Tunable bandpass filter and method thereof
First Claim
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1. A tunable bandpass filter comprising:
- a first resonator;
a capacitive component connected to the first resonator, wherein the capacitive component causes a notch in a frequency response of the tunable bandpass filter, and wherein the capacitive component has variable capacitance;
a second resonator connected to the capacitive component;
a first variable capacitive block comprising a first variable ferro-electric capacitor, the first variable capacitive block connected to the first resonator;
a second variable capacitive block comprising a second variable ferro-electric capacitor, the second variable capacitive block connected to the second resonator; and
,a control circuit connected to the first variable capacitive block, the second variable capacitive block, and the capacitive component, wherein the control circuit is configured to tune a passband and to vary the notch of the tunable bandpass filter.
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Abstract
The present invention provides a tunable bandpass filter and method thereof. In a preferred embodiment, the tunable bandpass filter uses variable ferro-electric capacitors to adjust both the passband and the notch across the normal operating range of a wireless communications device. The tunable bandpass filter is capable of providing a tuning range over a desired frequency range with low I.L. and high out-of-band rejections.
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Citations
9 Claims
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1. A tunable bandpass filter comprising:
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a first resonator; a capacitive component connected to the first resonator, wherein the capacitive component causes a notch in a frequency response of the tunable bandpass filter, and wherein the capacitive component has variable capacitance; a second resonator connected to the capacitive component; a first variable capacitive block comprising a first variable ferro-electric capacitor, the first variable capacitive block connected to the first resonator; a second variable capacitive block comprising a second variable ferro-electric capacitor, the second variable capacitive block connected to the second resonator; and
,a control circuit connected to the first variable capacitive block, the second variable capacitive block, and the capacitive component, wherein the control circuit is configured to tune a passband and to vary the notch of the tunable bandpass filter. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification