Filtering Antenna with High Selectivity Using Multiple Coupling Paths from Source/Load to Resonators

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Original languageEnglish
Pages (from-to)4320-4325
Journal / PublicationIEEE Transactions on Antennas and Propagation
Issue number8
Online published23 May 2018
Publication statusPublished - Aug 2018


This paper presents a filtering antenna with high selectivity using multiple coupling path from source/load to resonators. The high selectivity of the filtering antenna’s boresight gain response is achieved by a novel coupling scheme, which induces additional coupling between source/load and non-adjacent resonators to construct cross-coupling paths. Thanks to the extra cross-coupling paths, the filtering antenna can generate maximum of N radiation nulls with N resonators. Besides, resonator using a combination of open-ended stub and short-ended stub is adopted to construct this novel coupling scheme more easily. For demonstration, a three-order filtering stacked patch antenna with a center frequency of 2.3 GHz and fractional bandwidth of 15.2% is fabricated. Two independently controllable radiation nulls are located at 1.97GHz and 2.61 GHz. Unidirectional radiation patterns have been achieved with cross-polarization lower than -20 dB and back lobes lower than -18 dB.

Research Area(s)

  • Antennas, Band-pass filters, Couplings, Filtering antenna, multiple coupling paths, patch antenna, quasi-elliptic boresight gain response, radiation nulls, Resonant frequency, Resonator filters, Resonators