Tunable slot antenna
First Claim
Patent Images
1. A tunable slot antenna comprising:
- a flat conductive cubic shaped into a rectangular parallelepiped as a whole;
a slender strip conductor extending along the direction of a resonant axis of a space inside said flat conductive cubic, and placed so as to be isolated from said flat conductive cubic;
a radio wave transmitting and receiving slot formed in an upper surface of said flat conductive cubic so as to intersect said strip conductor at a position intermediate and spaced from ends of said strip conductor and forming a cross with said strip conductor;
means for supplying RF power between a connection point set to said strip conductor and a side wall of said flat conductive cubic; and
a variable capacitor electrically connected between one point, said one point defining a capacitor connecting point, lying in the neighborhood thereof including an end far from the connection point of said strip conductor and the side wall of said flat conductive cubic.
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Abstract
In order to offer a tunable slot antenna capable of varying an impedance matching center frequency thereof, there is provided a coaxial resonant slot antenna for supplying RF power to a strip conductor placed in a flat conductive cubic with a slot formed in its upper surface and electrically insulated from the flat conductive cubic, wherein a variable capacitor is electrically connected between one point lying in the neighborhood thereof including an end far from a RF power connection point on the strip conductor and a side wall of the flat conductive cubic, and a d.c. voltage to be applied across the variable capacitor is supplied to the connection point.
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Citations
26 Claims
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1. A tunable slot antenna comprising:
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a flat conductive cubic shaped into a rectangular parallelepiped as a whole; a slender strip conductor extending along the direction of a resonant axis of a space inside said flat conductive cubic, and placed so as to be isolated from said flat conductive cubic; a radio wave transmitting and receiving slot formed in an upper surface of said flat conductive cubic so as to intersect said strip conductor at a position intermediate and spaced from ends of said strip conductor and forming a cross with said strip conductor; means for supplying RF power between a connection point set to said strip conductor and a side wall of said flat conductive cubic; and a variable capacitor electrically connected between one point, said one point defining a capacitor connecting point, lying in the neighborhood thereof including an end far from the connection point of said strip conductor and the side wall of said flat conductive cubic. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A tunable slot antenna comprising:
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a multilayer circuit board comprised of circuit boards stacked on each other so as to form first, second and third layers in order from above; a flat conductive cubic having an upper surface comprised of a first conductor surface formed in the first layer and a slot formed by partially deleting said first conductor surface; a strip conductor formed by a third conductor surface formed in the second layer; said flat conductive cubic having a bottom face formed by a second conductor surface formed in the third layer and a side formed by a plurality of side through holes provided between the first and third layers so as to extend through the second layer; a conductive island formed in said first conductor surface; a variable capacitor implemented on said first conductor surface; a line conductor for electrically connecting the conductive island and a capacitor connecting point, said line conductor having a through hole for capacitor connection formed between the first and second layers; a voltage variable d.c. source for generating a d.c. voltage, said voltage variable d.c. source being electrically connected to the other terminal of a device for blocking a flow of a high-frequency current, whose one terminal is electrically connected to a connection point and being provided with a control terminal for receiving a control signal from a voltage control circuit for controlling a source voltage. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
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Specification