Ferrite bias lines for use with GaAs IMPATT diodes |
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Authors: | Braddock P.W. Hodges R.D. |
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Affiliation: | Royal Radar Establishment, Great Malvern, UK; |
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Abstract: | Lowpass ferrite-bead bias filters are used to suppress high-frequency bias oscillations and enhanced noise components obtained when high-efficiency GaAs IMPATT diodes (uniformly doped n-type and Read) are operated as free-running oscillators and saturated amplifiers in broadband (low Q factor) r.f. coaxial circuits with distributed-line bias arms. The impedance properties of the ferrite beads have been measured up to a frequency of 2 GHz, which has resulted in a 4-stage bias-filter prototype being realised. Also incorporated is a simple r.f. low-shunt-capacitive choke that reduces the loss on the main coaxial r.f. cavity to less than 0.2 dB over the frequency range 7?12 GHz. |
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