Design of SIW‐Based Compact and High‐Gain Filtenna Array for W‐Band

This paper proposes a compact and high‐gain filtenna array based on substrate‐integrated waveguide (SIW) technology for the W‐band (75–110 GHz) high‐speed wireless communication systems and imaging/detection systems. By utilizing the high integration of SIW technology, the SIW filter, butterfly slot antenna array, and patch antenna array are vertically integrated to form a filtenna array. Due to the vertical integration of two antenna arrays, the filtenna array achieves a smaller footprint. The use of butterfly‐shaped slot antennas increases the bandwidth of the antenna. The butterfly slot antenna array and patch antenna array each have five units. After fabrication and testing, the filtenna array achieves high gain as well as filtering function, reducing the size of the overall circuit. The filtenna array has a center frequency of 95 GHz, a bandwidth of 3 GHz, and a maximum gain of 12.95 dB.