FI913520A0 - REAKTANSBUFFRAD RAMANTENN OCH FOERFARANDE FOER FRAMSTAELLNING DAERAV. - Google Patents

REAKTANSBUFFRAD RAMANTENN OCH FOERFARANDE FOER FRAMSTAELLNING DAERAV.

Info

Publication number
FI913520A0
FI913520A0 FI913520A FI913520A FI913520A0 FI 913520 A0 FI913520 A0 FI 913520A0 FI 913520 A FI913520 A FI 913520A FI 913520 A FI913520 A FI 913520A FI 913520 A0 FI913520 A0 FI 913520A0
Authority
FI
Finland
Prior art keywords
reactance
taps
antenna
reaktansbuffrad
ramantenn
Prior art date
Application number
FI913520A
Other languages
Finnish (fi)
Inventor
William Tan
Robert Kurcbart
Original Assignee
Motorola Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Motorola Inc filed Critical Motorola Inc
Publication of FI913520A0 publication Critical patent/FI913520A0/en

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q7/00—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
    • H01Q7/02—Collapsible antennas; Retractable antennas
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/27—Adaptation for use in or on movable bodies
    • H01Q1/273—Adaptation for carrying or wearing by persons or animals

Landscapes

  • Details Of Aerials (AREA)
  • Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)
  • Aerials With Secondary Devices (AREA)
  • Support Of Aerials (AREA)
  • Variable-Direction Aerials And Aerial Arrays (AREA)
  • Investigating, Analyzing Materials By Fluorescence Or Luminescence (AREA)
  • Luminescent Compositions (AREA)
  • Microscoopes, Condenser (AREA)

Abstract

A reactance buffer (218) maintains a substantially constant resonant frequency for an adjustable size loop antenna (200) having first (202) and second (204) antenna segments. Each segment has first (206, 208) and second (212, 214) ends, the first ends (206, 208) being coupled to a receiver, and the second ends (212, 214) providing loop size adjustment. The reactance buffer (218) comprises a reactance buffer input (206) coupled to the second end of the first (202) antenna segment. A plurality of taps (T1-T7) are linearly disposed along an integrated structure, the structure presenting a substantially flat surface, and having a predetermined length between the outermost taps corresponding to the loop antenna size adjustment required. The taps (T1-T7) provide selectable reactance buffer outputs for coupling to the second end of the second (204) antenna segment. A plurality of reactance elements (302, ..., 320) couple the reactance buffer input (206) to each of the plurality of taps (T1-T7) and provide a substantially constant reactance measured between the reactance buffer input (206) and each of the plurality of taps (T1-T7).
FI913520A 1989-01-23 1991-07-23 REAKTANSBUFFRAD RAMANTENN OCH FOERFARANDE FOER FRAMSTAELLNING DAERAV. FI913520A0 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US29927689A 1989-01-23 1989-01-23
PCT/US1989/005684 WO1990008404A1 (en) 1989-01-23 1989-12-20 Reactance buffered loop antenna and method for making the same

Publications (1)

Publication Number Publication Date
FI913520A0 true FI913520A0 (en) 1991-07-23

Family

ID=23154095

Family Applications (1)

Application Number Title Priority Date Filing Date
FI913520A FI913520A0 (en) 1989-01-23 1991-07-23 REAKTANSBUFFRAD RAMANTENN OCH FOERFARANDE FOER FRAMSTAELLNING DAERAV.

Country Status (11)

Country Link
EP (1) EP0454694B1 (en)
JP (1) JP2588063B2 (en)
KR (1) KR930008833B1 (en)
AT (1) ATE121225T1 (en)
CA (1) CA2004365C (en)
DE (1) DE68922221T2 (en)
DK (1) DK136291D0 (en)
ES (1) ES2070311T3 (en)
FI (1) FI913520A0 (en)
MY (1) MY104488A (en)
WO (1) WO1990008404A1 (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2280065B (en) * 1993-07-16 1997-05-14 Nec Corp Wristwatch-type selective calling receiver
JP2908248B2 (en) * 1993-07-16 1999-06-21 日本電気株式会社 Watch-type selective call receiver
JP3586929B2 (en) * 1995-05-10 2004-11-10 カシオ計算機株式会社 Portable wireless device antenna and portable wireless device
CN112993534B (en) * 2019-12-16 2023-04-07 RealMe重庆移动通信有限公司 Wearable electronic equipment
DE102022134855A1 (en) 2022-12-27 2024-06-27 microsynetics GmbH Fastening strap for a portable computer device

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57142002A (en) * 1981-02-27 1982-09-02 Toshiba Corp Small-sized loop antenna
US4713808A (en) * 1985-11-27 1987-12-15 A T & E Corporation Watch pager system and communication protocol

Also Published As

Publication number Publication date
KR910700550A (en) 1991-03-15
ES2070311T3 (en) 1995-06-01
CA2004365C (en) 1994-05-03
CA2004365A1 (en) 1990-07-23
ATE121225T1 (en) 1995-04-15
DE68922221T2 (en) 1995-11-09
DE68922221D1 (en) 1995-05-18
KR930008833B1 (en) 1993-09-15
WO1990008404A1 (en) 1990-07-26
EP0454694B1 (en) 1995-04-12
EP0454694A4 (en) 1992-06-03
MY104488A (en) 1994-04-30
EP0454694A1 (en) 1991-11-06
JP2588063B2 (en) 1997-03-05
DK136291A (en) 1991-07-16
JPH04504491A (en) 1992-08-06
DK136291D0 (en) 1991-07-16

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Legal Events

Date Code Title Description
FD Application lapsed