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US 2017/0250667 A1Published application
Sub-band adjustable bandpass filter
AssigneeSamsung Electro-Mechanics Co., Ltd.
InventorSeong Jong CHEON
Life of this patent
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Abstract
A bandpass filter includes resonance circuits and an inductance circuit. The resonance circuits are coupled to variable capacitance circuits, respectively. The inductance circuit is coupled to the variable capacitance variable circuits. The resonance circuits are individually controllable by respectively connected variable capacitance circuit to resonate at different frequencies.
Claims20
A sub-band adjustable bandpass filter, comprising:
- a first resonance circuit configured to resonate at a first frequency;
- a second resonance circuit configured to resonate at a second frequency different from the first frequency;
- a first variable capacitance circuit connected between a first node connected to the first resonance circuit and a common node, the first variable capacitance circuit having a capacitance value being varied responsive to a first control signal;
- a second variable capacitance circuit connected between a second node connected to the second resonance circuit and the common node, the second variable capacitance circuit having a capacitance value being varied responsive to a second control signal;
- and
- an inductance circuit, the inductance circuit and the first variable capacitance circuit defining a first parallel resonance circuit, the inductance circuit and the second variable capacitance circuit defining a second parallel resonance circuit, the inductance circuit and the first variable capacitance circuit defining a first series resonance circuit, and the inductance circuit and the second variable capacitance circuit defining a second series resonance circuit.
3 more elements
A sub-band adjustable bandpass filter, comprising:
- a first resonance circuit configured to resonate at a first frequency;
- a second resonance circuit configured to resonate at a second frequency different from the first frequency;
- a first variable capacitance circuit connected between a first node connected to the first resonance circuit and a common node, the first variable capacitance circuit having a capacitance value being varied responsive to a first control signal;
- a second variable capacitance circuit connected between a second node connected to the second resonance circuit and the common node, the second variable capacitance circuit having a capacitance value being varied responsive to a second control signal;
- and
- an inductance circuit including a first inductor, a second inductor, and a common inductor connected between the common node and a ground,
- the first inductor and the first variable capacitance circuit defining a first parallel resonance circuit, the second inductor and the second variable capacitance circuit defining a second parallel resonance circuit, the common inductor and the first variable capacitance circuit defining a first series resonance circuit, and the common inductor and the second variable capacitance circuit defining a second series resonance circuit,
- wherein the first inductor and the second inductor form inductive coupling.
5 more elements
A bandpass filter, comprising:
- resonance circuits coupled to variable capacitance circuits, respectively;
- and
- an inductance circuit coupled to the variable capacitance variable circuits, the resonance circuits being individually controllable by respectively coupled variable capacitance circuit to resonate at different predetermined frequencies.
Dependencies are inferred from the claim text.