TWT with mismatched section for controlled gain variation with frequency
First Claim
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1. A slow wave RF amplifier circuit housed within a vacuum envelope, said amplifier circuit having an an RF input section and an RF output section, said amplifier circuit having an amplification gain variation, Δ
- G, over a frequency range Δ
f, centered on a preselected frequency f0, said amplifier circuit comprising;
a Gain Control Section (GCS) having a length LC, said GCS coupled between said RF input section and said RF output section;
a first mismatch section coupled between said RF input section and said GCS, said first mismatch section having a voltage reflection coefficient, Ra ;
a second mismatch section coupled between said GCS and said RF output section, said second mismatch section having a voltage reflection coefficient, Rb ; and
said first and second mismatch sections operative to create internal reflections in the GCS which produce a ripple signal therein effective to modify said gain variation, Δ
G, over said frequency range, Δ
f.
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Abstract
Apparatus compensating for gain variations versus frequency of a traveling wave tube (TWT) is disclosed. The apparatus provides an RF interaction circuit section designed with specified mismatches causing internal reflections of the RF waves, such that the overall gain response is flattened out or inverted.
8 Citations
16 Claims
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1. A slow wave RF amplifier circuit housed within a vacuum envelope, said amplifier circuit having an an RF input section and an RF output section, said amplifier circuit having an amplification gain variation, Δ
- G, over a frequency range Δ
f, centered on a preselected frequency f0, said amplifier circuit comprising;a Gain Control Section (GCS) having a length LC, said GCS coupled between said RF input section and said RF output section; a first mismatch section coupled between said RF input section and said GCS, said first mismatch section having a voltage reflection coefficient, Ra ; a second mismatch section coupled between said GCS and said RF output section, said second mismatch section having a voltage reflection coefficient, Rb ; and said first and second mismatch sections operative to create internal reflections in the GCS which produce a ripple signal therein effective to modify said gain variation, Δ
G, over said frequency range, Δ
f. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
- G, over a frequency range Δ
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13. A slow wave RF amplifier circuit housed within a vacuum envelope, said amplifier circuit having an RF output section, said amplifier circuit having an amplification gain variation, Δ
- G, over a frequency range, Δ
f, centered on a preselected frequency, f0, said amplifier circuit comprising;an RF input and gain control section having a length, LC ; a first mismatch section externally coupled to said RF input and gain control section, said first mismatch section having a voltage reflection coefficient, Ra ; a second mismatch section coupled between said RF input and gain control section and said RF output section, said second mismatch section having a voltage reflection coefficient, Rb ; and said first and second mismatch sections operative to create internal reflections in the RF input and gain control section which produce a ripple signal therein effective to modify the gain variation, Δ
G, over said frequency range, Δ
f. - View Dependent Claims (14, 15, 16)
- G, over a frequency range, Δ
Specification