CN114124147B - Miniaturized transponder - Google Patents
Miniaturized transponder Download PDFInfo
- Publication number
- CN114124147B CN114124147B CN202111448937.1A CN202111448937A CN114124147B CN 114124147 B CN114124147 B CN 114124147B CN 202111448937 A CN202111448937 A CN 202111448937A CN 114124147 B CN114124147 B CN 114124147B
- Authority
- CN
- China
- Prior art keywords
- transponder
- miniaturized
- btm
- coil
- train
- 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.)
- Active
Links
- 230000009471 action Effects 0.000 claims abstract description 19
- 230000000694 effects Effects 0.000 claims description 5
- 230000003750 conditioning effect Effects 0.000 claims description 3
- 238000004891 communication Methods 0.000 claims description 2
- 230000008901 benefit Effects 0.000 abstract description 4
- 239000003990 capacitor Substances 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 13
- 230000005672 electromagnetic field Effects 0.000 description 6
- 230000008878 coupling Effects 0.000 description 5
- 238000010168 coupling process Methods 0.000 description 5
- 238000005859 coupling reaction Methods 0.000 description 5
- 238000013461 design Methods 0.000 description 5
- 230000006870 function Effects 0.000 description 5
- 238000013459 approach Methods 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 230000008859 change Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/59—Responders; Transponders
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
- H04B1/3822—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving specially adapted for use in vehicles
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
- H04B1/40—Circuits
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Train Traffic Observation, Control, And Security (AREA)
Abstract
In the miniaturized transponder, a resonance coil is added between a BTM coil and a main coil of the transponder, devices such as a matching capacitor and an inductor are tuned, the transponder is of a double-layer coil structure, and a focusing ring is arranged in a shell of the transponder; compared with the conventional transponder, the size of the miniaturized transponder is greatly reduced, and the minimum mounting distance between every two transponders is 1 meter, so that the requirement of dense mounting is met; the action range of the miniaturized transponder relative to the BTM antenna is about 600mm, the existing transponder level is achieved, and the application of the train at the speed of 400km/h at maximum is met. The invention has the technical advantages that: the miniaturized transponder of the invention has low cost, small volume and light weight, has similar performance to the existing transponder, meets the application of the train at the speed of 400km/h at maximum, can directly replace the conventional transponder, and can also be densely installed to form a transponder array.
Description
Technical Field
The invention relates to the field of automatic train control, in particular to a miniaturized transponder device.
Background
The European standard transponder is widely applied to large-scale railway and subway projects at present, is communicated with vehicle-mounted equipment and ground equipment to form a transponder transmission system, is used for running line information of vehicles, and achieves the function of vehicle positioning. With the development of technology, new transponder application needs are continuously emerging, for example, the transponder arrangement density needs to be increased within a certain range, so as to realize accurate positioning of a train. For another example, a new type of vehicle-to-ground information transmission system requires a large number of high density active transponders to be deployed, through which a large amount of information is sent to the vehicle-mounted BTM to perform the function of transmitting information from the ground to the train. This requires that the transponder be of a smaller volume and be capable of being densely mounted. In order to meet the related standards, the existing transponders are limited to 5 meters in the shortest distance between every two transponders, and obviously cannot meet the requirements.
At the same time, as the number of transponders installed on rail increases year by year, users of the road segments and the like have more demands for reduced transponder costs. The field construction party and the transportation party also put forward the demands of miniaturization and light weight on the problems of larger size and heavier weight of the existing transponder.
Disclosure of Invention
The invention provides a small, lightweight, low cost transponder device.
The invention provides a miniaturized transponder, which is characterized in that a resonance coil is added between a BTM coil and a transponder main coil, and devices such as a matching capacitor and an inductor are used for tuning, and the device is called a focusing ring;
the transponder is of a double-layer coil structure, the focusing ring is arranged in the transponder shell, forms a focusing effect with the main coil of the transponder, and is tuned to 27.095Mhz for resonance through matching inductance-capacitance elements and the like;
under the action of the focusing ring, the transponder can obtain electromagnetic wave energy required by work in a larger range;
compared with the conventional transponder, the size of the miniaturized transponder is greatly reduced, and the minimum mounting distance between every two transponders is 1 meter, so that the requirement of dense mounting is met;
the action range of the miniaturized transponder relative to the BTM antenna is about 600mm, the existing transponder level is achieved, and the application of the train at the highest speed of 400km/h is met.
