A vertical integration of high-Q filters with patch antennas with enhanced bandwidth and high efficiency

Abstract

A new approach to integrate high quality(Q)-factor 3-D vertical cavity filters with patch antennas into a single unit is presented in this paper. This integrated filter/antenna system exhibits small footprint, high efficiency, and enhanced bandwidth. The patch antenna is designed to provide an additional transmission pole for the filtering function and work as a highly efficient radiator. In addition, this integrated patch antenna with a filter can achieve a bandwidth much larger than a standalone patch antenna with the same geometry. A prototype three-pole Chebyshev filter/antenna is demonstrated at X band. The center frequency and fractional bandwidth of the filter/antenna system are 10.27 GHz and 8.7%, respectively. Due to the high Q factor (~700) of the cavity resonator and near lossless transition between the antenna and filter, the overall efficiency of the filter/antenna system is simulated to be as high as 91%. The reduced footprint, enhanced bandwidth, and lowloss performance of these integrated filter/antenna systems make them particularly useful for phased array applications. The measured impedance matching, efficiency, gain, and radiation pattern closely agree with simulation results.

Co‐designed substrate‐integrated waveguide filters with patch antennas

“…Unlike [9,10], high-Q-factor SIW resonators were utilised to obtain highly efficient integrated filter/antenna systems. This paper expands on the results presented in [11] and provides all the necessary details of the synthesis technique.…”

“…A new way to realise integrated high-Q filters with highly efficient patch antenna was presented in [11]. The high-Q filters integrated with patch antennas are compared with filters integrated with slot antennas in [12].…”