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CA2022278A1 - Single-block filter for antenna duplexing and antenna-summed diversity - Google Patents

Single-block filter for antenna duplexing and antenna-summed diversity

Info

Publication number
CA2022278A1
CA2022278A1 CA2022278A CA2022278A CA2022278A1 CA 2022278 A1 CA2022278 A1 CA 2022278A1 CA 2022278 A CA2022278 A CA 2022278A CA 2022278 A CA2022278 A CA 2022278A CA 2022278 A1 CA2022278 A1 CA 2022278A1
Authority
CA
Canada
Prior art keywords
antenna
diversity
summed
receiver
duplexing
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
CA2022278A
Other languages
French (fr)
Other versions
CA2022278C (en
Inventor
Richard S. Kommrusch
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
Priority claimed from US07/453,553 external-priority patent/US5020093A/en
Application filed by Motorola Inc filed Critical Motorola Inc
Publication of CA2022278A1 publication Critical patent/CA2022278A1/en
Application granted granted Critical
Publication of CA2022278C publication Critical patent/CA2022278C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Landscapes

  • Radio Transmission System (AREA)
  • Control Of Motors That Do Not Use Commutators (AREA)

Abstract

SINGLE-BLOCK FILTER FOR ANTENNA
DUPLEXING AND ANTENNA-SUMMED DIVERSITY

Abstract of the Disclosure A single-block ceramic filter (102) is coupled to two antennas (142 and 144) for providing both antenna duplexing and antenna-summed diversity in a duplex radio transceiver (100). One antenna (142) is coupled by the filter (102) to a transmitter (132) and to a receiver (130), and a second antenna (144) is switchably coupled by the filter (102) to the receiver (130) by diversity control circuitry (101) in response to a diversity control signal (137). A microcomputer (134) in the transceiver (100) is coupled to the receiver (130) for monitoring the received signal strength (135). When the received signal strength (135) drops in level indicating that the signal being received on the antennas (142 or 144) has become degraded due to fading or other interference, the microcomputer (134) changes the binary state of the diversity control signal (137) for switching the receiver (130) between antenna (142) and both antennas (142 and 144).
CA 2022278 1989-10-27 1990-07-30 Single-block filter for antenna duplexing and antenna-summed diversity Expired - Fee Related CA2022278C (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US42814689A 1989-10-27 1989-10-27
US428,146 1989-10-27
US07/453,553 US5020093A (en) 1989-06-23 1989-12-20 Cellular telephone operable on different cellular telephone systems
US453,553 1989-12-20

Publications (2)

Publication Number Publication Date
CA2022278A1 true CA2022278A1 (en) 1991-04-28
CA2022278C CA2022278C (en) 1993-12-21

Family

ID=27027642

Family Applications (1)

Application Number Title Priority Date Filing Date
CA 2022278 Expired - Fee Related CA2022278C (en) 1989-10-27 1990-07-30 Single-block filter for antenna duplexing and antenna-summed diversity

Country Status (1)

Country Link
CA (1) CA2022278C (en)

Also Published As

Publication number Publication date
CA2022278C (en) 1993-12-21

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Legal Events

Date Code Title Description
EEER Examination request
MKLA Lapsed