CN203039097U - Circularly polarized leaky-wave antenna - Google Patents

Abstract

The utility model discloses a circularly polarized leaky-wave antenna, which comprises, from top to bottom: an upper metal layer (301), a first middle conductive medium layer (302), a middle metal layer (303), a second An intermediate conductive medium layer (304) and a lower metal layer (305) having electrodes; the upper metal layer (301) includes an antenna patch pattern (40), and the middle metal layer (303) includes a feeder pattern (60), The feeder pattern (60) forms a diode feeder; the antenna patch pattern (40) and the feeder pattern (60) are connected through a via hole in the first intermediate conductive medium layer (302); the feeder pattern (60) It is connected with the electrode of the lower metal layer (305) through the via hole of the second intermediate conductive medium layer (304). The circular polarization leaky wave antenna provided by the utility model has good circular polarization effect.

Description

A Circularly Polarized Leaky Wave Antenna

technical field

The utility model relates to antenna technology, in particular to a circularly polarized leaky-wave antenna.

Background technique

At present, circularly polarized electrically controlled linearly polarized leaky-wave antennas loaded with diodes are usually used to obtain circularly polarized leaky-wave antennas, and the circular polarization does not change the diode feeder of the linearly polarized leaky-wave antennas. The existing circularly polarized leaky-wave antenna, as shown in Figure 1, generally includes an upper metal layer 101, an intermediate conductive medium layer 102, and a lower metal layer 103 from top to bottom, wherein the upper metal layer 101 includes antennas connected to each other The patch pattern and the feeder pattern, the lower metal layer 103 is the bottom plate, the antenna patch pattern and the lower metal layer 103 are connected through the via holes in the middle conductive medium layer 102, and the middle conductive medium layer 102 is used to gather electromagnetic energy.

As shown in Figure 2, the antenna patch pattern 20 includes an antenna feeder 201 and several cascaded patch units 202, each patch unit 202 is connected with a varactor diode 203, and the patch unit 202 includes a square 2021 and The short stub 2022 is connected directly below the square 2021 , and the short stub 2022 has a slot 2023 for placing the variable capacitance diode 203 . There is a small hole 2024 below the slot 2023 , and the small hole 2024 corresponds to the via hole of the middle conductive medium layer 102 .

The feeder pattern 21 forms a diode feeder to provide a DC bias voltage for each of the varactor diodes 203. The feeder pattern 21 includes a number of cascaded feeder subunits 211, wherein the feeder subunits 211 with an odd serial number are connected together. Even-numbered feeder subunits 211 are connected together. The feeder subunit 211 includes a radiation stub 211 and a DC feeder 212 . The role of the short radiation line 211 is to realize the electrical dimension of a quarter wavelength with a small volume, and the DC feeder 212 with an appropriate length can realize a short circuit to the radio frequency signal, so that the radio frequency signal flows to the short radiation line 211 without It is more coupled into the DC feeder 212 .

For a linearly polarized leaky-wave antenna, the radiation of the radiation stub 211 only has a certain influence on the direction of the main lobe, so it is only necessary to ensure that the coupling of the RF signal to the DC feeder 212 is small, and the radiation effect of the radiation stub 211 is not considered. However, the circularly polarized leaky-wave antenna has a high requirement on the axial ratio, and the influence of the radiation of the short radiation line 211 on the axial ratio will seriously reduce the circular polarization effect.

Utility model content

In view of this, the main purpose of the present utility model is to provide a circularly polarized leaky wave antenna, which can have a good circularly polarized effect.

In order to achieve the above object, the technical solution of the utility model is achieved in that:

The utility model provides a circularly polarized leaky-wave antenna. The antenna comprises from top to bottom: an upper metal layer 301, a first middle conductive medium layer 302, a middle metal layer 303, a second middle conductive medium layer 304 and a lower metal layer 305 with electrodes;

The upper metal layer 301 includes an antenna patch pattern 40, the middle metal layer 303 includes a feeder pattern 60, and the feeder pattern 60 forms a diode feeder;

The antenna patch pattern 40 and the feeder pattern 60 are connected through a via hole in the first intermediate conductive medium layer 302;

The feeder pattern 60 is connected to the electrode of the lower metal layer 305 through the via hole of the second intermediate conductive medium layer 304 .

Preferably, the feeder pattern 60 includes several cascaded feeder subunits 601, the feeder subunits 601 include interconnected short radiating lines 6011 and DC feeders 6012, and the opening angle of the short radiating lines 6011 is 60 degrees, so The width of the DC feeder 6012 is 0.006λg.

