Antenna tuner with zero volts impedance fold back
First Claim
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1. An apparatus, comprising:
- a wireless handset having transmit/receive circuitry and an antenna; and
an antenna tuner comprising a plurality of tunable capacitors and being within said wireless handset, the antenna tuner being adapted to preset its impedance to match an impedance of the transmit/receive circuitry in said handset when there is no voltage bias applied to the antenna tuner, wherein the tunable capacitors correct for impedance mismatches at the antenna when a tuning voltage is applied, and wherein the antenna tuner returns to its preset impedance when the tuning voltage is removed.
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Abstract
An embodiment of the present invention provides an apparatus, comprising a wireless handset and an antenna tuner within the wireless handset that is adapted to preset its impedance to the transmit/receive circuitry in the handset.
101 Citations
13 Claims
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1. An apparatus, comprising:
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a wireless handset having transmit/receive circuitry and an antenna; and an antenna tuner comprising a plurality of tunable capacitors and being within said wireless handset, the antenna tuner being adapted to preset its impedance to match an impedance of the transmit/receive circuitry in said handset when there is no voltage bias applied to the antenna tuner, wherein the tunable capacitors correct for impedance mismatches at the antenna when a tuning voltage is applied, and wherein the antenna tuner returns to its preset impedance when the tuning voltage is removed. - View Dependent Claims (2)
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3. An antenna tuner, comprising:
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a circuit operable in a wireless handset and comprising tunable varactors; and wherein said circuit is adapted to preset its impedance to match an impedance of the transmit/receive circuitry in said handset, the preset impedance matching the impedance of the transmit/receive circuitry in said handset when there is no bias applied to the antenna tuner, wherein the tunable varactors correct for impedance mismatches at an antenna of the handset when a tuning bias is applied, and wherein the circuit returns to its preset impedance when the tuning bias is removed. - View Dependent Claims (4, 5)
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6. A method, comprising:
using an antenna tuner within a wireless handset, said antenna tuner set to a preset impedance equal to an impedance of the transmit/receive circuitry in said handset when there is no voltage bias applied to the antenna tuner, wherein the antenna tuner has a plurality of tunable capacitors that correct for impedance mismatches at an antenna of the handset when a tuning voltage is applied, and wherein the antenna tuner returns to its preset impedance when the tuning voltage is removed. - View Dependent Claims (7)
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8. An antenna tuner, comprising:
a tunable reactance circuit configured to be operable in a wireless handset and comprising one or more elements, wherein said circuit is adapted to preset its impedance to match an impedance of the transmit/receive circuitry in said handset, the preset impedance matching the impedance of the transmit/receive circuitry in said handset when there is no bias applied to the antenna tuner, wherein the tunable reactance circuit corrects for impedance mismatches at an antenna of the handset when a tuning bias is applied, and wherein the circuit returns to its preset impedance when the tuning bias is removed. - View Dependent Claims (9, 10, 11, 12, 13)
Specification