Tunable slot antenna with capacitively coupled slot island conductor for precise impedance adjustment
First Claim
1. A slot antenna having a conductive box, a slot in a principal surface of the box, and a conductor disposed in said box to spatially cross said slot while being electrically insulated from said box thereby permitting alternate current (AC) power to be supplied between said conductor and said box, the slot antenna comprising:
- an island conductor provided in said slot and electrically insulated from said box; and
circuitry connected between said island conductor and a wall plate of said box for varying a capacitance between said island conductor and said box;
wherein said circuitry includes a first terminal, a second terminal, and a variable capacitance element responsive to a direct current (DC) voltage at said first terminal for varying a capacitance value between said first and second terminals.
1 Assignment
0 Petitions
Accused Products
Abstract
A coaxial resonant slot antenna includes a flat rectangular conductive box having its top plate with a slot being defined therein, and a strip conductor disposed inside the box and electrically insulated from the box while high frequency or RF power is fed to the strip. An island conductor is provided in the slot for defining a capacitance between itself and the frame. This capacitance is rendered variable in value by use of a variable circuit.
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Citations
15 Claims
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1. A slot antenna having a conductive box, a slot in a principal surface of the box, and a conductor disposed in said box to spatially cross said slot while being electrically insulated from said box thereby permitting alternate current (AC) power to be supplied between said conductor and said box, the slot antenna comprising:
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an island conductor provided in said slot and electrically insulated from said box; and circuitry connected between said island conductor and a wall plate of said box for varying a capacitance between said island conductor and said box; wherein said circuitry includes a first terminal, a second terminal, and a variable capacitance element responsive to a direct current (DC) voltage at said first terminal for varying a capacitance value between said first and second terminals. - View Dependent Claims (2)
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3. A slot antenna having a conductive box, a slot in a principal surface of the box, and a conductor disposed in said box to spatially cross said slot while being electrically insulated from said box thereby permitting alternate current (AC) power to be supplied between said conductor and said box, the slot antenna comprising:
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an island conductor provided in said slot and electrically insulated from said box; circuitry connected between said island conductor and a wall plate of said box for varying a capacitance between said island conductor and said box; and a control circuit for supplying a control signal to said circuitry; and said circuitry having a first terminal connected to said island conductor, a second terminal connected to a wall plate of said box, and a third terminal connected to said control circuit, said circuitry being responsive to the control signal supplied from said control circuit to said third terminal for rendering variable a value of a capacitance between said island conductor connected to said first terminal and the wall plate of said box connected to said second terminal. - View Dependent Claims (4, 5, 6, 7, 8, 9, 10)
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11. A slot antenna having a conductive box, a slot in a principal surface of the box, and a conductor disposed in said box to spatially cross said slot while being electrically insulated from said box thereby permitting alternate current (AC) power to be supplied between said conductor and said box, the slot antenna comprising:
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an island conductor provided in said slot and electrically insulated from said box; and circuitry connected between said island conductor and a wall plate of said box for varying a capacitance between said island conductor and said box; wherein said circuitry has a capacitive element and an impedance-varying device responsive to a DC voltage for rendering an impedance variable. - View Dependent Claims (12)
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13. A slot antenna having a conductive box, a slot in a principal surface of the box, and a conductor disposed in said box to spatially cross said slot while being electrically insulated from said box thereby permitting alternate current (AC) power to be supplied between said conductor and said box, the slot antenna comprising:
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an island conductor provided in said slot and electrically insulated from said box; and circuitry connected between said island conductor and a wall plate of said box for varying a capacitance between said island conductor and said box; wherein said circuitry has a plurality of series connections of capacitive elements and impedance-varying device, each said device rendering variable the impedance in response to a DC voltage applied thereto, said capacitive elements being different in capacitance value from each other.
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14. A slot antenna having a conductive box, a slot formed in a principal surface of the box, a conductor disposed spatially intersecting said slot in said box and electrically insulated from said box, and a coupling section connected to said conductor, said coupler section and said box receiving AC power as fed therebetween, said antenna comprising:
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an island conductor provided in said slot and electrically insulated from said box; a variable capacitance element connected between said island conductor and said box; a resistive element connected between said island conductor and said conductor intersecting said slot; and a variable DC power supply circuit connected to said coupling section for generating and applying a DC voltage to said variable capacitance element via said coupling section and said resistive element. - View Dependent Claims (15)
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Specification