CA2025758A1 - Single-Block Filter for Antenna Duplexing and Antenna-Switched Diversity - Google Patents
Single-Block Filter for Antenna Duplexing and Antenna-Switched DiversityInfo
- Publication number
- CA2025758A1 CA2025758A1 CA2025758A CA2025758A CA2025758A1 CA 2025758 A1 CA2025758 A1 CA 2025758A1 CA 2025758 A CA2025758 A CA 2025758A CA 2025758 A CA2025758 A CA 2025758A CA 2025758 A1 CA2025758 A1 CA 2025758A1
- Authority
- CA
- Canada
- Prior art keywords
- antenna
- antennas
- filter
- duplexing
- coupled
- 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
Links
Landscapes
- Control Of Motors That Do Not Use Commutators (AREA)
- Radio Transmission System (AREA)
- Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
- Waveguide Switches, Polarizers, And Phase Shifters (AREA)
- Transceivers (AREA)
Abstract
SINGLE-BLOCK FILTER FOR ANTENNA
DUPLEXING AND ANTENNA-SWITCHED 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-switched diversity in a duplex radio transceiver (100). One antenna (142) is coupled by the filter (102) to a transmitter (132), and both antennas (142 and 144) are switchably coupled by the filter (102) to a 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 one of 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) to the other one of the antennas (142 or 144).
DUPLEXING AND ANTENNA-SWITCHED 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-switched diversity in a duplex radio transceiver (100). One antenna (142) is coupled by the filter (102) to a transmitter (132), and both antennas (142 and 144) are switchably coupled by the filter (102) to a 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 one of 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) to the other one of the antennas (142 or 144).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US42825389A | 1989-10-27 | 1989-10-27 | |
| US428,253 | 1989-10-27 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2025758A1 true CA2025758A1 (en) | 1991-04-28 |
| CA2025758C CA2025758C (en) | 1994-07-12 |
Family
ID=23698120
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002025758A Expired - Fee Related CA2025758C (en) | 1989-10-27 | 1990-09-19 | Single-block filter for antenna duplexing and antenna-switched diversity |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP2602121B2 (en) |
| CA (1) | CA2025758C (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003060408A (en) * | 2001-06-05 | 2003-02-28 | Murata Mfg Co Ltd | Filter component and communication apparatus |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61179603A (en) * | 1985-02-04 | 1986-08-12 | Murata Mfg Co Ltd | Distributed constant type dielectric resonator |
| JPS6340009U (en) * | 1986-09-02 | 1988-03-15 | ||
| JPS63174402A (en) * | 1987-01-13 | 1988-07-18 | Murata Mfg Co Ltd | Dielectric filter device |
-
1990
- 1990-09-19 CA CA002025758A patent/CA2025758C/en not_active Expired - Fee Related
- 1990-10-09 JP JP2272097A patent/JP2602121B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH03147401A (en) | 1991-06-24 |
| CA2025758C (en) | 1994-07-12 |
| JP2602121B2 (en) | 1997-04-23 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKLA | Lapsed |