Design of a cavity-based filtering antenna with dual-polarization operating at Ka -band

Abstract

The contribution of this work is to propose a cavity‐based antenna with both dual‐polarization and bandpass filter characteristics. Proper cavity resonators and antenna based on the substrate integrated waveguide (SIW) technology are designed utilizing the low temperature co‐fired ceramics (LTCC) for demonstration. By properly arranging and coupling the cavities, a shaping of filter‐like response for the antenna gain and input return loss can be obtained. Measures for achieving a good isolation and a low cross‐polarization level have also been taken into account during the design procedure. A 4th‐order prototype working in the Ka‐band is designed and fabricated. Investigations show that the antenna presents a good isolation below ‐29 dB across the operating bandwidth, together with a cross‐polarization level lower than ‐25 dB at the center working frequency. The performance of the prototype has been verified in the measurement.

Design of dual‐mode dual‐band rectangular waveguide filtering antenna

“…System performance will be deteriorated due to introduced mutual couplings between bands when these frequency bands are close to each other. Hence, combination of antennas and filters into one device is extensively researched in recent years . Furthermore, large roll‐off level is required for filtering antenna design.…”