Radio frequency antenna with current controlled sensitivity
First Claim
1. A radio frequency system comprising:
- an antenna;
a receiver including a Schottky diode electrically coupled in serial relation with the antenna; and
a current supply electrically coupled to the Schottky diode and configurable to deliver a desired bias current across the Schottky diode, the Schottky diode being responsive to the bias current to realize a desired impedance across the Schottky diode such that a desired impedance match is provided between impedance of the Schottky diode and impedance of the antenna when the signal is applied across the antenna circuit, wherein reception range of the receiver is adjustable by adjusting the bias current.
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Accused Products
Abstract
An antenna circuit configured for use in a radio frequency data communications device has an antenna constructed and arranged to transfer electromagnetic waves, the electromagnetic waves corresponding to a signal carried by the antenna and generated from a signal source. A Schottky diode is electrically coupled in serial relation with the antenna, and in operation the signal is applied serially across the antenna and the diode in direct relation with electromagnetic waves transferred by the antenna. A bias current supply is also electrically coupled to the Schottky diode and is configurable to deliver a desired bias current across the current. The diode is responsive to the bias current to realize a desired diode impedance such that a desired impedance matched/mis-matched is provided between impedance of the diode and impedance of the antenna when the signal is applied across the antenna circuit, which selectively tunes the antenna circuit by imparting a desired power transfer therein. In one version, the antenna receives electromagnetic waves in the form of a radio frequency signal from a separate signal source which imparts a signal carried by the antenna to the antenna circuit such that the antenna circuit is powered by the signal. In another version, a separate signal source is provided in electrical communication with the antenna circuit such that the antenna circuit is powered by the signal source, preferably an oscillating source, which drives the antenna to produce transmitting electromagnetic waves.
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Citations
11 Claims
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1. A radio frequency system comprising:
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an antenna; a receiver including a Schottky diode electrically coupled in serial relation with the antenna; and a current supply electrically coupled to the Schottky diode and configurable to deliver a desired bias current across the Schottky diode, the Schottky diode being responsive to the bias current to realize a desired impedance across the Schottky diode such that a desired impedance match is provided between impedance of the Schottky diode and impedance of the antenna when the signal is applied across the antenna circuit, wherein reception range of the receiver is adjustable by adjusting the bias current. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An apparatus comprising:
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a package; a monolithic semiconductor integrated circuit supported by the package and having a microprocessor and integrated circuitry; and a transponder coupled to the integrated circuitry of the semiconductor integrated circuit, the transponder including an antenna circuit having an antenna, a Schottky diode serially connected to the antenna, a power supply applied serially across the antenna and the Schottky diode for respectively imparting an impedance across the antenna and the Schottky diode, and an adjustable bias current applied across the Schottky diode to realize a desired impedance of the Schottky diode in relation to impedance of the antenna; and the transponder being selectively tunable within a range of detuned and fully tuned states by way of configuring the bias current across the Schottky diode which imparts a desired signal sensitivity to the transponder. - View Dependent Claims (9, 10)
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11. An adjustable radio frequency data communication device comprising:
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a semiconductor circuit package including a microprocessor, a semiconductor integrated circuit supported by the semiconductor circuit package including a discrete semiconductor die having integrated circuitry fabricated therein; and a transponder electrically connected to the integrated circuitry within the semiconductor circuit package, the transponder including an antenna circuit having an antenna, a Schottky diode serially connected to the antenna, a signal source configured to apply a signal serially across the antenna and the diode for respectively imparting an impedance across the antenna and the diode, a bias current supply configurable to apply a desired bias current across the Schottky diode to realize a desired impedance of the Schottky diode in relation to impedance of the antenna when receiving the signal, the resulting antenna circuit realizing a desired power transfer dependent upon the ratio of antenna impedance to Schottky diode impedance; the transponder being selectively tunable within a range of detuned and fully tuned states by way of configuring the bias current across the Schottky diode to adjust the sensitivity of the transponder.
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Specification