High linearity RF diplexer
First Claim
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1. An apparatus comprising:
- a first hybrid RF coupler having a first main port, a first in-phase port, a first quadrature-phase port, and a first isolation port, which is coupled to a primary RF antenna, wherein the first hybrid RF coupler is configured to receive an RF transmit signal via the first main port to provide an RF antenna transmit signal via the first isolation port;
a second hybrid RF coupler having a second main port, a second in-phase port, a second quadrature-phase port, and a second isolation port;
a first RF filter coupled between the first in-phase port and the second in-phase port; and
a second RF filter coupled between the first quadrature-phase port and the second quadrature-phase port, wherein the first hybrid RF coupler, the second hybrid RF coupler, the first RF filter, and the second RF filter form a first RF diplexer, wherein;
a filter response of the first RF filter to RF signals received from the first in-phase port is approximately equal to a filter response of the first RF filter to RF signals received from the second in-phase port, such that the first RF filter has an approximately symmetrical filter response; and
a filter response of the second RF filter to RF signals received from the first quadrature-phase port is approximately equal to a filter response of the second RF filter to RF signals received from the second quadrature-phase port, such that the second RF filter has an approximately symmetrical filter response.
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Abstract
A first RF diplexer, which includes a first hybrid RF coupler, a second hybrid RF coupler, a first RF filter, and a second RF filter, is disclosed. The first hybrid RF coupler has a first main port, a first in-phase port, a first quadrature-phase port, and a first isolation port, which is coupled to a primary RF antenna. The second hybrid RF coupler has a second main port, a second in-phase port, and a second quadrature-phase port. The first RF filter is coupled between the first in-phase port and the second in-phase port. The second RF filter is coupled between the first quadrature-phase port and the second quadrature-phase port.
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Citations
26 Claims
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1. An apparatus comprising:
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a first hybrid RF coupler having a first main port, a first in-phase port, a first quadrature-phase port, and a first isolation port, which is coupled to a primary RF antenna, wherein the first hybrid RF coupler is configured to receive an RF transmit signal via the first main port to provide an RF antenna transmit signal via the first isolation port; a second hybrid RF coupler having a second main port, a second in-phase port, a second quadrature-phase port, and a second isolation port; a first RF filter coupled between the first in-phase port and the second in-phase port; and a second RF filter coupled between the first quadrature-phase port and the second quadrature-phase port, wherein the first hybrid RF coupler, the second hybrid RF coupler, the first RF filter, and the second RF filter form a first RF diplexer, wherein; a filter response of the first RF filter to RF signals received from the first in-phase port is approximately equal to a filter response of the first RF filter to RF signals received from the second in-phase port, such that the first RF filter has an approximately symmetrical filter response; and a filter response of the second RF filter to RF signals received from the first quadrature-phase port is approximately equal to a filter response of the second RF filter to RF signals received from the second quadrature-phase port, such that the second RF filter has an approximately symmetrical filter response. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. An apparatus comprising:
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a first hybrid RF coupler having a first main port, a first in-phase port, a first quadrature-phase port, and a first isolation port, which is coupled to a primary RF antenna, wherein the first hybrid RF coupler is configured to receive an RF transmit signal via the first main port to provide an RF antenna transmit signal via the first isolation port; a second hybrid RF coupler having a second main port, a second in-phase port, a second quadrature-phase port, and a second isolation port; a first RF filter coupled between the first in-phase port and the second in-phase port; and a second RF filter coupled between the first quadrature-phase port and the second quadrature-phase port, wherein the first hybrid RF coupler, the second hybrid RF coupler, the first RF filter, and the second RF filter form a first RF diplexer, wherein the first hybrid RF coupler and the second hybrid RF coupler are further configured to substantially reduce third order mixing effects produced by the first RF filter and the second RF filter.
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20. An apparatus comprising:
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a first hybrid RF coupler having a first main port, a first in-phase port, a first quadrature-phase port, and a first isolation port, which is coupled to a primary RF antenna, wherein the first hybrid RF coupler is configured to receive an RF transmit signal via the first main port to provide an RF antenna transmit signal via the first isolation port; a second hybrid RF coupler having a second main port, a second in-phase port, a second quadrature-phase port, and a second isolation port; a first RF filter coupled between the first in-phase port and the second in-phase port; and a second RF filter coupled between the first quadrature-phase port and the second quadrature-phase port, wherein the first hybrid RF coupler, the second hybrid RF coupler, the first RF filter, and the second RF filter form a first RF diplexer configured to; receive, split, phase-shift, filter, phase-shift, and combine a lowband RF antenna receive signal via the first isolation port to provide a lowband RF receive signal via the second main port; receive, split, phase-shift, reflect, phase-shift, and combine a highband RF antenna receive signal via the first isolation port to provide a highband RF receive signal via the first main port; and receive the lowband RF antenna receive signal and the highband RF antenna receive signal simultaneously, such that the lowband RF antenna receive signal and the highband RF antenna receive signal are Receive Downlink Carrier Aggregation signals. - View Dependent Claims (21, 22, 23, 24, 25, 26)
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Specification