EP2618425A1 - Antenna cover - Google Patents
Antenna cover Download PDFInfo
- Publication number
- EP2618425A1 EP2618425A1 EP12189032.1A EP12189032A EP2618425A1 EP 2618425 A1 EP2618425 A1 EP 2618425A1 EP 12189032 A EP12189032 A EP 12189032A EP 2618425 A1 EP2618425 A1 EP 2618425A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- antenna
- opening
- slot
- metallic
- metallic part
- 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
Links
- 238000012545 processing Methods 0.000 claims abstract description 35
- 239000000463 material Substances 0.000 claims abstract description 5
- 150000001875 compounds Chemical class 0.000 claims description 7
- 238000004382 potting Methods 0.000 claims description 7
- 239000003989 dielectric material Substances 0.000 claims description 2
- 238000004891 communication Methods 0.000 description 7
- 239000002184 metal Substances 0.000 description 6
- 101700004678 SLIT3 Proteins 0.000 description 3
- 102100027339 Slit homolog 3 protein Human genes 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000004020 conductor Substances 0.000 description 2
- 230000001419 dependent effect Effects 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 229920003023 plastic Polymers 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N Alumina Chemical compound [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 238000004026 adhesive bonding Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 230000006735 deficit Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 230000003116 impacting effect Effects 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 239000002923 metal particle Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000012811 non-conductive material Substances 0.000 description 1
- 230000010287 polarization Effects 0.000 description 1
- 229920002635 polyurethane Polymers 0.000 description 1
- 239000004814 polyurethane Substances 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/42—Housings not intimately mechanically associated with radiating elements, e.g. radome
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q13/00—Waveguide horns or mouths; Slot antennas; Leaky-waveguide antennas; Equivalent structures causing radiation along the transmission path of a guided wave
- H01Q13/10—Resonant slot antennas
Definitions
- the invention relates to an antenna cover for covering at least one antenna with respect to the processing space of a processing machine.
- wireless data connections to metal-cutting machines are characterized by the presence of sharp-edged metal particles and chips as well as aggressive liquids in the processing area.
- a device for wireless transmission between two parts of a processing machine is known, one of which rotates in operation relative to the other.
- dipole antennas are arranged, which extend in the circumferential direction and are embedded for their protection in plastic parts.
- the US 5,767,789 teaches the mounting of frequency-selective windows in the walls of closed metal containers such as transport containers, computer housings, washing machines or vehicle bodies to enable communication with transponders located in the respective interior of such containers.
- the EP 1 112 810 A1 shows an arrangement of two looped circumferentially extending antennas on an operating rotating part of a work spindle of a processing machine. Above the antennas a cover is attached, which is suitable for Electromagnetic waves must be permeable and therefore apparently consists of a dielectric.
- the DE 10 2007 061 707 A1 teaches the integration of a communication unit with a slot antenna into a forklift of a forklift for the purpose of identifying cargo by communicating with transponders located on such cargo.
- the EP 2 095 291 B1 shows the use of frequency-selective surfaces as aids for the operation of RFID products.
- An application example consists in a conveyor belt, below which an RFID reader covered by a metal plate with a frequency-selective surface is arranged.
- the DE 10 2006 026 014 A1 teaches the formation of an antenna for a transponder by means of a recess and a breakthrough in a metallic component associated with the transponder, whereby the impairment of the function of a transponder is to be minimized by the arrangement of a metallic component.
- the object of the invention is to protect a provided for communication within a processing machine antenna particularly effective against harmful environmental influences.
- An antenna cover according to the invention for covering at least one antenna with respect to the processing space of a processing machine has a metallic and a non-conductive part.
- the non-conductive part fills an opening formed in the metallic part, the circumference of which corresponds to the wavelength of electromagnetic waves in the non-conductive material at the center frequency of the frequency range for which the antenna is designed.
- the cover has the shape of a plate and forms part of a housing wall bounding the processing space of the processing machine or is installed in such a housing wall.
- the opening in the metallic part may have the shape of a rectilinear slit or a slot or a circular bore.
- the smallest cross-sectional dimension of the opening should at least approximately correspond to the thickness of the metallic part in the vicinity of the opening in order to ensure the intended effect of the cover as a bandpass filter for electromagnetic waves.
- the metallic part has on the side of the cover which is intended to face the processing space, a recess which surrounds the opening on said side, and the non-conductive part also fills the recess.
