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US 5,703,545 AGranted
High frequency filter circuit
AssigneeDeutsche Thomson-Brandt GmbH
InventorsGerald Dullberg, Herbert Peusens, Veit Armbruster
Life of this patent
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Abstract
A filter circuit having an amplifier stage, an upstream filter and a downstream bandpass filter. The filter includes, inter alia, a rejection circuit tuned to an intermediate frequency and a series circuit, tuned to an image frequency and formed by a capacitor and a .lambda./4 coaxial stub. The inductance formed by the coaxial stub is shared by the series circuit and the rejection circuit.
Claims16
Filter circuit comprising:
- an amplifier stage,
- a bandpass filter coupled downstream of the amplifier stage, and
- a filter coupled upstream of the amplifier stage and has at least one trap comprising a rejection circuit tuned to an intermediate frequency, and a series-tuned circuit tuned to an image frequency,
- the rejection circuit and the series-tuned circuit have a common inductance.
1 more element
Dependencies are inferred from the claim text.