US 2026/0074718 A1Published application

Radio frequency circuit

AssigneeMurata Manufacturing Co., Ltd.

InventorsHirotsugu MORI, Atsushi HORITA

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Abstract

A radio frequency circuit includes: a first filter having a passband including uplink bands of first and second bands (UL1,UL2); a second filter having a passband including a downlink band of the first band (DL1); and a downlink filter arrangement that filters a downlink band of the second band (DL2) and a downlink band of a third band (DL3). All filter paths are ultimately communicatively coupled to an antenna terminal, either directly or via a switch. The combination of the first and second bands is a band combination for simultaneous communication. The frequency ordering is DL2>DL3>UL2>UL1>DL1. The first filter has a steeper attenuation slope on a higher frequency side than on a lower frequency side of the passband.

Claims20

Dependent claims

A radio frequency circuit comprising:

a first filter having a passband that includes an uplink band of a first band and an uplink band of a second band;
a second filter having a passband that includes a downlink band of the first band;
a third filter having a passband that includes a downlink band of the second band;
a fourth filter having a passband that includes a downlink band of a third band;
and
a switch that includes a first terminal connected to a first antenna connection terminal, a second terminal connected to the first filter, the second filter, and the third filter, and a third terminal connected to the fourth filter, wherein
a combination of the first band and the second band is a band combination for simultaneous communication,
the uplink band of the first band is higher than the downlink band of the first band,
the uplink band of the second band is higher than the uplink band of the first band,
the downlink band of the second band is higher than the uplink band of the second band,
the downlink band of the third band is higher than the uplink band of the second band and lower than the downlink band of the second band, and
the first filter has a steeper attenuation slope on a higher frequency side of the passband than on a lower frequency side of the passband.

9 more elements

A radio frequency circuit comprising:

a first filter adjustable to a first passband that includes an uplink band of a first band and an uplink band of a second band, and a second passband that includes the uplink band of the first band and is narrower than the first passband;
a second filter having a passband that includes a downlink band of the first band;
a third filter having a passband that includes a downlink band of the second band;
a fourth filter having a passband that includes a downlink band of a third band;
and
a switch that includes a first terminal connected to an antenna connection terminal, a second terminal connected to the first filter and the second filter, a third terminal connected to the third filter, and a fourth terminal connected to the fourth filter, wherein
a combination of the first band and the second band is a band combination for simultaneous communication,
the uplink band of the first band is higher than the downlink band of the first band,
the uplink band of the second band is higher than the uplink band of the first band,
the downlink band of the second band is higher than the uplink band of the second band,
the downlink band of the third band is higher than the uplink band of the second band and lower than the downlink band of the second band, and
the first filter has a steeper attenuation slope on a higher frequency side of the first passband than on a lower frequency side of the first passband.

9 more elements

A radio frequency circuit comprising:

a first filter adjustable to a first passband that includes an uplink band of a first band and an uplink band of a second band, and a second passband that includes the uplink band of the first band and is narrower than the first passband;
a second filter having a passband that includes a downlink band of the first band;
a third filter adjustable to a third passband that includes a downlink band of the second band and a downlink band of a third band, and a fourth passband that includes the downlink band of the second band and is narrower than the third passband, wherein
the first filter, the second filter, and the third filter are connected to a common antenna connection terminal,
a combination of the first band and the second band is a band combination for simultaneous communication,
the uplink band of the first band is higher than the downlink band of the first band,
the uplink band of the second band is higher than the uplink band of the first band,
the downlink band of the second band is higher than the uplink band of the second band,
the downlink band of the third band is higher than the uplink band of the second band and lower than the downlink band of the second band, and
the first filter has a steeper attenuation slope on a higher frequency side of the first passband than on a lower frequency side of the first passband.

7 more elements

Dependencies are inferred from the claim text.

Facts

Application: 19/387,950Filed 13 Nov 2025
Priority: JP 2023-08188817 May 2023
Published: 12 Mar 2026
Term ends: Not estimatedThe source records don’t support an estimate.

Classification10 codes

H04B 1/006
With common antenna for more than one band: using switches for selecting the desired band
H03H 9/17
Constructional features of resonators consisting of piezoelectric or electrostrictive material: having a single resonator
H03H 9/54
Filters: comprising resonators of piezoelectric or electrostrictive material
H03H 9/64
Filters: using surface acoustic waves

Family

Application19/387,950Continuation
US 2026/0074718 A1This patent

From the US filing history. Foreign family members aren’t listed.

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