- the non-conductive part is mechanically firmly anchored in the metallic part and can, during operation, generate a mechanical load from the direction of the machining space, e.g. by impacting metal chips, due to a positive support to the metallic part resist.
- the non-conductive part consists of a potting compound which is cast into the cavity formed in the metallic part through the opening and optionally through a cavity surrounding the opening.
- a separate production of the non-conductive part with exactly to the cavity in the metallic part matching dimensions is unnecessary thereby.
- a non-conductive part but also a prefabricated molded part of a dielectric material may be used, which is inserted into the cavity and fixed therein, for example, glued.
- alumina ceramic comes into question, which has the advantage of a relatively large electrical Permittivity has. This results in a given frequency, a reduction in the wavelength, which allows a reduction in the dimensions of the opening, since they are dependent on the wavelength.
- a plurality of openings may be provided in the metallic part, each opening being associated with one of a plurality of existing antennas and disposed adjacent to its respective associated antenna. This is advantageous if there is a need for multi-channel communication and for this purpose several communication modules, each with their own antennas to be used. The positions of the individual openings can then be matched to those of the individual antennas in order to minimize the respective attenuation of the electromagnetic waves.
- the cover may itself constitute part of the antenna by making the antenna a slot antenna whose slot is formed by the slot of the cover. This results in a particularly flat design of the antenna, since in this case only an RF cable needs to be brought to the back of the metallic part and connected at a suitable location with this.
- an antenna cover 1 has a metallic part 2 with a slot-shaped opening 3 and a groove-shaped depression 4.
- the part 2 has the shape of a circular plate in the illustrated example. Instead of being circular, the plate could also be oval or rectangular, and it also does not have to be flat, but could instead have a domed shape.
- the slot 3 and the recess 4 are filled by a non-conductive part 5, ie a dielectric, which in the sectional view of Fig. 2 that are on the line AA in Fig. 1 refers, hatched.
- the non-conductive part 5 consists of a potting compound based on polyurethane, which is poured into the cavity consisting of the slot 3 and the recess 4 in the metallic part 2 and cured there. In combination, both parts 2 and 5 together form a cover 1 in the form of a plate with smooth surfaces.
- Fig. 2 which shows a section of the housing of a processing machine
- the antenna cover 1 is flush mounted in a housing wall 6 of the processing machine.
- the housing wall 6 limits the processing space of the processing machine, which is in Fig. 2 right of the housing wall 6 and the cover 1 is located.
- the recess 4 is thus facing the processing space and the slot 3 facing away from the processing space.
- the antenna cover 1 closes off a cavity 7 in the housing of the processing machine for the processing space.
- a potting compound can be used as a non-conductive part 5 of the antenna cover 1, as a non-conductive part 5 of the antenna cover 1, a prefabricated molded part of a dielectric such as Al 2 O 3 .
- a molded part must be fastened in the cavity consisting of the slot 3 and the recess 4 in the metallic part 2, which can preferably be done by gluing to seal the cavity 7 with the antenna 8 as well as by a potting compound against the processing space.
- An antenna 8 is aligned within the cavity 7 in the direction of its largest geometric extension orthogonal to the direction of the largest geometric extension of the slot 3.
- the antenna 8 and the slot 3 are each in the middle of the direction of their each greatest geometric extent to the smallest mutual distance. This least mutual distance may be on the order of magnitude of the largest geometric extension of the antenna 8 or be less, as in Fig. 2 is shown.
- position of the antenna 8 to the slot 3 is to be understood only as an example and depends in each case on the directional characteristic of the antenna 8 and the polarization of the electromagnetic waves.
- the circumference of the slot 3 corresponds to the wavelength of the electromagnetic waves to be radiated or received by the antenna 8 which are to pass through the cover 1, in the material of the non-conducting part 3.
- the wavelength means the center frequency of the bandwidth of the antenna 8 the antenna 8 is designed narrowband.
- the recess 4 is not required. Rather, only one slot 3 without recess 4 can be provided. In this case, since the electromagnetic filtering action of the slit 3 depends on the ratio between the width of the slit 3 and the thickness of the metallic part 2, the thickness of the metallic part 2 must be adjusted to the width of the slit 3. The width of the slot 3 and the thickness of the metallic part 2 in the region of the slot 3 must approximately match, which in the in Fig. 2 shown thickness of the metallic part 2 applies only in the presence of the recess 4.
