X-band waveguide filtering antenna array with nonuniform feed structure

Research output: Contribution to journalArticlepeer-review


Colleges, School and Institutes

External organisations

  • South China University of Technology
  • School of Electronics


This paper proposes a novel design approach for a filtering antenna, which contains an array of 4 by 2 waveguide aperture radiation elements. Coupling matrix theory is introduced in this paper to synthesize the multiple coupled-resonators circuit. Unequal amplitude excitation is applied to the 4×2 elements so as to obtain a low sidelobe level. To demonstrate the concept, an X-band antenna array is designed and fabricated using a three-layer waveguide structure.Measured results show that the filtering antenna array can achieve a gain of more than 15.58 dBi and a radiation efficiency of higher than 90% over the passband (9.91-10.1 GHz). The sidelobe level is-18.3 dB in the H-plane and-21.1 dB in the E-plane.


Original languageEnglish
Article number7936600
Pages (from-to)4843-4850
Number of pages8
JournalIEEE Transactions on Microwave Theory and Techniques
Issue number12
Early online date31 May 2017
Publication statusPublished - 1 Dec 2017


  • Coupling matrix, Filtering antenna, High efficiency, Low sidelobe, Unequal amplitude excitation