High-frequency front end circuit and spurious-wave suppressing method
First Claim
1. A high-frequency front end circuit that, among a plurality of communication channels within a frequency band of a system, determines a wireless communication channel that is not used by the system on which to perform wireless communication, the high-frequency front end circuit comprising:
- a filter configured to attenuate a high-frequency signal outside the frequency band; and
a variable filter having a variable pass band and/or a variable attenuation band, wherein;
frequencies of at least one of the plurality of communication channels are within the attenuation band, the at least one communication channel being used by the system and being a channel that causes an interference wave occurring in a neighbor frequency domain that includes the wireless communication channel not used by the system, andfrequencies of the interference wave caused by the at least one communication channel and occurring in the neighbor frequency domain that includes the wireless communication channel not used by the system are within the pass band.
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Accused Products
Abstract
A high-frequency front end circuit includes a fixed frequency filter and an interference-wave suppression variable filter. The fixed frequency filter attenuates a high-frequency signal outside a specific frequency band. The interference-wave suppression variable filter attenuates a high-frequency signal in at least one used communication channel, among used communication channels that are used by a system and that causes an interference wave occurring in a neighbor frequency domain including a wireless communication channel.
5 Citations
10 Claims
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1. A high-frequency front end circuit that, among a plurality of communication channels within a frequency band of a system, determines a wireless communication channel that is not used by the system on which to perform wireless communication, the high-frequency front end circuit comprising:
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a filter configured to attenuate a high-frequency signal outside the frequency band; and a variable filter having a variable pass band and/or a variable attenuation band, wherein; frequencies of at least one of the plurality of communication channels are within the attenuation band, the at least one communication channel being used by the system and being a channel that causes an interference wave occurring in a neighbor frequency domain that includes the wireless communication channel not used by the system, and frequencies of the interference wave caused by the at least one communication channel and occurring in the neighbor frequency domain that includes the wireless communication channel not used by the system are within the pass band. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A spurious-wave suppressing method comprising:
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acquiring a plurality of communication channels within a frequency band of a system; determining a wireless communication channel from free communication channels, among the plurality of communication channels, that are not used by the system; determining whether an interference wave corresponding to a communication channel used by the system occurs in a neighbor frequency domain that includes the wireless communication channel; and adjusting attenuation characteristics of a variable filter so that frequencies of a high-frequency signal in at least one communication channel used by the system, among the communication channels causing the interference wave, are within an attenuation band of the variable filter, and so that frequencies of the interference wave are within a pass band of the variable filter, if it is determined that the interference wave occurs in the neighbor frequency domain.
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Specification