Sieganschin, AntonAntonSieganschinJaschke, ThomasThomasJaschkeJacob, ArneArneJacob2021-07-302021-07-302021-07International Journal of Microwave and Wireless Technologies 13 (6): 595-601 (2021-07)http://hdl.handle.net/11420/10005This contribution deals with a frontend for interleaved receive (Rx)-/transmit (Tx)-integrated phased arrays at K-/Ka-band. The circuit is realized in printed circuit board technology and feeds dual-band Rx/Tx- and single-band Tx-antenna elements. The dual-band element feed is composed of a substrate-integrated waveguide (SIW) diplexer with low insertion loss, a low-noise amplifier (LNA), a bandpass filter, and several passive transitions. The compression properties of the LNA are identified through two-tone measurements. The results dictate the maximum allowable output power of the power amplifier. The single band feed consists of a SIW with several transitions. Simulation and measurement results of the individual components are presented. The frontend is assembled and measured. It exhibits an Rx noise figure of 2 dB, a Tx insertion loss of ~ 2.9 dB, and an Rx/Tx-isolation of 70 dB. The setup represents the unit cell of a full array and thus complies with the required half-wave spacing at both Rx and Tx.en1759-078720216595601frontendfull-duplexK-band, Ka-bandlow noisephased arrayRx/Tx-integrationSatellite communication (SatCom)Journal Article10.1017/S1759078721000404Other