DUPLEXER, CIRCUIT STRUCTURE THEREOF AND RF TRANSCEIVER APPARATUS COMPRISING THE DUPLEXER

摘要

A duplexer is provided, which includes a first, a second and a third signal ports; a first filter and a second filter. The first filter has first, second, and third resonant circuits that have first, second and third inductors, respectively. The first, second and third inductors are mutually inductive. The first and third resonant circuits are electrically connected to the first and second signal ports, respectively. The second filter has fourth, fifth and sixth resonant circuits that have fourth, fifth and sixth inductors, respectively. The fourth resonant circuit is connected in series with the first resonant circuit. The fifth inductor and the fourth inductor are mutually inductive. The sixth resonant circuit is electrically connected to the third signal port. The second filter further has a main capacitor connected in series with the fifth and sixth resonant circuits respectively and located therebetween.

主权项

1. A circuit structure of a duplexer, comprising:
a first circuit layer, comprising:
a main capacitor;a first, a second, a third, a fourth, a fifth and a sixth capacitors;a second inductor connected in parallel with the second capacitor to form a second resonant circuit; anda first half inductor; and a second circuit layer formed on the first circuit layer, the second circuit layer comprising:
a first inductor connected in parallel with the first capacitor to form a first resonant circuit, wherein the first inductor and the second inductor are mutually inductive;a third inductor connected in parallel with the third capacitor to form a third resonant circuit, wherein the third inductor and the second inductor are mutually inductive, and the first, second and third resonant circuits form a first filter;a fourth inductor connected in parallel with the fourth capacitor to form a fourth resonant circuit, wherein the fourth resonant circuit is connected in series with the first resonant circuit;a second half inductor connected in series with the first half inductor such that the first half inductor and the second half inductor form a fifth inductor, wherein the fifth inductor is connected in parallel with the fifth capacitor to form a fifth resonant circuit, and the fifth inductor and the fourth inductor are mutually inductive;a sixth inductor connected in parallel with the sixth capacitor to form a sixth resonant circuit, wherein the sixth resonant circuit, the main capacitor, and the fifth resonant circuit are connected in series, and the fourth, fifth and sixth resonant circuits form a second filter;a first signal port electrically connected to the first resonant circuit;a second signal port electrically connected to the third resonant circuit; anda third signal port electrically connected to the sixth resonant circuit.