The conclentional FDTD method is combined with the SPICE program to analyze an X-band planar balanced mixer. The aduantages of the Campus Universitario s / n 36200 Vigo Spain KEY TERMS Fiber r~~. s o n a~~r s . ~ionlineu~ oprics, optical oscillators. optical signal prow~sing ABSTRACT I n r1ii.s Lerter u'e srirdy /tie rransienr hehai,ior. of a notilinear iwo-coupler fiber-ring resorio~or operaring as im optical oscillaior. The shape of die pi1w.s genrratetl atid the speed in [lie e.sruhlishtneni of osci1lririori.s are itrr~esri~~~ted. ' ? 1096 John Wilev & Sons, Inc.

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t o r FOUAO HANNA, Louis RAMBOZ and Michel BELFORT Centre National d'Etudes des T6lGcommunications D i v i s i o n Espace e t Transmission RadioGlectrique ~ ~~ 92131 ISSY-LES-MOULINEAUX -FRANCE 1 -INTRODUCTION of the amplitude and phase i l l u m i n a t i o n f u n c t i o n s . Low sidelobe phased array antennas require precise control This paper describes the performance o f combiner networks used to form the signals sum f o r 10 feed arrays. The system cons i s t s o f a p l a n a r power divider/combiner having 10 output ports. Each p o r t i s connected to adjustable attenuator and phase s h i ft e r c i r c u i t s p r o v i d i n g a m p l i t u d e and phase c o n t r o l o f t h e system ten ports. The whole system i s r e a l i z e d c o m p l e t e l y i n m i c r o s t r i p technology. This system can find important applications i n mobile satell i t e reception and i n the design of modern communication satelv i d e r a d i a t i o n p a t t e r n r e c o n f i g u r a b i l i t y i n o r b i t i n o r d e r to l i t e antennas i n general as i n such cases it i s r e q u i r e d t o pro-