CN217158637U

CN217158637U - Parasitic comb antenna

Info

Publication number: CN217158637U
Application number: CN202122784562.8U
Authority: CN
Inventors: 叶秀美; 黄震
Original assignee: Huizhou Desay SV Intelligent Transport Technology Research Institute Co Ltd
Current assignee: Huizhou Desay SV Intelligent Transport Technology Research Institute Co Ltd
Priority date: 2021-11-12
Filing date: 2021-11-12
Publication date: 2022-08-09
Anticipated expiration: 2031-11-12

Abstract

The utility model relates to a parasitic comb antenna, antenna array including a plurality of serial settings, the antenna array includes microstrip feeder and a plurality of irradiator, and is a plurality of the irradiator is followed microstrip feeder's length direction cross distribution in microstrip feeder's relative both sides, every the relative both sides of irradiator are equipped with the parasitic paster that has the coupling effect. The utility model discloses a set up the parasitic patch that has the coupling effect in the relative both sides of irradiator to change the antenna performance through guide and stack surface current, every irradiator is optimized control matching and radiometric by the width at irradiator both ends, thereby makes the antenna bandwidth satisfy 77-81 GHz's requirement, and its bandwidth increases to 4GHz, and in whole bandwidth, its normal direction all has maximum gain and surpasss 13 dBi.

Description

Parasitic comb antenna

Technical Field

The utility model relates to an antenna technology field, more specifically relates to a parasitic comb antenna.

Background

Because the 79GHz band medium-short range vehicle radar has the performance requirements of high resolution and wide detection angle, and the 79GHz band has the availability of the existing 4GHz broadband, the distance detection resolution of the millimeter wave radar system can be obviously improved. In the application of the automobile radar, the microstrip antenna has the advantages of low cost, small appearance and the like, and is a preferred antenna widely applied to the automobile radar sensor. The bandwidth of the antenna determines the accuracy of the vehicle radar, however, the narrow bandwidth of conventional microstrip type antennas, such as comb antennas, remains a significant challenge.

SUMMERY OF THE UTILITY MODEL

The utility model discloses an overcome microstrip type antenna among the prior art like comb antenna's narrow bandwidth problem, provide a parasitic comb antenna.

A parasitic comb antenna comprises a plurality of antenna arrays arranged in series, wherein each antenna array comprises a microstrip feeder line and a plurality of radiating bodies, the plurality of radiating bodies are distributed on two opposite sides of the microstrip feeder line in a crossed mode along the length direction of the microstrip feeder line, and parasitic patches with coupling effects are arranged on two opposite sides of each radiating body.

Further, as a preferred technical solution, a gap exists between the parasitic patch and the radiator corresponding thereto.

Further, as a preferred technical solution, a gap exists between the end of the parasitic patch close to the microstrip feeder line and the microstrip feeder line.

Furthermore, as a preferred technical solution, a gap is provided on the side of the radiator close to the parasitic patch, and the gap is located at the end where the radiator connects to the microstrip feed line.

Further, as a preferred technical solution, the amplitude of the radiator may follow a taylor distribution.

Further, as a preferred technical solution, the number of radiators is determined according to the gain and size limit required by the antenna.

Further, as a preferred technical solution, the number of the radiators is 8, 10 or 12.

Further, as a preferred technical scheme, the distance between two adjacent radiators on the same side of the microstrip feed line is half a dielectric wavelength.

Further, as a preferred technical solution, the width of the radiator gradually decreases from the middle of the microstrip feed line to both ends.

Further, as a preferred technical solution, the width and the length of the parasitic patches on both sides of the plurality of radiators are the same.

Compared with the prior art, the utility model discloses technical scheme's beneficial effect is:

the utility model discloses a set up the parasitic patch that has the coupling effect in the relative both sides of irradiator to change the antenna performance through guide and stack surface current, every irradiator is optimized control matching and radiometric by the width at irradiator both ends, thereby makes the antenna bandwidth satisfy 77-81 GHz's requirement, and its bandwidth increases to 4GHz, and in whole bandwidth, its normal direction all has maximum gain and surpasss 13 dBi.

Drawings

Fig. 1 is a schematic diagram of the antenna array structure of the present invention.

Fig. 2 is a partial enlarged view of the antenna array of the present invention.

Fig. 3 is a comparison graph of antenna array reflection coefficient | S11 |.

Fig. 4 is a comparison graph of the H-plane directional diagram of the antenna array of the present invention.

Fig. 5 is a comparison graph of the E-plane directional diagram of the antenna array of the present invention.

Fig. 6 is a graph comparing the maximum gain of the main lobe of the antenna array of the present invention.

Detailed Description

The present invention will be further described with reference to the following embodiments.

The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if there are terms such as "upper", "lower", "left", "right", "top", "bottom", "inner", "outer", etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the drawings, the description is merely for convenience and simplicity of description, and it is not intended to indicate or imply that the devices or elements being referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore, the terms describing the positional relationships in the drawings are for illustrative purposes only and are not to be construed as limiting the present patent.

Furthermore, if the terms "first," "second," and the like are used for descriptive purposes only, they are used for mainly distinguishing different devices, elements or components (the specific types and configurations may be the same or different), and they are not used for indicating or implying relative importance or quantity among the devices, elements or components, but are not to be construed as indicating or implying relative importance.

