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JPS575445A - Antenna device - Google Patents

Antenna device

Info

Publication number
JPS575445A
JPS575445A JP8205480A JP8205480A JPS575445A JP S575445 A JPS575445 A JP S575445A JP 8205480 A JP8205480 A JP 8205480A JP 8205480 A JP8205480 A JP 8205480A JP S575445 A JPS575445 A JP S575445A
Authority
JP
Japan
Prior art keywords
antenna element
antenna
receiver
lowered
control circuit
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.)
Pending
Application number
JP8205480A
Other languages
Japanese (ja)
Inventor
Yasunori Yokoyama
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.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
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 Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP8205480A priority Critical patent/JPS575445A/en
Publication of JPS575445A publication Critical patent/JPS575445A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
    • H04B7/0802—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using antenna selection
    • H04B7/0805—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using antenna selection with single receiver and antenna switching
    • H04B7/0814—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using antenna selection with single receiver and antenna switching based on current reception conditions, e.g. switching to different antenna when signal level is below threshold

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Radio Transmission System (AREA)

Abstract

PURPOSE:To form a device by a space diversity system without requiring two sets of receivers, by making transmission and reception with one of two antenna elements and switching the performance to another antenna element if the received input is lowered. CONSTITUTION:Two antenna elements 1-1, 1-2 are installed at prescribed intervals (d). For exmple, a transmitter 4 and a receiver 5 are connected to the 1st antenna element 1-1, and if a squeltch circuit for the receiver 5 is operated through lowered reception inputs due to a weak electric field during communication, a signal indicating the operation is given to a control circuit 6. If this state keeps for a prescribed time, an antenna changeover device 2 is switched with the control circuit 6, the 2nd antenna element 1-2 is selected and the state possible for the communication is restored.
JP8205480A 1980-06-13 1980-06-13 Antenna device Pending JPS575445A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8205480A JPS575445A (en) 1980-06-13 1980-06-13 Antenna device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8205480A JPS575445A (en) 1980-06-13 1980-06-13 Antenna device

Publications (1)

Publication Number Publication Date
JPS575445A true JPS575445A (en) 1982-01-12

Family

ID=13763792

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8205480A Pending JPS575445A (en) 1980-06-13 1980-06-13 Antenna device

Country Status (1)

Country Link
JP (1) JPS575445A (en)

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