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
  • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
  • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
  • H04B7/0682—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission using phase diversity (e.g. phase sweeping)
• • G—PHYSICS
  • G08—SIGNALLING
  • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
  • G08B13/00—Burglar, theft or intruder alarms
  • G08B13/22—Electrical actuation
  • G08B13/24—Electrical actuation by interference with electromagnetic field distribution
  • G08B13/2402—Electronic Article Surveillance [EAS], i.e. systems using tags for detecting removal of a tagged item from a secure area, e.g. tags for detecting shoplifting
  • G08B13/2465—Aspects related to the EAS system, e.g. system components other than tags
  • G08B13/2468—Antenna in system and the related signal processing
  • G08B13/2474—Antenna or antenna activator geometry, arrangement or layout
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01Q—ANTENNAS, i.e. RADIO AERIALS
  • H01Q1/00—Details of, or arrangements associated with, antennas
  • H01Q1/12—Supports; Mounting means
  • H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
  • H01Q1/2208—Supports; Mounting means by structural association with other equipment or articles associated with components used in interrogation type services, i.e. in systems for information exchange between an interrogator/reader and a tag/transponder, e.g. in Radio Frequency Identification [RFID] systems
  • H01Q1/2216—Supports; Mounting means by structural association with other equipment or articles associated with components used in interrogation type services, i.e. in systems for information exchange between an interrogator/reader and a tag/transponder, e.g. in Radio Frequency Identification [RFID] systems used in interrogator/reader equipment
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01Q—ANTENNAS, i.e. RADIO AERIALS
  • H01Q21/00—Antenna arrays or systems
  • H01Q21/06—Arrays of individually energised antenna units similarly polarised and spaced apart
  • H01Q21/061—Two dimensional planar arrays
  • H01Q21/065—Patch antenna array
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01Q—ANTENNAS, i.e. RADIO AERIALS
  • H01Q3/00—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system
  • H01Q3/26—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system varying the relative phase or relative amplitude of energisation between two or more active radiating elements; varying the distribution of energy across a radiating aperture
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01Q—ANTENNAS, i.e. RADIO AERIALS
  • H01Q3/00—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system
  • H01Q3/26—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system varying the relative phase or relative amplitude of energisation between two or more active radiating elements; varying the distribution of energy across a radiating aperture
  • H01Q3/30—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system varying the relative phase or relative amplitude of energisation between two or more active radiating elements; varying the distribution of energy across a radiating aperture varying the relative phase between the radiating elements of an array
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01Q—ANTENNAS, i.e. RADIO AERIALS
  • H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
  • H01Q9/04—Resonant antennas
  • H01Q9/0407—Substantially flat resonant element parallel to ground plane, e.g. patch antenna
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01Q—ANTENNAS, i.e. RADIO AERIALS
  • H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
  • H01Q9/04—Resonant antennas
  • H01Q9/0407—Substantially flat resonant element parallel to ground plane, e.g. patch antenna
  • H01Q9/0428—Substantially flat resonant element parallel to ground plane, e.g. patch antenna radiating a circular polarised wave
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04B—TRANSMISSION
  • H04B5/00—Near-field transmission systems, e.g. inductive or capacitive transmission systems
  • H04B5/40—Near-field transmission systems, e.g. inductive or capacitive transmission systems characterised by components specially adapted for near-field transmission
  • H04B5/48—Transceivers
• • 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
  • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
  • H04B7/0686—Hybrid systems, i.e. switching and simultaneous transmission
  • H04B7/0691—Hybrid systems, i.e. switching and simultaneous transmission using subgroups of transmit antennas