Example 1

This embodiment discloses a parasitic comb antenna, as shown in fig. 1-2: comprises a plurality of antenna arrays arranged in series, wherein the number of the antenna arrays is adjusted according to the bandwidth, the gain and the size of the antenna.

In this embodiment, the antenna array includes a microstrip feed line 1 and a plurality of radiators 2, where the plurality of radiators 2 are distributed across two opposite sides of the microstrip feed line 1 along the length direction of the microstrip feed line 1, so as to form a comb-shaped structure.

In the present embodiment, parasitic patches 3 having a coupling effect are provided on opposite sides of each radiator 2 to change the antenna performance by guiding and superimposing surface currents.

Specifically, for example, the microstrip feed line 1 is vertically disposed, and the plurality of radiators 2 are crosswise distributed on opposite sides of the microstrip feed line 1 in the length direction of the microstrip feed line 1, that is, on the left and right sides of the microstrip feed line 1, and then the parasitic patches 3 are disposed on the upper and lower sides of the radiators 2.

As a preferred embodiment, the parasitic patches 3 on both sides of the plurality of radiators 2 have the same width and length.

Further, as a preferred embodiment, a gap exists between the parasitic patch 3 and the radiator 2 corresponding to the parasitic patch 3, and a gap exists between the end of the parasitic patch 3 close to the microstrip feed line 1 and the microstrip feed line 1, that is, the parasitic patch 3 is not in direct contact connection with the microstrip feed line 1.

Therefore, it is considered that the parasitic patches 3 having the coupling effect are provided near the upper and lower sides of the radiator 2.

A gap 21 is arranged on the side of the radiator 2 close to a parasitic patch 3, and the gap 21 is positioned at the connecting end of the radiator 2 and the microstrip feeder line 1. Assuming that the width of the radiator 2 away from the end of the microstrip feed line 1 is W1, and the width of the end of the radiator 2 where the notch 21 is located is W2, then each radiator 2 is optimally controlled by W1 and W2 for matching and radiation degree.

In the present embodiment, the resonant length of the antenna array is determined by the length of the radiator 2.

In the present embodiment, the amplitude of the radiator 2 follows a taylor distribution, so that the width of the radiator 2 gradually decreases from the middle of the microstrip feed line 1 to both ends, and the lengths of the radiators 2 are the same. And the distance between two adjacent radiators 2 on the same side of the microstrip feeder 1 is half medium wavelength.

Also, in the present embodiment, the number of radiators 2 is determined according to the gain required for the antenna and the size limit.

For example, the number of radiators 2 may be 8, 10 or 12.

In the present embodiment, the number of radiators 2 is 10, so as to increase the bandwidth of the antenna from about 1.7GHz in the conventional design to 4GHz, see fig. 3, whereas the antenna array of the present embodiment is designed for a 79GHz automotive radar, which satisfies the frequency band of 77-81 GHz. While the H-plane beam width increases as shown in fig. 4, the E-plane pattern shown in fig. 5 does not change significantly, whereas it is clear from fig. 6 that the maximum gain in the normal direction exceeds 13dBi over the entire bandwidth of the antenna (77 GHz-81 GHz).

It is obvious that the above embodiments of the present invention are only examples for clearly illustrating the present invention, and are not limitations to the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. The parasitic comb antenna is characterized by comprising a plurality of antenna arrays arranged in series, wherein each antenna array comprises a microstrip feeder line (1) and a plurality of radiating bodies (2), the plurality of radiating bodies (2) are distributed on two opposite sides of the microstrip feeder line (1) in a crossed mode along the length direction of the microstrip feeder line (1), and parasitic patches (3) with coupling effects are arranged on two opposite sides of each radiating body (2).

2. A parasitic comb antenna according to claim 1, wherein there is a gap between the parasitic patch (3) and its corresponding radiator (2).

3. A parasitic comb antenna according to claim 1, wherein a gap exists between the end of the parasitic patch (3) close to the microstrip feed line (1) and the microstrip feed line (1).

4. A parasitic comb antenna according to claim 1, wherein a notch (21) is provided at a side of the radiator (2) close to one of the parasitic patches (3), the notch (21) being located at a connection end of the radiator (2) with the microstrip feed line (1).

5. A parasitic comb antenna according to claim 1, characterized in that the amplitude of said radiator (2) follows a taylor distribution.

6. A parasitic comb antenna according to claim 1, characterized in that the number of radiators (2) is determined according to the required gain and size constraints of the antenna.

7. A parasitic comb antenna according to claim 6, characterized in that the number of radiators (2) is 8, 10 or 12.

8. A parasitic comb antenna according to claim 1, characterized in that the distance between two adjacent radiators (2) on the same side of the microstrip feed line (1) is half the dielectric wavelength.

9. A parasitic comb antenna according to claim 1, wherein the width of the radiator (2) is gradually reduced from the middle of the microstrip feed line (1) to both ends.

10. A parasitic comb antenna according to claim 1, wherein the width and length of the parasitic patches (3) on both sides of the plurality of radiators (2) are the same.