Duplexer
First Claim
Patent Images
1. A duplexer comprising:
- an antenna terminal;
a transmit terminal;
a receive terminal;
a first and second transmit filter;
a receive filter;
a first 90°
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; and
a second 90°
hybrid having a first, second, third and fourth terminal, the first transmit filter being interconnected between the fourth terminal of the first hybrid and the second terminal of the second hybrid, the second transmit filter being interconnected between the second terminal of the first hybrid and the fourth terminal of the second hybrid, and the transmit terminal being interconnected with the first terminal of the second hybrid,wherein receive signalsare conveyed from the second and fourth terminals of the first hybrid to the first and second transmit filters,are reflected by the first and second transmit filters, andare conveyed to the receive filter via the third terminal of the first hybrid.
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Accused Products
Abstract
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.
20 Citations
11 Claims
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1. A duplexer comprising:
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an antenna terminal; a transmit terminal; a receive terminal; a first and second transmit filter; a receive filter; a first 90°
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; anda second 90°
hybrid having a first, second, third and fourth terminal, the first transmit filter being interconnected between the fourth terminal of the first hybrid and the second terminal of the second hybrid, the second transmit filter being interconnected between the second terminal of the first hybrid and the fourth terminal of the second hybrid, and the transmit terminal being interconnected with the first terminal of the second hybrid,wherein receive signals are conveyed from the second and fourth terminals of the first hybrid to the first and second transmit filters, are reflected by the first and second transmit filters, and are conveyed to the receive filter via the third terminal of the first hybrid. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification