Slip-on portable antenna

Claim 2

A portable antenna for transmitting and receiving in the cellular frequency band adapted for mounting on a motor vehicle's side window and enabling easy and rapid mounting and removal, which comprises: a base member generally formed of plastic, said base member having means for carrying a current fed radiator, means for carrying a field-canceling conductor, means for at least partially overlying the side window, and means for carrying the proximal end portion of a coaxial cable; said current-fed radiator carried by said base member and having a first portion for location on the inside of the side window, a second contiguous portion for overlying the side window, and a third portion, contiguous with said second portion, for location outside of the side window with the distal end thereof extending upwardly when in use; a field-canceling conductor carried by said base portion for location on the inside of the side window; a coaxial cable carried by the base portion and having a main conductor and a ground conductor; means connecting said main conductor to a proximal end portion of said current fed radiator; means connecting said ground conductor to said field-canceling member; said current-fed radiator being dimensioned so that said second portion of said radiator is a relatively low impedance area.

Claim 3

A portable antenna a defined by claim 1, said field-canceling conductor being approximately one-half electrical wavelength from end to end with said ground conductor being connected at about its mid-point.

Claim 4

A portable antenna as defined by claim 1, said field-canceling conductor comprising a first quarter wavelength member and a second quarter wavelength member with said ground conductor connected to proximal ends of said first and second quarter wavelength members.

Claim 5

A portable antenna as defined by claim 1, said current-fed radiator having a total electrical length of about three-quarter wavelength.

Claim 6

A portable antenna as defined by claim 4, said third portion being about 5/8 wavelength and the combined first and second portions being 1/8 wavelength.

Claim 7

A portable antenna as defined by claim 1, said base member having a box member for location on the inside of the window, said box member enclosing a portion of said field-canceling member, a portion of said cable and the proximal end of said current-fed radiator.

Claim 8

A portable antenna for transmitting and receiving in the cellular frequency band adapted for mounting on a motor vehicle's side window and enabling easy and rapid mounting and removal, which comprises: a base member, said base member being generally formed of plastic and having means for at least partially overlying the side window; said base member having means for carrying a current-fed radiator, means for carrying a field-canceling conductor, and means for carrying the proximal end portion of a coaxial cable; said current-fed radiator carried by said base member and having a first portion for location on the inside of the side window, a second contiguous portion for overlying the side window and a third portion, contiguous with said second portion, for location outside of the side window with the distal end thereof extending upwardly when in use; a field-canceling conductor carried by said base portion and for location on the inside of the side window; a coaxial cable carried by the base portion and having a main conductor and a ground conductor; means connecting said main conductor to a proximal end portion of said current fed radiator; means connecting said ground conductor to said field-canceling member; said current-fed radiator being dimensioned so that said second portion of said radiator is not a high impedance area.

Claim 9

A portable antenna for transmitting and receiving in the cellular frequency band adapted for mounting on a motor vehicle's side window and enabling easy and rapid mounting and removal, which comprises: a base member, said base member being generally formed of plastic and having means for at least partially overlying the side window; said base member having means for carrying a current-fed radiator, means for carrying a field-canceling conductor, and means for carrying the proximal end portion of a coaxial cable; said current-fed radiator carried by said base member and having a first portion for location on the inside of the side window, a second contiguous portion for overlying the side window and a third portion, contiguous with said second portion, for location outside of the side window with the distal end thereof extending upwardly when in use; a field-canceling conductor carried by said base portion and for location on the inside of the side window; a coaxial cable carried by the base portion and having a main conductor and a ground conductor; means connecting said main conductor to a proximal end portion of said current fed radiator; means connecting said ground conductor to said field-canceling member; said current-fed radiator being dimensioned so that said second portion of said radiator is not a high impedance area.