Broadband, microwave, two-stage, stagger-tuned, field effect transistor amplifier
First Claim
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1. A microwave integrated circuit amplifier for amplifying a wide bandwidth in the microwave region comprising:
- microstrip means for providing distributed circuits for tuning;
first microwave FET means, including at least one microwave FET, connected to said microstrip and tuned by said microstrip to the upper cutoff of said bandwidth for providing a high-gain frequency response at the upper cutoff region of said bandwidth;
second microwave FET means, including at least one microwave FET, connected to said microstrip and tuned by said microstrip to the lower cutoff of said bandwidth for providing a high-gain frequency response at the lower cutoff region of said bandwidth; and
microstrip isolator means connected to said microstrip and further connected between said first and second microwave FET means for passing a signal in only one direction between said first and second microwave FET means.
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Abstract
A microwave-integrated-circuit amplifier provides a broadband response in e region of 1-10 GHz. The amplifier includes: a microstrip which provides distributed circuit values for tuning; first and second microwave FETs included in the microstrip and tuned to the upper and lower cutoffs of the bandwidth, respectively; and a non-reciprocal microwave isolator which passes a signal in only one direction and is connected between the first and second microwave FETs.
56 Citations
6 Claims
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1. A microwave integrated circuit amplifier for amplifying a wide bandwidth in the microwave region comprising:
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microstrip means for providing distributed circuits for tuning; first microwave FET means, including at least one microwave FET, connected to said microstrip and tuned by said microstrip to the upper cutoff of said bandwidth for providing a high-gain frequency response at the upper cutoff region of said bandwidth; second microwave FET means, including at least one microwave FET, connected to said microstrip and tuned by said microstrip to the lower cutoff of said bandwidth for providing a high-gain frequency response at the lower cutoff region of said bandwidth; and microstrip isolator means connected to said microstrip and further connected between said first and second microwave FET means for passing a signal in only one direction between said first and second microwave FET means. - View Dependent Claims (2, 3, 6)
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4. A method for obtaining wide bandwidth amplification of a microwave signal with a microwave-integrated-amplifier comprising the steps of:
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amplifying said microwave signal with a first microwave FET tuned, by means of distributed circuits of a microstrip, to the upper cutoff region of said bandwidth; amplifying said first amplified microwave signal with a second microwave FET tuned, by means of distributed circuits of a microstrip, to the lower cutoff region of said bandwidth; and providing isolation between said first and second microwave FET by a microwave isolator which passes signals in only one direction from the first to the second microwave FET.
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5. A method for obtaining a wideband microwave response from a microwave-integrated-amplifier comprising the steps of:
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tuning a first microwave FET, by means of distributed circuit elements of a microstrip, to the lower-cutoff region of said bandwidth; tuning a second microwave FET, by means of distributed circuit elements of a microstrip, to the upper-cutoff region of said bandwidth; and providing isolation between said first and second microwave FETs by a microwave isolator which passes signal in only one direction from the first to the second microwave FETs.
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Specification