Patent ID: 6507253
Filing Date: 2003-01-14
Classification: H03H

Abstract:
A delay circuit, comprising:a power divider for distributing an input signal having an amplitude and a phase, said input signal having a first part, and a second part; a circulator having a first terminal for inputting the first part of the input signal, a third terminal for outputting the signal inputted to the first terminal, a second terminal interposed between the first terminal and the third terminal, in which the circulator regulates a flow direction of the signal from the first terminal to the second terminal; said circulator having a leakage signal flow from the first terminal directly to the third terminal without passing through the second terminal, said leakage signal having an amplitude and a phase; an open-ended transmission line having a connected end connected to the second terminal and having an open-end at an end opposite to the connected end; a gain-phase adjustment circuit for regulating the amplitude and/or phase of the second part of the distributed input signal sufficient to offset the leakage signal; the amplitude of the gain phase adjustment circuit being substantially the same as the leakage signal and the phase of the gain phase adjustment circuit being substantially inverse relative to the phase of the leakage signal; a power combiner for outputting composite signals composed of an output signal from the third terminal and an output signal from the gain-phase adjustment circuit.