Definitions

• the invention relates to an RFID antenna system with an RFID antenna device for a goods identification system (WIS) according to the preamble of claim 1.
• WIS goods identification system
• UHF RFID methods and systems for article acquisition and identification have already become known.
• a product to be detected is provided with an RFID tag.
• This method offers over a likewise known method for electronic article security (a so-called EAS system) first of all the significant advantage that not only a single bit can be evaluated as information by means of an RFID tag, but that this UFH RFID Labels are provided with a microchip on which information with a word length of several digits can be stored and read out by them.
• passive RFID tags are used, which use their energy to read the tag content and send back the corresponding information from the electromagnetic field of the antenna system. received.
• the RFID tag consists of an antenna structure with the aforementioned microchip.
• Reader is used, for example, the tags the necessary energy for operation through the electromagnetic field is supplied via an antenna system, the provided with the microchip tags then the stored information using this Energy can send a corresponding response that can be read and evaluated via an antenna system and a downstream RFID reader.
• EAS electronic article security systems
• RFID antenna systems which are arranged at a distance from one another in the region of the exit or a passage and between which the passageway to be monitored is formed.
• the corresponding products available in the shop and Goods are secured, for example, by means of an electronic goods security label. If the goods are properly paid, the sales person will remove the corresponding counterfeit label, so that the customer can easily go through the monitored exit passage with the goods.
• the aforementioned EAS systems operate in the manner of a 1-bit transponder in which the presence or absence of a particular tag in the monitoring and reading area can be detected.
• an antenna system is basically known, which can be installed in a passageway (doorway).
• different antenna systems can be used, namely, for example, a patch antennas existing RFID antenna system.
• so-called loop antennas or a so-called photonic band GAP antenna can be used.
• the antennas described may, in addition to a passageway on an adjacent wall pointing in the front direction or in an actual door frame facing in the front direction or pointing backwards or else parallel to Passage direction extending in the actual archway be arranged radiating.
• patch antennas are used, several patch antennas can also be operated together, which are arranged one above the other in the vertical direction.
• a plurality of such patch antennas can be used, which are arranged to run in a plurality of branches in the vertical direction and operated together, wherein in a variant described so-called diversity switches or diversity combiners can be used for this purpose.
• this system can be used for an electronic article security system EAS and / or for a goods identification system WIS.
• this prepublication also does not reveal that an RFID antenna system can be constructed which comprises antennas for an electronic article security system EAS and, in addition, antennas for a goods identification system WIS.
• the object of the present invention is therefore to provide an improved RFID antenna system for a goods identification system (WIS) for reading out tags provided with a microchip. It should be a fundamentally simple system. If necessary, the system should also be easily adaptable to different circumstances and peculiarities in order to obtain optimum results with regard to the retrieval of information from corresponding tags. In a preferred embodiment of the invention, it should also be ensured that the antenna system according to the invention also can be retrofitted in a conventional electronic article security system (EAS).
• EAS electronic article security system
• the inventive electronic goods identification system is characterized on the one hand by the simple structure and its high flexibility and adaptability to different circumstances and specifics on site. At the same time, the monitoring and reading range can be adjusted so differently that malfunctions can be safely avoided.
• the inventively improved system works, as in the prior art, based on the RFID technology.
• the invention provides that the antenna system provided laterally by a passage area to be monitored comprises at least two antennas, these at least two antennas in the passage direction or at least with one component in the passage direction are arranged side by side. You do not necessarily have to be in the same altitude (ie, for example, parallel to the level of the passageway), but can also be partially positioned at different altitudes. However, a line lying through the middle or center of gravity of the two adjacent antenna systems should be opposite a horizontal plane (or a plane parallel to the passageway plane) have an angular deviation, which is preferably not greater than 45 °.
• the UHF RFID system includes patch antennas or patch antennas. These have a particularly low overall height and can therefore be easily retrofitted into existing, often consisting of frame-shaped antennas EAS antenna system devices, for example, within the frame-shaped antenna of the existing EAS monitoring system.
• the arrangement of two patch antennas which are offset from each other with lateral offset in the passage direction or with a component in the passage direction, can be realized with simple means improved bundling of the surveillance area.
• This offers significant advantages insofar as correspondingly tagged goods or products are only detected and read out when a person with a product comprising a microchip comprising an RFID tag actually passes through the defined reading area (ie the surveillance area) and not only in passes near this reading area.