The invention has the technical advantages that: the miniaturized transponder of the invention has low cost, small volume, light weight, convenient transportation and installation, has the performance similar to the existing transponder, meets the application of the train at the speed of up to 400km/h, can directly replace the conventional transponder (including an active transponder and a passive transponder), and can also be densely installed to form a transponder array.
Drawings
[1] FIG. 1 is a schematic diagram of a vehicle-mounted BTM antenna and a ground transponder
[2] FIG. 2 (a) is a schematic diagram of the effective range of the BTM antenna and the existing transponder
[3] FIG. 2 (b) is a schematic diagram showing the effective range of the BTM antenna and the small transponder of the present invention
[4] FIG. 3 is a schematic diagram of a conventional transponder coil structure
[5] FIG. 4 is a schematic diagram of a coil structure of a miniaturized transponder according to the present invention
[6] FIG. 5 is a schematic diagram of the internal functional modules of an existing transponder
[7] FIG. 6 is a schematic diagram of the functional module of the miniature transponder according to the present invention
[8] FIG. 7 is a schematic diagram of an existing transponder field application scenario
[9] FIG. 8 is a schematic diagram of a field application scenario of a passive miniaturized transponder of the present invention
[10] FIG. 9 is a schematic diagram of an active miniaturized transponder field application scenario of the present invention
Reference numeral 1-transponder main coil, 2-focus ring, 3-transponder housing
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings. The following description will assist those skilled in the art in further understanding the invention, but is not intended to limit the invention in any way. It should be noted that variations and modifications can be made by those skilled in the art without departing from the inventive concept, which fall within the scope of the present invention.
The action range of the transponder means that when a train moves and approaches the ground transponder, an electromagnetic coupling relation is gradually formed between the vehicle-mounted BTM antenna and the ground transponder, when the coupling relation is strong to a certain degree, the ground transponder can sense the energy emitted by the BTM antenna and start to work until the train is far away, the coupling relation is weakened, and the transponder stops working. The range of movement of the vehicle-mounted BTM antenna from the beginning of the transponder operation to the stopping of the transponder operation is the range of action between the two. According to the relevant standard, the time for the transponder to transmit a message data from the surface to the BTM antenna is 1.8ms. The vehicle-mounted BTM system adopts a redundant design for ensuring the safety of train operation, at least 3 messages must be received to correctly decode the message information of the transponder, namely the acting time is at least 1.8x2=5.4 ms, otherwise, the BTM cannot identify the transponder, and the alarm of losing the transponder can be sent to the train, so that the train is slowed down and even braked urgently, and safety threat is brought to train passengers. To meet the 5.4ms message sending time under the running condition of 400km/h speed of the train, the action range w=time x speed=5.4x400/3.6=600 mm is calculated.
A schematic diagram of the mode of operation of the vehicle BTM antenna and transponder is shown in fig. 1. The BTM device is installed in the train cab, and the BTM power amplifier is connected to the BTM antenna at the bottom of the train through a dedicated cable. The BTM power amplifier outputs 27.095Mhz signals during train operation and transmits the signals to the ground through the BTM antenna. A ground transponder is installed at a location defined by the railroad section. When the train passes through the transponder, the vehicle-mounted BTM antenna gradually approaches the transponder, and the electromagnetic coupling between the vehicle-mounted BTM antenna and the transponder is gradually enhanced until the transponder receives 27.095Mhz electromagnetic wave emitted by the BTM antenna and the intensity is enough to meet the requirement of the operation of the internal circuit of the transponder, and the vehicle-mounted BTM antenna and the transponder enter the action range of the BTM antenna and the transponder at the moment, and the transponder starts to emit FSK signals containing message data to the antenna. The train continues to travel and the BTM antenna is coupled most strongly when it moves directly over the transponder. When the train continues to move forward and the BTM antenna starts to be far away from the transponder, the coupling between the BTM antenna and the antenna continuously weakens, and a state that the energy of the transponder coupled to the BTM antenna is insufficient to support the operation of an internal circuit can occur at a certain position, at the moment, the transponder stops transmitting FSK signals to the antenna, and at the moment, the transponder leaves the action range of the BTM antenna and the transponder.
