EP0474440A2 - Transpondeur pour véhicule en mouvement - Google Patents
Transpondeur pour véhicule en mouvement Download PDFInfo
- Publication number
- EP0474440A2 EP0474440A2 EP91307965A EP91307965A EP0474440A2 EP 0474440 A2 EP0474440 A2 EP 0474440A2 EP 91307965 A EP91307965 A EP 91307965A EP 91307965 A EP91307965 A EP 91307965A EP 0474440 A2 EP0474440 A2 EP 0474440A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- transponder
- transmission line
- dipole antenna
- feeder
- substrate
- 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.)
- Withdrawn
Links
Images
Classifications
-
- G—PHYSICS
- G08—SIGNALLING
- G08G—TRAFFIC CONTROL SYSTEMS
- G08G1/00—Traffic control systems for road vehicles
- G08G1/01—Detecting movement of traffic to be counted or controlled
- G08G1/017—Detecting movement of traffic to be counted or controlled identifying vehicles
Definitions
- This invention relates to tag transponders, particularly though not exclusively for attaching to vehicles.
- a system has been devised which allows road toll fees to be collected automatically.
- the system comprises an interrogator device buried in the carriageway and a transponding tag fitted to vehicles.
- transponder tag is intended to mean a unitary device which includes elements necessary for its operation in receiving radiated signals and transmitting signals in response thereto.
- UHF range is intended to mean any frequency below 2 GHz and excluding frequencies which would normally be regarded as microwave.
- the present invention provides a transponder tag operative in the UHF range and including a substrate of dielectric material having formed on one side a conductive surface providing a ground plane and a dipole antenna, a slot line within the ground plane forming a balanced antenna feeder and leading to the centre of the dipole antenna, and the substrate having mounted on the side of the substrate opposite to said one side a transmission line feeder positioned for electromagnetic coupling with said slot line, the transmission line feeder being coupled to transceiver circuit means and processing means mounted on the opposite side for performing a transponding function.
- a transponder of particularly simple construction operating in the UHF range including an antenna and balanced feeder arrangement formed in a particularly simple manner on opposite sides of a dielectric substrate.
- the dipole antenna is formed by removing for example by etching selected parts of said conductive surface, leaving a strip defining a dipole antenna which is connected to the ground plane at the central region of the strip.
- the transmission line feeder comprises a conductive strip, /4 long and terminating at a position generally opposite the slot line for maximum coupling to the slot line.
- the transceiver means comprises an oscillator coupled via a buffer (power) amplifier to the transmission line feeder, the collector of an RF transistor of the amplifier being directly coupled to the feeder.
- the oscillator and amplifier are CW modulated by switching of the power supplied to the oscillator and amplifier by means of output data signals from the processor.
- the receiver is capacitively coupled to the feeder with the base of a receiver transistor being directly connected to the AC coupling.
- the receiver demodulates received RF signals and provides the demodulated data to the processing means, which preferably comprises a processor and memory including stored programs, all provided in a single ASIC.
- FIG. 1 is a block diagram of the tag according to the invention and shows a dipole antenna 2 coupled via an antenna coupler 6 to a receiver detector 8 which demodulates data received by the antenna and passes the demodulated data to a data processor 10 formed as an ASIC.
- Output data provided by processor 10 is coupled to an RF oscillator 12 which oscillates a 915 MHz and to a buffer (power) amplifier 14 which amplifies the oscillator signals and feeds the signals to antenna coupler 6.
- the data on output line 16 from processor 10 modulates the oscillator and buffer amplifer in a CW modulation mode wherein both the oscillator and amplifier are switched on/off directly by the output data.
- this is a plan view of the tag transponder comprising a substrate block 30 a relatively low dielectric value polyester resin and having on its upper side a conductive surface 32 (for example copper) coated thereon.
- the surface 32 forms a ground plane and portions of the surface 32 are removed as at 34 to provide on one side of the surface a dipole antenna strip 36 having an input impedance of 75 ohms at its centre.
- a slot line 38 is formed in the ground plane extending from the mid point of the antenna 36 and forming a right angled bend as at 40.
- the electrical components indicated in Figure 1 are mounted as at 42, preferably by means of surface mount technology on an array of solder bumps.
- Transmission line 44 is formed as a strip of conductive metal coated on dielectric block 30 and having a length ⁇ /4 with the free end of the strip 46 terminating close to a position directly opposite slot line 38.
- the end of strip 46 is coupled via a capacitive coupling 48 to ground plane 42. This arrangement provides a maximum electromagnetic coupling between the end of strip 46 and slot line 40, the radiation being coupled to slot line 40 and then being conductive in a balanced feed arrangement on either side of the slot line to the dipole antenna to provide a balanced feed to the dipole antenna.
- the dipole antenna is printed on the same PWB (printed wiring board) as the tag electronics.
- this shows a circuit diagram of the transceiver arrangement as comprising a receiver or detector 50 coupled to transmission line 44 via a capacitance 52, the base of an RF detector transistor 54 being directly coupled to capacitor 52.
- the collector of transistor 54 is coupled to the base and, via a diode 56, to the emitter of a further transistor 58.
