Multiplexer, radio frequency front-end circuit, and communication device
First Claim
Patent Images
1. A multiplexer comprising:
- a first 90°
hybrid coupler that is connected to an antenna terminal, that includes a plurality of transmission lines, and that is configured to shift, with respect to a radio frequency signal passing through one of the plurality of transmission lines of the first 90°
hybrid coupler, a phase of a radio frequency signal passing through another of the plurality of transmission lines of the first 90°
hybrid coupler by approximately 90 degrees;
a second 90°
hybrid coupler that is connected to a terminating resistor, that includes a plurality of transmission lines, and that is configured to shift, with respect to a radio frequency signal passing through one of the plurality of transmission lines of the second 90°
hybrid coupler, a phase of a radio frequency signal passing through another of the plurality of transmission lines of the second 90°
hybrid coupler by approximately 90 degrees;
a first filter connected to the first 90°
hybrid coupler and configured to selectively pass a first radio frequency signal of a first pass band; and
a second filter and a third filter, the second and third filters both being connected to both the first 90°
hybrid coupler and the second 90°
hybrid coupler, and both having the same filter characteristics,wherein the second filter and the third filter are band elimination filters configured to reflect the first radio frequency signal and pass a second radio frequency signal of a band other than the first pass band, low-pass filters configured to reflect a third radio frequency signal of a band including the first pass band and pass a fourth radio frequency signal of a band lower than the band of the third radio frequency signal, or high-pass filters configured to reflect a fifth radio frequency signal of a low frequency band including the first pass band and pass a sixth radio frequency signal of a band higher than the band of the fifth radio frequency signal.
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Abstract
A duplexer includes a 90° hybrid connected to an antenna terminal, a 90° hybrid connected to a terminating resistor, a transmission-side filter connected to the 90° hybrid connected to the antenna terminal, and notch filters connected to both of the 90° hybrids and mutually having the same filter characteristics, where each of the notch filters is a band elimination filter configured to reflect a radio frequency signal of a transmission band and allow a radio frequency signal of a band other than the transmission band to pass through.
36 Citations
20 Claims
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1. A multiplexer comprising:
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a first 90°
hybrid coupler that is connected to an antenna terminal, that includes a plurality of transmission lines, and that is configured to shift, with respect to a radio frequency signal passing through one of the plurality of transmission lines of the first 90°
hybrid coupler, a phase of a radio frequency signal passing through another of the plurality of transmission lines of the first 90°
hybrid coupler by approximately 90 degrees;a second 90°
hybrid coupler that is connected to a terminating resistor, that includes a plurality of transmission lines, and that is configured to shift, with respect to a radio frequency signal passing through one of the plurality of transmission lines of the second 90°
hybrid coupler, a phase of a radio frequency signal passing through another of the plurality of transmission lines of the second 90°
hybrid coupler by approximately 90 degrees;a first filter connected to the first 90°
hybrid coupler and configured to selectively pass a first radio frequency signal of a first pass band; anda second filter and a third filter, the second and third filters both being connected to both the first 90°
hybrid coupler and the second 90°
hybrid coupler, and both having the same filter characteristics,wherein the second filter and the third filter are band elimination filters configured to reflect the first radio frequency signal and pass a second radio frequency signal of a band other than the first pass band, low-pass filters configured to reflect a third radio frequency signal of a band including the first pass band and pass a fourth radio frequency signal of a band lower than the band of the third radio frequency signal, or high-pass filters configured to reflect a fifth radio frequency signal of a low frequency band including the first pass band and pass a sixth radio frequency signal of a band higher than the band of the fifth radio frequency signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification