EP2293381A1 - Agencement d'antennes - Google Patents

Agencement d'antennes Download PDF

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Publication number
EP2293381A1
EP2293381A1 EP09011000A EP09011000A EP2293381A1 EP 2293381 A1 EP2293381 A1 EP 2293381A1 EP 09011000 A EP09011000 A EP 09011000A EP 09011000 A EP09011000 A EP 09011000A EP 2293381 A1 EP2293381 A1 EP 2293381A1
Authority
EP
European Patent Office
Prior art keywords
circuit board
antenna
printed circuit
narrow
antenna section
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
EP09011000A
Other languages
German (de)
English (en)
Other versions
EP2293381B1 (fr
Inventor
Wolfgang Dörr
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.)
Delphi International Operations Luxembourg SARL
Original Assignee
Delphi Technologies Inc
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 Delphi Technologies Inc filed Critical Delphi Technologies Inc
Priority to EP09011000.8A priority Critical patent/EP2293381B1/fr
Priority to US12/868,113 priority patent/US20110050506A1/en
Priority to CN201010267410.4A priority patent/CN102005642B/zh
Publication of EP2293381A1 publication Critical patent/EP2293381A1/fr
Application granted granted Critical
Publication of EP2293381B1 publication Critical patent/EP2293381B1/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
    • H01Q7/00—Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49002—Electrical device making
    • Y10T29/49016—Antenna or wave energy "plumbing" making
    • Y10T29/49018—Antenna or wave energy "plumbing" making with other electrical component
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49002—Electrical device making
    • Y10T29/49117—Conductor or circuit manufacturing
    • Y10T29/49124—On flat or curved insulated base, e.g., printed circuit, etc.
    • Y10T29/49155—Manufacturing circuit on or in base
    • Y10T29/49165—Manufacturing circuit on or in base by forming conductive walled aperture in base

