Impedance matching arrangement
First Claim
Patent Images
1. An impedance matching arrangement including signal processing means tunable to a selected one of a plurality of frequencies and operative in a mode in which certain of the frequencies occur repetitively, coupled to a frequency dependent impedance;
- impedance compensation means adapted to present to said signal processing means compensation for the impedance variation of said frequency dependent impedance; and
means responsive to an impedance mismatch at a particular frequency for controlling the characteristics of said impedance compensation means when said particular frequency recurs so as to reduce said mismatch.
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Abstract
An impedance matching arrangement is suitable for use with a frequency hopping radio communications system which is operable over a wide frequency band, so as to match the operating impedance of the antenna at each of the frequencies used. As the frequency of the radio system hops from one frequency to another, a note of any impedance mismatch is noted and data derived therefrom is stored for future use when that frequency is next selected so as to reduce any impedance mismatch.
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Citations
17 Claims
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1. An impedance matching arrangement including signal processing means tunable to a selected one of a plurality of frequencies and operative in a mode in which certain of the frequencies occur repetitively, coupled to a frequency dependent impedance;
- impedance compensation means adapted to present to said signal processing means compensation for the impedance variation of said frequency dependent impedance; and
means responsive to an impedance mismatch at a particular frequency for controlling the characteristics of said impedance compensation means when said particular frequency recurs so as to reduce said mismatch. - View Dependent Claims (2, 3)
- impedance compensation means adapted to present to said signal processing means compensation for the impedance variation of said frequency dependent impedance; and
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4. An impedance matching arrangement of a frequency hopping radio communication system, said arrangement including signal processing means tunable to a selected one of a plurality of frequencies and operative in a mode in which certain of the frequencies occur repetitively, coupled to an antenna having a frequency dependent impedance;
- impedance compensation means adapted to present to said signal processing means compensation for the impedance variation of said frequency dependent impedance; and
means responsive to an impedance mismatch at a particular frequency for controlling the characteristics of said impedance compensation means when said particular frequency recurs so as to reduce said mismatch. - View Dependent Claims (5, 6, 7, 8, 9)
- impedance compensation means adapted to present to said signal processing means compensation for the impedance variation of said frequency dependent impedance; and
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10. An impedance matching arrangement, comprising:
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signal processing means tunable to selected frequencies, to be coupled to a frequency dependent impedance, said signal processing means being operative in a mode in which it is repetitively tuned to certain frequencies; impedance compensation means for presenting to said signal processing means compensation for impedance variation of the frequency dependant impedance when the frequency dependent impedance is coupled to said signal processing means; and means, responsive to an impedance mismatch at a tuning of said signal processing means to a particular frequency, for controlling characteristics of said impedance compensation means when the frequency dependent impedance is coupled to said signal processing means and the tuning of said signal processing means to the particular frequency recurs, so as to reduce the mismatch. - View Dependent Claims (11)
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12. In a frequency hopping radio communication system having a frequency dependent antenna and signal processing means coupled to said frequency dependent antenna and tunable to selected frequencies, said signal processing means being operative in a mode in which the frequency of said signal processing means hops rapidly from being tuned to one frequency to being tuned to another and tuning to certain frequencies occurs repetitively, the improvement comprising:
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impedance compensation means for presenting to said signal processing means compensation for impedance variation of said frequency dependent antenna; and means, responsive to an impedance mismatch at a tuning of said signal processing means to a particular frequency, for controlling characteristics of said impedance compensation means when the tuning of said signal processing means to the particular frequency recurs, so as to reduce the mismatch. - View Dependent Claims (13, 14, 15, 16, 17)
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Specification