US 2015/0091666 A1Published application

Transmission module

AssigneeMurata Manufacturing Co., Ltd.

InventorsYuki Higashide, Syunji Yoshimi, Kenji Saito

Life of this patent

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Abstract

As a capacitor Cj is connected in parallel to a non-reciprocal circuit 3, in a predetermined frequency band in which a power amplifier 2 is used, or in other words, in a predetermined frequency band used in communication, an input impedance of the non-reciprocal circuit 3 is adjusted and the length of an impedance curve (reflection coefficient S11) at an input terminal P2 of the non-reciprocal circuit 3 can thus be reduced. In addition, an output impedance of the power amplifier 2 and an input impedance of the non-reciprocal circuit 3 can be matched in a broad band through an interstage matching circuit 7 (input matching circuit 6) provided between an output terminal P1 of the power amplifier 2 and the input terminal P2 of the non-reciprocal circuit 3.

Claims15

Dependent claims

A transmission module comprising an amplifier circuit and a non-reciprocal circuit,

wherein the non-reciprocal circuit includes
an isolator provided with an input port and an output port,
a broadband circuit disposed between the input port and the output port of the isolator, the broadband circuit being connected in parallel to the isolator, and
an output matching circuit connected in series to the output port of the isolator,
wherein the isolator includes
a microwave magnetic body,
a first center electrode and a second center electrode disposed on the microwave magnetic body in a state in which the first center electrode and the second center electrode are isolated from each other while intersecting with each other, and
permanent magnets configured to apply a direct current magnetic field to a portion where the first center electrode and the second center electrode intersect with each other,
wherein the first center electrode is connected at one end to an input end of the non-reciprocal circuit and connected at another end to an input end of the output matching circuit,
wherein the second center electrode is connected at one end to the input end of the non-reciprocal circuit and grounded at another end,
wherein the broadband circuit includes
a first capacitor connected in parallel to the first center electrode, and
a series circuit connected in parallel to the first center electrode, the series circuit being formed by a terminator and an LC series resonant circuit, and
wherein a second capacitor is connected in parallel to the non-reciprocal circuit.

11 more elements

A transmission module comprising an amplifier circuit and a non-reciprocal circuit,

wherein the non-reciprocal circuit includes
an isolator provided with an input port and an output port,
a broadband circuit disposed between the input port and the output port of the isolator, the broadband circuit being connected in parallel to the isolator, and
an output matching circuit connected in series to the output port of the isolator,
wherein the isolator includes
a microwave magnetic body,
a first center electrode and a second center electrode disposed on the microwave magnetic body in a state in which the first center electrode and the second center electrode are isolated from each other while intersecting with each other, and
permanent magnets configured to apply a direct current magnetic field to a portion where the first center electrode and the second center electrode intersect with each other,
wherein the first center electrode is connected at one end to an input end of the non-reciprocal circuit and connected at another end to an input end of the output matching circuit,
wherein the second center electrode is connected at one end to the input end of the output matching circuit and grounded at another end,
wherein the broadband circuit includes
a first capacitor connected in parallel to the first center electrode, and
a series circuit connected in parallel to the first center electrode, the series circuit being formed by a terminator and an LC series resonant circuit, and
wherein a second capacitor is connected in parallel to the non-reciprocal circuit.

11 more elements

Dependencies are inferred from the claim text.

Facts

Application: 14/561,342Filed 5 Dec 2014
Priority: JP 2012-16077719 Jul 2012
Published: 2 Apr 2015
Term ends: Not estimatedThe source records don’t support an estimate.

Classification8 codes

H03H 7/12
Frequency selective two-port networks: bandpass or bandstop filters with adjustable bandwidth and fixed centre frequency
H01P 1/36
Non-reciprocal transmission devices: isolators
H03H 7/38
Multiple-port networks comprising only passive electrical elements as network components: impedance-matching networks
H03H 7/52
Multiple-port networks comprising only passive electrical elements as network components: one-way transmission networks, i.e. unilines