- a tuning circuit for the detector is formed by the quarter-wave transmission line 44, while transistors 65, 66, capacitor C1 and inductor L1 provide active bias for the detector transistor 54.
- the combination of transistor 54 diode 56 and transistor 58 provide a means of demodulating the data from the input RF signal and the demodulated data is fed to processor 10.
- Processor 10 responds to the input data by providing data on output line 16 for modulation of an oscillator 12 comprising a transistor 60 and a resonant circuit arrangement L2, C3, C4, the frequency of oscillation being determined by a micro strip 62.
- the oscillator is coupled to buffer amplifier 14 comprising an RF transistor 64 coupled in common base mode to oscillator 12 and having its collector directly coupled to feeder 44.
- the processor circuit 10 is powered by a lithium battery (not shown) and the battery and transponder tag are housed in an overall plastics encapsulation.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB9019645 | 1990-09-07 | ||
GB909019645A GB9019645D0 (en) | 1990-09-07 | 1990-09-07 | Moving vehicle transponder |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0474440A2 true EP0474440A2 (fr) | 1992-03-11 |
EP0474440A3 EP0474440A3 (en) | 1993-07-07 |
Family
ID=10681879
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19910307965 Withdrawn EP0474440A3 (en) | 1990-09-07 | 1991-08-30 | Moving vehicle transponder |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0474440A3 (fr) |
CA (1) | CA2050832A1 (fr) |
GB (2) | GB9019645D0 (fr) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR100603617B1 (ko) | 2004-06-29 | 2006-07-24 | 한국전자통신연구원 | 전파식별 송수신용 안테나 및 그를 이용한 트랜스폰더 |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2017166307A1 (fr) | 2016-04-01 | 2017-10-05 | 深圳市大疆创新科技有限公司 | Antenne, ensemble de communication et aéronef sans pilote |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1348478A (en) * | 1970-06-20 | 1974-03-20 | Emi Ltd | Aerial arrangements |
US3845490A (en) * | 1973-05-03 | 1974-10-29 | Gen Electric | Stripline slotted balun dipole antenna |
US4068232A (en) * | 1976-02-12 | 1978-01-10 | Fairchild Industries, Inc. | Passive encoding microwave transponder |
US4104630A (en) * | 1976-06-21 | 1978-08-01 | Chasek Norman E | Vehicle identification system, using microwaves |
EP0323011A2 (fr) * | 1987-12-18 | 1989-07-05 | Amtech Technology Corporation | Antenne avec transpondeur |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2487588A1 (fr) * | 1980-07-23 | 1982-01-29 | France Etat | Doublets replies en plaques pour tres haute frequence et reseaux de tels doublets |
-
1990
- 1990-09-07 GB GB909019645A patent/GB9019645D0/en active Pending
-
1991
- 1991-08-30 GB GB9118647A patent/GB2249924B/en not_active Expired - Fee Related
- 1991-08-30 EP EP19910307965 patent/EP0474440A3/en not_active Withdrawn
- 1991-09-06 CA CA 2050832 patent/CA2050832A1/fr not_active Abandoned
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1348478A (en) * | 1970-06-20 | 1974-03-20 | Emi Ltd | Aerial arrangements |
US3845490A (en) * | 1973-05-03 | 1974-10-29 | Gen Electric | Stripline slotted balun dipole antenna |
US4068232A (en) * | 1976-02-12 | 1978-01-10 | Fairchild Industries, Inc. | Passive encoding microwave transponder |
US4104630A (en) * | 1976-06-21 | 1978-08-01 | Chasek Norman E | Vehicle identification system, using microwaves |
EP0323011A2 (fr) * | 1987-12-18 | 1989-07-05 | Amtech Technology Corporation | Antenne avec transpondeur |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR100603617B1 (ko) | 2004-06-29 | 2006-07-24 | 한국전자통신연구원 | 전파식별 송수신용 안테나 및 그를 이용한 트랜스폰더 |
Also Published As
Publication number | Publication date |
---|---|
GB9118647D0 (en) | 1991-10-16 |
GB2249924A (en) | 1992-05-20 |
GB2249924B (en) | 1994-06-15 |
EP0474440A3 (en) | 1993-07-07 |
CA2050832A1 (fr) | 1992-03-08 |
GB9019645D0 (en) | 1990-10-24 |
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Legal Events
Date | Code | Title | Description |
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PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
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AK | Designated contracting states |
Kind code of ref document: A2 Designated state(s): AT BE CH DE DK ES FR GB GR IT LI LU NL SE |
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RBV | Designated contracting states (corrected) |
Designated state(s): DE ES FR IT NL SE |
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RAP1 | Party data changed (applicant data changed or rights of an application transferred) |
Owner name: PLESSEY SEMICONDUCTORS LIMITED |
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PUAL | Search report despatched |
Free format text: ORIGINAL CODE: 0009013 |
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AK | Designated contracting states |
Kind code of ref document: A3 Designated state(s): AT BE CH DE DK ES FR GB GR IT LI LU NL SE |
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17P | Request for examination filed |
Effective date: 19931217 |
|
17Q | First examination report despatched |
Effective date: 19960708 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
|
18D | Application deemed to be withdrawn |
Effective date: 19961119 |