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Stepped ultra-wideband helical antenna

A helical antenna and ultra-wideband technology, which is applied in the direction of antennas, resonant antennas, and mid-position feeds between antenna endpoints, can solve the problems of poor radiation effects and difficulty in taking into account the axial ratio of helical antennas, and achieve clear paths and easy access. Antenna reference design, practical effects

Pending Publication Date: 2021-06-11
杭州永谐科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In order not to lose the helical radiation electromagnetic wave, the ultra-wideband helical antenna usually sets a metal platform in the cavity, because only the frequency of four times the corresponding wavelength of the cavity depth can satisfy the forward radiation electromagnetic wave and the backward radiation electromagnetic wave reflected by the metal platform Superposition in the same direction makes it difficult to take into account the axial ratio index of the standing wave pattern within the bandwidth of the helical antenna, and the backward radiation electromagnetic waves in other frequency bands may even cancel the forward radiation electromagnetic waves after being reflected by the metal platform, resulting in a change in the overall radiation effect. In the worst case, if the back cavity is filled with a wave-absorbing material, the filled wave-absorbing material will absorb the backward radiation electromagnetic wave and will not reflect the backward radiation electromagnetic wave to generate gain. According to this situation, it is necessary to design a stepped ultra-wideband spiral antenna

Method used

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Effect test

Embodiment 1

[0048] Such as figure 1 As shown, a stepped ultra-wideband helical antenna of the present invention includes a cavity-back base 1, a cavity-back side plate 2, a PCB board 3 and a feeding balun board 4, a cavity-back base 1, a cavity-back side plate 2 For metal materials, such as Figure 5 As shown, the PCB board 3 is provided with a double helix 7, and the double helix 7 is divided into a spiral inner circle and a spiral outer circle, such as figure 2 As shown, the back chamber base 1, the back chamber side board 2 and the PCB board 3 are combined to form a closed chamber, and the two sides of the feeding balun board 4 are provided with microstrip lines, and one end of the feeding balun board 4 is located at On the back chamber base 1, the microstrip line is connected to the double helix 7 on the PCB board 3 to form a current path. The double helix 7 is a balanced double line symmetrical structure, and its feed should also adopt a balanced feed method. The microstrip bar Lu...

Embodiment 2

[0067] The stepped metal platform 5 is divided into four parts with stepped depths, the total depth of the chamber is 50-90mm, and the total number of steps of the stepped metal platform 5 is 40-80. When the chamber depth is 50-90mm, the level of the stepped depth The number of four parts is the most suitable, which can ensure that the double helix has sufficient bandwidth while ensuring the stability of the operating frequency. From top to bottom, it is the first part of the step depth, the second part of the step depth, the third part of the step depth and the fourth part. Step depth, the number of steps in the first part of the step depth accounts for 1 / 2 or 1 / 2 of the total number of adjacent integers, the number of steps in the second part of the step depth accounts for 1 / 4 of the total or an adjacent integer of 1 / 4, the third part of the steps The number of steps in the depth accounts for 1 / 6 of the total or an integer adjacent to 1 / 6, the number of steps in the fourth pa...

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Abstract

A stepped ultra-wideband helical antenna comprises a back cavity base, a back cavity side plate, a PCB and a feed balun plate, double helical lines are arranged on the PCB, and the back cavity base, the back cavity side plate and the PCB are combined to form a closed cavity. Microstrip lines are arranged on the two side faces of the feed balun plate, one end of the feed balun plate is located on the back cavity base, and the microstrip line at the other end of the feed balun plate is connected with the double-helix line on the PCB. The stepped ultra-wideband helical antenna also comprises a stepped metal table arranged in the cavity, the stepped metal table is an inverted-T-shaped table, and due to the arrangement of the stepped metal table, the antenna has wider bandwidth. According to the helical antenna, the stepped metal table is arranged, and the first surface is parallel to the PCB and the back cavity base, so that the reflected spiral backward radiation electromagnetic waves and the spiral forward radiation electromagnetic waves are in the same direction, and the effect of improving gain is further realized. Relative to a flat-bottom back cavity planar helical antenna and a trapezoidal inclined plane column platform back cavity planar helical antenna, the double helix line has wider bandwidth, higher practicability and higher efficiency.

Description

technical field [0001] The invention relates to the technical field of signal transmission devices, in particular to a stepped ultra-wideband helical antenna. Background technique [0002] In order not to lose the helical radiation electromagnetic wave, the ultra-wideband helical antenna usually sets a metal platform in the cavity, because only the frequency of four times the corresponding wavelength of the cavity depth can satisfy the forward radiation electromagnetic wave and the backward radiation electromagnetic wave reflected by the metal platform Superposition in the same direction makes it difficult to take into account the axial ratio index of the standing wave pattern in the bandwidth of the helical antenna, and the backward radiation electromagnetic waves in other frequency bands may even cancel the forward radiation electromagnetic waves after being reflected by the metal platform, resulting in a change in the overall radiation effect. In the worst case, if the ba...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01Q9/27H01Q15/14H01Q1/38H01Q1/36
CPCH01Q9/27H01Q15/14H01Q1/38H01Q1/36
Inventor 马长春唐剑明
Owner 杭州永谐科技有限公司
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