US 2011/0298560 A1Published application

High-frequency module

AssigneeMurata Manufacturing Co., Ltd.

InventorsTomoya BANDO, Kiyoshi YAMAGUCHI, Yasunori NABETANI

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Abstract

A high-frequency module enabling sufficient attenuation over a wide frequency range outside of a passband includes a triplexer including a combination of an LPF, a BPF, and HPFs arranged to demultiplex a signal input from a common terminal into a first communication signal, a second communication signal, and a third communication signal in different frequency bands, and to output the first, second, and third communication signals from individual terminals. The individual terminals of the triplexer are connected to respective baluns. The baluns are configured such that the respective passbands of the baluns overlap the respective frequency bands of the communication signals and the respective passbands of the triplexer, and the attenuation of the baluns at the attenuation poles of the triplexer is −3 dB or greater. This configuration provides high attenuation in the rebound bands of the attenuation poles.

Claims9

Dependent claims

A high-frequency module comprising:

a frequency selector provided on an unbalanced side and arranged to allow a predetermined frequency band of a communication signal to pass therethrough, the frequency selector including at least one filter circuit;
and
a balun unit arranged to perform balanced to unbalanced conversion, the balun unit being connected to a first input-output terminal of the frequency selector on the unbalanced side;
wherein
the at least one filter circuit of the frequency selector includes an attenuation pole in proximity of the predetermined frequency band of the communication signal;
in the balun unit, a passband of the balun unit includes the predetermined frequency band of the communication signal, and attenuation for the communication signal in a frequency range on a side opposite to the predetermined frequency band of the communication signal with respect to the attenuation pole increases as a frequency decreases from a frequency of the attenuation pole.

3 more elements

Dependencies are inferred from the claim text.