• This ensures, above all, that no too early detection is triggered by the fact that, for example, a person walks past the passage protected by two antenna systems at the side only in the immediate vicinity (for example still in the store) and thereby a product secured with a tag already reach the detection and / or reading range of the antenna system.
• the patch antennas according to the invention can be used as individual Patch antennas be formed. However, they can also be designed as combined patch antennas, which are formed, for example, on a common ground plane, on a common substrate, etc., so that only the patch areas are arranged separately on this substrate. Here are any modifications possible.
• At least two pairs of patch antennas are arranged one above the other at each side antenna device, ie at two different levels or planes (where the paired patch antennas, as mentioned above, are not necessarily the same Height level, but at least in the specified extent offset from each other can be arranged).
• the patch antennas may be mechanically pre-adjusted so that their main radiation direction is not aligned substantially parallel to the plane of the passageway (the bottom surface), but deviating from it with a vertically extending component.
• the patch antennas can operate linearly or circularly polarized.
• the circularly polarized operation of the patch antennas has advantages in so far as it is ensured that a product tagged with RFID tags is always reliably recognized and the information stored on the tag can be easily and completely read, regardless of the orientation of the tag when passing through the reading area.
• This RFID system preferably operates in the UHF range, for example in the 800 MHz to 1000 MHz range (in particular in the 800 MHz to 950 MHz range - for example 868 MHz range).
• the reading range of the patch antennas can be up to 1.5 m and more (for example, up to 2 m, etc.).
• Antenna device also in an existing RFID antenna system for an electronic article surveillance system
• FIG 1 is a schematic representation of a monitoring area or passage for an electronic goods identification system (WIS);
• WIS electronic goods identification system
• FIG. 2 shows a schematic view of the UHF antenna arrangement according to the invention for an electronic article security system (EAS) in the direction of the transit view;
• EAS electronic article security system
• FIG. 3 is a schematic plan view of a patch antenna pair used
• FIG. 5 is a cross-sectional illustration of an embodiment modified from FIG. 3;
• FIG. 6 shows an embodiment of a patch antenna pair deviating from FIGS. 3 and 4;
• FIG. 7 shows a further modified exemplary embodiment in plan view of the patch antennas used
• FIG. 8 shows a further detailed representation of a possible embodiment variant
• FIG. 9 shows a simplified embodiment variant corresponding to FIG. 8.
• FIG. 1 shows the schematic basic structure of an electronic article identification system (WIS) is shown, with two mutually offset antennas nen owneden 1, between which a passageway 3 along the passage direction is 3 ⁇ on a bottom surface 5 therethrough.
• WIS electronic article identification system
• the antenna devices 1 are formed in the manner of lateral boundaries I 1 , which essentially comprise a vertical or vertical extension 7 extending transversely or in particular perpendicular to the bottom surface 5, a transverse or parallel or substantially parallel or with a component parallel to the passage 3 Horizontal straightening 9 and a comparatively narrow designed thickness extension 11 transversely or perpendicular to the passage direction 3 and thus in particular parallel to the bottom surface 5 have.
• FIG. antenna 15 shown. These are not part of the present invention of a Goods Identification System (WIS). This merely serves to illustrate that the inventive RFID antenna arrangement for a goods identification system (WIS) can also be accommodated in a side boundary 1 'in which, for example, an antenna device for a conventional electronic article security system ( EAS), for example using rectangular frame antennas 15th
• EAS electronic article security system
• a transmitting and / or evaluating unit 17 is preferably provided in the foot region 1 "of this side boundary 1.
• UHF RFID arrangement For the product identification system (WIS) described in more detail below, a UHF RFID arrangement is used, for which additional antennas in the form of patch antennas are provided.
• This system serves - as stated - above all by using tags with microchips to capture and read out product-related information, ie information about those goods on which the tag in question is appropriate. Ultimately, however, in a further step, this information can also be used to ultimately build an electronic article surveillance device (if, for example, the product-related information stored on the tag is read out and, for example, compared with information stored via a cash register system in order to query it whether or not a product bearing the date has already been paid for).
• product-related information ie information about those goods on which the tag in question is appropriate.
• this information can also be used to ultimately build an electronic article surveillance device (if, for example, the product-related information stored on the tag is read out and, for example, compared with information stored via a cash register system in order to query it whether or not a product bearing the date has already been paid for).
• each a pair of patch antennas 21 in an upper region and two further pairs of patch antennas 21 in a lower region of the side boundary 1 'and the lateral antenna device 1 are arranged, in the embodiment shown when viewed transversely to the side boundaries within the frame-shaped loop antennas 15th
• the patch antennas are antennas, which in accordance with the illustration of Figure 3 in vertical
• an upper patch surface 25 and a lower ground surface 27 is provided above or below the substrate 23, wherein above or below the substrate 23, an upper patch surface 25 and a lower ground surface 27 is provided.
• the patch surface 25 and the ground surface 27 are at a distance 23 'corresponding to Thickness of the substrate 23 arranged to each other.
