Design of compact L-band 180° phase shifters

M. E. Blalkowski, N. C. Karmakar

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10 Citations (Scopus)


The practical design of L-band 180° phase shifters faces two problems. One is associated with the size, and the other with the cost. This paper presents the design of two varieties of 180° phase shifters that minimize the size and manufacturing cost. The first variety is a hybrid-coupled phase shifter whose size is reduced by employing a compact 3 dB branch-line coupler. The second variety is a switched-branch-line phase shifter, which uses only two diodes to perform its function. Both phase shifters employ low-cost UHF diodes in their switching networks. An LC compensation technique is applied to make the diodes good-quality on-off switches in the L-band. Using these compensation methods, low-cost, good-quality compact 180° phase shifters are developed.

Original languageEnglish
Pages (from-to)144-148
Number of pages5
JournalMicrowave and Optical Technology Letters
Issue number2
Publication statusPublished - 20 Jul 1999
Externally publishedYes

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