Dynamically adjustable narrow bandwidth antenna for wide band systems
First Claim
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1. A receiver, comprising:
- a dynamically adjustable antenna having a narrow natural bandwidth delineated by a first frequency range and coupled to receive a radio frequency signal within a narrow bandwidth of interest delineated by a second frequency range different from said first frequency range;
a tuning circuit coupled to said antenna to controllably move an effective bandwidth of said antenna from said narrow natural bandwidth to said narrow bandwidth of interest and to tune said antenna to a center frequency associated with said radio frequency signal within said narrow bandwidth of interest;
a low noise amplifier coupled to amplify said radio frequency signal and to produce an amplified signal;
a received signal strength indicator coupled to measure a signal strength of said amplified signal and to produce signal strength measurements indicative of said signal strength; and
a processor operable to select said center frequency within said bandwidth of interest from a wide band spectrum over which said receiver operates and coupled to adjust said tuning circuit based on said signal strength measurements.
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Abstract
The effective bandwidth of a dynamically adjustable antenna with a narrow natural bandwidth delineated by a first frequency change can be moved from the natural bandwidth to another narrow bandwidth of interest within a wide band spectrum using a tuning circuit. The tuning circuit controllably changes an effective impedance of the antenna to tune the antenna to the bandwidth of interest. During operation, the signal strength of a received signal within the bandwidth of interest is measured, and the resulting signal strength measurements are used by a processor to adjust the tuning circuit, thereby tuning the antenna to a desired center frequency within the bandwidth of interest.
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Citations
26 Claims
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1. A receiver, comprising:
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a dynamically adjustable antenna having a narrow natural bandwidth delineated by a first frequency range and coupled to receive a radio frequency signal within a narrow bandwidth of interest delineated by a second frequency range different from said first frequency range; a tuning circuit coupled to said antenna to controllably move an effective bandwidth of said antenna from said narrow natural bandwidth to said narrow bandwidth of interest and to tune said antenna to a center frequency associated with said radio frequency signal within said narrow bandwidth of interest; a low noise amplifier coupled to amplify said radio frequency signal and to produce an amplified signal; a received signal strength indicator coupled to measure a signal strength of said amplified signal and to produce signal strength measurements indicative of said signal strength; and a processor operable to select said center frequency within said bandwidth of interest from a wide band spectrum over which said receiver operates and coupled to adjust said tuning circuit based on said signal strength measurements. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A method for dynamically adjusting an effective bandwidth of an antenna to cover a wide band spectrum, said antenna having a narrow natural bandwidth delineated by a first frequency range, said method comprising:
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selecting a center frequency within a narrow bandwidth of interest within said wide band spectrum; controllably moving said effective bandwidth of said antenna from said narrow natural bandwidth to said narrow bandwidth of interest, said narrow bandwidth of interest having a second frequency range different from said first frequency range; receiving at said antenna a radio frequency signal within said bandwidth of interest; amplifying said radio frequency signal to produce an amplified signal; measuring a signal strength of said amplified signal to produce signal strength measurements indicative of said signal strength; and repeating said controllably moving said effective bandwidth of said antenna based on said signal strength measurements to tune said antenna to said center frequency within said bandwidth of interest. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25, 26)
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Specification