Tunable notch duplexer
First Claim
1. A duplexer for a communication system, the duplexer coupled to a transmitter configured to transmit a transmit signal at a first frequency in a first frequency range and to a receiver configured to receive a receive signal at a second frequency in a second frequency range, the duplexer comprising:
- a first tunable band reject filter coupled to the receiver and tunable to reject the first frequency in the first frequency range; and
a second tunable band reject filter coupled to the transmitter and tunable to reject the second frequency in the second frequency range.
3 Assignments
0 Petitions
Accused Products
Abstract
A duplexer for bidirectional communication systems includes tunable band reject filters. The tunable band reject filter on the receiver side can be tuned to reject the transmit signal frequency, and the tunable band reject filter on the transmitter side can be tuned to reject the receive signal frequency. Thus, the band reject filters allow for simultaneous tuning of the band reject frequencies on the transmission side and the reception side. The tunable band reject filters can be implemented as resonators including barium strontium titanate (BST) capacitors of which the capacitance can be tuned according to bias voltages applied to the BST capacitors.
75 Citations
11 Claims
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1. A duplexer for a communication system, the duplexer coupled to a transmitter configured to transmit a transmit signal at a first frequency in a first frequency range and to a receiver configured to receive a receive signal at a second frequency in a second frequency range, the duplexer comprising:
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a first tunable band reject filter coupled to the receiver and tunable to reject the first frequency in the first frequency range; and
a second tunable band reject filter coupled to the transmitter and tunable to reject the second frequency in the second frequency range. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A duplexer for a communication system, the duplexer coupled to a transmitter configured to transmit a transmit signal at a first frequency in a first frequency range and to a receiver configured to receive a receive signal at a second frequency in a second frequency range, the duplexer comprising:
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first tunable band reject means coupled to the receiver and tunable to reject the first frequency in the first frequency range; and
second tunable band reject means coupled to the transmitter and tunable to reject the second frequency in the second frequency range. - View Dependent Claims (9, 10, 11)
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Specification