Broadband tunable antenna

Claim 2

A broadband tunable antenna comprising a first radiating element resonant at a first band of frequencies, a second radiating element resonant at a second band of frequencies disposed parallel to and coextensive with said first radiating element, means coupling one end of said first radiating element to one end of said second radiating element and adjustable capacitive tuning means connected to the other end of said second radiating element.

Claim 3

A broadband tunable antenna comprising a helix resonant at a first band of frequencies, a bar-shaped element resonant at a second band of frequencies disposed parallel to said helix, means coupling one end of said helix to one end of said element and adjustable capacitive tuning means connected to the other end of said element.

Claim 4

A broadband tunable antenna comprising a helix resonant at a first band of frequencies, a bar-shaped element resonant at a second band of frequencies disposed parallel to said helix, means coupling one end of said helix to one end of said element and adjustable capacitive tuning means connected to the other end of said element.

Claim 5

A broadband tunable antenna comprising a helical radiating element resonant at a first band of frequencies connected to a bar-shaped radiating element resonant at a second band of frequencies, adjustable capacitive tuning means connected to said bar radiating element, said helical radiating element comprising at least two sections, the first section of said helical element being more closely wound than said second section and switching means connected between the middle portion of said first section of said helical radiating element and the junction of said first and second sections.

Claim 6

A broadband tunable antenna comprising a helical radiating element resonant at a first band of frequencies connected to a bar-shaped radiating element resonant at a second band of frequencies, adjustable capacitive tuning means connected to said bar radiating element, said helical radiating element comprising at least two sections, the first section of said helical element being more closely wound than said second section and switching means connected between the middle portion of said first section of said helical radiating element and the junction of said first and second sections.

Claim 7

A broadband tunable antenna comprising a helical radiating element resonant at a first band of frequencies, a bar-shaped radiating element resonant at a second band of frequencies and disposed parallel to said helical element and within said helical radiating element, adjustable capacitive tuning means connected to one end of said bar-shaped element, the other end of said bar-shaped element being connected to one end of said helical element, said helical element comprising at least two sections, the first section of said helical element being more closely wound than said second section of said helical element and switching means coupling the midpoint of said first section and the junction of said first and second sections.

Claim 8

A broadband tunable antenna comprising a helical radiating element resonant at a first band of frequencies, a bar-shaped radiating element resonant at a second band of frequencies and disposed parallel to said helical element and within said helical radiating element, adjustable capacitive tuning means connected to one end of said bar-shaped element, the other end of said bar-shaped element being connected to one end of said helical element, said helical element comprising at least two sections, the first section of said helical element being more closely wound than said second section of said helical element and switching means coupling the midpoint of said first section and the junction of said first and second sections.

Claim 9

A broadband tunable antenna comprising a first radiating element resonant at a first band of frequencies, a second radiating element resonant at a different band of frequencies and adjustable capacitive coupling and tuning means connecting said first radiating element to said second radiating element.

Claim 10

A broadband tunable antenna comprising a first radiating element resonant at a first band of frequencies, a second radiating element resonant at a different band of frequencies and adjustable capacitive coupling and tuning means connecting said first radiating element to said second radiating element.

Claim 11

A broadband tunable antenna comprising a helical radiating element resonant at a first band of frequencies, a bar radiating element resonant at a different band of frequencies, first adjustable capacitive coupling and tuning means connecting the upper part of said helical radiating element to one end of said bar radiating element and second adjustable capacitive coupling and tuning means connecting the lower part of said helical radiating element to the other end of said bar radiating element.

Claim 12

A broadband tunable antenna comprising a helical radiating element resonant at a first band of frequencies, a bar radiating element resonant at a different band of frequencies, first adjustable capacitive coupling and tuning means connecting the upper part of said helical radiating element to one end of said bar radiating element and second adjustable capacitive coupling and tuning means connecting the lower part of said helical radiating element to the other end of said bar radiating element.

Claim 13

An antenna comprising an enclosure, a broadband tunable antenna disposed within said enclosure, said broadband tunable antenna comprising a helical radiating element resonant at a first band of frequencies, a bar radiating element resonant at a different band of frequencies and disposed parallel to said helical element, first adjustable capacitive coupling and tuning means connecting the upper part of said helical radiating element to one end of said bar radiating element and second adjustable capacitive coupling and tuning means connecting the lower part of said helical radiating element to the other end of said bar radiating elemenT, an inductor connected between said other end of said bar element and ground, a plurality of switching means connected between points on said helical radiating element, said points being located along the length of said helical element so as to divide said helical element into a plurality of portions.

Claim 14

An antenna comprising an enclosure, a broadband tunable antenna disposed within said enclosure, said broadband tunable antenna comprising a helical radiating element resonant at a first band of frequencies, a bar radiating element resonant at a different band of frequencies and disposed parallel to said helical element, first adjustable capacitive coupling and tuning means connecting the upper part of said helical radiating element to one end of said bar radiating element and second adjustable capacitive coupling and tuning means connecting the lower part of said helical radiating element to the other end of said bar radiating elemenT, an inductor connected between said other end of said bar element and ground, a plurality of switching means connected between points on said helical radiating element, said points being located along the length of said helical element so as to divide said helical element into a plurality of portions.

Claim 15

A broadband tunable antenna comprising a helical radiating element resonant at a first band of frequencies, a bar radiating element resonant at a different band of frequencies and located parallel to said helical element and outside of said helical element, said bar element having a triangular cross-sectional shape, first adjustable capacitive coupling and tuning means connecting the upper part of said helical element to the upper end of said bar element and second adjustable capacitive coupling and tuning means connecting the lower part of said helical element to the lower end of said bar element, first switching means coupling the middle portion of said helical element to the middle portion of said bar element, and second switching means coupling the lower end of said helical element to ground.

Claim 16

A broadband tunable antenna comprising a helical radiating element resonant at a first band of frequencies, a bar radiating element resonant at a different band of frequencies and located parallel to said helical element and outside of said helical element, said bar element having a triangular cross-sectional shape, first adjustable capacitive coupling and tuning means connecting the upper part of said helical element to the upper end of said bar element and second adjustable capacitive coupling and tuning means connecting the lower part of said helical element to the lower end of said bar element, first switching means coupling the middle portion of said helical element to the middle portion of said bar element, and second switching means coupling the lower end of said helical element to ground.

Claim 17

An antenna comprising an enclosure, a broad band tunable antenna disposed within said enclosure, said broadband tunable antenna comprising a helical radiating element resonant at a first band of frequencies, a bar radiating element resonant at a different band of frequencies, said bar element being disposed parallel to said helical element, first adjustable capacitive coupling and tuning means connecting one end portion of said helical radiating element to one end portion of said bar radiating element and second adjustable capacitive coupling and tuning means connecting the other end portion of said helical radiating element to the other end portion of said bar radiating element, first switching means coupling the middle portion of said helical element to the middle portion of said bar element, second switching means coupling one end of said helical element to ground, first motive means coupled to said first and second adjustable capacitive coupling means and second motive means coupled to said first and second switching means.

Claim 18

An antenna comprising an enclosure, a broad band tunable antenna disposed within said enclosure, said broadband tunable antenna comprising a helical radiating element resonant at a first band of frequencies, a bar radiating element resonant at a different band of frequencies, said bar element being disposed parallel to said helical element, first adjustable capacitive coupling and tuning means connecting one end portion of said helical radiating element to one end portion of said bar radiating element and second adjustable capacitive coupling and tuning means connecting the other end portion of said helical radiating element to the other end portion of said bar radiating element, first switching means coupling the middle portion of said helical element to the middle portion of said bar element, second switching means coupling one end of said helical element to ground, first motive means coupled to said first and second adjustable capacitive coupling means and second motive means coupled to said first and second switching means.

