JPS5377408A - Communication unit in tunnel and underground - Google Patents

Communication unit in tunnel and underground

Info

Publication number
JPS5377408A
JPS5377408A JP15289376A JP15289376A JPS5377408A JP S5377408 A JPS5377408 A JP S5377408A JP 15289376 A JP15289376 A JP 15289376A JP 15289376 A JP15289376 A JP 15289376A JP S5377408 A JPS5377408 A JP S5377408A
Authority
JP
Japan
Prior art keywords
tunnel
underground
communication unit
small
wave
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
JP15289376A
Other languages
English (en)
Japanese (ja)
Other versions
JPS5645537B2 (online.php
Inventor
Jiro Chiba
Tatsuo Inaba
Yoshitomo Kuwamoto
Osamu Sakano
Risaburo Sato
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.)
Hitachi Ltd
Kokusai Denki Electric Inc
Original Assignee
Hitachi Denshi KK
Hitachi Ltd
Yagi Antenna Co Ltd
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 Hitachi Denshi KK, Hitachi Ltd, Yagi Antenna Co Ltd filed Critical Hitachi Denshi KK
Priority to JP15289376A priority Critical patent/JPS5377408A/ja
Publication of JPS5377408A publication Critical patent/JPS5377408A/ja
Publication of JPS5645537B2 publication Critical patent/JPS5645537B2/ja
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B5/00—Near-field transmission systems, e.g. inductive or capacitive transmission systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B5/00—Near-field transmission systems, e.g. inductive or capacitive transmission systems
    • H04B5/20—Near-field transmission systems, e.g. inductive or capacitive transmission systems characterised by the transmission technique; characterised by the transmission medium
    • H04B5/28—Near-field transmission systems, e.g. inductive or capacitive transmission systems characterised by the transmission technique; characterised by the transmission medium using the near field of leaky cables, e.g. of leaky coaxial cables
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B5/00—Near-field transmission systems, e.g. inductive or capacitive transmission systems
    • H04B5/20—Near-field transmission systems, e.g. inductive or capacitive transmission systems characterised by the transmission technique; characterised by the transmission medium
    • H04B5/24—Inductive coupling
    • H04B5/26—Inductive coupling using coils

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Waveguides (AREA)
  • Waveguide Aerials (AREA)
  • Near-Field Transmission Systems (AREA)
  • Mobile Radio Communication Systems (AREA)
JP15289376A 1976-12-21 1976-12-21 Communication unit in tunnel and underground Granted JPS5377408A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15289376A JPS5377408A (en) 1976-12-21 1976-12-21 Communication unit in tunnel and underground

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15289376A JPS5377408A (en) 1976-12-21 1976-12-21 Communication unit in tunnel and underground

Publications (2)

Publication Number Publication Date
JPS5377408A true JPS5377408A (en) 1978-07-08
JPS5645537B2 JPS5645537B2 (online.php) 1981-10-27

Family

ID=15550421

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15289376A Granted JPS5377408A (en) 1976-12-21 1976-12-21 Communication unit in tunnel and underground

Country Status (1)

Country Link
JP (1) JPS5377408A (online.php)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4020332Y1 (online.php) * 1964-11-09 1965-07-15
JPS5042664U (online.php) * 1973-08-17 1975-04-30
JPS5158886A (online.php) * 1974-11-18 1976-05-22 Matsushita Electric Industrial Co Ltd

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4020332Y1 (online.php) * 1964-11-09 1965-07-15
JPS5042664U (online.php) * 1973-08-17 1975-04-30
JPS5158886A (online.php) * 1974-11-18 1976-05-22 Matsushita Electric Industrial Co Ltd

Also Published As

Publication number Publication date
JPS5645537B2 (online.php) 1981-10-27

Similar Documents

Publication Publication Date Title
JPS5289002A (en) Process for communication
JPS5377408A (en) Communication unit in tunnel and underground
JPS5240045A (en) Antena system for medium wave transmission
JPS52137915A (en) Data transmission system
JPS5377409A (en) Communication method in tunnel and underground
JPS52128005A (en) Informatoon transmitting method
JPS5438705A (en) Data transmission system
JPS52153312A (en) Automatic channel selection transceiver unit
JPS533115A (en) Pcm terminal station unit
JPS5373008A (en) Communication speed matching system
JPS5344788A (en) Transmitter/receiver
JPS52149401A (en) Diversity system in mobile communication
JPS52109318A (en) Data transmitting system utilized multi-vector signal method
JPS5376601A (en) Radiotelephone
JPS547802A (en) Method and apparatus for communication for area surrounded by walls such as tunnel and underground market
JPS5296813A (en) Transbonder for loading satelite
JPS5412503A (en) Optical data link system
JPS5326640A (en) Single-cable separate group transmission system
JPS52126103A (en) Communication method
JPS5387116A (en) Portable radio equipment
JPS5287908A (en) Pam transmission system
JPS53121511A (en) Transmitting/receving system
JPS53886A (en) Expandable tapered wave guide
JPS51140459A (en) Uhf leakage coaxial cable
JPS5340203A (en) Charging pulse transmission system