Receiver for personal radio paging service

• US 5,054,120 A
• Filed: 02/04/1991
• Issued: 10/01/1991
• Est. Priority Date: 03/24/1988
• Status: Expired due to Fees

• Current Assignee: Hitachi Kokusai Electric Incorporated (Hitachi, Ltd.)
• Original Assignee: Kokusai Electric Co., Ltd., Nippon Telegraph and Telephone Corporation
• Inventors: Ushiyama, Katsumi, Sakamoto, Sadafumi, Nishikawa, Seiji
• Primary Examiner(s): Eisenzopf, Reinhard
• Assistant Examiner(s): URBAN, EDWARD F
• Application Number:
  US07/651,045
• Time in Patent Office: 239 Days
• Field of Search: 455/90, 455/97, 455/349, 455/351, 455/269, 455/129, 455/344, 455/280, 455/228, 343/702, 343/718, 343/741, 361/422, 361/424, 340/925.44
• US Class Current: 455/351
• CPC Class Codes: G08B 3/1016 using wireless transmission calling systems using transmission by inductive loop H04B5/00
• CPC Class Codes: G08B 3/1058 Pager holders or housings casings for electric apparatus H05K5/00
• CPC Class Codes: H01Q 1/243 with built-in antennas
• CPC Class Codes: H01Q 7/00 Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop
• CPC Class Codes: H04B 1/086 Portable receivers

Abstract

A personal radio paging service receiver is housed in a thin, card-shaped housing. The housing houses the circuitry of the receiver and is formed by fixedly sandwiching a frame made as an insulator between two parallel rectangular panels of equal size made of conductive material. Conductive fasteners are provided which electrically connect the separate panels at opposed sides thereof. A conductive fastener electrically connects one of the panels at one end and a conductive member provides an input path to a receiving input circuit of the receiver so that the housing serves as a radio frequency receiving antenna.

Claims

1. A personal radio paging service card-shaped microminiature receiver having a think card-shaped housing for housing therein radio receiver circuitry including a tuning circuit and defining an antenna within which said circuitry is enclosed, the housing comprising an insulative frame defining a space within which said circuitry is enclosed and a pair of separate thin, flat, conductive, panels disposed overlaying opposite sides of the frame within major sides thereof in opposed relationship sandwiching the frame therebetween and secured thereto enclosing said space within which said circuitry is enclosed, a conductive fastener fixing one of the conductive panels on the frame on the one side thereof, a conductive member disposed between said frame and said one panel secured by said conductive fastener in electrical contact with said one panel and extending into said space defining a conductive input from said one panel connected to said circuitry for radio frequency inputs received from said one panel, and another conductive fastener fixing said one panel on the same frame at another side thereof, and another conductive member fixed by said another fastener for defining a conductive path between the conductive panels so that said housing functions as a radiofrequency receiving antenna connected

2. A personal radio paging service card-shaped microminiature receiver according to claim 1, in which said card-shaped panels are rectangular and of the same size.

3. A personal radio paging service card-shaped microminiature receiver according to claim 1, in which said circuitry comprises a radio frequency input circuit connected to the first-mentioned conductive member and having a capacitor connected defining said tuning circuit with said conductive panels for effectively tuning the antenna.

4. A personal radio paging service card-shaped microminiature receiver according to claim 1, in which the second mentioned conductive member effectively electrically connecting the panels connects them at corners thereof.