A Filtering Microstrip Antenna Array

Chin-Kai Lin, Shyh-Jong Chung

Research output: Contribution to journalArticlepeer-review

109 Scopus citations


A new filtering microstrip antenna array is presented. The antenna elements, together with the very compact feeding network, function as a third-order bandpass filter. The feeding network, which consists of one power divider and two baluns, provides the first two stages, and the microstrip antenna elements provide the last stage in the filter design. The equivalent lumped circuit model is analyzed, and the detail synthesis procedure is presented. A third-order filtering 2 x 2 microstrip antenna array is designed at a center frequency of 5 GHz with 3% fractional bandwidth and Chebyshev 0.3-dB equal-ripple broadside antenna gain response. The results from circuit model, full-wave simulation, and measurements agree well. Compared to the conventional patch antenna array, the proposed filtering microstrip antenna array successfully suppresses the unwanted signals in out-of-band, preserves good selectivity at band edges, and retains the flatness of the pass-band broadside antenna gain response.
Original languageEnglish
Article number5975229
Pages (from-to)2856-2863
Number of pages8
JournalIEEE Transactions on Microwave Theory and Techniques
Issue number11
StatePublished - Nov 2011

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