CA2004365A1 - Reactance buffered loop antenna and method for making the same - Google Patents

Reactance buffered loop antenna and method for making the same

Info

Publication number
CA2004365A1
CA2004365A1 CA2004365A CA2004365A CA2004365A1 CA 2004365 A1 CA2004365 A1 CA 2004365A1 CA 2004365 A CA2004365 A CA 2004365A CA 2004365 A CA2004365 A CA 2004365A CA 2004365 A1 CA2004365 A1 CA 2004365A1
Authority
CA
Canada
Prior art keywords
reactance
taps
antenna
loop antenna
reactance buffer
Prior art date
Legal status (The legal status 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 status listed.)
Granted
Application number
CA2004365A
Other languages
French (fr)
Other versions
CA2004365C (en
Inventor
William Tan
Robert Kurcbart
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Motorola Solutions Inc
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 CA2004365A1 publication Critical patent/CA2004365A1/en
Application granted granted Critical
Publication of CA2004365C publication Critical patent/CA2004365C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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)
  • Variable-Direction Aerials And Aerial Arrays (AREA)
  • Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)
  • Support Of Aerials (AREA)
  • Aerials With Secondary Devices (AREA)
  • Microscoopes, Condenser (AREA)
  • Investigating, Analyzing Materials By Fluorescence Or Luminescence (AREA)
  • Luminescent Compositions (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).
CA002004365A 1989-01-23 1989-12-01 Reactance buffered loop antenna and method for making the same Expired - Fee Related CA2004365C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US29927689A 1989-01-23 1989-01-23
US299,276 1989-01-23

Publications (2)

Publication Number Publication Date
CA2004365A1 true CA2004365A1 (en) 1990-07-23
CA2004365C CA2004365C (en) 1994-05-03

Family

ID=23154095

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002004365A Expired - Fee Related CA2004365C (en) 1989-01-23 1989-12-01 Reactance buffered loop antenna and method for making the same

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
ES2070311T3 (en) 1995-06-01
WO1990008404A1 (en) 1990-07-26
DE68922221T2 (en) 1995-11-09
DK136291A (en) 1991-07-16
DK136291D0 (en) 1991-07-16
EP0454694B1 (en) 1995-04-12
KR930008833B1 (en) 1993-09-15
FI913520A0 (en) 1991-07-23
KR910700550A (en) 1991-03-15
EP0454694A4 (en) 1992-06-03
DE68922221D1 (en) 1995-05-18
CA2004365C (en) 1994-05-03
MY104488A (en) 1994-04-30
JPH04504491A (en) 1992-08-06
ATE121225T1 (en) 1995-04-15
JP2588063B2 (en) 1997-03-05
EP0454694A1 (en) 1991-11-06

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Legal Events

Date Code Title Description
EEER Examination request
MKLA Lapsed