System for automatically tuning the antenna of a miniature portable communications device
First Claim
1. An antenna tuning apparatus for a portable communications device, the device including means for adapting the device to be worn on the body, and having a receiver for receiving transmitted signals including at least one tuning mode signal, said apparatus comprising:
- antenna means for intercepting the transmitted signals;
antenna tuning means coupled to said antenna means for tuning the same;
receiver means, responsive to said antenna means, for receiving the transmitted signals to derive a carrier monitor signal, said receiver means further demodulating the transmitted signals to recover the tuning mode signal;
decoder means, responsive to the tuning mode signal, for generating a tuning mode detection signal;
carrier detection means, responsive to the carrier monitor signal, for generating a carrier magnitude signal;
tuning controller means, responsive to the tuning mode detection signal, for generating a tuning enable signal which is supplied to said carrier detection means for enabling the same;
said tuning controller means, further responsive to the carrier magnitude signal, for generating a tuning control signal; and
converter means, responsive to the tuning control signal, for generating a tuning control voltage, the tuning control voltage being supplied to said antenna tuning means for effecting the tuning of said antenna means.
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Accused Products
Abstract
An antenna tuning apparatus for a portable communications device which includes a means of adapting the device to be worn on the body is described. The device consists of an antenna, tuning means and a receiver for receiving transmitted signals including a tuning mode signal. A decoder initiates antenna tuning when the tuning mode signal is detected. A tuning controller enables a carrier detection circuit to determine the magnitude of the received signals, and generates a tuning control signal supplied to a D/A converter to effect tuning of the antenna by monitoring the variations in the magnitude of the received signals.
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Citations
36 Claims
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1. An antenna tuning apparatus for a portable communications device, the device including means for adapting the device to be worn on the body, and having a receiver for receiving transmitted signals including at least one tuning mode signal, said apparatus comprising:
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antenna means for intercepting the transmitted signals; antenna tuning means coupled to said antenna means for tuning the same; receiver means, responsive to said antenna means, for receiving the transmitted signals to derive a carrier monitor signal, said receiver means further demodulating the transmitted signals to recover the tuning mode signal; decoder means, responsive to the tuning mode signal, for generating a tuning mode detection signal; carrier detection means, responsive to the carrier monitor signal, for generating a carrier magnitude signal; tuning controller means, responsive to the tuning mode detection signal, for generating a tuning enable signal which is supplied to said carrier detection means for enabling the same; said tuning controller means, further responsive to the carrier magnitude signal, for generating a tuning control signal; and converter means, responsive to the tuning control signal, for generating a tuning control voltage, the tuning control voltage being supplied to said antenna tuning means for effecting the tuning of said antenna means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. An antenna tuning apparatus for a portable communications device, the device including means for adapting the device to be worn on the body, and having a receiver for receiving transmitted signals, including selective call signals, and at least one tuning mode signal, said apparatus comprising:
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antenna means for intercepting the transmitted signals; antenna tuning means coupled to said antenna means for tuning the same; receiver means, responsive to said antenna means, for receiving the transmitted signals to derive a carrier monitor signal, said receiver means further demodulating the transmitted signals to recover the selective call signals and the tuning mode signal; identification means for storing predetermined identification information; decoder means, responsive to the selective call signals, for generating a first control signal when one of the selective call signals matches the predetermined identification information; said decoder means, further responsive to the tuning mode signal, for generating a tuning mode detection signal when the tuning mode signal is decoded immediately after the first control signal is generated; carrier detection means, responsive to the carrier monitor signal, for generating a carrier magnitude signal; and tuning controller means, responsive to the tuning mode detection signal, for generating a tuning enable signal, the tuning enable signal supplied to said carrier detection means for enabling the same; said tuning controller means, further responsive to the carrier magnitude signal, for generating a tuning control signal; and converter means, responsive to the tuning control signal, for generating a tuning control voltage, the tuning control voltage being supplied to said antenna tuning means for effecting the tuning of said antenna means. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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19. An antenna tuning apparatus for a portable communications device, the device including means for adapting the device to be worn on the body, and having a receiver for receiving transmitted signals including at least one tuning mode signal, said apparatus comprising:
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antenna means for intercepting the transmitted signals; antenna tuning means coupled to said antenna means for tuning the same; receiver means, coupled to said antenna means, for receiving the transmitted signals to derive a carrier monitor signal, said receiver means further demodulating the transmitted signals to recover the tuning mode signal; carrier detection means, responsive to the carrier monitor signal, for generating a carrier magnitude signal; a microcomputer, coupled to said receiver means and to said carrier detection means, and responsive to the tuning mode signal for generating a tuning enable signal which is supplied to said carrier detection means for enabling the same, said microcomputer being further responsive to the carrier magnitude signal, for generating a tuning control signal; and converter means, coupled to said microcomputer and responsive to the tuning control signal, for generating a tuning control voltage, the tuning control voltage being supplied to said antenna tuning means for effecting the tuning of said antenna means. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26, 27)
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28. An antenna tuning apparatus for a portable communications device, the device including means for adapting the device to be worn on the body, and having a receiver for receiving transmitted signals, including selective call signals, and at least one tuning mode signal, said apparatus comprising:
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antenna means for intercepting the transmitted signals; antenna tuning means coupled to said antenna means for tuning the same; receiver means, coupled to said antenna means, for receiving the transmitted signals to derive a carrier monitor signal, said receiver means further demodulating the transmitted signals to recover the selective call signals and the tuning mode signal; identification means, for storing predetermined identification information; carrier detection means, responsive to the carrier monitor signal, for generating a carrier magnitude signal; a microcomputer, coupled to said receiver means, to said carrier detection means and to said identification means, and responsive to the tuning mode signal following a selective call signal matching the predetermined identification information, said microcomputer means, generating a tuning enable signal which is supplied to said carrier detection means for enabling the same, said microcomputer being further responsive to the carrier magnitude signal, for generating a tuning control signal; and converter means, coupled to said microcomputer and responsive to the tuning control signal, for generating a tuning control voltage, the tuning control voltage being supplied to said antenna tuning means for effecting the tuning of said antenna means. - View Dependent Claims (29, 30, 31, 32, 33, 34, 35, 36)
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Specification