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Superhigh frequency/very high frequency high-gain, broadband directive antenna

A directional antenna and VHF technology, applied in antennas, antenna arrays, non-resonant long antennas, etc., can solve the problems of low gain, large lateral size of the antenna, large antenna size, etc., and achieve high gain and wide application value. Effect

Inactive Publication Date: 2011-06-01
XIDIAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the deficiencies of the above-mentioned prior art, and provide a UHF / VHF high-gain, wide-band directional antenna to solve the problems of narrow frequency band, low gain and large antenna size in the existing vibrator-type logarithmic periodic antenna. question
[0006] It first designs a single vibrator type logarithmic period antenna according to the conventional method. In order to solve the problem of large lateral size of the antenna, the linear vibrator is changed into a T-shaped structure, and then the same two pairs of T-shaped vibrator type logarithmic period Antennas are arranged in a cone-shaped 2-element array structure, which constitutes the UHF / VHF high-gain, broadband directional antenna of the present invention

Method used

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  • Superhigh frequency/very high frequency high-gain, broadband directive antenna
  • Superhigh frequency/very high frequency high-gain, broadband directive antenna
  • Superhigh frequency/very high frequency high-gain, broadband directive antenna

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Embodiment Construction

[0028] Table 1

[0029] Frequency (MHz)

[0030] The electrical performance of the present invention can be reflected by the direction diagram of the E face and the H face of the following test curve and actual measurement:

[0031] figure 2 is the voltage standing wave ratio test curve in the frequency band of the present invention. The voltage standing wave ratio test results show that the voltage standing wave ratio of the antenna is less than 1.9 in the 225-400MHz frequency band;

[0032] Figure 3a and Figure 3b respectively show the measured E-plane and H-plane patterns of the antenna at the frequency point of 225MHz;

[0033] Figure 4a and Figure 4b respectively show the measured E-plane and H-plane patterns of the antenna at the frequency point of 325MHz;

[0034] Figure 5a and Figure 5b show the measured E-plane and H-plane patterns of the antenna at the 400MHz frequency point respectively.

[0035] From the test results of the radiation pattern of the E...

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Abstract

This invention discloses a UHF / VHF high gain and wide band directional antenna applying two same T shaped vibrator log-periodic antennas made of T shaped vibrators arrayed in two-element array structure of a cone and mounted on a metal earth plate connected by two metallic connecting strips at the top and feeding signals with a hard coaxial cable, in which, every antenna is composed of seven T shaped vibrators, a medium fixing plate, two metallic supporting frames and two medium supporting blocks.

Description

technical field [0001] The invention relates to the technical field of antennas, in particular to a UHF / VHF high-gain, broadband directional antenna for communication, navigation, meteorological detection, nuclear explosion detection and other fields. Background technique [0002] As a type of frequency-independent antenna, the log-periodic antenna was proposed by D.H.DuHamel and D.E.Isbell in 1957. See D.H.DuHamel and D.E.Isbell, "Broadband Logarithmically Periodic Antenna Structures," IRE National ConventionRecord, pt.1, pp.119~128, 1957. The most typical vibrator-type logarithmic periodic antenna was published in the technical paper "Log Periodic Dipole Arrays," IRE Trans Antennas Propagation, Vol.AP-8, pp.260-267, May 1960, with D.E.Isbell as the author. For the analysis and design of the periodic antenna, please refer to R.L.Carrel's doctoral dissertation "Analysis and Design of the Log-Periodic Dipole Antenna," Ph.D.Dissertation, Elec.Eng.Dept., University of Illinois...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01Q11/10H01Q21/00
Inventor 张福顺焦永昌
Owner XIDIAN UNIV