- a plurality of antennas 8 may be grouped side by side in front of one or more slots 3 in respective combination with recesses 4.
- the FIGS. 3 and 4 show two such embodiments in sectional views accordingly Fig. 2 ,
- the embodiment according to Fig. 3 differs from the one after Fig. 2 merely in that, instead of a single antenna 8, two antennas 8A and 8B are arranged next to each other adjacent to the single opening 3 and symmetrically to it.
- the two antennas 8A and 8B are each connected to separate communication modules to enable two-channel communication.
- the two channels differ in the frequency used, but this frequency spacing is small in relation to the width of the passband of the bandpass filter formed by the slot 3.
- the embodiment according to Fig. 4 differs from the one after Fig. 2 in that, instead of a single antenna 8 and a single opening 3, two antennas 8A and 8B are arranged side by side, and that each of these antennas 8A and 8B is assigned a separate opening 3A or 3B, respectively, adjacent to which the respective antenna 8A or 8A respectively 8B, in a position in which the slot 3A or 3B is at the level of the intensity maximum of the directional characteristic of the respective antenna 8A or 8B.
- the disadvantage of increased damping of the embodiment of Fig. 3 is thereby avoided, which is to be accepted, however, that here two non-conductive parts 5A and 5B are required, which are less resistant to loads from the processing space than the metallic part. 2
- a cover 11 instead of a slot or slot 3 and an opening in the form of a circular bore 13 may be mounted in a metallic part 12, the circumference in this case corresponds to the wavelength of the signals passing through the bore 13 should.
- a bore 13 concentric bore 14 is provided here with a larger diameter, which does not pass through the metallic part 12, but like the groove-shaped recess 4 has only a limited depth.
- the second, larger bore 14 is used for fixing a backfilling of the bore 13 with non-conductive potting compound which is also used here. Due to the shoulder at the end of the second bore 14, a positive connection results, through which the potting compound can withstand a force from the direction of the processing space.
- the viewing direction of Fig. 5 corresponds to that of Fig. 1 ,
- the antenna 18 is mounted in this embodiment of the cover 11 behind the center of the bore 13, as in the view of Fig. 3 is shown in dashed lines, since the antenna 18 is not visible in this view.
- the arrangement of a plurality of antennas 18 behind a bore thirteenth or more holes 13 side by side in a cavity located behind the cover 11 possible.
- the non-metallic part of the cover 11 is in Fig. 5 not shown, but of course also available in this embodiment.
- FIG Fig. 6 Another embodiment without a separate antenna 8 or 18 is shown in FIG Fig. 6 shown in which an antenna cover 21 in a relation to the FIGS. 1 and 5 opposite viewing direction is shown.
- the optimal location of these points is to be determined experimentally. The theory says that from the longitudinal end of the slot 23, a distance.
- the cover 21 is in this case itself a part of the antenna.
- the non-metallic part of the cover 21 is in Fig. 6 not shown, but of course also available in this embodiment.
- the antenna cover according to the invention is not limited to the embodiments described above, but may also have other than the shapes shown there. Although the formation of a recess on the side of the cover facing the processing space does promote mechanical strength, only one opening of constant cross-section over the thickness of the cover could be provided, which is filled by a nonconductive dielectric. Also, the opening could have a different shape than in the embodiments, for example, a cross or star shape. The decisive factor is that the dimensions of the opening are dimensioned such that electromagnetic signals in the frequency band for which the antenna is designed can pass through the opening. Notwithstanding the in Fig. 3 also shown, two antennas with the center of their longest extent each at the height of a slot and in the longitudinal direction of the slot next to each other be arranged. Such and similar modifications are at the discretion of the person skilled in the art and are intended to be encompassed by the protection of the claims.
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- Waveguide Aerials (AREA)
- Details Of Aerials (AREA)
- Support Of Aerials (AREA)
Abstract
Description
Die Erfindung betrifft eine Antennenabdeckung zum Abdecken mindestens einer Antenne gegenüber dem Bearbeitungsraum einer Bearbeitungsmaschine.The invention relates to an antenna cover for covering at least one antenna with respect to the processing space of a processing machine.
