Back to results
US 2002/0171549 A1Published application
Reflection multiplier radio wave marker, marker sensor, marker system and traffic system
OwnerYoshihiko Tanji, Satoru Handa +1inventors
InventorsYoshihiko Tanji, Satoru Handa, Akira Nakatsuka
Life of this patent
Estimating the term…
Abstract
A reflection multiplier radio wave marker, the transmit antenna of which is comprised of a coil either one of two types, wound clockwise or anti-clockwise, so that the transmit electric wave can be reversed in phase by approximately 180°. A marker system and a traffic system using the marker are also disclosed in the present invention.
Claims20
A reflection multiplier radio wave marker comprising:
- a first receive antenna of an approximate rod shape for receiving electric wave of first frequency;
- a frequency conversion circuit connected to said first receive antenna for multiplying the frequency of received signal;
- and
- a transmit antenna of an approximate disc shape for reflecting the electric wave which has been multiplied to a second frequency by said frequency conversion circuit, wherein
- said transmit antenna is disposed on and in parallel to a plane containing said first receive antenna so that receiving electric wave and transmitting electric wave cross at right angle,
- said transmit antenna is formed of a coil either one of two types, wound clockwise or anti-clockwise, so that the transmit electric wave can be reversed in phase by approximately 180°, and
- said first receive antenna, said transmit antenna and said frequency conversion circuit are housed in a case made of a nonmagnetic material.
4 more elements
A reflection multiplier radio wave marker comprising:
- a first receive antenna of an approximate rod shape for receiving electric wave of first frequency;
- a frequency conversion circuit connected to said first receive antenna for multiplying the frequency of received signal;
- and
- a transmit antenna of an approximate disc shape for reflecting the electric wave which has been multiplied to a second frequency by said frequency conversion circuit, wherein,
- said transmit antenna is disposed on and in parallel to a plane containing said first receive antenna so that receiving electric wave and transmitting electric wave cross at right angle,
- said transmit antenna is formed of either one of said two types of coils disposed in a posture up/down reversed so that the transmit electric wave can be reversed in phase by approximately 180°, and
- said first receive antenna, said transmit antenna and said frequency conversion circuit are housed in a case made of a nonmagnetic material.
4 more elements
A marker sensor comprising:
- a second receive antenna for receiving electric waves transmitted from a plurality of reflection multiplier radio wave markers, which electric waves being transmitted in phases different by approximately 180° to each other;
- and
- a phase detector for detecting the phase, positive or negative, of electric wave received by said second receive antenna.
A system of reflection multiplier radio wave markers comprising:
- a reflection multiplier radio wave marker, which comprises
- a first receive antenna of an approximate rod shape for receiving electric wave of first frequency;
- a frequency conversion circuit connected to said first receive antenna for multiplying the frequency of received signal;
- and
- a transmit antenna of an approximate disc shape for reflecting the electric wave, which has been multiplied to a second frequency by said frequency conversion circuit, wherein
- said transmit antenna is disposed on and in parallel to a plane containing said first receive antenna so that receiving electric wave and transmitting electric wave cross at right angle,
- said transmit antenna has a coil either one of two types, wound clockwise or anti-clockwise, so that the transmit electric wave can be reversed in phase by approximately 180°, and
- said first receive antenna, said transmit antenna and said frequency conversion circuit are housed in a case made of a nonmagnetic material;
- and
- a marker sensor including:
- a second receive antenna for receiving electric waves transmitted from a plurality of reflection multiplier radio wave markers, which electric waves being transmitted in phases different by approximately 180° to each other;
- and
- a phase detector for detecting the phase, positive or negative, of electric wave received by said second receive antenna.
10 more elements
A system of reflection multiplier radio wave markers comprising:
- a reflection multiplier radio wave marker including:
- a first receive antenna of an approximate rod shape for receiving electric wave of first frequency;
- a frequency conversion circuit connected to said first receive antenna for multiplying the frequency of received signal;
- and
- a transmit antenna of an approximate disc shape for reflecting the electric wave, which has been multiplied to a second frequency by said frequency conversion circuit, wherein
- said transmit antenna is disposed on and in parallel to a plane containing said first receive antenna so that receiving electric wave and transmitting electric wave cross at right angle,
- said transmit antenna is formed of either one of said two types of coils disposed in a posture up/down reversed so that the transmit electric wave can be reversed in phase by approximately 180°, and
- said first receive antenna, said transmit antenna and said frequency conversion circuit are housed in a case made of a nonmagnetic material;
- and
- a marker sensor including:
- a second receive antenna for receiving electric waves transmitted from a plurality of reflection multiplier radio wave markers, which electric wave being transmitted in phases different by approximately 180° to each other;
- and
- a phase detector for detecting the phase, positive or negative, of electric wave received by said second receive antenna.
10 more elements
A traffic system comprising:
- a system of reflection multiplier radio wave markers including:
- a reflection multiplier radio wave marker, which comprises
- a first receive antenna of an approximate rod shape for receiving electric wave of first frequency,
- a frequency conversion circuit connected to said first receive antenna for multiplying the frequency of received signal, and
- a transmit antenna of an approximate disc shape for reflecting the electric wave which has been multiplied to a second frequency by said frequency conversion circuit, wherein
- said transmit antenna is disposed on and in parallel to a plane containing said first receive antenna so that receiving electric wave and transmitting electric wave cross at right angle,
- said transmit antenna has a coil either one of two types, wound clockwise or anti-clockwise, so that the transmit electric wave can be reversed in phase by approximately 180°, and
- said first receive antenna, said transmit antenna and said frequency conversion circuit are housed in a case made of a nonmagnetic material;
- and
- a marker sensor, which comprises
- a second receive antenna for receiving electric waves transmitted from a plurality of reflection multiplier radio wave markers, which electric wave being transmitted in phases different by approximately 180° to each other,
- a phase detector for detecting the phase, positive or negative, of electric wave received by said second receive antenna, and
- a phase type output section which outputs information about phase type based on the phase difference detected at said phase detector.
10 more elements
A traffic system comprising:
- a system of reflection multiplier radio wave markers including:
- a reflection multiplier radio wave marker, which comprises
- a first receive antenna of an approximate rod shape for receiving electric wave of first frequency,
- a frequency conversion circuit connected to said first receive antenna for multiplying the frequency of received signal, and
- a transmit antenna of an approximate disc shape for reflecting the electric wave which has been multiplied to a second frequency by said frequency conversion circuit, wherein
- said transmit antenna is disposed on and in parallel to a plane containing said first receive antenna so that receiving electric wave and transmitting electric wave cross at right angle,
- said transmit antenna is formed of either one of said two types of coils disposed in a posture up/down reversed so that the transmit electric wave can be reversed in phase by approximately 180°, and
- said first receive antenna, said transmit antenna and said frequency conversion circuit are housed in a case made of a nonmagnetic material;
- and
- a marker sensor, which comprises
- a second receive antenna for receiving electric waves transmitted from a plurality of reflection multiplier radio wave markers, which electric wave being transmitted in phases different by approximately 180° to each other,
- a phase detector for detecting the phase, positive or negative, of electric wave received by said second receive antenna, and
- a phase type output section which outputs information about phase type based on the phase difference detected at said phase detector.
10 more elements
Dependencies are inferred from the claim text.