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PIER PIER B PIER C PIER M PIER Letters PIER Photonics
2013-07-19
MEMS Compatible Sever for 220 GHz Ultra Wide Band Twta: Design and Particle-in-Cell Analysis
By
Anisullah Baig,

    Dr. Anisullah Baig

    ECE

    University of California Davis

    USA

    Homepage

Larry R. Barnett,

    Dr. Larry R. Barnett

    Mt Technol

    USA

    Homepage

Diana Gamzina,

    Dr. Diana Gamzina

    Department of Electrical and Computer Engineering

    University of California

    USA

    Homepage

Neville C. Luhmann, Jr.

    Dr. Neville C. Luhmann, Jr.

    Electrical and Computer Engineering

    University of California

    USA

    Homepage

Progress In Electromagnetics Research Letters, Vol. 41, 135-148, 2013
doi:10.2528/PIERL13032013 | Google Scholar

Abstract
We report a MEMS (micro-electro-mechanical systems) compatible distributed loss type sever design for the 220 GHz double vane half period staggered traveling-wave tube amplifier (TWTA) [1]. The cold test simulations for a full TWT model including input/output couplers and broadband tapered vane transitions incorporating the sever, predicted a return loss (S11) of < -10 dB in the pass band (205 GHz-275 GHz) while an insertion loss/isolation (S21) of < ~-27 dB. The return loss of the TWT circuit did not degrade by the inclusion of the sever (< -10 dB) while still maintaining a good isolation (S21) for the RF signal. Particle-In-Cell (PIC) simulation analysis for the full 220 GHz TWT circuit (a) without sever and (b) with sever was conducted. With the inclusion of the sever, the TWTA showed generally a stabilized output response for all cases. The maximum power from the long sever case was ~25 W for Pin ~50 mW and the gain was ~27 dB. The reverse power was decreased to ~30 mW. For the short sever, the PIC results were even better with a maximum output power of ~62 W and a gain of ~30.92 dB with a reduced reverse power of ~5 mW for an input power of 50 mW at 220 GHz. The FFT spectrum of the RF signal at the output port also showed a spectrally pure waveform at 220 GHz.
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Citation
Anisullah Baig, Larry R. Barnett, Diana Gamzina, and Neville C. Luhmann, Jr., "MEMS Compatible Sever for 220 GHz Ultra Wide Band Twta: Design and Particle-in-Cell Analysis," Progress In Electromagnetics Research Letters, Vol. 41, 135-148, 2013.
doi:10.2528/PIERL13032013
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