Die nähere Umgebung von Antennen wird im Allgemeinen als frei von elektrisch leitfähigen Materialien sowie überwiegend als zeitlich unveränderlich vorausgesetzt. Die Erfüllung dieser Bedingungen kann im harten Umfeld industrieller Anlagen nicht immer gegeben sein. Insbesondere drahtlose Datenverbindungen zu Geräten spanabhebender Metallbearbeitungsmaschinen sind geprägt durch die Präsenz von scharfkantigen Metallpartikeln und Spänen sowie aggressiven Flüssigkeiten im Bearbeitungsraum.The nearer surroundings of antennas are generally assumed to be free of electrically conductive materials and, as a rule, to be immutable in time. The fulfillment of these conditions may not always be possible in the harsh environment of industrial plants. In particular, wireless data connections to metal-cutting machines are characterized by the presence of sharp-edged metal particles and chips as well as aggressive liquids in the processing area.
Der Schutz von in und an diesen Maschinen angebrachten Antennen zur drahtlosen Datenübertragung wird meistens durch die Verwendung kompakter Antennentypen und deren Schutz durch Bedeckung mit nicht leitfähigen Körpern erzielt. Derartige Körper bestehen beispielsweise aus Kunststoff und können aufgrund ihrer geringen Steifigkeit nur begrenzt mechanische Belastungen aufnehmen. Zudem sind relativ großflächige bzw. großvolumige Schutzkörper selbst von mechanischer Schädigung, beispielsweise durch lange scharfkantige Metallspäne, bedroht.The protection of wireless data transmission antennas mounted in and on these machines is mostly achieved by the use of compact types of antennas and their protection by non-conductive body coverage. Such bodies are made of plastic, for example, and due to their low rigidity they can only absorb mechanical loads to a limited extent. In addition, relatively large-scale or large-volume protective body itself from mechanical damage, for example, by long sharp-edged metal chips, threatened.
Aus der
Die
Die Aufgabe der Erfindung ist es, eine zur Kommunikation innerhalb einer Bearbeitungsmaschine vorgesehene Antenne besonders wirksam gegenüber schädlichen Umgebungseinflüssen zu schützen.The object of the invention is to protect a provided for communication within a processing machine antenna particularly effective against harmful environmental influences.
Diese Aufgabe wird durch eine Abdeckung mit den Merkmalen des Anspruchs 1 gelöst. Zweckmäßige Weiterbildungen und vorteilhafte Ausgestaltungen der Erfindung sind in den Unteransprüchen angegeben.This object is achieved by a cover having the features of
Eine erfindungsgemäße Antennenabdeckung zum Abdecken mindestens einer Antenne gegenüber dem Bearbeitungsraum einer Bearbeitungsmaschine weist ein metallisches und ein nichtleitendes Teil auf. Das nichtleitende Teil füllt eine in dem metallischen Teil ausgebildete Öffnung aus, deren Umfang der Wellenlänge elektromagnetischer Wellen in dem nichtleitenden Material bei der Mittenfrequenz des Frequenzbereiches, für welchen die Antenne ausgelegt ist, entspricht. Die Abdeckung hat die Form einer Platte und bildet einen Teil einer den Bearbeitungsraum begrenzenden Gehäusewand der Bearbeitungsmaschine oder ist in eine solche Gehäusewand eingebaut.An antenna cover according to the invention for covering at least one antenna with respect to the processing space of a processing machine has a metallic and a non-conductive part. The non-conductive part fills an opening formed in the metallic part, the circumference of which corresponds to the wavelength of electromagnetic waves in the non-conductive material at the center frequency of the frequency range for which the antenna is designed. The cover has the shape of a plate and forms part of a housing wall bounding the processing space of the processing machine or is installed in such a housing wall.
