DUPLEXER

摘要

A duplexer having good insulation, small geometric dimensions and good decoupling of the transmit signal path from an antenna which may have poor matching is specified. To that end, the duplexer comprises two transmit filters, a receive filter and two 90° hybrids.

主权项

1. A duplexer comprising
an antenna terminal, a transmit terminal and a receive terminal, two transmit filters and one receive filter and, a first and a second 90° hybrid, each hybrid having a first, second, third and fourth terminal, the antenna terminal being interconnected with the first terminal of the first hybrid, the receive filter being interconnected between the third terminal of the first hybrid and the receive terminal, one of the transmit filters being interconnected between the fourth terminal of the first hybrid and the second terminal of the second hybrid, the other one of the transmit filters being interconnected between the second terminal of the first hybrid and the fourth terminal of the second hybrid, the transmit terminal being interconnected with the first terminal of the second hybrid.