Definitions

  • the present invention relates to an antenna assembly comprising a printed circuit board and an antenna carried by the printed circuit board.
  • Such antenna arrangements are basically known and are used, for example, as transmitting antennas in hand transmitters or electronic keys with which, for example, Motor vehicles can be locked and unlocked remotely or garage doors can be opened and closed.
  • the known antenna arrangements prove to be disadvantageous in that they have a comparatively low antenna efficiency. That is, the useful transmission power radiated by the antenna is relatively small compared to the power consumption of the antenna required for this purpose.
  • the present invention is therefore based on the object to provide an antenna arrangement of the type mentioned, which has an increased antenna efficiency.
  • the antenna arrangement according to the invention comprises a printed circuit board which has an upper side and a lower side, and an antenna, in particular a ring antenna, which is supported by the printed circuit board and comprises at least one electrically conductive antenna section which is arranged on a narrow side of the printed circuit board which adjoins the upper side and / or lower side is.
  • the efficiency of the antenna arrangement is impaired, in particular, by line losses in the line path of the antenna and by dielectric losses in the dielectric material of the circuit board.
  • the reason for the problem of high line losses is not least the skin effect, which is particularly pronounced at frequencies suitable for the operation of the antenna arrangement.
  • the skin effect refers to the phenomenon that an alternating current flowing inside a conductor increasingly counteracts eddy currents that are induced by the alternating current inside the conductor and thus reduce the net current flow, so that the current flow from the center of the conductor to the edge the head is relocated.
  • essentially only the edge of the conductor contributes to the current conduction, and the effective resistance of the conductor increases.
  • the power is not very efficient conducts, because the surface of the circuit board and thus also the conductor in this edge region usually have a high roughness and the current path is extended accordingly in this area.
  • the printed circuit board carrying the antenna preferably consists entirely of electrically nonconductive, dielectric material.
  • the circuit board may be laminated from a plurality of dielectric layers.
  • the inventive construction of a conductive antenna section on a narrow side of the circuit board creates an electrical current path with good power line properties and thus reduces the line losses incurred by the antenna.
  • An advantage of a narrow side mounted conductive antenna section here is that the antenna section itself does not take up space on the top or bottom. Thus, even with little space on the top and bottom of the circuit board, a relatively large electrically conductive antenna section can be realized and thus increased conductivity of the antenna can be achieved.
  • a narrow-side antenna section is particularly advantageous if the antenna is an annular antenna and has a current path which extends at least substantially annularly in the plane of the printed circuit board.
  • a narrow-side antenna section here has at least approximately the shape of a jacket segment, resulting in a particularly good Abstrahls characterizing leads and contributes to increased antenna efficiency.
  • the antenna arrangement according to the invention thus has an improved antenna efficiency, which ultimately not only increases the antenna range, but also the energy consumption is reduced.
  • the arranged on the narrow side conductive antenna portion preferably comprises a metallic material, in particular copper or gold.
  • the conductive narrow-side antenna section is preferably a metallic layer, arranged on the narrow side, with a substantially constant thickness, which is, for example, several 10 ⁇ m.
  • the narrow side of the printed circuit board adjoins the upper side and / or the lower side of the printed circuit board.
  • the narrow side may extend substantially perpendicular to the top or bottom of the circuit board. It is preferable if the narrow side extends from the upper side to the lower side of the printed circuit board and thus thus through the printed circuit board. In this case, the narrow side provides a particularly large area for the arranged on the narrow side antenna section.
  • the narrow side may delimit a hole of the printed circuit board extending through the printed circuit board, which is preferably elongate.
  • the narrow side may form an outer side of the printed circuit board. If the narrow-side antenna section borders on a hole or an outer side of the printed circuit board, then there is less dielectric printed circuit board material in the direct vicinity of the narrow-side antenna section, whereby the dielectric losses of the electromagnetic field generated by a current flowing in the narrow-side antenna section are reduced.
  • such narrow sides can be particularly easily formed, for example by holes are formed in the circuit board by a milling process or by the outer contour of the circuit board is cut by a milling process accordingly.
  • the narrow-side antenna section does not form a closed electrically conductive ring. If the narrow side on which the antenna section is attached delimits a hole in the printed circuit board, the antenna section is preferably attached only to a partial region of the narrow side delimiting the hole, without forming a closed ring in the hole.
  • Such a narrow-side antenna section can be produced in a simple manner by completely coating a narrow side delimiting a hole with electrically conductive material and subsequently removing unwanted electrically conductive material.
  • the antenna section arranged on the narrow side is in accordance with a preferred embodiment with an antenna section running on the upper side and / or with one on the lower side extending antenna section connected.
  • the narrow-side antenna section may be connected along its at least approximately entire length to the antenna section running on the upper or lower side.
  • two narrow-side antenna sections are connected on opposite sides of an antenna section running on the top side or of an antenna section running on the underside.
  • the two narrow-side and the upper and / or lower-side antenna section thus form two angles, in the peaks of which higher currents can flow, whereby the conductivity of the antenna section as a whole is increased even further.
  • the antenna section arranged on the narrow side extends through the printed circuit board and connects an antenna section arranged on the upper side of the printed circuit board to an antenna section arranged on the lower side of the printed circuit board.
  • an upper-side and a lower-side antenna section are interconnected by two opposite narrow-side antenna sections. In this way, four antenna section angles are formed and an even higher current flow and antenna efficiency are achieved.
  • the antenna section arranged on the narrow side interrupts one of the top side and bottom side of the printed circuit board first antenna section electrically bridged.
  • the narrow-side antenna section additionally connect the first antenna section to a second antenna section extending on the lower or upper side.
  • An interruption of the antenna portion of the top or bottom of the circuit board may serve to accommodate other circuit parts mounted on the top or bottom of the circuit board, such as a circuit through the interruption to interconnect various circuit parts or components.
  • the circuit board may carry other circuit parts, e.g. be made in common process steps with the antenna, for example, connecting lines and pads for more arranged on the circuit board circuit parts.
  • antenna sections arranged on the top and / or bottom side of the printed circuit board can be connected in a common process step with the further circuit parts, such as e.g. Connecting lines and pads are formed.
  • Such other circuit parts may e.g. to a drive circuit which applies a drive signal to the antenna mounted on the printed circuit board or, in the case of a receive antenna, to a receive and evaluate circuit.
  • the antenna is preferably driven with frequencies in the range between 300 and 1000 MHz.
  • Another object of the invention is a method having the features of claim 8.
  • the inventive method can in particular for producing an antenna arrangement of the type described above. The advantages explained above thus apply accordingly.
  • an electrically conductive material is applied to a narrow side of the printed circuit board which adjoins the upper side and / or the underside of the printed circuit board.
  • the narrow side of the printed circuit board is produced by removing printed circuit board material, in particular by forming a, in particular elongated, hole in the printed circuit board, for example by a drilling or milling process. Drilling and milling processes for printed circuit boards are known per se and can be accomplished in a simple manner with available tools and machines.
  • a plurality of holes are produced in the circuit board along the desired antenna track for a plurality of narrow-side antenna sections.
  • Known drilling or milling machines can produce such a variety of holes with high precision and high speed using an electronic layout, such as a CAD layout.
  • via holes and narrow side (s) simplifies the antenna array fabrication process by eliminating the need for a separate process step of removing printed circuit board material to create the narrow side (s).
  • the via holes and the narrow side (s) can thus be produced in particular in one and the same machine tool, without the circuit board having to be temporarily removed from the working area of the machine.
  • the layout file for creating the via holes can be simply added to the geometric data for drilling and / or milling to create the narrow side (s).
  • the electrically conductive material is attached by a deposition process on the narrow side, in particular by means of a galvanic process.
  • Electrodeposition processes can be used to produce layers of electrically conductive material on a narrow side which have high quality, high electrical conductivity and good adhesion to the printed circuit board material.
  • copper and / or gold is deposited and more preferably a layer is deposited with at least approximately constant thickness, which may be, for example, between 30 and 100 microns.
  • the narrow sides and the side walls delimiting the via holes are simultaneously coated with electrically conductive material in a common deposition process, since this does not require a separate deposition process for generating the antenna sections on the narrow sides.
  • electrically conductive material attached to the narrow sides and / or adjacent circuit board material is subsequently removed in regions, for example by a milling process.
  • unneeded electrically conductive material can be removed, e.g. electrically conductive material, which faces away from the antenna section, or reduce the weight and space requirement of the circuit board.
  • removal of printed circuit board material can reduce dielectric losses.
  • the narrow side may be created by forming a hole in the circuit board and removed after metallization of the narrow side circuit board material extending between the hole and an outside of the circuit board such that the narrow side itself becomes the outside of the circuit board.
  • the outer contour of the printed circuit board is reduced by cutting until the narrow side becomes the outer side of the printed circuit board. This cutting of the printed circuit board towards the narrow side reduces the space requirement of the printed circuit board and the occurring dielectric losses. Since the narrow-side antenna section extends at least partially along the outer contour of the printed circuit board, a maximum antenna length or a maximum antenna diameter is also achieved for a given size.
  • Fig. 1 to 6 show an antenna arrangement according to the invention in different stages of their production.
  • Fig. 1a shows a plan view of the top of a circuit board 10, which comprises an upper and a lower side, on each of which a copper layer 14 has been applied.
  • Fig. 1a shows holes 12 for through-connections 22 (vias) between circuit parts on the upper side and circuit parts on the underside of the printed circuit board 10.
  • the via holes 12 can be produced, for example, by a drilling or milling process.
  • Side walls 11 of the printed circuit board 10 delimit the via holes 12.
  • Fig. 1b shows the circuit board 10 of Fig. 1a in a cross section along the line AA 'of Fig. 1a ,
  • the copper layers 14, 14 ' can be seen, which are respectively applied to the top side and the bottom side of the printed circuit board 10.
  • the thickness s of the copper layers 14, 14 'compared to the thickness d of the printed circuit board 10 is exaggerated.
  • the thickness d of the printed circuit board 10 may for example be about 1.5 mm and the thickness s of the copper layers 14, 14 'each about 50 microns.
  • Fig. 2a shows the circuit board 10 of Fig. 1 after slots 16 have been created in the circuit board 10.
  • the elongated holes 16 extend along desired antenna conductor tracks and are bounded in each case circumferentially by a narrow side 18 of the printed circuit board 10.
  • two elongated holes 16 run parallel to one another on opposite sides of an antenna conductor track, so that an elongate cantilevered web 19 of the printed circuit board is formed by two adjacent oblong holes 16 10 is limited, which can wear a top and bottom antenna section 24, 24 '.
  • the slots 16 are produced by a milling process.
  • the elongated holes 16 are milled perpendicular to the top and bottom of the circuit board 10, so that the elongated holes 16 defining narrow sides 18 and the top or bottom of the circuit board 10 form a substantially right angle.
  • the drilling process for the via holes 12 and the milling process for the elongated holes 16 can be performed in a common process step in the same machine.
  • the side walls 11 of the via holes 12 and the narrow sides 18 defined by the elongated holes 16 are coated by a deposition process with a conductive material, in the present embodiment with copper.
  • Fig. 3a shows a plan view of the arrangement of Fig. 2a after the deposition, which can be done in a conventional manner by galvanization in a galvanic bath.
  • the thickness of the deposited copper material may be several tens of microns, for example.
  • the deposited on the narrow sides 18 copper material forms on the one hand narrow-side antenna sections 20 and the other unwanted or unneeded copper material 20 ', namely in the areas of the slots 16 delimiting narrow sides 18 which are remote from the desired narrow-side antenna section 20.
  • the deposited in the via holes 12 copper forms the through-connections 22 (vias).
  • Fig. 3b shows that the cross-section of a free-carrying printed circuit board web 19 is surrounded by conductive material all round, namely the copper layers 14, 14 'and the narrow-side antenna sections 20.
  • the conductive material 14, 14', 20 surrounding the free-standing web 19 forms by its geometry an antenna current path with increased conductivity.
  • the copper layer 14 on the upper side and the copper layer 14 'on the underside of the printed circuit board 10 are patterned in a suitable manner, for example by an etching process known per se, on the upper side and the lower side of the printed circuit board 10 electrically conductive antenna sections 24, 24 'as well as electrical connection lines 28 and electrical pads 26 for in addition to the antenna on the circuit board 10 to produce circuit parts ( Fig. 4 ).
  • Fig. 4a, b, c show the printed circuit board 10 after patterning the copper layers 14, 14 '.
  • Fig. 4a shows, on the upper side of the circuit board 10, an approximately annular antenna portion 24 is formed, which extends in regions along the narrow sides 18 of the slots 16 and thereby with the on the narrow sides 18 deposited conductive material of the narrow-side antenna sections 20 is in electrical contact.
  • the two antenna sections 24, 24 'on the top and the bottom are as in Fig. 4b shown connected via the narrow-side antenna sections 20 with each other.
  • the antenna conductor tracks 24, 24 'on the upper and lower sides of the printed circuit board 10 together with the narrow-side antenna sections 20 form a substantially annular antenna which, in particular in the region of the cantilevered webs 19, increases the conductivity due to the conductive material deposited on the narrow sides 18 dielectric losses due to the formation of the elongated holes 16 in the dielectric material of the printed circuit board 10 has.
  • Fig. 4a a plurality of electrical connection surfaces 26 produced in the structuring step and electrical connection lines 28 are shown. These pads 26 and connecting lines 28 allow to attach electronic components for forming a driving circuit for driving the antenna on the printed circuit board 10.
  • the antenna is connected to the drive circuit via the connection surface 26a and via a connection surface 26b located on the back side of the circuit board 10, which serves as the reference potential for the circuit.
  • electronic components for example SMD components
  • SMD components can be used in a manner known per se attached to the pads 26 and interconnected via the electrical connection lines 28.
  • circuit parts on the upper side of the printed circuit board 10 are connected to one another by the interconnections 22 produced before the patterning process.
  • the assembly of the components for forming the drive circuit can be carried out before or after a trimming step following the structuring step or also between two sub-steps of the trimming step. The trimming step is explained below.
  • FIG. 5 schematically shows the cutting lines 30a, b, along which the circuit board 10 is cut.
  • the cutting line 30a the outer contour of the circuit board 10 is defined so that the cutting line 30a adjacent narrow-side antenna portions 20 of the outer slots 16 now form the outer sides of the circuit board 10 and portions of the antenna sections 24, 24 'on the top and bottom directly to the Outside of the circuit board 10 adjacent. Unnecessary electrically conductive material 20 'and unnecessary printed circuit board material is removed in this case.
  • the outer contour of the printed circuit board 10 can also be cut to size by allowing printed circuit board material extending between an outer slot 16 and an outer side of the printed circuit board 10 two cut out between the outside of the circuit board 10 and the slot 16 guided cuts.
  • the printed circuit board 10 can preferably be roughly cut to an outer contour, which is something before the structuring of the copper layers 14, 14 ' greater than its gage, so that thin webs of the circuit board 10 remain, extending between the outer slots 16 and the outside of the circuit board 10. These are then cut out in a further trimming step following the structuring.
  • Fig. 6a and b show the finished antenna assembly after cutting.
  • the electrical conductivity of the antenna is increased by the narrow-side antenna sections 20, and the dielectric losses are reduced by the removal of dielectric material.
  • outer narrow sides 18 of the printed circuit board 10 for narrow-side sections 20 of the antenna moreover, a maximum antenna diameter is achieved with a minimum space requirement of the antenna arrangement.