• the two patch antennas 21 are arranged parallel in front of a ground plane 31, in such a way that the lower ground plane 27 of the respective patch antenna 21 is galvanically isolated from the ground plane 31 (ie in a capacitive arrangement to) comes to rest.
• the ground plane 31 projects beyond the patchan antennas in plan view and projects laterally over the patch antennas in all directions.
• the ground surface 31 may consist, for example, of metal or a metal sheet or, for example, of a copper-coated printed circuit board.
• ground plane 27 of the patch antenna 21 is galvanically isolated from the common ground plane 31 is particularly useful when using conventional patch antennas which are adhered to the ground plane 31 using an adhesive (if it is not electrically conductive), for example.
• a mentioned patch antenna with its lower ground surface 27 could also be placed directly on the ground surface 31 to produce a direct current or galvanic contact.
• the ground surface 27 located on the substrate is dispensed with, namely, namely, when the patch antenna is constructed directly with its substrate on the ground surface 31.
• a passage opening 31 ' in the respective ground plane 27 belonging to the patch antenna 21, a passage opening congruent therewith 27 'and through the substrate 23 passing through a passageway 35 is formed, so that extends through this entire arrangement, a feed line 37 which is electrically galvanically connected to the overhead patch surface 25 at a feed point 25'.
• the patch surface 25 can also have, for example, a U-shaped recess or the like, so that the feed line running in the plane of the patch surface 25 is further inwardly offset, for example, at the end of the U-shaped recess (ie opposite the peripheral edge of the patch surface). is electrically connected to the Patchflä-.
• the underlying ground surface 27 extends to the peripheral side surface 123 of the substrate 23, whereas the apparent in the plan view of Figure 3 patch surface 25 at a distance 39 before the side boundary or side surface 123 of the substrate 23 ends, so in plan view with smaller Longitudinal and transverse extension is formed as the lower ground surface 27 of the patch antenna 21st
• the at least approximately square-shaped surface of the patch antenna 21 is at two diagonally opposite corners with a Bevel 41 provided, which serves the tuning of the antenna.
• Two patch antennas formed in accordance with the exemplary embodiment according to FIGS. 3 and 4 are arranged at a lateral spacing 43 (that is to say at a clear lateral spacing 43 between two side boundary surfaces 123 of the two adjacent patch antennas facing each other), namely on a common ground plane 31.
• the distance between the two center points of the patch antennas or the centers of gravity of the two patch antennas is designated 45.
• This center distance 45 should be greater than or equal to 0.2 times ⁇ (lambda) based on the operating frequency of the patch antennas used, preferably the center wavelength of the frequency used, for example 0.2 ⁇ 34 cm ⁇ 5 cm are.
• the patch antennas do not necessarily have to be the same or the same size. They also do not necessarily have to be arranged next to one another exactly in the horizontal offset, that is to say in the direction parallel to the passage direction 3 '(it being assumed in the exemplary embodiment shown that the passage direction 3 1 extending in the horizontal direction runs parallel to the bottom surface 5).
• a cooperating patch antenna pair does not basically have to be formed from two overall individual patch antennas 21, but may have a common construction.
• the patch antenna pair according to FIG. 5 has a common ground surface 27 on the underside of a common substrate 23, the two separate patch surfaces 25, which are fed via a separate feed line 37, being formed on the upper side of the substrate 23 which ends at a feeding point 25 'on the associated patch surfaces 25.
• the patch antenna pair thus formed is arranged at a small distance above the common ground surface 31, so that the ground surface 27 extends on the underside of the substrate in close proximity to the common ground surface 31.
• the patch antenna pairs partially shown in the figures are arranged offset in the forward direction 3 'to each other. They do not have to be arranged exactly parallel to the passage direction 3 '. In particular, even if, for example, the passage widens conically or tapers, the lateral distance from a vertical plane lying in the passage direction 3 'to the relevant patch face 25 of a patch antenna 21 could be reduced. be different.
• the mentioned patch antenna pair represents a basic embodiment of the invention in which at least two patch antennas 21 form a first group A of cooperating patch antennas. It can be arranged offset in the passage direction or with a component in the passage direction to each other but still several patch antennas, for example, three patch antennas, etc.
• such a cooperating pair of patch antennas 21 can be arranged not only in the forward direction 3 'but also in the vertical or vertical direction 7 with a certain offset from one another.
• a maximum deviation in height and / or vertical direction is preferably to be carried out such that a straight line 47 laid through the center or center of gravity of the associated pair of patch antennas leads to a horizontal plane or to a plane parallel to the passageway or bottom surface 5 48 includes an angle ⁇ that is less than or equal to 45 °.
• the patch antennas shown in FIGS. 1 to 6 could also be arranged twisted relative to one another, so that in the case of a patch antenna, the feed point 25 'is more at the top and at the adjacent patch antenna at the bottom or at one antenna rather at the right and at the other Patch antenna, for example, rather on the left side, etc. is located. Again, there are basically no restrictions.
• a second patch antenna group B is higher (in the embodiment shown in FIG Form of a higher-lying patch antenna pair B) is provided, wherein the higher-lying patch antenna pair B although with a same vertical or vertical offset (which need not necessarily be so) is arranged, but in the forward direction 3 'differently positioned opposite the lower patch antenna pair A.
