High efficiency ferrite antenna system
First Claim
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1. An antenna assembly for use with an FM frequency device, comprising:
- a ferrite rod;
a single turn tuning coil wound about a first portion of the ferrite rod, the single turn tuning coil operable to receive a tuning frequency and adjust the resonant frequency of the ferrite rod in response thereto; and
a multi-turn pick-up coil wound about a second portion of the ferrite rod, the multi-turn pick-up coil capable of having a voltage induced thereon by a received FM signal at the adjusted resonant frequency, the multi-turn pick-up coil being further configured to provide the received FM signal as output.
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Abstract
An automatic tuning procedure can be used to allow a small, high efficiency ferrite antenna assembly to be used in various FM frequency based devices. The ferrite antenna can take the form of a rod or flat disk, for example, which can use a pick-up coil and tuning coil to provide sufficient signal strength using a small FM antenna. A balanced amplifier can be used to provide differential input in order to further reduce noise. A microcontroller can determine the strength of the FM signal at various frequencies and can automatically tune the operating frequency to optimize system performance.
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Citations
9 Claims
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1. An antenna assembly for use with an FM frequency device, comprising:
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a ferrite rod; a single turn tuning coil wound about a first portion of the ferrite rod, the single turn tuning coil operable to receive a tuning frequency and adjust the resonant frequency of the ferrite rod in response thereto; and a multi-turn pick-up coil wound about a second portion of the ferrite rod, the multi-turn pick-up coil capable of having a voltage induced thereon by a received FM signal at the adjusted resonant frequency, the multi-turn pick-up coil being further configured to provide the received FM signal as output. - View Dependent Claims (2, 3, 4, 5)
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6. An antenna assembly for use with an FM frequency device, comprising:
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a substantially flat ferrite disk; and a pick-up coil placed around a periphery of the ferrite disk, the pick-up coil capable of having a voltage induced thereon by a received FM signal at a resonant frequency of the ferrite disk, the pick-up coil being further configured to provide the received FM signal as output. - View Dependent Claims (7, 8, 9)
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Specification