Tunable slot antenna
AssigneeHitachi, Ltd.
InventorKen Takei
Life of this patent
Estimating the term…
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.
Claims26
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.
A tunable slot antenna comprising:
- 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.
Dependencies are inferred from the claim text.