Claim 19

An antenna comprising a streamlined pressure-proof, water-tight radome, said radome being elongated vertically and having one side portion thereof tapered laterally with respect to the vertical axis of said radome, a broadband tunable antenna disposed within said radome, said broadband tunable antenna comprising a helical radiating element resonant at a first band of frequencies and a bar radiating element resonant at a different band of frequencies, means disposing said bar element parallel and adjacent to said helical element with the said bar element located in the tapered portion of said radome, first adjustable capacitive coupling and tuning means connecting the upper part of said helical radiating element to the upper part of said bar radiating element, a second adjustable capacitive coupling and tuning means connecting the lower part of said helical radiating element to the lower part of said bar radiating element, first switching means coupling the middle portion of said helical element to the middle portion of said bar element, second switching means coupling the lower end of said helical element to ground, a first motor coupled to said first adjustable capacitive coupling and tuning means, a second motor coupled to said second adjustable capacitive coupling and tuning means, a first solenoid connected to said first switching means and a second solenoid connected to said switching means.

Claim 20

An antenna comprising a streamlined pressure-proof, water-tight radome, said radome being elongated vertically and having one side portion thereof tapered laterally with respect to the vertical axis of said radome, a broadband tunable antenna disposed within said radome, said broadband tunable antenna comprising a helical radiating element resonant at a first band of frequencies and a bar radiating element resonant at a different band of frequencies, means disposing said bar element parallel and adjacent to said helical element with the said bar element located in the tapered portion of said radome, first adjustable capacitive coupling and tuning means connecting the upper part of said helical radiating element to the upper part of said bar radiating element, a second adjustable capacitive coupling and tuning means connecting the lower part of said helical radiating element to the lower part of said bar radiating element, first switching means coupling the middle portion of said helical element to the middle portion of said bar element, second switching means coupling the lower end of said helical element to ground, a first motor coupled to said first adjustable capacitive coupling and tuning means, a second motor coupled to said second adjustable capacitive coupling and tuning means, a first solenoid connected to said first switching means and a second solenoid connected to said switching means.

Claim 21

An antenna according to claim 10 wherein said bar radiating element is hollow and said first switching means is disposed in said hollow bar element and further including an electrically shielded chamber, said first and second motors being disposed within said electrically shielded chamber.

Claim 22

A broadband tunable antenna comprising a first radiating element resonant at a first band of frequencies, a second radiating element resonant at a differenT band of frequencies, adjustable capacitive coupling and tuning means connecting said first radiating element to said second radiating element, one of said radiating elements being hollow and driving means disposed in said hollow radiating element for operation of said adjustable coupling and tuning means.

Claim 23

A broadband tunable antenna comprising a first radiating element resonant at a first band of frequencies, a second radiating element resonant at a differenT band of frequencies, adjustable capacitive coupling and tuning means connecting said first radiating element to said second radiating element, one of said radiating elements being hollow and driving means disposed in said hollow radiating element for operation of said adjustable coupling and tuning means.

Claim 24

A broadband tunable antenna comprising a helical radiating element resonant at a first band of frequencies, a bar radiating element resonant at a different band of frequencies and located parallel to said helical element, said bar element being hollow, first adjustable capacitive coupling and tuning means connecting one end portion of said helical element to one end portion of said bar element and second adjustable capacitive coupling and tuning means connecting the other end portion of said helical element to the other end of said bar element, first switching means coupling the middle portion of said helical element to the middle portion of said bar element, and second switching means coupling one end portion of said helical element to ground, said first switching means being disposed in said hollow bar element.

Claim 25

A broadband tunable antenna comprising a helical radiating element resonant at a first band of frequencies, a bar radiating element resonant at a different band of frequencies and located parallel to said helical element, said bar element being hollow, first adjustable capacitive coupling and tuning means connecting one end portion of said helical element to one end portion of said bar element and second adjustable capacitive coupling and tuning means connecting the other end portion of said helical element to the other end of said bar element, first switching means coupling the middle portion of said helical element to the middle portion of said bar element, and second switching means coupling one end portion of said helical element to ground, said first switching means being disposed in said hollow bar element.