Enhancing isolation in radio frequency multiplexers
First Claim
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1. A radio frequency multiplexer circuit, comprising:
- a common port;
N ports, wherein N is a positive integer of at least two ports;
at least N first radio frequency filters, wherein each of the at least N first radio frequency filters is in a path connecting the common port to one of the N ports, anda set of circuit networks, wherein;
each circuit network comprises a second radio frequency filter and a radio frequency equalizer, wherein the radio frequency equalizer is configured to modify amplitude, phase, or delay responses of a signal, which is filtered by a corresponding second radio frequency filter at a frequency range of interest; and
each circuit network is in a path connecting two ports of the N ports in a configuration that enhances isolation between the two ports of the N ports.
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Abstract
A radio frequency (RF) multiplexer with isolation enhancement includes, for example, circuit networks that may be added to a set of RF filters to enhance the isolation among the ports. In one embodiment, the enhancement network may include RF filters and equalization networks. The RF multiplexer with isolation enhancement may be passive, tunable, or reconfigurable.
159 Citations
20 Claims
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1. A radio frequency multiplexer circuit, comprising:
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a common port; N ports, wherein N is a positive integer of at least two ports; at least N first radio frequency filters, wherein each of the at least N first radio frequency filters is in a path connecting the common port to one of the N ports, and a set of circuit networks, wherein; each circuit network comprises a second radio frequency filter and a radio frequency equalizer, wherein the radio frequency equalizer is configured to modify amplitude, phase, or delay responses of a signal, which is filtered by a corresponding second radio frequency filter at a frequency range of interest; and each circuit network is in a path connecting two ports of the N ports in a configuration that enhances isolation between the two ports of the N ports. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A radio frequency multiplexer circuit in support of multi antenna communication systems, comprising:
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M common ports corresponding to a plurality of M-antennas, where M is a positive integer of at least two ports; N×
M ports, where N is a positive integer of the at least two ports;at least N×
M first radio frequency filters, wherein each of the at least N×
M first radio frequency filters is in a path connecting one of the M common ports to one of the N ports; anda set of circuit networks, wherein; each circuit network comprises a second radio frequency filter and a radio frequency equalizer, wherein the radio frequency equalizer is configured to modify amplitude, phase, or delay responses of a signal, which is filtered by a corresponding second radio frequency filter at a frequency range of interest; and each circuit network is in a path connecting two ports of the N×
M ports in a configuration that enhances isolation between the two ports of the N×
M ports. - View Dependent Claims (18, 19, 20)
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Specification