VSWR TOLERANT TUNABLE HYBRID DUPLEXER
First Claim
Patent Images
1. Duplexer circuitry for cancelling undesired signals, the duplexer circuitry comprising:
- a first hybrid coupler;
a second hybrid coupler;
a first filter with high reflectivity (Γ
) at receiving frequencies (RX) and with low reflectivity (Γ
) at transmitting frequencies (TX), and configured to filter signals between the first hybrid coupler and the second hybrid coupler;
a second filter with high reflectivity (Γ
) at receiving frequencies (RX) and with low reflectivity (Γ
) at transmitting frequencies (TX), and configured to filter additional signals between the first hybrid coupler and the second hybrid coupler; and
a phase shifter configured to shift a phase approximately 90 degrees or approximately −
90 degrees.
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Accused Products
Abstract
The disclosure describes a dual hybrid duplexer including two hybrid couplers, two intra-filters, a tunable isolation load, and a phase shifter. The phase shifter may be located at the isolation port. The phase shifter may be located at the antenna port. In one embodiment, a dual hybrid duplexer includes two hybrid couplers, two intra-filters, a tunable isolation load, a first phase shifter located at the isolation port, and a second phase shifter located at the antenna port. The first and second phase shifters have a difference of 90 degrees (plus or minus 10 degrees).
41 Citations
26 Claims
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1. Duplexer circuitry for cancelling undesired signals, the duplexer circuitry comprising:
-
a first hybrid coupler; a second hybrid coupler; a first filter with high reflectivity (Γ
) at receiving frequencies (RX) and with low reflectivity (Γ
) at transmitting frequencies (TX), and configured to filter signals between the first hybrid coupler and the second hybrid coupler;a second filter with high reflectivity (Γ
) at receiving frequencies (RX) and with low reflectivity (Γ
) at transmitting frequencies (TX), and configured to filter additional signals between the first hybrid coupler and the second hybrid coupler; anda phase shifter configured to shift a phase approximately 90 degrees or approximately −
90 degrees. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. Duplexer circuitry for cancelling undesired signals, the duplexer circuitry comprising:
-
a first hybrid coupler; a second hybrid coupler; a first filter with high reflectivity (high Γ
) at transmitting frequencies (TX) and with low reflectivity (low Γ
) at receiving frequencies (RX), and configured to filter signals between the first hybrid coupler and the second hybrid coupler;a second filter with high reflectivity (high Γ
) at transmitting frequencies (TX) and with low reflectivity (low Γ
) at receiving frequencies (RX), and configured to filter additional signals between the first hybrid coupler and the second hybrid coupler; anda phase shifter configured to shift a phase by approximately 90 degrees or approximately −
90 degrees. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. Duplexer circuitry for cancelling undesired signals, the duplexer circuitry comprising:
-
a first hybrid coupler; a second hybrid coupler; a first filter with high reflectivity (high Γ
) at receiving frequencies (RX) and with low reflectivity (low Γ
) at transmitting frequencies (TX), and configured to filter signals between the first hybrid coupler and the second hybrid coupler;a second filter with high reflectivity (high Γ
) at receiving frequencies (RX) and with low reflectivity (low Γ
) at transmitting frequencies (TX), and configured to filter additional signals between the first hybrid coupler and the second hybrid coupler;a first phase shifter configured to pass, and to shift by approximately a first value, signals passing between an isolation port of the first hybrid coupler and a tunable load; and a second phase shifter configured to pass, and to shift by approximately a second value, signals passing between an antenna port of the second hybrid coupler and an antenna. - View Dependent Claims (16, 17, 18, 19, 20)
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21. Duplexer circuitry for cancelling undesired signals, the duplexer circuitry comprising:
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a first hybrid coupler; a second hybrid coupler; a first filter with high reflectivity (high Γ
) at transmitting frequencies (TX) and with low reflectivity (low Γ
) at receiving frequencies (RX), and configured to filter signals between the first hybrid coupler and the second hybrid coupler;a second filter with high reflectivity (high Γ
) at transmitting frequencies (TX) and with low reflectivity (low Γ
) at receiving frequencies (RX), and configured to filter additional signals between the first hybrid coupler and the second hybrid coupler;a first phase shifter configured to receive, and to shift by approximately a first value, signals passing between an isolation port of the first hybrid coupler and a tunable load; and a second phase shifter configured to pass, and to shift by approximately a second value, signals passing between an antenna port of the second hybrid coupler and an antenna. - View Dependent Claims (22, 23, 24, 25, 26)
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Specification