Flexible antenna with capacative plate coupling

Claim 2

A whip antenna comprising an elongated flexible core which is of electrically insulating material and which extends along a major part of the length of the antenna, electrically conducting flexible material carried on the surface of said core and extending along a major part of the length of the core to provide the required radio frequency path along the antenna, and a capacitor which is connected in said path, and which is formed by a pair of opposed spaced thin electrodes which lie on the surface of, are carrried by and embrace said core along part of its length, one of said electrodes being in electrical contact with an end of said material and the other of said electrodes being out of electrical contact with said one electrode and with said end of said material, the core material constituting the dielectric of said capacitor, said antenna being flexible over the length of the core carrying the material and the electrodes.

Claim 3

A whip antenna according to claim 1 wherein said core is fibreglass rod.

Claim 4

A whip antenna, according to claim 1, wherein the capacitor electrodes are formed by lengths of copper tape lying longitudinally along the core.

Claim 5

A whip antenna according to claim 1 wherein said electrically conducting material is a sleeve of braided copper wire which surrounds the core.

Claim 6

A whip antenna according to claim 1 wherein said core is formed in a plurality of sections and there is means detachably to secure said sections to one another to form the complete antenna.

Claim 7

A whip antenna comprising a plurality of sections each having an elongated flexible core of electrically insulating material which extends along a major part of the length of the section and which carries on its surface electrically conducting flexible material to provide the required radio frequency path along the antenna, screw-fixing means secured to the cores of said sections to enable the sections to be secured together end-to-end to form the antenna, and at least one of said sections having a capacitor which is connected in said path and which is formed by a pair of opposed spaced thin electrodes which lie in the surface of, are carried by and embrace the core of that section, one of said electrodes being in electrical contact with an end of said material and the other of said electrodes being out of electrical contact with said one electrode and with said end of said material, the material of the core of that section constituting the dielectric of said capacitor, said core sections being flexible over the lengths thereof carrying the material and the electrodes.

Claim 8

A whip antenna comprising a plurality of sections each having an elongated flexible core of electrically insulating material which extends along a major part of the length of the section and which carries on its surface electrically conducting flexible material to provide the required radio frequency path along the antenna, screw-fixing means secured to the cores of said sections to enable the sections to be secured together end-to-end to form the antenna, and at least one of said sections having a capacitor which is connected in said path and which is formed by a pair of opposed spaced thin electrodes which lie in the surface of, are carried by and embrace the core of that section, one of said electrodes being in electrical contact with an end of said material and the other of said electrodes being out of electrical contact with said one electrode and with said end of said material, the material of the core of that section constituting the dielectric of said capacitor, said core sections being flexible over the lengths thereof carrying the material and the electrodes.

Claim 9

A whip antenna according to claim 6 wherein said plurality is three and a second capacitor is connected in said ratio frequency path at a point spaced from the previously mentioned capacitor, the second capacitor being formed in the same manner as the previously mentioned capacitor.

Claim 10

A section of a whip antenna which comprises a plurality of sections for joining end-to-end to form the antenna, said section comprising an elongated flexible core which is of electrically insulating material, screw-fixing means secured to one end of the core for joining the section to an adjacent section of the complete antenna, a sleeve of braided copper wire surrounding said core over a major part of its length, and a capacitor which is connected between said screwfixing means and said sleeve and which is formed by a pair of opposed spaced thin electrodes which lie in the surface of, are carried by and embrace said core, one of said electrodes being in electrical contact with an end of said sleeve and the other of said electrodes being out of electrical contact with said one electrode and with said end of said sleeve, the material of the core constituting the dielectric of said capacitor, said section being flexible over the lengths thereof carrying the sleeve and the electrodes.

Claim 11

A section of a whip antenna which comprises a plurality of sections for joining end-to-end to form the antenna, said section comprising an elongated flexible core which is of electrically insulating material, screw-fixing means secured to one end of the core for joining the section to an adjacent section of the complete antenna, a sleeve of braided copper wire surrounding said core over a major part of its length, and a capacitor which is connected between said screwfixing means and said sleeve and which is formed by a pair of opposed spaced thin electrodes which lie in the surface of, are carried by and embrace said core, one of said electrodes being in electrical contact with an end of said sleeve and the other of said electrodes being out of electrical contact with said one electrode and with said end of said sleeve, the material of the core constituting the dielectric of said capacitor, said section being flexible over the lengths thereof carrying the sleeve and the electrodes.

Claim 12

A whip antenna comprising an elongated flexible core which is of electrically insulating material and which extends along a major part of the length of the antenna, a sleeve of braided copper wire surrounding said core and extending along the major part of the length of the core to provide the required radio frequency path along the antenna, and a pair of thin electrodes which lie on the surface of said rod over part of its length and which constitutes a capacitor connected in said path, said core constituting the dielectric of the capacitor, said antenna being flexible over the length of the core carrying the sleeve and the capacitor.

Claim 13

A whip antenna comprising an elongated flexible core which is of electrically insulating material and which extends along a major part of the length of the antenna, a sleeve of braided copper wire surrounding said core and extending along the major part of the length of the core to provide the required radio frequency path along the antenna, and a pair of thin electrodes which lie on the surface of said rod over part of its length and which constitutes a capacitor connected in said path, said core constituting the dielectric of the capacitor, said antenna being flexible over the length of the core carrying the sleeve and the capacitor.

Claim 14

A whip antenna according to claim 9 wherein said pair of electrodes are each formed by a length of copper tape secured to the surface of said rod.