Air Substrate Slot Array Based on Channelized Coplanar Waveguide

A new structure of planar air substrate slot antenna array based on air-filled channelized coplanar waveguide is proposed. By blocking the channelized coplanar waveguide alternatively and periodically, the subslot array is constructed. By connecting eight subslot arrays in a mirrored way, the proposed planar slot antenna array is built. A line source is used as the feed network, and the center-fed approach is adopted to suppress beam tilt. Because of the layout of the proposed slot array and the feed network, the shorting walls at the interconnecting planes of the neighboring subarrays can be removed, resulting in a compact structure. A prototype with a gain up to 22.75 dBi and an impedance bandwidth of 6.4% is fabricated to demonstrate the design strategy.