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Method for expanding lower limit of working frequency band of coplanar Vivaldi antenna

A technology of working frequency band and antenna is applied in the field of expanding the lower limit of the working frequency band of a coplanar Vivaldi antenna, which can solve the problems of limited antenna size of the Vivaldi antenna, and achieve the effect of expanding the lower limit of the working frequency band, facilitating impedance matching, and improving the current distribution.

Pending Publication Date: 2022-01-04
中国人民解放军63660部队
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Problems solved by technology

[0005] The purpose of the present invention is to provide a method for expanding the lower limit of the operating frequency band of the coplanar Vivaldi antenna to solve the technical problem that the lower limit of the operating frequency band of the Vivaldi antenna is limited by the size of the antenna

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  • Method for expanding lower limit of working frequency band of coplanar Vivaldi antenna
  • Method for expanding lower limit of working frequency band of coplanar Vivaldi antenna
  • Method for expanding lower limit of working frequency band of coplanar Vivaldi antenna

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Embodiment 1

[0042] Such as Figure 6 Shown is an application example of a method for expanding the lower limit of the operating frequency band of a coplanar Vivaldi antenna provided by the present invention. In this embodiment, a microstrip line-metal via is used for feeding. Since the present invention only modifies the internal structure of the coplanar Vivaldi antenna radiation patch, the feeding structure will not be described in detail below.

[0043] Such as Figure 6 As shown, closed slots 11 and 21 are opened on the metal radiation patches on the upper and lower sides of the coplanar Vivaldi antenna to construct two loop radiation structures, the upper and the lower. The upper loop radiation structure is composed of a curved radiation arm 12, a linear radiation arm 13 parallel to the antenna radiation direction and close to the upper edge of the dielectric substrate 3, and a linear radiation arm 14 parallel to the antenna radiation direction and located above the resonant cavity ...

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Abstract

The invention belongs to the technical field of electromagnetic fields and microwaves, and particularly relates to a method for expanding the lower limit of a working frequency band of a coplanar Vivaldi antenna. A closed groove similar to a radiation patch in shape is formed in a traditional coplanar Vivaldi antenna metal radiation patch, a curve radiation arm is constructed, two metal radiation patches with gradually changing indexes are equivalently constructed, and current distribution is improved; the first curve radiation arm 12, the first linear radiation arm 13 and the second linear radiation arm 14 form an upper side loop radiation structure, and the second curve radiation arm 22, the third linear radiation arm 23 and the fourth linear radiation arm 24 form a lower side loop radiation structure, so that the effective length of a current propagation path on the surface of the antenna is effectively prolonged, and the low-frequency radiation capability of the antenna is enhanced; and meanwhile, parallel slot lines are arranged on the first linear radiation arm 13 and the third linear radiation arm 23, and resistance loading is carried out, so that impedance matching is facilitated, antenna reflection is reduced, part of low-frequency components are absorbed to the greatest extent, and then the lower limit of the working frequency band of the antenna is further remarkably expanded.

Description

technical field [0001] The invention belongs to the technical field of electromagnetic fields and microwaves, and in particular relates to a method for expanding the lower limit of the operating frequency band of a coplanar Vivaldi antenna. Background technique [0002] The Vivaldi antenna is a planar end-fired gradient slot antenna. Due to its advantages such as wide operating frequency bandwidth, good directivity, high gain, and simple structure and easy processing and integration, it is widely used in ultra-wideband fields, such as radar detection, ultra-wideband communication, etc. . Vivaldi antennas can be roughly divided into two categories, one is coplanar Vivaldi antenna fed by microstrip-slot line coupling, and the other is antipodal Vivaldi antenna fed by microstrip-parallel dual-wire feed. The upper limit of the operating frequency band of the coplanar Vivaldi antenna is limited by its feeding structure, and thus the antipodal Vivaldi antenna has evolved. Howeve...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01Q9/04H01Q1/00H01Q5/25H01Q5/50
CPCH01Q9/0407H01Q1/002H01Q5/25H01Q5/50
Inventor 王彬文宁辉燕有杰胡学溢刘启龙朱美琪王殿喜
Owner 中国人民解放军63660部队
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