• each of the mentioned groups A or B or each further patch antenna group can also have more than two patch antennas, which are arranged offset in the passage direction or at least in one component in the passage direction.
• the clearances 43 in the horizontal or passage direction 3 1 or in the vertical or vertical direction 7 can be of the order of magnitude of a few mm to a few cm (without any fundamental restriction to this size range).
• the lower row A of patch antennas 21 relative to the upper row B of patch antennas 21 can be fed to one another with a phase shift, resulting in an electrical uptilt or, depending on the arrangement, if desired, create a so-called electrical down-tilt.
• the main emission direction or main lobe is thereby electrically pre-set in ascending vertical orientation or rather in lowered vertical orientation. In this way, therefore, a specific fine adjustment of the monitoring area can be made.
• the control of the patch antennas can take place so that the monitoring area is electrically preset from the lower floor upwards.
• a different phase control with respect to the patch antennas arranged one above the other in the various rows or planes can be carried out in such a way that For example, the main lobe or the main monitoring area is not perpendicular to the ground plane 31 of the patch antennas, but is aligned with a component in the vertical direction running upward.
• a corresponding patch antenna group according to FIG. 7 is, for example, in the upper region X2 (FIG. 1) of FIG Antenna device 1 used here, a different phase feed could be made, for example, so that the main beam direction of the patch antennas is oriented in a certain angle range rather downwardly extending into the surveillance area inside.
• the different phase control between the two patch antennas 21 of a group A and / or B arranged adjacent to one another approximately at the same height can be such that the alignment of the monitored area corresponds to the main beam direction (direction of the main lobe) of the patch antenna in one or in opposite directions set direction with respect to the passageway 3 is deflected out of a transverse to the middle symmetry plane out.
• additional patch antennas 21 may be provided, for example, additionally in the floor area or in the ceiling area or for example at the foot area 1 "of the antenna device 1 (or also at the upper end area of the antenna device 1)
• at least one pair of patch antennas or, for example, three, four or more patch antennas, in particular in the direction of passage or with a component in the passage direction are used, at least one pair of patch antennas or, for example, three, four or more patch antennas
• patch antennas provided on the upper end region can also be aligned in a preset manner upwards or downwards, in particular if electronic beamforming and alignment, as explained above with reference to FIG. 7, are not undertaken.
• patch antennas mentioned in the lower or upper region of the side parts 1 'or in the bottom region or above the passageway are used as additional patch antennas
• individual patch antennas can also be used here.
• two or more patch antennas lying side by side in the passage direction or at least offset with one component in the passage direction are also used here, which thus form groups of patch antennas which interact.
• the height of a patch antenna or patch antenna pair i. in particular the associated ground surface 31, for example, may preferably be between 5 cm to 40 cm.
• the distance 55 of the lower patch antenna combination 125a to the bottom surface should be at least 0.3 to 1 m.
• the distance 57 between the lower patch antenna combination 125a and the upper patch antenna combination 125b should preferably be between 0.1 m to 2 m, in particular around 0.2 m to 1.2 m. The distance can also be arbitrarily greater if particularly high side boundaries 1 'are used and the upper antenna devices are to be particularly located.
• the distance of this patch antenna combination 125 to the bottom 5 should have a dimension of at least 0.5 m and more, the overall height of the arrangement again can be 1 to 2 m.
• the patch antennas 21 used to enable an electronic goods identification system operate preferably in the UHF frequency range, ie for example in an 800 MHz to 950 MHz or 1000 MHz range (in particular in the range of 868 MHz). If this WIS system is used in addition to a conventional EAS monitoring system which operates without the patch antennas mentioned, it is preferred to use a conventional monitoring system, for example in the 10 Hz to 20 kHz (in particular in electromagnetic EAS methods) or for example in the 5 MHz to 10 MHz range (for example around 8, 2 MHz), in particular if it is a radio-frequency EAS method.
• WIS electronic goods identification system
• the patch antennas used in accordance with the invention are used for an RFID surveillance system used, so that products to be monitored, goods and / or persons, etc., can be detected if they still carry an RFID tag with him, recognized during the passage along the fürweges and the corresponding information by means of a provided for this purpose "readers" can be read and evaluated.
• the monitoring system with a passage gate along a passageway described in particular with reference to FIGS. 1 and 2 can also be constructed such that corresponding side boundaries are arranged several times side by side in the lateral spacing, for example five side boundaries I 1 , whereby four parallel passageways 3 are defined.
• the central antenna devices 1 that is to say, not in the extreme antenna devices 1
• patch antennas are then installed in such a way that they radiate partly in one direction and partly in the opposite direction for detecting both transmission paths.
• the mentioned antenna devices 1 for monitoring a passageway are used and used in such a way that a pair of such antenna devices 1 is provided, ie in each case a corresponding antenna device 1 or a side boundary I 1 , which are arranged opposite to the passage to be monitored ,

