US 2026/0135543 A1Published application

Radio Frequency Filter With Resonators

AssigneeRichWave Technology Corp.

InventorChin-Lung Yang

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Abstract

A radio frequency filter includes a first transceiving terminal, a second transceiving terminal, a first series resonator, at least one first parallel resonator, at least one second parallel resonator, a first capacitor, a second capacitor, a first inductor, a second inductor and a third inductor. The at least one first parallel resonator is coupled in parallel with the first capacitor and couples the first series resonator to a first node. The at least one second parallel resonator is coupled in parallel with the second capacitor and couples the first series resonator to a second node. The first inductor is coupled to the first transceiving terminal. The second inductor is coupled to the second transceiving terminal. The third inductor is coupled between the first inductor and a reference node and between the second inductor and the reference node.

Claims20

Dependent claims

A radio frequency filter, comprising:

a first transceiving terminal;
a second transceiving terminal;
a first series resonator coupled between the first transceiving terminal and the second transceiving terminal;
at least one first parallel resonator, comprising a first terminal and a second terminal, wherein the first terminal of the at least one first parallel resonator is coupled to the first series resonator, and the second terminal of the at least one first parallel resonator is coupled to a first node;
at least one second parallel resonator, comprising a first terminal and a second terminal, wherein the first terminal is coupled to the first series resonator, and the second terminal of the at least one second parallel resonator is coupled to a second node;
a first capacitor, coupled in parallel with the at least one first parallel resonator;
a second capacitor, coupled in parallel with the at least one second parallel resonator;
a first inductor, comprising a first terminal and a second terminal, wherein the first terminal of the first inductor is coupled to the first transceiving terminal;
a second inductor, comprising a first terminal and a second terminal, wherein the first terminal of the second inductor is coupled to the second transceiving terminal;
and
a third inductor, comprising a first terminal and a second terminal, wherein the first terminal of the third inductor is coupled to the second terminal of the first inductor and coupled to the second terminal of the second inductor, and the second terminal of the third inductor is coupled to a reference node.

8 more elements

A radio frequency filter, comprising:

a first transceiving terminal;
a second transceiving terminal;
a first series resonator coupled between the first transceiving terminal and the second transceiving terminal;
at least one first parallel resonator, comprising a first terminal and a second terminal, wherein the first terminal of the at least one first parallel resonator is coupled to the first series resonator, and the second terminal of the at least one first parallel resonator is coupled to a first node;
at least one second parallel resonator, comprising a first terminal and a second terminal, wherein the first terminal of the at least one second parallel resonator is coupled to the first series resonator, and the second terminal of the at least one second parallel resonator is coupled to a second node;
a first inductor, comprising a first terminal and a second terminal, wherein the first terminal of the first inductor is coupled to the first transceiving terminal;
a second inductor, comprising a first terminal and a second terminal, wherein the first terminal of the second inductor is coupled to the second transceiving terminal;
and
a third inductor, comprising a first terminal and a second terminal, wherein the first terminal of the third inductor is coupled to the second terminal of the first inductor and coupled to the second terminal of the second inductor, and the second terminal of the third inductor is coupled to a reference node;
wherein the first inductor has a first inductance, the second inductor has a second inductance, and the first inductance is substantially equal to the second inductance.

7 more elements

Dependencies are inferred from the claim text.