Compact true time delay line with partially shielded coplanar waveguide transmission lines

This paper presents a method to attain a compact true time delay line with a partially shielded coplanar waveguide transmission line. Closely spaced air bridges were utilized to reduce the coupling effects between neighboring coplanar waveguide transmission lines. The proposed method is compatible with foundry´s GaAs standard process and allows the transmission line to be compact and achieve a small sized true time delay line circuit. A true time delay line of approximately 85ps was fabricated and tested.