Electrically tunable miniature antenna
First Claim
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1. An apparatus comprising:
- a radiator including a first radiator and a second radiator;
a first reactive circuit having a first end coupled to the radiator, the first reactive circuit having a predetermined impedance and being configured to adjust an impedance of the radiator to cause the radiator to resonate at a first frequency range;
a tuning adjuster circuit that is connected to the first end of the first reactive circuit, the tuning adjuster having an adjustable impedance and comprising a plurality of second reactive circuits, each second reactive circuit from among the plurality of second reactive circuits having a different selectable predetermined impedance to cause the radiator to resonate at a frequency that is different than the first frequency range based upon which of the plurality of second reactive circuits is selected; and
a pre-matching component configured to match a combined impedance of the first radiator and the second radiator to the first reactive circuit,wherein the first reactive circuit is coupled to the pre-matching component via a point on a transmission line that has an impedance matching that of the pre-matching component.
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Abstract
Described herein are architectures, platforms and methods for electrically tuning radiators in a portable device.
6 Citations
20 Claims
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1. An apparatus comprising:
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a radiator including a first radiator and a second radiator; a first reactive circuit having a first end coupled to the radiator, the first reactive circuit having a predetermined impedance and being configured to adjust an impedance of the radiator to cause the radiator to resonate at a first frequency range; a tuning adjuster circuit that is connected to the first end of the first reactive circuit, the tuning adjuster having an adjustable impedance and comprising a plurality of second reactive circuits, each second reactive circuit from among the plurality of second reactive circuits having a different selectable predetermined impedance to cause the radiator to resonate at a frequency that is different than the first frequency range based upon which of the plurality of second reactive circuits is selected; and a pre-matching component configured to match a combined impedance of the first radiator and the second radiator to the first reactive circuit, wherein the first reactive circuit is coupled to the pre-matching component via a point on a transmission line that has an impedance matching that of the pre-matching component. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification