EP3016201A1 - Dispositif d'antenne - Google Patents

Dispositif d'antenne Download PDF

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Publication number
EP3016201A1
EP3016201A1 EP14190924.2A EP14190924A EP3016201A1 EP 3016201 A1 EP3016201 A1 EP 3016201A1 EP 14190924 A EP14190924 A EP 14190924A EP 3016201 A1 EP3016201 A1 EP 3016201A1
Authority
EP
European Patent Office
Prior art keywords
slot
antenna
slot antenna
antenna device
circuit board
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
Application number
EP14190924.2A
Other languages
German (de)
English (en)
Other versions
EP3016201B1 (fr
Inventor
Matthias Lungwitz
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Gigaset Communications GmbH
Original Assignee
Gigaset Communications GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Gigaset Communications GmbH filed Critical Gigaset Communications GmbH
Priority to EP14190924.2A priority Critical patent/EP3016201B1/fr
Publication of EP3016201A1 publication Critical patent/EP3016201A1/fr
Application granted granted Critical
Publication of EP3016201B1 publication Critical patent/EP3016201B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
    • H01Q1/38—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith formed by a conductive layer on an insulating support

Definitions

  • the present invention relates to the field of antenna technology. It relates to an antenna device with at least two slot antennas for transmitting and / or receiving electromagnetic waves of a wavelength ⁇ , wherein each slot antenna has a metallically conductive surface in which a slot, in particular with a length of ⁇ / 2, is formed.
  • the invention relates to a radio device with such an antenna device and a key fob, which has such a radio device.
  • the known conflict is that the electromagnetic field of the antenna device is at least partially shielded by the metallic housing of the radio application. As a rule, this results in a change in the emission characteristic. This can be used advantageously in certain applications to achieve a desired directivity of the antenna device. In other applications, especially in mobile radio applications, a more spherical radiation characteristic is desirable due to any alignability of the radio application with respect to a radio partner.
  • the object of the invention is to provide an antenna device which allows a formation of a radio application with a metallic housing and an approximately spherical radiation characteristic.
  • an antenna device is provided with at least two slot antennas for transmitting and / or receiving electromagnetic waves of a wavelength ⁇ , wherein each slot antenna has a metallically conducting surface in which a slot, in particular with a length of ⁇ / 2, is formed Surfaces with a distance d smaller than ⁇ / 10 are arranged parallel to each other, so that between two surfaces a flat space is formed, the flat space is at least partially closed by at least one metallic conductive side surface, the metallic conductive surfaces over at least one metallic conductive side surface are electrically conductively connected to each other, the slots are formed uniformly in the metallic conductive surfaces, the uniform slots are arranged congruent to each other and wherein at least one slot antenna is formed as a first slot antenna, the one n signal terminal, via which it is electrically excitable, and at least one slot antenna is designed as a second slot antenna, the no signal connection wherein the second slot antenna is electromagnetically excitable by the first slot antenna.
  • Such an antenna device has the advantage that the at least two slot antennas interact and together have an approximately symmetrical, approximately spherical radiation characteristic.
  • the second slot antenna is operated in resonance with the first slot antenna.
  • the electromagnetic field emitted by the first slot antenna may be viewed with respect to its surface as being radiated on either side of the surface.
  • that side of the surface which is arranged in the direction of the second slot antenna is referred to as lying inside
  • that side of the surface, which is arranged facing away from the second slot antenna is referred to as lying outside.
  • the field radiated from the inside of the first slot antenna excites the second slot antenna from its inside.
  • the thus excited second slot antenna in turn transmits its electromagnetic field to the inside as well as to the outside such that substantially equal fields are formed on both sides of the slot antenna.
  • the energy given in from the first slot antenna becomes predominantly through the second slot antenna delivered to the outside.
  • the outer sides of the surfaces radiate together, so to speak an electromagnetic field, which corresponds to that of a dipole and thus is approximately spherical.
  • a housing is advantageously formed by the first slot antenna, by the second slot antenna and the at least one metallically conductive lateral surface, that is designed to house an electrical circuit, in particular a radio circuit.
  • a metallic housing is possible, which is suitable for receiving radio applications, such as a radio key, a signal generator or the like, which has an integrated antenna and whose antenna has a nearly spherical radiation characteristic.
  • radio applications such as a radio key, a signal generator or the like
  • Both cuboid and round, for example, cylindrical housing can be formed.
  • the lateral surface and the surface of a slot antenna can adjoin one another or merge into one another such that they are formed as a quasi-single, for example concave surface.
  • the housing has, for example, a lens mold.
  • the housing is completely closed by the first and the at least one second slot antenna, so that from the interior of the housing energy in electromagnetic form can only be delivered via the slots of the slot antennas, which form the housing. Further advantageous is formed by the housing formed an outer housing.
  • An outer metallic housing offers special possibilities with regard to a desired design, in particular a look and feel.
  • the first slot antenna on a circuit board whose metallic surface forms the metallically conductive surface and wherein the slot as a recess in the metallic surface of the circuit board is formed.
  • the electrical circuit is at least partially disposed on the circuit board and electrically connected to the signal terminal of the first slot antenna.
  • the signal connection can be made, for example, via a balanced or unbalanced line with, for example, one or more feed points.
  • the first and the second slot antenna advantageously have the same shortening factor.
  • the first and second slot antennas advantageously have the same dimensions and the slots have the same dielectrics.
  • the slot in the first slot antenna may be formed by a recess in the conductive layer or conductive layers of a printed circuit board.
  • the flat gap in the region of the slot antenna to achieve a uniform shortening factor is filled with a mass having the dielectric constant of the circuit board.
  • the design of the flat gap with materials of the same wavelength can by the use of one or more Plastic elements are used, which are used between PCB and housing.
  • the gap may be ejected with a dielectric mass.
  • the slot can also be mechanically closed to the outside at the same time.
  • components of the electrical circuit in the plane of the circuit board to the slot in the circuit board at least a distance of one-fifth of the distance d of the surfaces of the slot antennas to each other, in particular at least one distance of one millimeter.
  • the slot is arranged in the edge region of the surface.
  • a positioning of the slot in the edge region of the surface of the slot antenna allows a good utilization of the flat gap, in particular for the arrangement of larger components such as a flat battery cell.
  • the antenna device advantageously comprises two second slot antennas and a first slot antenna, the second slot antennas forming a cavity together with the at least one side face and the first slot antenna being arranged in the cavity.
  • the first slot antenna on both sides becomes a second slot antenna according to the principle already described stimulated. If the cavity is electromagnetically closed apart from the slots, radiation takes place exclusively via the two second slot antennas.
  • a spherical radiation characteristic is supported by the symmetrical arrangement.
  • such an embodiment offers the advantage that it is robust and at the same time very easy to produce.
  • the cavity is advantageously formed by a metal-conductive extruded profile, in particular based on a rectangular profile.
  • the longitudinal and transverse surfaces of the extruded profile are electrically conductively connected to each other. Furthermore, the surfaces of the second slot antennas and through the transverse surfaces of the extruded profile two lateral surfaces can be formed by the longitudinal surfaces of the extruded profile. The ends of the extruded profile can be closed off by caps, lids or inserts, in particular in metallic design.
  • the first slot antenna in the cavity on / executable in this case, the first slot antenna, for example, in grooves that can be arranged in the lateral surfaces, inserted.
  • the first slot antenna for example, in grooves that can be arranged in the lateral surfaces, inserted.
  • Such an embodiment in particular in the formation of the slot antenna from a printed circuit board, offers the advantage of easy manufacturability.
  • such a drawer or box principle offers the opportunity to remove the slot antenna, for example, to change a arranged on the same circuit board battery.
  • the housing is advantageously completely metallically conductive and Completely completed, so that from the inside of the housing energy in electromagnetic form can be emitted only through the slots of the slot antennas.
  • a second slot antenna in combination with a lateral surface forms an overall round, concave surface.
  • This is in the form of a hood suitable to cover a first, possibly flat slot antenna.
  • the first slot antenna can be covered on its second side by a second, likewise concave-shaped second slot antenna, so that overall a lenticular arrangement can be formed.
  • the edges of the concave surfaces for electromagnetic sealing and for producing an electrical connection with each other are compressible.
  • a light-emitting means in particular a luminescent diode, is arranged in the flat intermediate space, from which light can be emitted to the outside through at least one of the slots of the antenna device.
  • a light-emitting means in particular a luminescent diode
  • the flat intermediate space furthermore advantageously has a light-sensitive component, in particular a photoresistor or a photodiode, from which light incident through at least one of the slots in the antenna device can be detected.
