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US 5,706,019 AGranted
Integral antenna assembly for a radio and method of manufacturing
AssigneeMotorola, Inc.
InventorsWilliam Herbert Darden, IV, Kevin Michael Thill
Life of this patent
Estimating the term…
Abstract
Strips (220) of thin metallic material forming pairs of arms on an elongated dielectric tube (110) form a radiator portion of an antenna assembly. A first radiator plate (310) and a second radiator plate (320) are capacitively coupled to respective hot capacitive plate (270) and ground capacitive plate (280) on opposite sides of the dielectric tube and formed in a single etching step to improve manufacturability, reliability and cost of a radio.
Claims20
An antenna assembly for a radio, comprising:
- an elongated dielectric tube having a surface;
- an antenna element comprising at least one pair of arms formed of strips of a thin metallic material disposed on the surface of the elongated dielectric tube concentric with a shape of the elongated dielectric tube;
- a first radiator plate portion integrally formed of the same thin metallic material as one of the pair of arms disposed on the surface of the elongated dielectric tube;
- a second radiator plate portion integrally formed of the same thin metallic material as another of the pair of arms disposed on the surface of the elongated dielectric tube;
- a feedline having a hot lead and a ground lead for feeding energy between the antenna assembly and a radio;
- a hot capacitive plate electrically connected to the hot lead of the feedline and formed of a thin metallic material disposed on a side of the elongated dielectric tube opposite the first radiator plate portion for capacitive coupling with the first radiator plate portion;
- and
- a ground capacitive plate electrically connected to the ground lead of the feedline and formed of a thin metallic material disposed on a side of the elongated dielectric tube opposite the second radiator plate portion for capacitive coupling with the second radiator plate portion;
- and
- wherein, a dielectric constant of the elongated dielectric tube, a width of the elongated dielectric tube, a thickness of the elongated dielectric tube, lengths of the arms, an area of the first and second radiator plate portions and an area of the hot and ground capacitive plates are sufficient to match impedances of the feedline and the antenna element.
7 more elements
An antenna assembly for a radio, comprising:
- an elongated dielectric tube having a surface, the tube closed at a feed end;
- a circularly polarized antenna element comprising two pairs of arms, each of the pairs comprising strips of a thin metallic material disposed on the surface of the elongated dielectric tube concentric with a shape of the elongated dielectric tube and electrically forming a loop;
- a flange protruding from a feed end of the surface of the elongated dielectric tube and forming first and second opposite sides of the flange;
- a first radiator plate portion integrally formed of the same thin metallic material as one of the pair of arms and disposed on the surface of the elongated dielectric tube and the first side of the flange;
- a second radiator plate portion integrally formed of the same thin metallic material as another of the pair of arms disposed on the surface of the elongated dielectric tube and the first side of the flange;
- a feedline having a hot lead and a ground lead for feeding energy between the antenna assembly and a radio;
- a hot capacitive plate electrically connected to the hot lead of the feedline and formed of a thin metallic material disposed on the second side of the flange on a side of the elongated dielectric tube opposite the first radiator plate portion for capacitive coupling with the first radiator plate portion;
- and
- a ground capacitive plate electrically connected to the ground lead of the feedline and formed of a thin metallic material disposed on the second side of the flange on a side of the elongated dielectric tube opposite the second radiator plate portion for capacitive coupling with the second radiator plate portion;
- and
- wherein, a dielectric constant of the elongated dielectric tube, a width of the elongated dielectric tube, a thickness of the elongated dielectric tube, lengths of the arms, an area of the first and second radiator plate portions and an area of the hot and ground capacitive plates are sufficient to match impedances of the feedline and the antenna element.
8 more elements
A radio, comprising:
- an elongated dielectric tube having a surface;
- an antenna element comprising at least one pair of arms formed of strips of a thin metallic material disposed on the surface of the elongated dielectric tube concentric with a shape of the elongated dielectric tube;
- a first radiator plate portion integrally formed of the same thin metallic material as one of the pair of arms disposed on the surface of the elongated dielectric tube;
- a second radiator plate portion integrally formed of the same thin metallic material as another of the pair of arms disposed on the surface of the elongated dielectric tube;
- a feedline having a hot lead and a ground lead for feeding energy between the antenna assembly and a radio;
- a hot capacitive plate electrically connected to the hot lead of the feedline and formed of a thin metallic material disposed on a side of the elongated dielectric tube opposite the first radiator plate portion for capacitive coupling with the first radiator plate portion;
- a ground capacitive plate electrically connected to the ground lead of the feedline and formed of a thin metallic material disposed on a side of the elongated dielectric tube opposite the second radiator plate portion for capacitive coupling with the second radiator plate portion;
- a user interface to the radio;
- and
- a radio transceiver operatively coupled between the user interface, the hot lead of the feedline and the ground lead of the feedline;
- and
- wherein, a dielectric constant of the elongated dielectric tube, a width of the elongated dielectric tube, a thickness of the elongated dielectric tube, lengths of the arms, an area of the first and second radiator plate portions and an area of the hot and ground capacitive plates are sufficient to match impedances of the feedline and the antenna element.
9 more elements
A method of manufacturing an antenna assembly, comprising the steps of:
- (a) providing an elongated dielectric tube and a thin metalization on a surface concentric with the shape of the tube;
- (b) etching the thin metalization to form, in one etching step, at least one pair of arms of strips of the thin metalization, a first radiator plate portion, a second radiator plate portion, a hot capacitive plate on a side of the elongated dielectric tube opposite the first radiator plate portion and a ground capacitive plate on a side of the elongated dielectric tube opposite the second radiator plate portion, wherein, a dielectric constant of the elongated dielectric tube, a width of the elongated dielectric tube, a thickness of the elongated dielectric tube, length of the arms, an area of the first and second radiator plate portions and an area of the hot and ground capacitive plates are sufficient to match impedance of a feedline and a resulting antenna element;
- (c) connecting a hot lead of the feedline to the hot capacitive plate for a capacitive coupling with the first radiator plate portion;
- and
- (d) connecting a ground lead of the feedline to the ground capacitive plate for a capacitive coupling with the second radiator plate portion.
2 more elements
Dependencies are inferred from the claim text.