Low-pass filter
First Claim
Patent Images
1. A low-pass filter comprising:
- a first input/output port;
a second input/output port;
a first LC parallel resonator and a second LC parallel resonator connected in series and provided between the first input/output port and the second input/output port;
a first path;
a second paths; and
a third path, whereinthe first LC parallel resonator has a plurality of ends including a first end, the first end being closest to the first input/output port in circuit configuration as compared to all other ones of the plurality of ends of the first LC parallel resonator,the second LC parallel resonator has a plurality of ends including a second end, the second end being closest to the second input/output port in circuit configuration as compared to all other ones of the plurality of ends of the second LC parallel resonator,the first path includes a first LC series resonator and connects the first end to a ground,the second path includes a second LC series resonator and connects the second end to the ground,the third path includes a third-path capacitor and connects a connection point between the first and second LC parallel resonators to the ground, andthe third path has an inductance lower than an inductance of each of the first path and the second path, the inductance of the third path being 30% or less of the inductance of the first path and 30% or less of the inductance of the second path.
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Abstract
A low-pass filter includes first and second input/output ports, first and second LC parallel resonators connected in series and provided between the first and second input/output ports, and first to third paths. The first path includes a first LC series resonator and connects a first end of the first LC parallel resonator closest to the first input/output port to a ground. The second path includes a second LC series resonator and connects a second end of the second LC parallel resonator closest to the second input/output port to the ground. The third path includes a third-path capacitor and connects a connection point between the first and second LC parallel resonators to the ground.
3 Citations
5 Claims
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1. A low-pass filter comprising:
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a first input/output port; a second input/output port; a first LC parallel resonator and a second LC parallel resonator connected in series and provided between the first input/output port and the second input/output port; a first path; a second paths; and a third path, wherein the first LC parallel resonator has a plurality of ends including a first end, the first end being closest to the first input/output port in circuit configuration as compared to all other ones of the plurality of ends of the first LC parallel resonator, the second LC parallel resonator has a plurality of ends including a second end, the second end being closest to the second input/output port in circuit configuration as compared to all other ones of the plurality of ends of the second LC parallel resonator, the first path includes a first LC series resonator and connects the first end to a ground, the second path includes a second LC series resonator and connects the second end to the ground, the third path includes a third-path capacitor and connects a connection point between the first and second LC parallel resonators to the ground, and the third path has an inductance lower than an inductance of each of the first path and the second path, the inductance of the third path being 30% or less of the inductance of the first path and 30% or less of the inductance of the second path.
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2. A low-pass filter comprising:
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a first input/output port; a second input/output port; a first LC parallel resonator and a second LC parallel resonator connected in series and provided between the first input/output port and the second input/output port; a first path; a second path; and a third path, wherein the first LC parallel resonator has a plurality of ends including a first end, the first end being closest to the first input/output port in circuit configuration as compared to all other ones of the plurality of ends of the first LC parallel resonator, the second LC parallel resonator has a plurality of ends including a second end, the second end being closest to the second input/output port in circuit configuration as compared to all other ones of the plurality of ends of the second LC parallel resonator, the first path includes a first LC series resonator and connects the first end to a ground, the second path includes a second LC series resonator and connects the second end to the ground, the third path includes a third-path capacitor and connects a connection point between the first and second LC parallel resonators to the ground, the third path has an inductance lower than an inductance of each of the first path and the second path, and the first LC series resonator and the second LC series resonator include a common inductor or a common capacitor.
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3. A low-pass filter comprising:
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a first input/output port; a second input/output port; a first LC parallel resonator and a second LC parallel resonator connected in series and provided between the first input/output port and the second input/output port; a first path; a second path; a third path; a multilayer stack for integrating the first and second input/output ports, the first and second LC parallel resonators and the first to third paths, the multilayer stack including a plurality of dielectric lavers stacked to be aligned in a first direction, the multilayer stack having a first end face and a second end face located at opposite ends in the first direction; and a ground terminal provided on the first end face of the multilayer stack and connected to the third path, wherein the first LC parallel resonator has a plurality of ends including a first end, the first end being closest to the first input/output port in circuit configuration as compared to all other ones of the plurality of ends of the first LC parallel resonator, the second LC parallel resonator has a plurality of ends including a second end, the second end being closest to the second input/output port in circuit configuration as compared to all other ones of the plurality of ends of the second LC parallel resonator, the first path includes a first LC series resonator and connects the first end to a ground, the second path includes a second LC series resonator and connects the second end to the ground, the third path include, a third-path capacitor and connects a connection point between the first and second LC parallel resonators to the ground, the third path has an inductance lower than an inductance of each of the first path and the second path, and a physical connection corresponding to the connection point between the first and second LC parallel resonators, the third-path capacitor, and the ground terminal are arranged to intersect or contact one imaginary straight line extending in the first direction. - View Dependent Claims (4, 5)
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Specification