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

Content Provider	IET Digital Library
Author	Liu, Yi Yang, Hu He, Yan Zhu, Jiang
Abstract	A monopulse sum-difference comparator based on double-layer substrate integrated waveguide (SIW) for X-band applications is investigated and experimentally validated. A 90° 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° 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° (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.
Starting Page	1477
Ending Page	1479
Page Count	3
ISSN	00135194
Volume Number	53
e-ISSN	1350911X
Issue Number	Issue 22, Oct (2017)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/el/53/22
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/el.2017.2647
Journal	Electronics Letters
Publisher Date	2017-09-22
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Analogue Circuit Common Broad Side Compact Monopulse Sum-difference Comparator Comparator Network Comparators (circuits) Digital Circuit Directional Coupler Directional Couplers Double-layer Substrate Integrated Waveguide Double-stepped Coupling Slot Folded Parallel SIW Frequency 9.5 GHz to 10.5 GHz Magic Tee Interconnection Microwave IC Microwave Phase Shifters Miniaturised Compact Monopulse Antenna System Phase Shifter Substrate Integrated Waveguide Waveguide And Microwave Transmission Line Waveguide And Microwave Transmission Line Component X-Band
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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