基于加载线型Ka频段的五位数字移相器

Design of 5-bit digital phase shifter in Ka-band using tandem stub

摘要:

数字移相器广泛应用于相控阵雷达中，本文采用一前一后加载支线的方法设计了 11.25°,22.5°和45°移相单元，以3 dB支线耦合器的形式设计90°和180°移相单元，在Ka频段研制出五位数字移相器。该移相器在30 GHz~31 GHz工作频带内，各移相单元实测相移误差最大为6.5°，最小为0.2°；插入损耗最大为11.8 dB，最小为8.6 dB；输入驻波比小于2，整个电路尺寸为110 mm×55 mm×25 mm。

Abstract:

The digital phase shifter is widely used in phased-array radar. The phase shifter was fabricated using tandem stub for 11.25°,22.5°and 45°, and using 3 dB branch-line coupler type for 90°and 180°. A 5-bit digital phase shifter circuit in Ka-band was presented. The measurement results indicated that the maximum of the phase error was 6.5°，the minimum of the phase error was 0.2°, the maximum of insertion loss was 11.8 dB, the minimum of insertion loss was 8.6 dB, and the VSWR was better than 2 in the frequency band of 30 GHz-31 GHz. The whole volume of the phase shifter was 110 mm× 55 mm×25 mm.