Preferably, the radius of the short radiation line 6011 is 0.15λg to 0.18λg.

Preferably, the DC feeder 6012 is composed of a first section feeder 6012a, a second section feeder 6012b and a third section feeder 6012c, wherein the first section feeder 6012a, the third section feeder 6012c are respectively connected to the two short radiation lines 6011 The ends are connected, and the second feeder 6012b is connected to the first feeder 6012a.

Preferably, the length of the first section of feeder 6012a is 0.1λg, the length of the second section of long feeder 6012b is 0.14λg, and the length of the third section of long feeder 6012c is 0.1λg to 0.4λg.

Preferably, the via hole is a via hole formed by hole metallization.

Preferably, the metal layers 301, 305 are copper foil.

Preferably, the intermediate conductive medium layers 302 and 304 are Rogers microwave boards.

Preferably, the Rogers microwave board has a thickness of 0.8 mm.

It can be seen from the above that the technical solution of the present invention includes: the antenna includes from top to bottom: an upper metal layer 301, a first middle conductive medium layer 302, a middle metal layer 303, a second middle conductive medium layer 304 and a lower metal layer layer 305; the upper metal layer 301 includes an antenna patch pattern, the middle metal layer 303 includes a feeder pattern, and the feeder pattern forms a diode feeder; the antenna patch pattern and the feeder pattern pass through a first intermediate conductive medium layer 302 via hole connection; the feeder pattern and the electrode of the lower metal layer 305 are connected through the via hole of the second intermediate conductive medium layer 304; thus, the influence of the radiation of the radiation short line on the axial ratio can be reduced, so that the practical The new type can have a good circular polarization effect.

Description of drawings

Fig. 1 is the structural representation of existing circularly polarized leaky-wave antenna;

Fig. 2 is a structural schematic diagram of an existing antenna patch pattern and a feeder pattern;

Fig. 3 is the structural schematic diagram of the circularly polarized leaky-wave antenna of the present invention;

Fig. 4 is a structural schematic diagram of the antenna patch pattern of the present invention;

Fig. 5 is the structural representation of patch unit of the present utility model;

Fig. 6 is a structural schematic diagram of the utility model feeder pattern;

Fig. 7 is a schematic structural diagram of the feeder sub-unit of the present invention.

Detailed ways

An embodiment of a circularly polarized leaky-wave antenna provided by the present invention, as shown in FIG. 3 , the antenna includes in sequence from top to bottom: an upper metal layer 301 , a first middle conductive medium layer 302 , and a middle metal layer 303 , a second intermediate conductive medium layer 304 and a lower metal layer 305 with electrodes; the metal layer is copper foil, and the intermediate conductive medium layers 302 and 304 are Rogers microwave boards with a thickness of 0.8 mm. The electrode is a square, and the side length of the square is 3 mm.

The upper metal layer 301 includes an antenna patch pattern, the middle metal layer 303 includes a feeder pattern, and the feeder pattern forms a diode feeder;

The antenna patch pattern and the feeder pattern are connected through a via hole in the first intermediate conductive medium layer 302 , and the via hole is a via hole formed by hole metallization.

The feeder pattern is connected to the electrode of the lower metal layer 305 through a via hole in the second intermediate conductive medium layer 304 , and the via hole is a via hole formed by hole metallization.

As shown in Figure 4, the antenna patch pattern 40 includes an antenna feeder 401 and several cascaded patch units 402, each patch unit 402 is connected with a varactor diode 403, and the distance between each patch unit 402 is 0.015mm. The distance between λg and 0.02λg is preferably 0.018λg, and the length of the antenna patch pattern 40 is 4.6λg, where λg refers to the waveguide wavelength. The width of the antenna feeder 401 is 0.143λg, and the width of the antenna feeder 401 depends on the sum of the thicknesses of the first intermediate conductive medium layer 302 and the second intermediate conductive medium layer 304, the thickness of the first intermediate conductive medium layer 302 and the second intermediate conductive medium layer The material of the layer 304 and the shape of the lower metal layer 305 .

As shown in FIG. 5 , the patch unit 402 includes a square 4021 with two opposite cut corners 4024 and a stub 4022, the stub 4022 is connected directly below the square 4021, and the stub 4022 has a slot 4023, the slot 4023 is used to place the varactor diode 403. There is a via hole 4025 below the slot 4023 , and the via hole 4025 corresponds to the via hole of the first intermediate conductive medium layer 302 .

