Theoretical Study of Millimeter Wave Harmonic Oscillator Stabilized with a Transmission Cavity |
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Authors: | Dalong Zhu and Jinping Xu |
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Institution: | (1) State Key Lab. of Millimeter Waves, Southeast University, Nanjing, 210096, People’s Republic of China |
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Abstract: | An equivalent circuit model of millimeter wave second harmonic oscillator stabilized with a transmission cavity has been proposed
for constructing analytical formulations between performance parameters of the oscillator and parameters of the circuit. The
model consists of an equivalent circuit of fundamental wave and that of second harmonic wave. Each of the circuits comprises
circuit models of main cavity, transmission waveguide, and transmission cavity. Absorbing material placed between the transmission
waveguide and the transmission cavity can suppress additional resonances originated from transmission cavity. The behavior
of the second harmonic oscillator can be effectively described by the circuit model. Furthermore, based on this model, mechanical
tuning characteristics have been studied at first, and then analytical formulas for quality factor and efficiency depending
on circuit parameters have been derived. The circuit parameters can be conveniently extracted by electromagnetic field simulation.
Hence the formulas exhibit both compact form and enough accuracy. Thereafter, general rules of performance parameters varying
with circuit parameters have been deduced for the harmonic oscillators. Then some design considerations have been derived
according to the corresponding analysis. The equivalent circuit model is useful for designing and adjusting millimeter wave
second harmonic stabilizing oscillator with a transmission cavity. |
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Keywords: | Transmission cavity Millimeter wave harmonic oscillator Mechanical tuning characteristics Quality factor Efficiency |
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