Duplexer filter having harmonic rejection to control flyback
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United States of America Patent
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-
Jun 11, 1991
Issued Date -
N/A
app pub date -
May 22, 1989
filing date -
Feb 27, 1987
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A radio frequency duplexer filter for a duplex transceiver is disclosed. To prevent spurious signals conducted by flyback responses of the transmit bandpass filter 103 from reaching the antenna (105), a band reject circuit consisting of third harmonic quarter-wave transmission line stubs (601 and 603) are advantegeously coupled to an output transmission line (107). Likewise, to prevent spurious signals conducted by flyback responses of the receive bandpass filter (113) from reaching the receiver (109), a band reject circuit consisting of third harmonic quarter-wave transmission line stubs (605 and 607) are advantageously coupled to an input transmission line (111).
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