宽频带耦合带状线魔T的设计方法  

Design Method of a Wideband Magic-T with Coupled-strips

作　　者：田唯人 张建利 李娟妮 

机构地区：[1]西北电子设备研究所,陕西西安710065

出　　处：《无线电工程》2007年第9期41-43,共3页Radio Engineering

摘　　要：给出一种宽频带耦合带状线90°移相器的工程设计方法。通过适当选取耦合带状线奇偶模阻抗比ρ、介质基片的相对介电常数εr与厚度s,以及带状线地板间距b,频带宽度可达1∶2.34倍频程可以实现所需带宽内90°移相,与宽频带3dB电桥组合可实现宽频带魔T,同时推导给出了3dB电桥耦合度κ、εr、s/b的设计关系公式。通过仿真给出了修正量。A design method of a wideband 90° phase-shifter with coupled strip-lines is presented. A wideband Magic-T can be designed ingeniously by combining a 90° phase-shifter and a 3 dB bridge. The bandwidth is about 1：2.34 when phase-shift is in 90°± 5° by changing the even-mode and odd-mode impedance ratio ρ, the dielectric constant εr, the thickness s and the ground plate distance b. The relationship of coupled coefficient k, εr, s, b with 3 dB bridge is derived. The designed parameters have been calibrated by simulation.

关 键 词：90°移相器 耦合带状线 电桥 魔T 

分 类 号：TN713[电子电信—电路与系统]