Radiating antenna cable apparatus
First Claim
1. A distributed antenna system comprising:
- an antenna cable;
a direct current (DC) bias circuit coupled to the antenna cable, the DC bias circuit including circuitry which provides first and second multiplexed DC bias voltages; and
a cable termination circuit coupled to the antenna cable which provides first and second cable termination impedance in response to the first and second time multiplexed DC bias voltages.
1 Assignment
0 Petitions
Accused Products
Abstract
A distributed antenna system for wireless communication inside enclosed areas such as buildings, tunnels, etc., includes an antenna cable and a termination circuit which provides a plurality of termination impedances for the cable, varying as a function of time. The termination circuit may include a diode coupled to the cable at a remote end of the cable and a bias voltage generator coupled to a local end of the cable. Changes in bias voltage alternately forward biases and reverse biases the diode, effectively changing the termination impedance of the antenna cable. As the impedance changes, nodes and regions of high multipath distortion move, so the probability is greatly increased that personnel with remote communication equipment will be able to send and receive good quality signals over the antenna cable at any given location.
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Citations
34 Claims
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1. A distributed antenna system comprising:
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an antenna cable; a direct current (DC) bias circuit coupled to the antenna cable, the DC bias circuit including circuitry which provides first and second multiplexed DC bias voltages; and a cable termination circuit coupled to the antenna cable which provides first and second cable termination impedance in response to the first and second time multiplexed DC bias voltages. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A distributed antenna system comprising:
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an antenna cable; and means for providing the cable with first and second time multiplexed cable termination impedance values. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29)
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30. A method for wireless communication through a distributed antenna cable in an enclosed area comprising the steps of:
changing a termination impedance of the cable to alternate between first and second impedance values, whereby, for a given carrier frequency, multipath nodes in the enclosed area change positions responsive to the step of changing. - View Dependent Claims (31, 32, 33, 34)
Specification