Hierdurch ist eine sichere Trennung zwischen dem Einbauraum der Antenne und dem Bearbeitungsraum der Bearbeitungsmaschine gewährleistet und die dem Bearbeitungsraum zugewandte Oberfläche des nichtleitenden Teils ist sehr gering, so dass die Trennung überwiegend durch einen stabilen, gegenüber den schädlichen Umgebungseinflüssen der zuvor genannten Art unempfindlichen Metallkörper geschaffen wird. Zusätzlich werden durch die Wirkung des Schlitzes als Bandpassfilter für elektromagnetische Wellen Störungen außerhalb des für den Betrieb der Antenne vorgesehenen Frequenzbandes unterdrückt. Der Bearbeitungsraum wird durch den Einbau der Antenne und der Abdeckung in seiner Form und seinen Abmessungen nicht verändert. Die Abdeckung fügt sich glatt in eine metallische Oberfläche des Gehäuses der Bearbeitungsmaschine ein, wodurch eine Angriffsfläche bezüglich tangential entlang der entsprechenden Gehäuseoberfläche bewegter Metallspäne vermieden wird.This ensures a secure separation between the installation space of the antenna and the processing space of the processing machine and the processing space facing surface of the non-conductive part is very low, so that the separation is mainly provided by a stable, insensitive to the harmful environmental influences of the aforementioned type metal body. In addition, by the action of the slot as a band-pass filter for electromagnetic waves, noise outside the frequency band provided for the operation of the antenna is suppressed. The processing space is not changed by the installation of the antenna and the cover in its shape and dimensions. The cover blends smoothly into a metallic surface of the housing of the processing machine, thereby avoiding an engagement surface with respect to metal chips moved tangentially along the corresponding housing surface.
Die Öffnung in dem metallischen Teil kann insbesondere die Form eines geradlinigen Schlitzes oder eines Langlochs oder einer kreisförmigen Bohrung haben. Dabei sollte die geringste Querschnittsabmessung der Öffnung zumindest annähernd der Dicke des metallischen Teils in der Umgebung der Öffnung entsprechen, um die beabsichtigte Wirkung der Abdeckung als Bandpassfilter für elektromagnetische Wellen zu gewährleisten.In particular, the opening in the metallic part may have the shape of a rectilinear slit or a slot or a circular bore. In this case, the smallest cross-sectional dimension of the opening should at least approximately correspond to the thickness of the metallic part in the vicinity of the opening in order to ensure the intended effect of the cover as a bandpass filter for electromagnetic waves.
Von Vorteil ist es, wenn das metallische Teil auf derjenigen Seite der Abdeckung, welche dazu bestimmt ist, dem Bearbeitungsraum zugewandt zu sein, eine Vertiefung aufweist, welche die Öffnung auf besagter Seite umgibt, und das nichtleitende Teil die Vertiefung ebenfalls ausfüllt. Hierdurch wird das nichtleitende Teil mechanisch fest in dem metallischen Teil verankert und kann im Betrieb einer mechanischen Belastung aus Richtung des Bearbeitungsraumes, z.B. durch aufprallende Metallspäne, aufgrund einer formschlüssigen Abstützung an dem metallischen Teil widerstehen.It is advantageous if the metallic part has on the side of the cover which is intended to face the processing space, a recess which surrounds the opening on said side, and the non-conductive part also fills the recess. As a result, the non-conductive part is mechanically firmly anchored in the metallic part and can, during operation, generate a mechanical load from the direction of the machining space, e.g. by impacting metal chips, due to a positive support to the metallic part resist.
Besonders einfach kann die Herstellung der Abdeckung realisiert werden, indem das nichtleitende Teil aus einer Vergussmasse besteht, welche in den in dem metallischen Teil durch die Öffnung und gegebenenfalls durch eine die Öffnung umgebende Vertiefung gebildeten Hohlraum eingegossenen. Eine separate Herstellung des nichtleitenden Teils mit genau zu dem Hohlraum in dem metallischen Teil passenden Abmessungen erübrigt sich hierdurch. Alternativ kann als nichtleitendes Teil aber auch ein vorgefertigtes Formteil aus einem dielektrischen Material verwendet werden, das in den Hohlraum eingefügt und darin befestigt, beispielsweise eingeklebt ist. Als Material kommt beispielsweise Aluminiumoxidkeramik in Frage, die den Vorteil einer relativ großen elektrischen Permittivität hat. Hierdurch ergibt sich bei gegebener Frequenz eine Verringerung der Wellenlänge, die eine Verkleinerung der Abmessungen der Öffnung erlaubt, da diese von der Wellenlänge abhängig sind.The production of the cover can be realized in a particularly simple manner in that the non-conductive part consists of a potting compound which is cast into the cavity formed in the metallic part through the opening and optionally through a cavity surrounding the opening. A separate production of the non-conductive part with exactly to the cavity in the metallic part matching dimensions is unnecessary thereby. Alternatively, as a non-conductive part but also a prefabricated molded part of a dielectric material may be used, which is inserted into the cavity and fixed therein, for example, glued. As a material, for example, alumina ceramic comes into question, which has the advantage of a relatively large electrical Permittivity has. This results in a given frequency, a reduction in the wavelength, which allows a reduction in the dimensions of the opening, since they are dependent on the wavelength.
