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Frequency scanning antenna array capable of realizing wide-angle scanning in limited bandwidth

A frequency scanning antenna, limited bandwidth technology, applied in the field of frequency scanning antenna array, can solve the problems of increased loss, complex structure, huge energy, etc., to achieve the effects of light weight, convenient implementation and simple structure

Inactive Publication Date: 2010-11-17
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The narrower the bandwidth, the longer the slow wave line used to achieve wide-angle scanning, and the corresponding loss will increase
However, due to the existence of dielectric loss, metal loss and radiation loss in the traditional microstrip slow wave line, the energy consumed on the microstrip slow wave line is huge.
However, if the microstrip slow wave line is not used, it has the disadvantages of complex structure and large volume, such as waveguide slow wave line

Method used

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  • Frequency scanning antenna array capable of realizing wide-angle scanning in limited bandwidth
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  • Frequency scanning antenna array capable of realizing wide-angle scanning in limited bandwidth

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The frequency range used was 8.5-10.5 GHz, the scanning angle was ±45°, the dielectric constant of the used dielectric plate was 2.2, the thickness was 1 mm, and the loss angle was 0.0009.

[0023] The antenna array structure is composed of 128 microstrip antenna units, and the array is 32×2. Every 8 × 2 cells form a sub-array, and there are four sub-arrays in total. The row spacing and column spacing of adjacent microstrip antenna units in the array are both equal to 0.52 spatial wavelengths. According to the bandwidth and scanning angle, the length of the slow wave line of each microstrip unit phase cabinet is four wavelengths. According to the measured results, the loss per wavelength of the microstrip line on this medium is 0.12dB. If it is such a loss value, the loss value of the 32-element array on the slow wave line is 14.88dB, which is very surprising and unacceptable in practical design. At the same frequency, the measured loss of the coaxial line is 0.02dB ...

Embodiment 2

[0026] The frequency range used was 8.5-10.5 GHz, the scanning angle was ±45°, the dielectric constant of the used dielectric plate was 2.2, the thickness was 1 mm, and the loss angle was 0.0009.

[0027] The antenna array structure described is composed of 256 microstrip antenna elements, and the array is arranged in a 64×2 arrangement. Every 8 × 2 cells form a sub-array, with a total of 8 arrays. The row spacing and column spacing of adjacent microstrip antenna units in the array are both equal to 0.52 spatial wavelengths. According to the bandwidth and scanning angle, the length of the slow wave line of each microstrip unit phase cabinet is four wavelengths. According to the measured results, the loss per wavelength of the microstrip line on this medium is 0.12dB. If it is such a loss value, the loss value of the 64-element array on the slow wave line is 30.24dB, which is very surprising and unacceptable in practical design. At the same frequency, the measured loss of th...

Embodiment 3

[0029] The frequency range used was 8.5-10.5 GHz, the scanning angle was ±45°, the dielectric constant of the used dielectric plate was 2.2, the thickness was 1 mm, and the loss angle was 0.0009.

[0030] The antenna array structure described is composed of 512 microstrip antenna elements, and the array is 128×2. Every 8 × 2 cells form a sub-array, with a total of 16 arrays. The row spacing and column spacing of adjacent microstrip antenna units in the array are both equal to 0.52 spatial wavelengths. According to the bandwidth and scanning angle, the length of the slow wave line of each microstrip unit phase cabinet is four wavelengths. According to the measured results, the loss per wavelength of the microstrip line on this medium is 0.12dB. If it is such a loss value, the loss value of the 128-element array on the slow wave line is 60.96dB, which is very surprising and unacceptable in practical design. At the same frequency, the measured loss of the coaxial line is 0.02d...

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Abstract

The invention discloses a frequency scanning antenna array capable of realizing wide-angle scanning in a limited bandwidth, which comprises microstrip patch units [1], absorbing loads [2] and slow wave structures [3]. The frequency scanning antenna array is divided into a plurality of sub-arrays [6], wherein the sub-array is provided with a feed coaxial line [4]; one end of the coaxial line is connected with the slow wave structures [3], while the other end is connected with a power divider [5]; the slow wave structure comprises a three-path power divider [8] and a coupling linear power divider [9] which are in mixed-use; and the microstrip path unit [1] is a caliber-coupled microstrip antenna unit. The frequency scanning antenna array adopts microstrip antennae so as to realize the advantages of simple structure and light weight, adopts the slow wave structures mixing the coaxial lines and microstrip lines so as to reduce loss by over 30 percent than that of the conventional frequency scanning microstrip antenna at the same time of realizing the wide-angle scanning in the limited bandwidth, and adopts the three-path power divider and the coupling linear power divider which are in mixed-use so as to realize the advantage of the amplitude distribution of the antenna array.

Description

technical field [0001] The present invention relates to a scanning antenna array, in particular to a wide-angle scanning frequency scanning antenna array within a limited bandwidth. Background technique [0002] Electronically scanned antennas overcome the shortcomings of slow scanning speed in traditional mechanical scanning, and have been widely used in radar, communication and other fields. The frequency scanning antenna, as a kind of electronic scanning antenna, has attracted attention because of its simple structure, high reliability and low implementation cost. Among the frequency scanning arrays that have been used, the rectangular waveguide narrow-side slit traveling wave array antenna is used more often. However, their large size and heavy weight limit their application range. Since the late 1970s, some people have successively proposed frequency scanning microstrip antenna arrays with beam scanning capability, which are mainly divided into two categories, one is ...

Claims

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Application Information

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IPC IPC(8): H01Q3/34H01Q21/00H01Q13/08
Inventor 方大纲王昊刘永康
Owner NANJING UNIV OF SCI & TECH
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