  • the shape of the slots in the surfaces of the slot antennas is adapted to the outer contour of the surface.
  • the metallic surfaces have an at least partially round shape, wherein the slots have an arc shape or a C-shape.
  • the metallic surfaces have a rectangular shape, wherein the slots have an L-shape or an I-shape.
  • the invention further provides a radio device with an antenna device according to one of the previously described embodiments, in which the radio device has a radio circuit formed electrical circuit and a power source, which are arranged in the flat gap, and wherein the electrical circuit with the signal terminal of the antenna device electrically connected is.
  • a radio application has a metallic housing with an integrated antenna device and an approximately spherical radiation characteristic.
  • the radio device is advantageously designed such that the first slot antenna is formed from a printed circuit board and the energy source is arranged on the circuit board.
  • the radio device has a wake-up mechanism, via which it can be put into operation without electrical contact.
  • the radio device is designed, for example, such that the at least one metallically conductive lateral surface or several metallically conductive lateral surfaces completely enclose the flat intermediate space and the radio circuit has a reed contact, via which it magnetically is controllable.
  • Such an embodiment offers the advantage that the radio circuit can be put into operation by applying a magnetic field despite a closed, metallically conductive housing.
  • a key fob wherein the fob has a radio device according to one of the previously described embodiments and the antenna device forms the housing of the key fob.
  • the key fob has a passage, in particular for the affiliation of a key ring, wherein the diameter 2r of the passage with 2r ⁇ ⁇ is well below the wavelength ⁇ .
  • the metallic surfaces of the slot antennas each have the slot in a first edge region and the passage in each case in a second edge region, wherein the first edge region is arranged opposite the second edge region on the surface.
  • Common keys have a key head with a hole or passage and a key bit.
  • keys and key fobs When keys and key fobs are placed together on a key ring, their orientation is often synchronized due to the orientation of their passages through the key ring and the orientation of the key bit due to gravity. This means that the heads of several keys or even a key head and the key fob often come right next to each other or lie on each other.
  • the key fob has the previously described embodiment, and the diameter of an example round key fob is greater than that of an average wrench, the risk of obscuring a slot by the arrangement of the slot in the passage opposite edge region can be significantly reduced.
  • the key fob has a luminous means, in particular a light-emitting diode, from which light can be emitted to the outside through at least one of the slots of the antenna device.
  • a luminous means in particular a light-emitting diode
  • the key fob has a slot-covering plastic film or a dielectric compound, then this is advantageously transparent.
  • the key fob has at least one light guide. there the at least one light guide is arranged such that light can be transmitted from the light-emitting diode to at least one slot by the at least one light guide.
  • the aforementioned method offers the advantage that a layered structure of the antenna device takes place, which entails a series of manufacturing advantages.
  • FIG. 1 shows a perspective view of a first embodiment of a wireless device 100 according to the invention based on a first embodiment of an antenna device 1 according to the invention.
  • the antenna device 1 off Fig. 1 comprises two slot antennas 2, 3 for transmitting and / or receiving electromagnetic waves of a wavelength ⁇ , each slot antenna 2, 3 having a metallically conductive surface 4, in which a slot 5, in particular with a length of ⁇ / 2, is formed.
  • the surfaces 4 are arranged at a distance d smaller than ⁇ / 10 parallel to each other, so that between two surfaces 4, a flat gap is formed.
  • the flat space is circumferentially closed by a plurality of metallically conductive side surfaces 6.
  • the metallically conductive surfaces 4 are electrically conductively connected to one another via the metallically conductive lateral surfaces 6.
  • a slot antenna 2, 3 is formed as the first slot antenna 2, by having a signal terminal 7, via which it is electrically excitable.
  • a further slot antenna 2, 3 is designed as a second slot antenna 3 in that it has no signal connection 7.
  • the second slot antenna 3 is arranged parallel to the first slot antenna 2 so as to be electromagnetically excitable therefrom.
  • an outer casing of a radio circuit 100 which houses an electric circuit 8, a power source 9 and an LED 10.
  • the housing is closed by the first slot antenna 2, the second slot antenna 3 and the metallically conductive side surfaces 6, so that from the interior of the housing energy in electromagnetic form via the slots 5 of the slot antennas 2, 3 can be issued.
  • the first slot antenna 2 is formed of a printed circuit board whose metallic surface forms the metallic conductive surface 4, and wherein the slot 5 is formed by a recess in the metallic surface of the printed circuit board.
  • the signal terminal 7 of the slot antenna 2 is likewise formed from one, possibly the same metallic surface of the printed circuit board. It connects the first slot antenna 2 to the electrical circuit 8, which is arranged on the same circuit board.
  • the power source 9 in the form of a button cell and the LED 10 are arranged on the same circuit board.
  • the components of the electrical circuit 8, the power source 9 and the LED 10 have in the plane of the circuit board to the slot 5 in the circuit board a distance of more than one fifth of the distance d of the surfaces 4 of the slot antennas 2, 3 to each other.
  • the gap between the first slot antenna 2 and the second slot antenna 3, not shown in the drawing, is filled with a ground having the same dielectric constant as the circuit board. An electromagnetic wave is therefore not broken at the transition between the printed circuit board and the gap, the wavelength is not changed.
  • the first slot antenna 2 and the second slot antenna 3 have the same dimensions. At the same time the mass closes the slot 5 of the first slot antenna 2. The mass is formed transparent, so that light of the LED 10 is radiated through the slots 5 of the antenna device 1 and the radio device 100 to the outside.
  • the radio arrangement 100 is painted.
  • the slot 5 in the second slot antenna 3 is not visible.
  • a lacquer layer or a plastic layer is advantageously designed such that it is at least partially translucent.
  • the slot 5 is arranged in the edge region of the metallically conductive surface 4, so that in the flat space, the arrangement of larger components such as the power source 9 could take place in the form of a flat battery cell, without violating the minimum distance to the slots 5.
  • the shape of the slots 5 in the surfaces 4 of the slot antennas 2, 3 adapted to the outer contour of the surface 4.
  • a passage 11 for attaching the radio arrangement 100 to a key ring has a diameter 2r, which is significantly below the wavelength ⁇ with 2r ⁇ ⁇ .
  • the slots 5 of the slot antennas 2, 3 are each arranged in a first edge region of the surfaces 4, which in each case lies opposite a second edge region, in which the passage 11 is arranged, on the surfaces 4.
  • FIG. 2 shows a perspective view of a second embodiment of an antenna device 1 according to the invention.
  • the second embodiment of an antenna device 1 corresponds to that of the first embodiment, with the difference that the antenna device 1, two second slot antennas 3 and a first slot antenna 2, wherein the second slot antennas 3 together with metallic side surfaces 6 form a cavity, and in the cavity, the first slot antenna 2 is arranged.
  • the first slot antenna 2 in the direction 12 from the cavity executable, or opposite to the direction 12 in the cavity 12 can be inserted.
  • the first slot antenna 2 is formed as in the first embodiment of a printed circuit board.
  • a drawer or box principle offers the possibility of taking out the first slot antenna 2, for example to provide an energy source 9 arranged on the same circuit board, i. For example, a battery to change.
  • radiation takes place via the second slot antennas 3, which are equally excitable by the first, centrally located slot antenna 2.
  • the symmetry of the arrangement supports the approximately spherical radiation characteristic.
  • FIG. 3 shows a perspective view of a first embodiment of a key fob 200 according to the invention based on a third embodiment of an antenna device according to the invention 1.
  • the structure of the antenna device corresponds to that of the first embodiment.
  • the passage 11 of the key fob 200 is arranged in each case in an edge region of the slot antennas 2, 3, which in each case another edge region, in each of which the slot 5 is arranged is on the surface 4 of the slot antenna 2, 3 opposite.
  • FIGS. 5 and 6 show by way of example the emission characteristic of an embodiment according to Fig. 3 in the horizontal as well as the vertical plane.
  • FIG. 4 shows a vertical section of a second embodiment of a key fob 200 according to the invention based on a fourth embodiment of an antenna device according to the invention 1.
  • the surfaces 4 of the second slot antennas 3 in combination with the side surfaces 6 form a total round, concave surface.
  • the combination of the metallically conductive surface 4 and in this case annular metallic conductive side surface 6 each forms the shape of a hood. This hood can also be made in one piece.
  • a first, planar slot antenna 2 is covered by both sides, so that overall results in a lenticular arrangement.
  • In its structure and mode of operation corresponds to the key fob 200 in the Fig. 2 shown embodiment of a radio arrangement 100. From the perspective of the axial axis 13 corresponds to the appearance of the in Fig. 3 shown embodiment.
  • FIG. 5 shows the radiation characteristic of a pattern of a key fob according to Fig. 3 in the vertical plane.
  • One is to the axes of a Cartesian coordinate system approximately symmetrical radiation and radially overall a roughly uniform radiation visible.
  • FIG. 6 shows the radiation characteristic of a pattern of a key fob according to Fig. 3 in the horizontal plane.
  • the expected radiation characteristic of a dipole can be seen slightly rotated by 30 °.
  • antenna device 1 First slot antenna 2
  • Second slot antenna 3 Metallic conductive surface 4 distance d slot 5
  • Metallically conductive lateral surface 6 signal connection 7
  • Electrical circuit 8th energy 9

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EP14190924.2A 2014-10-29 2014-10-29 Dispositif d'antenne Active EP3016201B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP14190924.2A EP3016201B1 (fr) 2014-10-29 2014-10-29 Dispositif d'antenne

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP14190924.2A EP3016201B1 (fr) 2014-10-29 2014-10-29 Dispositif d'antenne

Publications (2)

Publication Number Publication Date
EP3016201A1 true EP3016201A1 (fr) 2016-05-04
EP3016201B1 EP3016201B1 (fr) 2021-09-08

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EP14190924.2A Active EP3016201B1 (fr) 2014-10-29 2014-10-29 Dispositif d'antenne

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020052885A1 (fr) * 2018-09-13 2020-03-19 Endress+Hauser SE+Co. KG Dispositif de transmission de signaux d'un boîtier au moins partiellement métallique
DE102019108359A1 (de) * 2019-03-30 2020-10-01 Endress+Hauser SE+Co. KG Vorrichtung zur Übertragung von Signalen aus einem zumindest teilweise metallischen für den Einsatz in einem explosionsgefährdeten Bereich ausgebildeten Gehäuse

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5917454A (en) * 1997-08-22 1999-06-29 Trimble Navigation Limited Slotted ring shaped antenna
US20040239575A1 (en) * 2002-07-19 2004-12-02 Hideaki Shoji Antenna device and portable radio communication terminal
US8779998B1 (en) * 2010-09-21 2014-07-15 The United States Of America, As Represented By The Secretary Of The Navy Wideband horizontally polarized omnidirectional antenna

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5917454A (en) * 1997-08-22 1999-06-29 Trimble Navigation Limited Slotted ring shaped antenna
US20040239575A1 (en) * 2002-07-19 2004-12-02 Hideaki Shoji Antenna device and portable radio communication terminal
US8779998B1 (en) * 2010-09-21 2014-07-15 The United States Of America, As Represented By The Secretary Of The Navy Wideband horizontally polarized omnidirectional antenna

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020052885A1 (fr) * 2018-09-13 2020-03-19 Endress+Hauser SE+Co. KG Dispositif de transmission de signaux d'un boîtier au moins partiellement métallique
CN112673523A (zh) * 2018-09-13 2021-04-16 恩德莱斯和豪瑟尔欧洲两合公司 用于从至少部分金属性的外壳传送信号的装置
US20220037760A1 (en) * 2018-09-13 2022-02-03 Endress+Hauser SE+Co. KG Apparatus for transferring signals from an at least partially metallic housing
DE102019108359A1 (de) * 2019-03-30 2020-10-01 Endress+Hauser SE+Co. KG Vorrichtung zur Übertragung von Signalen aus einem zumindest teilweise metallischen für den Einsatz in einem explosionsgefährdeten Bereich ausgebildeten Gehäuse
US11699857B2 (en) 2019-03-30 2023-07-11 Endress+Hauser SE+Co. KG Device for transferring signals from an at least partially metal housing designed for use in an explosion-prone region

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