Es können auch mehrere Öffnungen in dem metallischen Teil vorgesehen sein, wobei jede Öffnung einer von mehreren vorhandenen Antennen zugeordnet und benachbart zu der ihr jeweils zugeordneten Antenne angeordnet ist. Dies ist von Vorteil, wenn Bedarf an einer mehrkanaligen Kommunikation besteht und hierzu mehrere Kommunikationsmodule mit jeweils eigenen Antennen eingesetzt werden sollen. Die Positionen der einzelnen Öffnungen können dann auf diejenigen der einzelnen Antennen abgestimmt werden, um die jeweilige Dämpfung der elektromagnetischen Wellen zu minimieren.Also, a plurality of openings may be provided in the metallic part, each opening being associated with one of a plurality of existing antennas and disposed adjacent to its respective associated antenna. This is advantageous if there is a need for multi-channel communication and for this purpose several communication modules, each with their own antennas to be used. The positions of the individual openings can then be matched to those of the individual antennas in order to minimize the respective attenuation of the electromagnetic waves.
Die Abdeckung kann selbst einen Teil der Antenne darstellen, indem die Antenne als Schlitzantenne ausgeführt ist, deren Schlitz durch den Schlitz der Abdeckung gebildet wird. Dies ergibt eine besonders flache Bauform der Antenne, da in diesem Fall nur ein HF-Kabel an der Rückseite an das metallische Teil herangeführt und an geeigneter Stelle mit diesem verbunden zu werden braucht.The cover may itself constitute part of the antenna by making the antenna a slot antenna whose slot is formed by the slot of the cover. This results in a particularly flat design of the antenna, since in this case only an RF cable needs to be brought to the back of the metallic part and connected at a suitable location with this.
Weitere Besonderheiten und Vorzüge der Erfindung ergeben sich aus der folgenden Beschreibung von bevorzugten Ausführungsbeispielen anhand der Zeichnung. Es zeigen:
- Fig.1
- eine erste Ausführungsform einer erfindungsgemäßen Abdeckung in einer Vorderansicht,
- Fig. 2
- eine Schnittansicht der in
Fig. 1 gezeigten Abdeckung längs der dortigen Linie A-A, - Fig. 2
- eine Schnittansicht entsprechend
Fig. 2 einer zweiten Ausführungsform, - Fig. 3
- eine Schnittansicht entsprechend
Fig. 2 einer dritten Ausführungsform, - Fig.5
- eine vierte Ausführungsform einer erfindungsgemäße Abdeckung in einer Vorderansicht und
- Fig. 6
- eine fünfte Ausführungsform einer erfindungsgemäßen Abdeckung in einer Rückseitenansicht.
- Fig.1
- A first embodiment of a cover according to the invention in a front view,
- Fig. 2
- a sectional view of in
Fig. 1 shown cover along the line AA there, - Fig. 2
- a sectional view accordingly
Fig. 2 a second embodiment, - Fig. 3
- a sectional view accordingly
Fig. 2 a third embodiment, - Figure 5
- a fourth embodiment of a cover according to the invention in a front view and
- Fig. 6
- a fifth embodiment of a cover according to the invention in a rear view.
