June 22, 2002 Research Activities: Girish P. Saraph Microwave, RF/ Wireless, & Optical Communication Microwave Engineering: - High power microwave amplifiers - Radar systems & components - Microwave components or structures RF/ Wireless Communication: - Design & testing of RF/ Wireless systems Optical Communication & Networks: - Study of optical devices & structures - Network performance

June 22, 2002 High Power Microwave Devices Narrowband klystrons for accelerators: - Applications in medical accelerators (X-rays) - Nuclear transmutation - Particle physics experiments Interaction with CEERI (Pilani), SAMEER, BARC Broadband klystrons & TWT’s for radars: - Air-traffic control and weather radars - Air-defense, fire-control, missile-guidance radars Interaction with DRDO labs Communication applications: - Satellite up-links - Radio & TV transmitters and relays Broadband studies project funded by DIT

June 22, 2002 Filter post Termination July 6, 2001 Length E-Field Filter location Dielectric slab1 Dielectric slab2 Dielectric slab3 Dielectric slab4 λg / 2 Passive resonance Output cavity fields Filter-Loaded Output Circuit For Broadband Klystrons Design Optimization of Microwave Devices using HFSS Simulations

June 22, 2002 Extended Interaction Output Circuit HFSS model Scattering parameters using equivalent circuit model

June 22, 2002 RF / Wireless Communication Laboratory facilities for test & measurement: - RF signal generator & spectrum analyzer - Vector network analyzer - Oscilloscopes, frequency counters, etc. Design & testing of RF electronic modules: - mixers, amplifiers, filters, etc. On-going activity to set-up wireless link in modular form for different laboratory experiments

June 22, 2002 Optical Communication & Networks Modal analysis of passive structures - Scattering matrix treatment for cascaded microwave & optical structures - Determination of coupling, reflection, & losses - Measurement of refractive index profiles in fibers Optical switches or routers - Control or decision making in the optical domain Throughput in layered networks - IP over ATM over SONET layers - Effect of congestion, buffer capacity, & QoS New concepts in packet routing - Simplification of look-up tables in routing - Cost function based on congestion, link costs, QoS