Optimization Of A Planar Orotron

J. E. Walsh; J. A. Jackson; E. M. Marshall

doi:10.1117/12.978366

18 November 1989 Optimization Of A Planar Orotron

J. E. Walsh, J. A. Jackson, E. M. Marshall

Proceedings Volume 1039, 13th Intl Conf on Infrared and Millimeter Waves; (1989) https://doi.org/10.1117/12.978366
Event: 13th International Conference on Infrared and Millimeter Waves, 1987, Honolulu, HI, United States

Abstract

The Planar Orotron has traditionally consisted of a uniform, rectangular metal grating opposed by a planar conductor (Fig. la)Unbounded at the sides, this open resonator supports travelling waves with frequencies which are determined by the grating dimensions. The dispersion and gain characteristics for this device have been documented theoretically and experimentally in the low beam voltage (5 - 20 kV) regime,1 where powers of up to 2 kW and efficiencies of a few percent at 35 GHz have been recorded. In the frequency range of 150 to 175 GHz , output powers are typically less than 1 W, and efficiencies less than 0.5%. Attempts to improve the output power and efficiency by modifying the resonator design are currently underway in the 30-40 GHz range. Among the new designs are the following, which appear in Figures 1 and 2: 1) A uniform grating is opposed by an identical uniform grating, with a symmetric orientation in the resonator. (Fig. lb) 2) A uniform grating is opposed by an identical uniform grating, with an antisymmetric orientation in the resonator. (Fig. lc) 3) The uniform grating is replaced by a grating with a slight taper (< 10%) and opposed by a conducting plane. (Fig. 2a) 4) The tapered grating is opposed by an identical tapered grating with a symmetric orientation in the resonator. (Fig. 2b) The grating and resonator parameters of interest are shown in the Figures. They are the period, l, and the ratios of groove depth to grating period, d/1 , groove width to grating period, s/l , and the ratio of inner resonator height to grating period, (b-d)/l. In Fig. 2, the groove depth, d, and the distance from the base of the slot to the surface of the opposing component, b, are both functions of the axial position, z.

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J. E. Walsh, J. A. Jackson, and E. M. Marshall "Optimization Of A Planar Orotron", Proc. SPIE 1039, 13th Intl Conf on Infrared and Millimeter Waves, (18 November 1989); https://doi.org/10.1117/12.978366

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