The miniaturized transponder of the present invention has a size of 100mmx200mm, in contrast to a conventional transponder having a size of 230mmx420mm. The size of the miniaturized transponder is greatly reduced, and if the conventional design is adopted, the action range is inevitably also greatly reduced. The size of the receiving coil of the miniaturized transponder is reduced, and enough energy emitted by the BTM antenna cannot be received by adopting conventional design, so that the novel coil structure is designed to meet the requirement of 400km/h speed of a train. The design method aims at adding a resonance coil between the BTM coil and the main coil of the transponder, and tuning a device matching capacitance and inductance, which is called a focusing ring. The focusing ring has the function of generating a focusing effect on electromagnetic waves between the transmitting coil of the BTM antenna and the receiving coil of the transponder, and improving the electromagnetic field density in the action range, so that the shape of the radiated electromagnetic field is changed, the radiated electromagnetic field is more directional, the receiving capability of the transponder on the electromagnetic field of the BTM antenna can be finally improved, and the action range is enlarged. The invention designs a focusing ring 2 and is arranged between the BTM antenna and the transponder, under the action of the focusing ring, the focusing effect similar to that of a convex lens is generated, the electromagnetic field under the BTM antenna has obvious density change, and the invention has the benefit that the transponder can receive electromagnetic waves with enough intensity in a larger range to maintain the operation of an internal circuit through test and test.
The existing transponder coil structure is shown in fig. 3, and the single coil structure is provided with a transponder main coil 1, and the components such as inductance, capacitance and the like are well matched with 27.095 Mhz. The effective range of action between the two is shown in figure 2 (a). The BTM antenna emits electromagnetic waves downward and around, the electromagnetic field is evenly distributed, and the transponder is able to receive electromagnetic waves of sufficient strength in the vicinity immediately below the BTM antenna to maintain operation of the internal circuitry.
Whereas the miniaturized transponder coil structure of the present invention is shown in fig. 4, a double-layer coil structure, a transponder focusing ring 2 is mounted in a transponder housing 3, forming a focusing effect with a transponder main coil 1. The focus ring 2 and the main coil 1 are tuned to 27.095Mhz to resonate by matching inductance and capacitance. When the vehicle-mounted BTM antenna approaches the transponder, the focusing ring 2 focuses the received 27.095Mhz electromagnetic wave, so that the density of the received 27.095Mhz electromagnetic wave on the main coil 1 is increased, the transponder obtains more energy, and FSK signals start to be transmitted to the BTM antenna. Under the action of the focusing ring 2, the transponder is able to obtain electromagnetic wave energy required for operation over a larger range, the effective range of action between the two being schematically shown in fig. 2 (b).
The existing transponder size is 230x420mm and the range of action relative to a BTM antenna is about 600mm. After the focusing ring structure is used, the action range of the miniaturized transponder is about 600mm relative to the BTM antenna, so that the similar level of the existing transponder is achieved, and the application of the train at the highest speed of 400km/h is met.
A schematic diagram of the internal functional modules of the existing transponder is shown in fig. 5. The workflow of each module is as follows:
1) The 27Mhz receiving circuit comprises a 27Mhz coil for receiving energy emitted by the BTM antenna and converting the energy into a direct current power supply and a clock frequency required by the working of the transponder;
2) The main control circuit reads the message data in the message memory, modulates the message data into an FSK signal and outputs the FSK signal to the FSK transmitting circuit;
3) The FSK transmitting circuit transmits FSK signals to the vehicle-mounted BTM antenna;
4) When changing the message, the 9Mhz receiving circuit is used for receiving the 9Mhz signal output by the message reader-writer;
5) The 9Mhz data conditioning circuit sorts and restores the signals transmitted by the message reader-writer, and transmits the data to the message and writes the data into the singlechip;
6) The message writing singlechip determines whether to write new message data from the message reader-writer into the message memory or not through the judgment of the safety control circuit.
The invention has the advantages that the probability of writing the transponder message is not high from the practical use condition of users, and the miniaturized transponder is arranged at a position close to a vehicle section, so that the miniaturized transponder is different from the conventional transponder which adopts BP to wirelessly burn message data, the function of writing the message by using a message reader-writer is removed, the function of writing the message by directly connecting a wired (USB interface) with a notebook computer (PC) is changed, a large number of components can be reduced in a transponder circuit, and the cost is greatly reduced.
A schematic diagram of the functional modules inside the miniaturized transponder is shown in fig. 6. The workflow of each module is as follows:
1) The 27Mhz receiving circuit comprises a 27Mhz coil for receiving energy emitted by the BTM antenna and converting the energy into a direct current power supply and a clock frequency required by the working of the transponder;
2) The main control circuit reads the message data in the message memory, modulates the message data into an FSK signal and outputs the FSK signal to the FSK transmitting circuit;
3) The FSK transmitting circuit transmits FSK signals to the vehicle-mounted BTM antenna;
4) When changing the message, the USB line is directly connected with the notebook computer, and the message is written by special software.