The side length of the square 4021 may be 0.15λg to 0.2λg, preferably the side length is 0.1864λg, and the lengths of the cut corners 4024 are all 0.03λg.

The length of the stub 4022 is 0.06λg to 0.08λg, preferably 0.072λg in length and 0.024λg in width; the distance between the slot 4023 and the bottom edge of the square 4021 is 0.034λg, and the width of the slot is 0.01λg to 0.018λg, the preferred width is 0.014λg.

As shown in FIG. 6 , the feeder pattern 60 includes several cascaded feeder subunits 601 , wherein the feeder subunits 601 with odd serial numbers are connected together, and the feeder subunits 601 with even serial numbers are connected together.

As shown in FIG. 7 , the feeder subunit 601 includes a short radiating line 6011 and a DC feeder 6012 , wherein the short radiating line 6011 has an opening angle of 60° and a radius of 0.15λg to 0.18λg, preferably 0.15λg.

The DC feeder 6012 is composed of a first feeder 6012a, a second feeder 6012b and a third feeder 6012c, and the first feeder 6012a and the second feeder 6012b form a quarter wavelength impedance converter. The first feeder line 6012a and the third feeder line 6012c are respectively connected to both ends of the radiation short line 6011, and the second feeder line 6012b is connected to the first feeder line 6012a.

The connection between the first section feeder 6012a and the third section feeder 6012c, and the connection between the second section feeder 6012b and the first section feeder 6012a have a cut angle 6013, and the length of the cut angle 6013 is 0.009λg.

The second long feeder line 6012b has a via hole 6014 corresponding to the via hole of the second intermediate conductive medium layer 304 . The via hole 6014 is a square, and the side length of the square is 0.009λg.

The width of the DC feeder 6012 is 0.006λg; the length of the first feeder 6012a is 0.1λg, the length of the second long feeder 6012b is 0.14λg, and the length of the third long feeder 6012c is 0.1λg to 0.4λg, preferably The length is 0.23λg.

The above descriptions are only preferred embodiments of the present utility model, and are not intended to limit the protection scope of the present utility model.

Claims (9)

1. circular polarization leaky-wave antenna, it is characterized in that described antenna comprises from top to bottom successively: go up conducting medium layer (304) in the middle of conducting medium layer (302) in the middle of the metal level (301), first, the intermediate metal layer (303), second and have the lower metal layer (305) of electrode;

The described metal level (301) of going up comprises antenna patch pattern (40), and described intermediate metal layer (303) comprises feeder line pattern (60), and described feeder line pattern (60) forms the diode feeder line;

Described antenna patch pattern (40) is connected with the via hole of described feeder line pattern (60) by the first middle conducting medium layer (302);

The electrode of described feeder line pattern (60) and lower metal layer (305) is connected by the via hole of conducting medium layer (304) in the middle of second.

2. antenna according to claim 1, it is characterized in that, described feeder line pattern (60) comprises the feeder line subelement (601) of some cascades, described feeder line subelement (601) comprises interconnective radiation short-term (6011) and dc feeder (6012), the subtended angle of described radiation short-term (6011) is 60 degree, and the width of described dc feeder (6012) is 0.006 λ g.

3. antenna according to claim 2 is characterized in that, the radius of described radiation short-term (6011) is 0.15 λ g to 0.18 λ g.

4. antenna according to claim 2, it is characterized in that, described dc feeder (6012) is made of first segment feeder line (6012a), the second joint feeder line (6012b) and the 3rd joint feeder line (6012c), wherein, first segment feeder line (6012a), the 3rd joint feeder line (6012c) are connected with the two ends of radiation short-term (6011) respectively, and the second joint feeder line (6012b) is connected with first segment feeder line (6012a).

5. antenna according to claim 4, it is characterized in that, the length of described first segment feeder line (6012a) is 0.1 λ g, and the length of the described second long feeder line of joint (6012b) is 0.14 λ g, and the length of described the 3rd long feeder line of joint (6012c) is 0.1 λ g to 0.4 λ g.

6. antenna according to claim 1 is characterized in that, described via hole is the via hole that hole metallization forms.

7. antenna according to claim 1 is characterized in that, described upward metal level (301) and described lower metal layer (305) are Copper Foil.

8. antenna according to claim 1 is characterized in that, conducting medium layer (304) is Rogers's microwave board in the middle of the described first middle conducting medium layer (302) and described second.

9. antenna according to claim 8 is characterized in that, the thickness of described Rogers's microwave board is 0.8 millimeter.

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