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US 10,855,246 B2Granted
Enhancing isolation in hybrid-based radio frequency duplexers and multiplexers
AssigneeQorvo US, Inc.
InventorSam Mandegaran
Life of this patent
Estimating the term…
Abstract
A radio frequency (RF) duplexer may comprise quadrature hybrid couplers and RF filters. The isolation and insertion loss of such RF duplexer, often limited by practical imperfections such as component mismatches and layout asymmetries, may be improved by including capacitors in the RF duplexer. A tunable or reconfigurable RF duplexer with high isolation and low insertion loss, under all desired settings, may be realized by adding tunable capacitors to the tunable RF duplexer which includes the quadrature hybrid couplers and tunable RF filters.
Claims20
A radio frequency duplexer, comprising:
- a first port;
- a second port;
- a third port;
- a first quadrature hybrid coupler and a second quadrature hybrid coupler;
- a pair of filters including a first filter and a second filter;
- a terminating impedance;
- and
- a first capacitor,
- wherein:
- a first terminal and a second terminal of the first filter are respectively coupled to a second terminal of the first quadrature hybrid coupler and a first terminal of the second quadrature hybrid coupler;
- a first terminal and a second terminal of the second filter are respectively coupled to a third terminal of the first quadrature hybrid coupler and a fourth terminal of the second quadrature hybrid coupler, respectively;
- the terminating impedance is coupled to a third terminal of the second quadrature hybrid coupler;
- and
- a first terminal and a second terminal of the first capacitor are respectively coupled to a first terminal and a fourth terminal of the first quadrature hybrid coupler, or respectively coupled to the second terminal and the third terminal of the first quadrature hybrid coupler, or respectively coupled to the first terminal and the fourth terminal of the second quadrature hybrid coupler, or respectively coupled to a second terminal and the third terminal of the second quadrature hybrid coupler, wherein the first capacitor is not included in the first quadrature hybrid coupler, is not included in the second quadrature hybrid coupler, and is not included in each filter of the pair of filters.
11 more elements
A tunable radio frequency duplexer, comprising:
- a first port;
- a second port;
- a third port;
- a first quadrature hybrid coupler;
- a second quadrature hybrid coupler;
- a first tunable radio frequency filter;
- a second tunable radio frequency filter;
- a third tunable radio frequency filter;
- a terminating impedance;
- a first tunable capacitor;
- and
- a second tunable capacitor,
- wherein:
- the third tunable radio frequency filter is similarly structured as the second radio frequency tunable filter,
- a first terminal and a second terminal of the first tunable radio frequency filter are respectively coupled to the first port and a first terminal of the first quadrature hybrid coupler,
- a first terminal and a second terminal of the second tunable radio frequency filter are respectively coupled to a second terminal of the first quadrature hybrid coupler and a first terminal of the second quadrature hybrid coupler,
- a first terminal and a second terminal of the third tunable radio frequency filter are respectively coupled to a third terminal of the first quadrature hybrid coupler and a fourth terminal of the second quadrature hybrid coupler, respectively,
- the terminating impedance is coupled to a third terminal of the second quadrature hybrid coupler,
- a second terminal of the second quadrature hybrid coupler is coupled to the second port,
- a fourth terminal of the first quadrature hybrid coupler is coupled to the third port,
- a first terminal of the first tunable capacitor is coupled to the first terminal of the first quadrature hybrid coupler, or the second terminal of the first quadrature hybrid coupler, or the first terminal of the second quadrature hybrid, or the second terminal of the second quadrature hybrid coupler,
- a second terminal of the first tunable capacitor is coupled to a ground,
- a first terminal of the second tunable capacitor is coupled to the third terminal of the first quadrature hybrid coupler, or the fourth terminal of the first quadrature hybrid coupler, or the third terminal of the second quadrature hybrid coupler, or the fourth terminal of the second quadrature hybrid coupler,
- a second terminal of the second tunable capacitor is coupled to a ground, and
- the first tunable capacitor is not included in the second tunable radio frequency filter, and the second tunable capacitor is not included in the third tunable radio frequency filter.
22 more elements
A radio frequency duplexer, comprising:
- a first port;
- a second port;
- a third port;
- a first quadrature hybrid coupler and a second quadrature hybrid coupler;
- a pair of filters including a first filter and a second filter;
- a terminating impedance;
- and
- at least one transmission line,
- wherein:
- a first terminal and a second terminal of the first filter are respectively coupled to a second terminal of the first quadrature hybrid coupler and a first terminal of the second quadrature hybrid coupler;
- a first terminal and a second terminal of the second filter are respectively coupled to a third terminal of the first quadrature hybrid coupler and a fourth terminal of the second quadrature hybrid coupler, respectively;
- the terminating impedance is coupled to a third terminal of the second quadrature hybrid coupler;
- and
- the at least one transmission line connects the second terminal of the first quadrature hybrid coupler and the first terminal of the first filter, or the third terminal of the first quadrature hybrid coupler and the first terminal of the second filter, or the first terminal of the second quadrature hybrid coupler and the second terminal of the first filter, or the fourth terminal of the second quadrature hybrid coupler and the second terminal of the second filter, wherein a characteristic impedance and a length of the at least one transmission line are configured to improve isolation or an insertion loss of the radio frequency duplexer.
11 more elements
Dependencies are inferred from the claim text.