A Planar Filtenna Array Implemented by Embedding the Filtering Function into the SIW Power Divider

In this paper, a novel filtenna (filtering antenna) array is proposed and implemented by embedding the passband filtering function into the power divider feeding network. The proposed array antenna combines filtering, power division and radiation functions according to the classical coupling matrix theory. Besides, the antenna is built in one-layer substrate to achieve low profile and high integration goals. A substrate integrated waveguide (SIW) fourth-order Chebyshev filter is co-designed and embedded into the power divider and the slot radiation elements. The measured impedance matching, gain, and radiation patterns closely agree with simulation results. The center frequency and fractional bandwidth are 24.55GHz and 4.48%, respectively. The measured gain at the center frequency is 7.7dB, and the radiation gain performs a significant filtering characteristic.