Open AccessIntegration of three‐dimensional high‐ Q filters with aperture antennas and bandwidth enhancement utilising surface waves
Author(s) -
Yusuf Yazid,
Gong Xun
Publication year - 2013
Publication title -
iet microwaves, antennas and propagation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.555
H-Index - 69
eISSN - 1751-8733
pISSN - 1751-8725
DOI - 10.1049/iet-map.2012.0432
Subject(s) - optics , bandwidth (computing) , antenna efficiency , antenna factor , acoustics , antenna aperture , ground plane , physics , antenna (radio) , radiation pattern , engineering , electrical engineering , telecommunications
Seamless integration of three‐dimensional cavity filters with a new antenna is presented. The antenna consists of an open‐ended waveguide aperture mounted on a ground plane. The energy coupling between the last cavity resonator and free space, which is related to the external quality ( Q ) factor of the integrated filter/antenna system, can be significantly enhanced. The low external Q factor ( Q ext ), which is necessary for the design of wide‐band filter/antenna systems, is due to the excitation and radiation of surface waves. A three‐pole cavity filter integrated with the proposed antenna is demonstrated at X band. The centre frequency and fractional bandwidth of the filter/antenna system are 10.2 GHz and 34.0%, respectively, in simulations. A prototype filter/antenna system is fabricated and measured. Good agreement between the simulated and measured results is observed.