TR mdoule design63 1 DESINING T/R MODULE FOR ACTIVE PHASED ARRAY RADAR* Wojciech Wojtasiak, Daniel G r y g l e w s k i ,Tadeusz Morawski', Edward Sedek.' Abstract: The paper presents the conception and the performances of the L- and C-band T R modulefor active phased array radar (APAR). The transmitters were optimized for minimum transmittance distortions and maximum output power level. The used method was based on self-invented electro-thennal MESFET model. The receivers were optimized with respect to minimum noise &re and "'mum resistance for input power. The most important parameters of the TR modules are as follow: L-band: P,,=IOOW, AIq 1. Introduction There are two ideas of APAR shown in fig.l [l].The radiation direction change in……