SIW-Feed for 20 GHz Active Phased Array (1024-Element) Antenna with Modular Architecture

In this paper, the simulation and measurement results of 64-way substrate integrated waveguide (SIW) power splitter/combiner suitable for 1024 ( $32\times 32$ )-element active phased array antenna (A-PAA) with modular architecture are presented. In the design, the structure of SIW feed has 64 outputs with separation equal to $2\lambda_{0} (\lambda_{0}$ : free-space wavelength @ 20 GHz). The measured results shows an average insertion loss less than 2.5 dB with phase variation less than 10 deg. over the operating bandwidth 18.6-20.2 GHz.