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A zigzag shaped, single band, small size Planar Inverted F antenna (PIFA) at 2.45 GHz is introduced and investigated. Total size of the antenna is 15mm × 6 mm which complies easily for integration with other devices viz. USB dongle. S11 of −32 dB at 2.45 GHz with −10 dB bandwidth of 4.2% has been obtained. Gain of the antenna is −1.82 dBi and pattern is omnidirectional. For proper matching with 50...
This paper briefly presents the details of the design of a K-Ka band, 40 W CW, millimeter-wave helix TWT. Sub-system level design and TWT development issues are also presented.
Nonlinear analysis of a high-power gyro-TWT amplifier operating in TE01 mode has been investigated through particle-in-cell (PIC) simulation using CST-studio. The simulation results are validated against published results with close accuracy. The simulation predicts 150 kW output power at 34 GHz with 21% efficiency, 48 dB saturated gain and 1.3 GHz bandwidth.
Small-signal analysis of a plasma-filled helix traveling-wave tube was developed following Eulerian hydrodynamic approach. The electron beam was treated as a moving charged fluid and the plasma a stationary quasi-neutral fluid. The coupled circuit and electronic equation was developed and a Pierce-type hot dispersion relation obtained, which was then interpreted for the gain-frequency response of...
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