Landscapes

• Engineering & Computer Science (AREA)
• Signal Processing (AREA)
• Computer Networks & Wireless Communication (AREA)
• Physics & Mathematics (AREA)
• Automation & Control Theory (AREA)
• Computer Security & Cryptography (AREA)
• Electromagnetism (AREA)
• General Physics & Mathematics (AREA)
• Waveguide Aerials (AREA)
• Variable-Direction Aerials And Aerial Arrays (AREA)
• Burglar Alarm Systems (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=39767795

Family Applications (1)

Country Status (8)

Cited By (1)

Families Citing this family (6)

Family Cites Families (8)

• 2007
  • 2007-04-17 DE DE102007018058A patent/DE102007018058A1/de not_active Ceased
• 2008
  • 2008-04-16 JP JP2010503401A patent/JP2010527521A/ja not_active Abandoned
  • 2008-04-16 CN CN200880012315A patent/CN101657937A/zh active Pending
  • 2008-04-16 CA CA002683799A patent/CA2683799A1/en not_active Abandoned
  • 2008-04-16 BR BRPI0810657-6A2A patent/BRPI0810657A2/pt not_active IP Right Cessation
  • 2008-04-16 RU RU2009142219/07A patent/RU2009142219A/ru not_active Application Discontinuation
  • 2008-04-16 WO PCT/EP2008/003040 patent/WO2008125346A2/de active Application Filing
  • 2008-04-16 EP EP08735282A patent/EP2137792A2/de not_active Withdrawn

Non-Patent Citations (1)

Also Published As

Similar Documents

Legal Events