Synthesis and Design of a New Printed Filtering Antenna

Chao-Tang Chuang, Shyh-Jong Chung

Research output: Contribution to journalArticlepeer-review

162 Scopus citations


Synthesis and design of a new printed filtering antenna is presented in this communication. For the requirements of efficient integration and simple fabrication, the co-design approach for the integration of filter and antenna is introduced. The printed inverted-L antenna and the parallel coupled microstrip line sections are used for example to illustrate the synthesis of a bandpass filtering antenna. The equivalent circuit model for the inverted-L antenna, which is mainly a series RLC circuit, is first established. The values of the corresponding circuit components are then extracted by comparing with the full-wave simulation results. The inverted-L antenna here performs not only a radiator but also the last resonator of the bandpass filter. A design procedure is given, which clearly indicates the steps from the filter specifications to the implementation. As an example, a 2.45 GHz third-order Chebyshev bandpass filter with 0.1 dB equal-ripple response is tackled. Without suffering more circuit area, the proposed structure provides good design accuracy and filter skirt selectivity as compared to the filter simple cascade with antenna and a bandpass filter of the same order. The measured results, including the return loss, total radiated power, and radiation gain versus frequency, agree well with the designed ones.
Original languageEnglish
Article number5680594
Pages (from-to)1036-1042
Number of pages7
JournalIEEE Transactions on Antennas and Propagation
Issue number3
StatePublished - Mar 2011


  • Chebyshev bandpass filter
  • filtering antenna
  • filter synthesis
  • inverted L-antenna
  • skirt selectivity

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