System and method for dual-band antenna matching
First Claim
1. A dual-band antenna system for wireless communication of signals in a plurality of communication bands, the system comprising:
- an antenna having an interface port with a frequency-dependent impedance; and
,a dual-band matching circuit including an output port connected to the antenna interface port, the dual-band matching circuit comprising;
a first tuning circuit selectively tunable within a first communication band of the plurality of communication bands and selectively tunable within a third communication band of the plurality of communication bands, the first tuning circuit comprising a first tunable ferroeclectric (FE) capacitor having a first variable dielectric constant responsive to first control voltage; and
a second tuning circuit selectively tunable within a second communication band of the plurality of communication bands when the first tuning circuit is tuned to the first communication band and selectively tunable within a fourth communication band of the plurality of communication bands when the first tuning circuit is tuned to the third communication band, the second tuning circuit comprising a second tunable FE capacitor having a second variable dielectric constant responsive to a second control voltage;
wherein the first tuning circuit and the second tuning circuit supply a first conjugate impedance for the first and second communication bands and supply a second conjugate impedance for the third and fourth communication bands.
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Accused Products
Abstract
A dual-band antenna matching system and a method for dual-band impedance matching are provided. The method comprises: accepting a frequency-dependent impedance from an antenna; and, selectively supplying a conjugate impedance match for the antenna at either a first and a second communication band, or a third and a fourth communication band. More specifically, the method comprises: tuning a first tuning circuit to a first frequency; and, simultaneously tuning a second tuning circuit to a second frequency. In response, a conjugate match is supplied to the antenna in the first communication band in response to the first frequency. Simultaneously, the antenna is matched in the second communication band in response to the second frequency. When the first tuning circuit is tuned to a third frequency, and the second tuning circuit is tuned to a fourth frequency, then conjugate matches are supplied for the third and fourth communication bands, responsive to the third and fourth frequencies, respectively.
520 Citations
24 Claims
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1. A dual-band antenna system for wireless communication of signals in a plurality of communication bands, the system comprising:
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an antenna having an interface port with a frequency-dependent impedance; and
,a dual-band matching circuit including an output port connected to the antenna interface port, the dual-band matching circuit comprising; a first tuning circuit selectively tunable within a first communication band of the plurality of communication bands and selectively tunable within a third communication band of the plurality of communication bands, the first tuning circuit comprising a first tunable ferroeclectric (FE) capacitor having a first variable dielectric constant responsive to first control voltage; and a second tuning circuit selectively tunable within a second communication band of the plurality of communication bands when the first tuning circuit is tuned to the first communication band and selectively tunable within a fourth communication band of the plurality of communication bands when the first tuning circuit is tuned to the third communication band, the second tuning circuit comprising a second tunable FE capacitor having a second variable dielectric constant responsive to a second control voltage; wherein the first tuning circuit and the second tuning circuit supply a first conjugate impedance for the first and second communication bands and supply a second conjugate impedance for the third and fourth communication bands. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A wireless communications device with a dual-band antenna matching system, the device comprising:
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a transceiver having a wireless communications port to communicate in a first, a second, a third, and a fourth communication band; an antenna having an interface port with a frequency-dependent impedance; a dual-band matching circuit including an input port connected to the transceiver wireless communications port and an output port connected to the antenna interface port, the dual-band matching circuit selectively supplying a first conjugate impedance for the first and a second communication band and a second conjugate impedance for the third and a fourth communication band, the dual-band matching circuit comprising; a first tuning circuit selectively tunable within the first and third communication bands utilizing a first ferroelectric (FE) capacitor responsive to a first control voltage; and a second tuning circuit selectively tunable within the second and fourth communication bands utilizing a second ferroelectric (FE) capacitor responsive to a second control voltage. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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Specification