In summary, compared with the existing transponder, the miniaturized transponder provided by the invention omits a 9Mhz receiving circuit, a 9Mhz data conditioning circuit, a safety control circuit, a message writing singlechip and other circuit modules, reduces the circuit scale by 40%, and greatly reduces the corresponding cost.
In field application, existing transponders are limited by industry standards, the minimum interval between every two transponders is 5 meters, as shown in fig. 7, dense installation cannot be realized, at most 21 transponders are allowed to be installed within a range of 100 meters, and a train can receive data volume equivalent to 21 message contents within the range of 100 meters.
The miniaturized transponder of the invention is not limited by industry standard because of small volume, and the minimum distance between every two of the miniaturized transponders is 1 meter, as shown in fig. 8, thus meeting the requirement of dense installation, and at most 101 miniaturized transponders are allowed to be installed within the range of 100 meters, and the maximum data volume which can be received by a train when passing is approximately 5 times of that of the existing transponders.
The miniaturized transponder of the invention also has an active transponder mode, can be used independently as the existing active transponder, is connected to a ground electronic unit LEU through a standard C interface, transmits message data of the LEU to a vehicle-mounted BTM, can be densely installed to form a miniaturized transponder array, and is connected to LEU equipment through a C interface cable. The LEU can send information to different miniaturized transponders in the array through the C interface according to the requirement, and the vehicle-mounted BTM can receive the information when a train passes through, so that a novel ground-to-vehicle-to-ground communication system is realized, and the information data can be messages or data (such as line map data, temporary speed limiting and other vehicle control data) required to be updated by the vehicle-mounted BTM or LKJ/ATP (as shown in fig. 9).
The foregoing description is only of the preferred embodiments of the present invention and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. A miniaturized transponder is characterized in that a resonance coil is added between a BTM coil and a main coil of the transponder, and an inductance-capacitance element is matched for tuning, which is called a focusing ring;
the transponder is of a double-layer coil structure, the focusing ring is arranged in the transponder shell, forms a focusing effect with the main coil of the transponder, and is tuned to 27.095Mhz for resonance through matching with the inductance capacitance element;
under the action of the focusing ring, the transponder can obtain electromagnetic wave energy required by work in a larger range;
compared with the conventional transponder, the size of the miniaturized transponder is greatly reduced, and the minimum mounting distance between every two transponders is 1 meter, so that the requirement of dense mounting is met;
the miniaturized transponder can be densely installed in a plurality of ways to form a miniaturized transponder array;
the action range of the miniaturized transponder relative to the BTM antenna reaches 600mm, the level of the existing transponder is achieved, and the application of the train at the highest speed of 400km/h is met.
2. The transponder of claim 1, wherein the miniaturized transponder eliminates the function of writing messages using a message reader-writer, and instead uses a wired direct-connect computer to write messages.
3. The transponder of claim 2, wherein the miniaturized transponder eliminates the 9Mhz receiving circuit, 9Mhz data conditioning circuit, security control circuit and circuit module of the message writing single chip microcomputer, the circuit scale is reduced by 40%, and the cost is greatly reduced compared with the existing transponder.
4. Transponder according to claim 1, characterized in that the miniaturized transponder has an active transponder mode, which can be used as such as an existing active transponder alone, connected to a ground electronics unit LEU via a standard C interface, transmitting the message data of the LEU to the onboard BTM.
5. The transponder according to claim 4, wherein the LEU transmits information to different miniaturized transponders in the array via the C-interface on demand, which information can be received by the onboard BTM as the train passes thereby enabling a ground-to-vehicle-to-ground communication system.
