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US 5,856,808 AGranted
Single feed point matching systems
AssigneeEricsson Inc.
InventorsHoward E. Holshouser, Robert A. Sadler, Gerard Hayes, John W. Gammon
Life of this patent
Estimating the term…
Abstract
Single feed point matching systems for radiotelephones include a retractable antenna and a stationary ferrule contact which are configured to define a coaxial capacitor therebetween when the antenna is in the extended position.
Claims26
An antenna assembly, comprising:
- a cylindrical antenna having a conductive core and an outer surface and including opposing first and second ends defining a central axis through the center thereof, said antenna including upper and lower contacts in electrical communication with said core and positioned on the outer surface of said antenna;
- and
- a non-conductive base unit having top and bottom ends and including an aperture therethrough, said aperture configured to receive portions of said antenna therein, said base unit including a conductive ferrule fixedly attached to and extending from the bottom of said base unit;
- wherein said antenna retracts and extends in and out of said base unit such that when said antenna is retracted said antenna upper contact electrically contacts said ferrule, and when said antenna is extended said ferrule and said antenna define a capacitor therebetween.
1 more element
A radiotelephone with a matching system comprising:
- a radiotelephone housing;
- a printed circuit board disposed in said housing;
- an antenna connector secured to said housing, said antenna connector comprising first and second contacts;
- an antenna base having an opening therein attached to said radiotelephone housing, said antenna base including a portion which extends out of said radiotelephone and a portion which is contained within said radiotelephone, said portion which is contained within said housing including a contact ferrule thereon;
- and
- a longitudinally extending antenna adapted to be received in said antenna base opening such that said antenna is free to retract and extend relative thereto, said antenna including upper and lower electrical contacts, wherein when said antenna is retracted said upper contact electrically communicates with said contact ferrule and said first antenna connector contact to define a first signal path, and when said antenna is extended said lower contact is spaced apart from said contact ferrule and said lower contact and said contact ferrule electrically communicate with a respective one of said second contact and said first contact to provide a matching L-C circuit, and wherein said capacitor in said L-C circuit is defined by said contact ferrule and said antenna.
3 more elements
A matching system for a radiotelephone with a retractable antenna, comprising:
- a cylindrical antenna having a conductive core and an outer surface and including opposing first and second ends defining a central axis through the center thereof, said antenna including upper and lower contacts in electrical communication with said core;
- and
- a non-conductive base unit having top and bottom ends and including an aperture therethrough, said aperture configured to receive portions of said antenna therein, said base unit including a conductive ferrule fixedly attached to, and extending from, the bottom of said base unit;
- wherein said antenna retracts and extends in and out of said base unit such that when said antenna is retracted said antenna upper contact electrically contacts said ferrule, and when said antenna is extended a capacitive element for a matching circuit is activated by electrical communication between and mechanical configuration of said ferrule and said antenna.
1 more element
Dependencies are inferred from the claim text.