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Filter-Antenna Module Using Substrate Integrated Waveguide Cavities

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6 Author(s)
Nova, O.A. ; Dept. of Electr. & Electron. Eng., Los Andes Univ., Bogota, Colombia ; Bohorquez, J.C. ; Pena, N.M. ; Bridges, G.E.
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A design procedure for filter-antenna modules based on substrate integrated waveguide cavities is presented in this letter. The filter-antenna module is modeled as an asynchronously tuned coupled-resonator circuit in which the last resonator also contains the radiating element. The design of the filter-antenna module is based on the classical process applied to obtain filters through the use of coupled resonators. The designed filter-antenna module is manufactured and measured, obtaining the following: a central frequency (fo) of 1.94 GHz, a -3-dB fractional band- width (FBW) of 5.57%, a gain (G) of 4.87 dBi, a front-to-back ratio (FTBR) of 25.60 dB, and a co-to-cross-polarization ratio of 22.86 dB in the direction of maximum radiation. The integration of the filter and the antenna into just one module leads to a reduction of size and weight in the RF front-end, while the implementation by means of the substrate integrated waveguide technique makes the integration with planar circuits easier.

Published in:

Antennas and Wireless Propagation Letters, IEEE  (Volume:10 )