Compact monopulse sum-difference comparator based on double-layer substrateintegrated waveguide

作者：Liu, Yi^*; Yang, Hu; He, Yan; Zhu, Jiang

来源：Electronics Letters, 2017, 53(22): 1477-1478.

DOI：10.1049/el.2017.2064

• comparators (circuits)
• substrate integrated waveguides
• directional couplers
• microwave phase shifters
• compact monopulse sum-difference comparator
• double-layer substrate integrated waveguide
• X-band
• directional coupler
• double-stepped coupling slot
• common broad side
• folded parallel SIW
• phase shifter
• magic tee interconnection
• comparator network
• miniaturised compact monopulse antenna systems
• frequency 9
• 5 GHz to 10
• 5 GHz

A monopulse sum-difference comparator based on double-layer substrate integrated waveguide (SIW) for X-band applications is investigated and experimentally validated. A 90 degrees 3-dB directional coupler with a double-stepped coupling slot in the common broad side between a pair of folded parallel SIWs and an equal-length unequal-width 90 degrees phase shifter are adopted to form a magic tee. The four magic tees are elegantly interconnected to design a highly compact comparator. Experimental results show the bandwidth (reflection coefficient < -10 dB) of the comparator can achieve 10% with an operating frequency range of 9.5-10.5 GHz, in which the output amplitude and phase imbalance are within 0.75 dB and 14 degrees (RMS), respectively. The insertion losses are about 1.5-2.5 dB and the isolations between the three channels are all better than 20 dB. In particular, the double-layer configuration of the comparator network reduces the occupied area with the potential for high integration and makes it to be a good candidate for miniaturised and compact monopulse antenna systems.

• 出版日期2017-10-26
• 单位中国人民解放军国防科学技术大学