Systems and methods that employ a balanced duplexer
First Claim
1. A balanced duplexer, comprising:
- a first filter comprising one of a bulk acoustic wave BAW filter and a surface acoustic wave SAW filter;
a second filter comprising the other one of a bulk acoustic wave BAW filter and a surface acoustic wave SAW filter, the first and second filters having a substantially similar input and output impedance;
a first coupler that interfaces the first and second filters to a processing unit of a device and the first coupler interfaces a first termination; and
a second coupler that interfaces the first and second filters to each of an antenna, a detector and a second termination, wherein the balanced duplexer is employed to facilitate transmitting and receiving signals, each signal having a respective signal power, through the first and second filters.
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Abstract
The present invention relates to systems and methods that employ a novel balanced duplexer that can be utilized to facilitate concurrent signal transmission and reception. The systems and methods can be employed within mobile devices such as cell phones and utilize two-filters (e.g., acoustic) with substantially similar input/output impedances interfaced with two couplers (e.g., 3 dB hybrid), which provide isolation and maintain the duplexer'"'"'s input/output impedance. The couplers interface the filters to front/back ends such as signal processors, transmitters and receivers. The novel aspects of the present invention mitigate the need to employ external directional couplers between the duplexer and front/back ends. In addition, the two-filter topology enables employment of lower powered rated filters. The systems and methods further provide for separation and isolation of transmitters and receivers, which reduces noise coupling and enables the transmitter and receiver to be placed within close proximity.
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Citations
13 Claims
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1. A balanced duplexer, comprising:
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a first filter comprising one of a bulk acoustic wave BAW filter and a surface acoustic wave SAW filter; a second filter comprising the other one of a bulk acoustic wave BAW filter and a surface acoustic wave SAW filter, the first and second filters having a substantially similar input and output impedance; a first coupler that interfaces the first and second filters to a processing unit of a device and the first coupler interfaces a first termination; and a second coupler that interfaces the first and second filters to each of an antenna, a detector and a second termination, wherein the balanced duplexer is employed to facilitate transmitting and receiving signals, each signal having a respective signal power, through the first and second filters. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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Specification