6. Transponder according to claim 1, characterized in that the miniaturized transponder length-width dimensions are 100mmx200mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111448937.1A CN114124147B (en) | 2021-11-30 | 2021-11-30 | Miniaturized transponder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111448937.1A CN114124147B (en) | 2021-11-30 | 2021-11-30 | Miniaturized transponder |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114124147A CN114124147A (en) | 2022-03-01 |
| CN114124147B true CN114124147B (en) | 2024-01-12 |
Family
ID=80369200
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111448937.1A Active CN114124147B (en) | 2021-11-30 | 2021-11-30 | Miniaturized transponder |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114124147B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114401021B (en) * | 2022-03-25 | 2022-07-05 | 北京全路通信信号研究设计院集团有限公司 | Integrated BTM antenna device and communication method thereof |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5608417A (en) * | 1994-09-30 | 1997-03-04 | Palomar Technologies Corporation | RF transponder system with parallel resonant interrogation series resonant response |
| JPH10215210A (en) * | 1996-11-29 | 1998-08-11 | Nippon Steel Corp | Data carrier system |
| JP2009083782A (en) * | 2007-10-02 | 2009-04-23 | Kyosan Electric Mfg Co Ltd | Frequency multiple resonance device, on-vehicle information transmission device, and on-ground information transmission device |
| CN103560598A (en) * | 2013-11-12 | 2014-02-05 | 天津工业大学 | Enhanced type electromagnetic resonance subway wireless power supply system |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104052519A (en) * | 2014-06-13 | 2014-09-17 | 固安信通信号技术股份有限公司 | Duplex antenna applied to BTM system, transponder information reading method and BTM self-checking method |
| US20160351328A1 (en) * | 2015-05-27 | 2016-12-01 | Xerox Corporation | Coupling enhancement intermediary coil for tag communication standardization |
| CN108092690A (en) * | 2016-11-22 | 2018-05-29 | 河南蓝信科技股份有限公司 | A kind of transponder and its method |
| CN111216764B (en) * | 2020-02-20 | 2022-02-11 | 北京交大思诺科技股份有限公司 | Modularized multifunctional transponder |
| CN112429043A (en) * | 2020-11-26 | 2021-03-02 | 北交智慧科技有限公司 | Transponder system and transponder for a rail vehicle |
| CN113602323A (en) * | 2021-09-06 | 2021-11-05 | 陈建明 | Method and system for realizing train occupation and integrity check and train control by using transponder |
-
2021
- 2021-11-30 CN CN202111448937.1A patent/CN114124147B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5608417A (en) * | 1994-09-30 | 1997-03-04 | Palomar Technologies Corporation | RF transponder system with parallel resonant interrogation series resonant response |
| JPH10215210A (en) * | 1996-11-29 | 1998-08-11 | Nippon Steel Corp | Data carrier system |
| JP2009083782A (en) * | 2007-10-02 | 2009-04-23 | Kyosan Electric Mfg Co Ltd | Frequency multiple resonance device, on-vehicle information transmission device, and on-ground information transmission device |
| CN103560598A (en) * | 2013-11-12 | 2014-02-05 | 天津工业大学 | Enhanced type electromagnetic resonance subway wireless power supply system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114124147A (en) | 2022-03-01 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US5164732A (en) | Highway vehicle identification system with high gain antenna | |
| US5196846A (en) | Moving vehicle identification system | |
| US5245346A (en) | Interrogator/transponder system and mobile transponder device | |
| US5132687A (en) | Electronic identification system | |
| CN114124147B (en) | Miniaturized transponder | |
| US20110012723A1 (en) | Embedded in tire self-powered semi-passive rfid transponder | |
| CN102968824B (en) | Vehicle management system based on optical communication | |
| CN201576743U (en) | Antenna used in transmission module of CTCS responser | |
| JPH04354722A (en) | Electronic tag | |
| JP4909798B2 (en) | Skeleton equalizing antenna, RFID tag and RFID system using the antenna | |
| CN101140612A (en) | Sound wave recognition ( SWID ) technology | |
| CN112622980A (en) | Response positioning system suitable for shunting locomotive | |
| CN103679233A (en) | Locomotive locating system and method based on radio frequency identification technology | |
| US20030142003A1 (en) | Method and systems for testing an antenna | |
| CN114157327B (en) | Antenna design method for improving action range | |
| EP0178924B1 (en) | Electronic identification system | |
| CN2921959Y (en) | Long-distance card reader and IC card with angle positioning | |
| CN201646776U (en) | Rail transit intelligent safety early warning system | |
| CN111216764B (en) | Modularized multifunctional transponder | |
| CN109760723B (en) | Novel railway crossing early warning equipment | |
| CN109886051B (en) | Vehicle positioning radio frequency identification system and quick inspection positioning method thereof | |
| CN109614836B (en) | Vehicle positioning radio frequency identification system and positioning method thereof | |
| JP2009100288A (en) | Vehicular communication module | |
| CN101549703B (en) | A long range active response loop wire set | |
| JP7086777B2 (en) | In-vehicle antenna unit and in-vehicle system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |