularly polarized top radiation antenna port of the present invention. It can be obtained that the gain is greater than 4dBic within the 3dB axial ratio bandwidth of 2.76GHz-2.80GHz, and the gain conforms to the antenna size.

It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is a relationship between these entities or operations. any such actual relationship or order exists between them. Furthermore, the term "comprises", "comprises" or any other variation thereof is intended to cover a non-exclusive inclusion such that a process, method, article, or apparatus comprising a set of elements includes not only those elements, but also includes elements not expressly listed. other elements of or also include elements inherent in such a process, method, article, or device.

Although the embodiments of the present invention have been shown and described, those skilled in the art can understand that various changes, modifications and substitutions can be made to these embodiments without departing from the principle and spirit of the present invention. and modifications, the scope of the invention is defined by the appended claims and their equivalents.

Claims (7)

1. An ultra-thin half-wall short-circuit circularly polarized top radiation antenna, characterized in that: comprising a rectangular radiation microstrip patch (1), a dielectric substrate (2), a metal base plate (3), the first metal short-circuit pin (4) and a radio frequency joint (7), the rectangular radiating microstrip patch (1) is attached to one side of the dielectric substrate (2), and between the other side of the dielectric substrate (2) and the metal base plate (3) Fixed connection, the first metal short-circuit pin (4) is provided with four and it penetrates the rectangular radiation microstrip patch (1), the dielectric substrate (2) and the metal bottom plate (3) and connects with the metal bottom plate (3), the radio frequency connector (7) is installed on the other side of the metal base plate (3) opposite to the dielectric substrate (2), and the coaxial probe (8) inside the radio frequency connector (7) ) passing through the dielectric substrate (2) and welding connection between the rectangular radiating microstrip patch (1). 2. a kind of ultra-thin half-wall short-circuit circularly polarized top radiating antenna according to claim 1, is characterized in that, on the described rectangular radiating microstrip patch (1), offer a linear groove (5) that a length is 0.15λ ), there is no metal element inside the linear groove (5). 3. A kind of ultra-thin half-wall short-circuit circularly polarized top radiation antenna according to claim 2, characterized in that, the dielectric substrate (2) is specifically a substrate sheet based on the formation principle of the substrate integrated waveguide, and in the A row of second metal short-circuit pins (6) is installed on the dielectric substrate (2) along the edge of the rectangular radiating microstrip patch (1). 4. An ultra-thin half-wall short-circuit circularly polarized tip radiation antenna according to claim 1, characterized in that the thickness of the dielectric substrate (2) is less than 0.028λ. 5. A kind of ultra-thin half-wall short-circuit circularly polarized tip radiation antenna according to claim 1, characterized in that, the length of the rectangular radiation microstrip patch (1) is 0.46λ, and the width is 0.23λ. 6. A kind of ultra-thin half-wall short-circuit circularly polarized top radiation antenna according to claim 1, characterized in that, the radius of the first metal short-circuit pin (4) is 1.2mm, and the distance between them is set at 0.5mm. 7. An ultra-thin half-wall short-circuit circularly polarized tip radiation antenna according to claim 1, characterized in that, the outer layer of the radio frequency connector (7) is fixedly connected to the metal bottom plate (3).