Wie die
Gemäß
Alternativ zu einer Vergussmasse kann als nichtleitendes Teil 5 der Antennenabdeckung 1 auch ein vorgefertigtes Formteil aus einem Dielektrikum wie beispielsweise Al2O3 verwendet werden. Ein solches Formteil muss in dem aus dem Schlitz 3 und der Vertiefung 4 bestehenden Hohlraum in dem metallischen Teil 2 befestigt werden, was vorzugsweise durch Kleben erfolgen kann, um den Hohlraum 7 mit der Antenne 8 ebenso wie durch eine Vergussmasse gegenüber dem Bearbeitungsaum abzudichten.As an alternative to a potting compound can be used as a
Eine Antenne 8 ist innerhalb des Hohlraumes 7 in Richtung ihrer größten geometrischen Ausdehnung orthogonal zur Richtung der größten geometrischen Ausdehnung des Schlitzes 3 ausgerichtet. Die Antenne 8 und der Schlitz 3 weisen jeweils in der Mitte der Richtung ihrer jeweils größten geometrischen Ausdehnung den geringsten gegenseitigen Abstand auf. Dieser geringste gegenseitige Abstand kann in der Größenordnung der größten geometrischen Ausdehnung der Antenne 8 liegen oder geringer sein, wie es in
Der Umfang des Schlitzes 3 entspricht der Wellenlänge der von der Antenne 8 abzustrahlenden oder zu empfangenden elektromagnetischen Wellen, welche die Abdeckung 1 passieren sollen, in dem Material des nichtleitenden Teils 3. Hierbei ist mit der Wellenlänge die Mittenfrequenz der Bandbreite der Antenne 8 gemeint, wobei die Antenne 8 schmalbandig ausgelegt ist.The circumference of the
Die Vertiefung 4 wird nicht zwingend benötigt. Vielmehr kann auch lediglich ein Schlitz 3 ohne Vertiefung 4 vorgesehen werden. In diesem Fall muss eine Anpassung der Dicke des metallischen Teils 2 an die Breite des Schlitzes 3 erfolgen, da die elektromagnetische Filterwirkung des Schlitzes 3 von dem Verhältnis zwischen der Weite des Schlitzes 3 und der Dicke des metallischen Teils 2 abhängt. Die Weite des Schlitzes 3 und die Dicke des metallischen Teils 2 im Bereich des Schlitzes 3 müssen annähernd übereinstimmen, was bei der in
In anderen Ausführungsformen können innerhalb eines Hohlraumes 7 mehrere Antennen 8 nebeneinander vor einem oder mehreren Schlitzen 3 in jeweiliger Kombination mit Vertiefungen 4 gruppiert sein. Die
Die Ausführungsform nach
Die Ausführungsform nach
Wie
Die Ansichtsrichtung von
Eine weitere Ausführungsform ohne separate Antenne 8 bzw 18 ist in
Die erfindungsgemäße Antennenabdeckung ist nicht auf die vorstehend beschriebenen Ausführungsbeispiele beschränkt, sondern kann auch eine andere als die dort dargestellten Formen haben. So ist die Ausbildung einer Vertiefung auf der dem Bearbeitungsraum zugewandten Seite der Abdeckung zwar der mechanischen Belastbarkeit förderlich, doch es könnte auch nur eine Öffnung von über die Dicke der Abdeckung konstantem Querschnitt vorgesehen sein, die von einem nichtleitenden Dielektrikum ausgefüllt ist. Auch könnte die Öffnung eine andere Form als in den Ausführungsbeispielen haben, beispielsweise eine Kreuz- oder Sternform. Entscheidend ist, dass die Abmessungen der Öffnung so bemessen sind, dass elektromagnetische Signale in demjenigen Frequenzband, für welches die Antenne ausgelegt ist, die Öffnung passieren können. Abweichend von der in
Claims (8)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE201210000762 DE102012000762A1 (en) | 2012-01-18 | 2012-01-18 | antenna cover |
Publications (2)
Publication Number | Publication Date |
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EP2618425A1 true EP2618425A1 (en) | 2013-07-24 |
EP2618425B1 EP2618425B1 (en) | 2014-06-11 |
Family
ID=47049074
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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EP12189032.1A Active EP2618425B1 (en) | 2012-01-18 | 2012-10-18 | Antenna cover |
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EP (1) | EP2618425B1 (en) |
DE (1) | DE102012000762A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2524815A (en) * | 2014-04-03 | 2015-10-07 | Naim Audio Ltd | Electronic multimedia device antenna configuration |
US9600759B2 (en) | 2013-09-12 | 2017-03-21 | Reishauer Ag | RFID identification of metal interchangeable parts for machine tools |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2018029308A1 (en) | 2016-08-12 | 2018-02-15 | Big Kaiser Präzisionswerkzeuge Ag | Boring head with an electronic unit |
