Connectorless antenna coupler
First Claim
1. An antenna coupler for coupling a portable radio having an attached antenna system to an external transmission line, the attached antenna system having at least one radiating element and a first transmission line disposed adjacent to an exterior wall of the radio, the coupler comprising:
- a conductive shield dimensioned to enclose a portion of the radio, said portion containing the first transmission line and said radiating element, the shield inhibiting radiation by the radiating element;
resonator means disposed in said shield for coupling energy between the external transmission line and the first transmission line when the shield encloses said portion of the radio;
means for connecting said resonator means to the external transmission line;
said shield dimensioned so that when it encloses said portion the phase velocity of the first transmission line decreases to approximately V/N where N is an integer ≧
2, and V is the phase velocity of the first transmission line with the shield not enclosing said portion.
1 Assignment
0 Petitions
Accused Products
Abstract
A metal shield is dimensioned to enclose a portion of a portable radio having an internal antenna and a first transmission line. A transmission line mounted in the shield is positioned to be adjacent to the first transmission line when the shield engages the radio and permits energy to be coupled between the resonator and the first transmission line. The first transmission line and the shield are dimensioned so that the electrical length of the first transmission line increases to 2L when the shield engages the radio, where L is the electrical length of the first transmission line when the shield does not engage the radio. This electrical length transformation by an integral multiple of one half wavelength helps to maintain the input impedance to the internal antenna.
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Citations
18 Claims
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1. An antenna coupler for coupling a portable radio having an attached antenna system to an external transmission line, the attached antenna system having at least one radiating element and a first transmission line disposed adjacent to an exterior wall of the radio, the coupler comprising:
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a conductive shield dimensioned to enclose a portion of the radio, said portion containing the first transmission line and said radiating element, the shield inhibiting radiation by the radiating element; resonator means disposed in said shield for coupling energy between the external transmission line and the first transmission line when the shield encloses said portion of the radio; means for connecting said resonator means to the external transmission line; said shield dimensioned so that when it encloses said portion the phase velocity of the first transmission line decreases to approximately V/N where N is an integer ≧
2, and V is the phase velocity of the first transmission line with the shield not enclosing said portion. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. In an antenna system for a portable radio, the system having a certain input impedance at a certain frequency of operation and having antenna components enclosed within a portion of the radio including a radiating element and a first transmission line connected to the radiating element, the improvement comprising:
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means for enclosing said portion of the radio containing said radiating element and first transmission line to prevent radiation by the radiating element from escaping the enclosing means; resonator means disposed in said enclosing means for coupling energy between said first transmission line and an external transmission line when said enclosing means encloses said portion of the radio, said enclosing means and resonator means cooperating with the radiating element and first transmission line to keep said certain input impedance from substantially changing when said enclosing means encloses said portion of the radio, said enclosing means when enclosing said portion of the radio causing the electrical length of said first transmission line to increase to approximately N×
L without the need for manual turing, where N is an integer ≧
2 and L is the electrical length of the first transmission line with the enclosing means not enclosing said portion of the radio. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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17. A method for simultaneously disabling an internal antenna system within a portable radio and coupling the radio to a remote external antenna, the internal antenna system including a radiating element and a first transmission line connected to the radiating element, the method comprising the steps of:
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enclosing the portion of the radio containing the radiating element and the first transmission line with a shield to prevent radiation from the radiating element; coupling a second transmission line to said first transmission line by disposing said second transmission line substantially adjacent said first transmission line, said second transmission line being coupled to the remote antenna; causing the electrical length of said first transmission line, in response to said shield enclosing said portion of the antenna, to increase to approximately N×
L, where N is an integer ≧
2 and L is the electrical length of the first transmission line with the shield not enclosing said portion of the radio. - View Dependent Claims (18)
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Specification