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  • Details Of Aerials (AREA)
EP09011000.8A 2009-08-27 2009-08-27 Agencement d'antennes Active EP2293381B1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP09011000.8A EP2293381B1 (fr) 2009-08-27 2009-08-27 Agencement d'antennes
US12/868,113 US20110050506A1 (en) 2009-08-27 2010-08-25 Antenna arrangement
CN201010267410.4A CN102005642B (zh) 2009-08-27 2010-08-27 天线装置

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP09011000.8A EP2293381B1 (fr) 2009-08-27 2009-08-27 Agencement d'antennes

Publications (2)

Publication Number Publication Date
EP2293381A1 true EP2293381A1 (fr) 2011-03-09
EP2293381B1 EP2293381B1 (fr) 2016-11-09

Family

ID=41130290

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09011000.8A Active EP2293381B1 (fr) 2009-08-27 2009-08-27 Agencement d'antennes

Country Status (3)

Country Link
US (1) US20110050506A1 (fr)
EP (1) EP2293381B1 (fr)
CN (1) CN102005642B (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102016108868A1 (de) * 2016-05-13 2017-11-16 Kathrein Werke Kg Adapterplatte für HF-Strukturen
FR3118836B1 (fr) * 2021-01-11 2024-03-29 Hager Controls Dispositif d’antenne sur circuit imprimé et procédé de réalisation d’antenne(s) sur circuit(s) imprimé(s)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19614362C1 (de) 1996-04-11 1997-07-31 Siemens Ag Antenne für ein Diebstahlschutzsystem eines Kraftfahrzeugs
EP1006572A1 (fr) * 1998-11-30 2000-06-07 Siemens Aktiengesellschaft Fentes en damasquin pour des lignes conductrices peu resistives pour circuits integrés
GB2357905A (en) 1999-12-01 2001-07-04 Hi Key Ltd Antenna formed on printed circuit board
WO2004034512A1 (fr) 2002-10-08 2004-04-22 Leopold Kostal Gmbh & Co. Kg Ensemble circuit electronique a antenne integree
US20040119643A1 (en) * 2002-12-19 2004-06-24 Accton Technology Corporation Planar inverted-f antenna and application system thereof
US20060238421A1 (en) 2001-06-01 2006-10-26 Agere Systems Inc. Low-loss substrate antenna structure and method of manufacture thereof
US20070279879A1 (en) 2006-05-30 2007-12-06 Shinko Electric Industries Co., Ltd. Wiring board and semiconductor apparatus

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE9704795D0 (sv) * 1997-12-19 1997-12-19 Allgon Ab Directional coupler for high power RF signals
TWI249978B (en) * 2004-05-11 2006-02-21 Via Tech Inc Circuit substrate and manufacturing method of plated through slot thereof
CN2881991Y (zh) * 2006-03-02 2007-03-21 汉达精密电子(昆山)有限公司 互补型调相pcb天线
KR100806847B1 (ko) * 2006-09-12 2008-02-22 삼성전자주식회사 마이크로 안테나 및 그 제조방법
US8983618B2 (en) * 2008-10-31 2015-03-17 Medtronic, Inc. Co-fired multi-layer antenna for implantable medical devices and method for forming the same

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19614362C1 (de) 1996-04-11 1997-07-31 Siemens Ag Antenne für ein Diebstahlschutzsystem eines Kraftfahrzeugs
EP1006572A1 (fr) * 1998-11-30 2000-06-07 Siemens Aktiengesellschaft Fentes en damasquin pour des lignes conductrices peu resistives pour circuits integrés
GB2357905A (en) 1999-12-01 2001-07-04 Hi Key Ltd Antenna formed on printed circuit board
US20060238421A1 (en) 2001-06-01 2006-10-26 Agere Systems Inc. Low-loss substrate antenna structure and method of manufacture thereof
WO2004034512A1 (fr) 2002-10-08 2004-04-22 Leopold Kostal Gmbh & Co. Kg Ensemble circuit electronique a antenne integree
US20040119643A1 (en) * 2002-12-19 2004-06-24 Accton Technology Corporation Planar inverted-f antenna and application system thereof
US20070279879A1 (en) 2006-05-30 2007-12-06 Shinko Electric Industries Co., Ltd. Wiring board and semiconductor apparatus

Also Published As

Publication number Publication date
EP2293381B1 (fr) 2016-11-09
CN102005642A (zh) 2011-04-06
CN102005642B (zh) 2016-05-18
US20110050506A1 (en) 2011-03-03

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