Small horizontal polarization ultra-high frequency slit antenna

A technology of horizontal polarization and slot antenna, which is applied in the direction of slot antenna, radiation element structure, circuit, etc., and can solve problems such as difficult to use

Inactive Publication Date: 2005-05-25
SHANGHAI JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Even if its horizontally polarized radiation characteristics are recognized and the requirements for other electrical performance parameters are relaxed, structures larger than twice the wavelength are difficult to use in actual vehicle systems in the UHF band

Method used

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  • Small horizontal polarization ultra-high frequency slit antenna
  • Small horizontal polarization ultra-high frequency slit antenna
  • Small horizontal polarization ultra-high frequency slit antenna

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Embodiment 1: Double folded slot antenna

[0024] Actually processed a pair of double folded slot antenna, and experimentally measured the main electrical performance parameter S of the antenna 11 , VSWR, gain and pattern. The antenna design is tuned at 800MHz. S 11 The actual measurement results of VSWR and VSWR show that there are actually two resonance points, which are 800MHz and 815MHz respectively, and the bandwidth of VSWR less than 1.6 reaches 58MHz (766-824MHz). The experimental measurement results of the pattern of the E-plane (θ=90°, in the horizontal plane) of the antenna in this example show that the fluctuation of the pattern is less than 2dB within the range of 120°, and the fluctuation of the pattern is less than 5dB within the range of 270°. The maximum notch depth is 12dB. There are two sunken points, and the locations where they occur are basically symmetrical. The measured antenna gain is greater than 2dB i .

Embodiment 2

[0025] Embodiment 2: Double Gate Slot Antenna

[0026] A pair of gate-shaped slot antennas were actually processed, and the main electrical performance parameters S of the antenna were measured experimentally. 11 , VSWR, gain and pattern. The antenna design is tuned at 722MHz (39 channels). S 11 The actual measurement results of VSWR and VSWR show that there are actually two resonance points, which are 722MHz and 748MHz respectively, and the bandwidth of VSWR less than 1.6 reaches 48MHz (706.5-754.5MHz). The experimental measurement results of the pattern of the E-plane (θ=90°, in the horizontal plane) of the antenna in this example show that the pattern fluctuation is less than 1dB within the range of 120° and less than 5dB within the range of 260°. The maximum notch depth is 14dB. There are two sunken points, and the locations where they occur are basically symmetrical. The measured antenna gain is greater than 3dB i .

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Abstract

A small horizontally polarized ultra-high frequency slot antenna belongs to the field of wireless communication. The present invention adopts a quarter-wavelength slot antenna fed by an end point, and the slot is opened on the metal hollow tube, and a crease is added, and a gap for balanced feeding at the opening of the lower end is added, and another same slot is opened at a symmetrical position of the metal hollow tube. A half-wavelength transmission line is used between the two to connect the feed, the slots and slots are inverted L-shaped and open at the lower end, and the slots and slot openings are balanced for feeding. The invention realizes the gain greater than that of the ordinary vibrator antenna of the same size; realizes horizontal polarization reception, overcomes the shortcomings of the traditional Erfurt slot antenna's geometric parameters and electrical characteristics that are sensitive to frequency changes, and is more convenient for design and debugging; In terms of directivity, it is worse than the ideal Erfurt slot antenna, but it is more stable than the latter, and except for two concave areas, other areas fluctuate very little. This pattern will be sufficient to meet the reception requirements of urban mobile digital TV.

Description

technical field [0001] The invention relates to a horizontally polarized receiving antenna, in particular to a small horizontally polarized ultra-high frequency slot antenna, which belongs to the field of wireless communication. Background technique [0002] At present, wireless communication represented by mobile communication is developing rapidly. With the improvement of communication capacity, quality, content and other requirements and the development of integrated circuit technology, people pay more and more attention to multimedia digital communication methods. At the same time, mobile reception has become one of the main communication methods because it can greatly meet the needs of users. Therefore, higher and higher requirements are placed on the receiving antenna. For example, digital TV has been launched in Shanghai recently, and buses and various cars will be one of the main users. Most of my country's TV transmission adopts horizontal polarization, so researc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01Q1/36H01Q13/10
Inventor 金荣洪
Owner SHANGHAI JIAOTONG UNIV
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