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US4287520A (en) * | 1979-11-09 | 1981-09-01 | The United States Of America As Represented By The Secretary Of The Air Force | Slot chevron element for periodic antennas and radomes |
US4763130A (en) * | 1987-05-11 | 1988-08-09 | General Instrument Corporation | Probe-fed slot antenna with coupling ring |
EP0683542A2 (en) * | 1994-05-20 | 1995-11-22 | Mitsubishi Denki Kabushiki Kaisha | Omnidirectional slot antenna |
US5767789A (en) | 1995-08-31 | 1998-06-16 | International Business Machines Corporation | Communication channels through electrically conducting enclosures via frequency selective windows |
EP1112810A1 (en) | 1998-08-08 | 2001-07-04 | NT Engineering Kabushiki Kaisha | Machine tool and method of communication |
DE102006026014A1 (en) | 2005-06-01 | 2006-12-14 | Hardy Zissel | Transponder e.g. high frequency identification transponder, arrangement for e.g. motor vehicle, has connection formed between transponder and antenna, which is formed in metallic component by recess, for transferring signals |
US20080150691A1 (en) * | 2006-12-20 | 2008-06-26 | Symbol Technologies, Inc. | Frequency selective surface aids to the operation of RFID products |
US20090153412A1 (en) * | 2007-12-18 | 2009-06-18 | Bing Chiang | Antenna slot windows for electronic device |
DE102007061707A1 (en) | 2007-12-19 | 2009-06-25 | Technische Universität München | Industrial truck with an RFID-based device for the identification of cargo |
DE102008023224A1 (en) | 2008-05-10 | 2009-11-12 | Ott-Jakob Spanntechnik Gmbh | Device for the wireless transmission of signals between two parts of a processing machine |
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2012
- 2012-01-18 DE DE201210000762 patent/DE102012000762A1/en not_active Withdrawn
- 2012-10-18 EP EP12189032.1A patent/EP2618425B1/en active Active
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US4287520A (en) * | 1979-11-09 | 1981-09-01 | The United States Of America As Represented By The Secretary Of The Air Force | Slot chevron element for periodic antennas and radomes |
US4763130A (en) * | 1987-05-11 | 1988-08-09 | General Instrument Corporation | Probe-fed slot antenna with coupling ring |
EP0683542A2 (en) * | 1994-05-20 | 1995-11-22 | Mitsubishi Denki Kabushiki Kaisha | Omnidirectional slot antenna |
US5767789A (en) | 1995-08-31 | 1998-06-16 | International Business Machines Corporation | Communication channels through electrically conducting enclosures via frequency selective windows |
EP1112810A1 (en) | 1998-08-08 | 2001-07-04 | NT Engineering Kabushiki Kaisha | Machine tool and method of communication |
DE102006026014A1 (en) | 2005-06-01 | 2006-12-14 | Hardy Zissel | Transponder e.g. high frequency identification transponder, arrangement for e.g. motor vehicle, has connection formed between transponder and antenna, which is formed in metallic component by recess, for transferring signals |
US20080150691A1 (en) * | 2006-12-20 | 2008-06-26 | Symbol Technologies, Inc. | Frequency selective surface aids to the operation of RFID products |
EP2095291B1 (en) | 2006-12-20 | 2011-02-16 | Symbol Technologies, Inc. | Frequency selective surface aids to the operation of rfid products |
US20090153412A1 (en) * | 2007-12-18 | 2009-06-18 | Bing Chiang | Antenna slot windows for electronic device |
DE102007061707A1 (en) | 2007-12-19 | 2009-06-25 | Technische Universität München | Industrial truck with an RFID-based device for the identification of cargo |
DE102008023224A1 (en) | 2008-05-10 | 2009-11-12 | Ott-Jakob Spanntechnik Gmbh | Device for the wireless transmission of signals between two parts of a processing machine |
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Publication number | Priority date | Publication date | Assignee | Title |
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US9600759B2 (en) | 2013-09-12 | 2017-03-21 | Reishauer Ag | RFID identification of metal interchangeable parts for machine tools |
GB2524815A (en) * | 2014-04-03 | 2015-10-07 | Naim Audio Ltd | Electronic multimedia device antenna configuration |
GB2524815B (en) * | 2014-04-03 | 2016-05-11 | Naim Audio Ltd | Electronic device housing including a heat exchanger with an integrated antenna |
Also Published As
Publication number | Publication date |
---|---|
DE102012000762A1 (en) | 2013-07-18 |
EP2618425B1 (en) | 2014-06-11 |
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