WIDEBAND ELECTRONICALLY TUNABLE CAVITY FILTERS

摘要

An apparatus to filter electromagnetic waves includes a cavity and one or more tuning circuits. The cavity is configured to receive the electromagnetic waves and has a resonant frequency. The one or more tuning circuits are disposed proximate to or in the cavity. The one or more tuning circuits and the cavity are configured to filter the electromagnetic waves and the resonant frequency of the cavity is based on the one or more tuning circuits.

主权项

1. An apparatus for filtering electromagnetic waves, the apparatus comprising:
a cavity configured to receive the electromagnetic waves and having a resonant frequency; and one or more tuning circuits disposed proximate to the cavity, wherein the one or more tuning circuits and the cavity are configured to filter the electromagnetic waves, and the resonant frequency of the cavity is based on the one or more tuning circuits, wherein the one or more tuning circuits comprise at least one of: one or more transistors, resistors, inductors, and capacitors configured to create a negative equivalent series resistance (ESR), and a varactor tunable by a controlled voltage configured to provide a capacitance determined in accordance with the resonant frequency of the cavity.