EP4189774A1 - Multiband loop antenna - Google Patents
Multiband loop antennaInfo
- Publication number
- EP4189774A1 EP4189774A1 EP21743140.2A EP21743140A EP4189774A1 EP 4189774 A1 EP4189774 A1 EP 4189774A1 EP 21743140 A EP21743140 A EP 21743140A EP 4189774 A1 EP4189774 A1 EP 4189774A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- partial structure
- leg
- loop antenna
- antenna
- band loop
- 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.)
- Pending
Links
- 230000008878 coupling Effects 0.000 claims abstract description 28
- 238000010168 coupling process Methods 0.000 claims abstract description 28
- 238000005859 coupling reaction Methods 0.000 claims abstract description 28
- 230000007704 transition Effects 0.000 claims description 6
- 239000002184 metal Substances 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 230000003071 parasitic effect Effects 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 239000004020 conductor Substances 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- 239000003990 capacitor Substances 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/12—Supports; Mounting means
- H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
-
- 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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
- H01Q5/30—Arrangements for providing operation on different wavebands
- H01Q5/307—Individual or coupled radiating elements, each element being fed in an unspecified way
- H01Q5/314—Individual or coupled radiating elements, each element being fed in an unspecified way using frequency dependent circuits or components, e.g. trap circuits or capacitors
- H01Q5/321—Individual or coupled radiating elements, each element being fed in an unspecified way using frequency dependent circuits or components, e.g. trap circuits or capacitors within a radiating element or between connected radiating elements
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
- H01Q5/30—Arrangements for providing operation on different wavebands
- H01Q5/307—Individual or coupled radiating elements, each element being fed in an unspecified way
- H01Q5/342—Individual or coupled radiating elements, each element being fed in an unspecified way for different propagation modes
- H01Q5/357—Individual or coupled radiating elements, each element being fed in an unspecified way for different propagation modes using a single feed point
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
- H01Q5/30—Arrangements for providing operation on different wavebands
- H01Q5/378—Combination of fed elements with parasitic elements
-
- 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
- H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
- H01Q9/04—Resonant antennas
- H01Q9/30—Resonant antennas with feed to end of elongated active element, e.g. unipole
- H01Q9/42—Resonant antennas with feed to end of elongated active element, e.g. unipole with folded element, the folded parts being spaced apart a small fraction of the operating wavelength
Definitions
- the invention relates to a loop antenna for sending or receiving radio signals, the loop antenna being implemented on a printed circuit board.
- An electronic device that is set up to communicate via a wireless communication network typically includes at least one antenna for receiving and/or transmitting radio signals.
- the electronic device can be set up to receive or transmit radio signals over a large number of different frequency bands, in particular over two different frequency bands or frequency ranges.
- the device can include a multi-band antenna, in particular a dual-band antenna.
- Exemplary dual-band antennas can be provided, for example, for the 2.4 - 2.5 GHz and 5.1 - 5.8 GHz frequency bands, i.e. for WLAN (Wireless Local Area Network).
- Antennas typically require a reference ground or reference plane for their function.
- the size and shape of such a reference ground typically have a significant influence on the function and radiation characteristics of an antenna.
- An antenna is often to be used as a printed circuit board structure or as an attached metal structure (e.g. as a stamped and bent part) in printed circuit boards of different sizes.
- the differently sized printed circuit boards represent different reference grounds for an antenna.
- plastic in the vicinity of the antenna e.g. due to a housing
- a new antenna tuning is typically required for each circuit board geometry and/or application. Such antenna tuning can be effected, for example, by changing the antenna structure.
- the present document deals with the technical task of providing a (multi-band or dual-band) antenna that can be integrated in an efficient manner (in particular without the need for dedicated antenna tuning) on printed circuit boards of different designs and/or in different environments.
- a multi-band antenna is to be provided which is insensitive to variations in the environment of the antenna.
- a multi-band loop antenna is described.
- the multi-band loop antenna described in this document can be implemented efficiently on printed circuit boards with different dimensions and/or in different environments or applications (in particular in different devices).
- a circuit board typically includes an electrically conductive first (outer) layer (e.g., a front layer) and an electrically conductive second (outer) layer (e.g., a bottom layer).
- the one or more layers may be electrically isolated from one another by one or more dielectric layers.
- the first and second layers can each comprise an electrically conductive material, in particular copper.
- the electrically conductive material can be removed from the respective layer at least in regions, in particular in order to form a free space or gap between an (electrically conductive) antenna structure and an (electrically conductive) reference area.
- the multi-band loop antenna includes a first, electrically conductive, L-shaped substructure on the first layer of the printed circuit board.
- the first substructure can have a first resonant frequency.
- the first partial structure can form a first L antenna for a first frequency range around the first resonant frequency.
- the first frequency range can include, in particular be, 2.4-2.5 GHz.
- the first partial structure has a feed point of the antenna, via which an RF (radio frequency) signal to be transmitted can be fed into the antenna and/or a received RF signal can be fed out of the antenna.
- RF radio frequency
- the multi-band loop antenna includes a second, electrically conductive, L-shaped partial structure on the first layer of the printed circuit board.
- the second partial structure can be designed for a second resonant frequency and thus for a second frequency range.
- the second substructure can have a second L-antenna for form the second frequency range around the second resonant frequency.
- the second frequency range can include, in particular be, 5.1-5.8 GHz.
- the first substructure and the second substructure are capacitively coupled to one another in a coupling region.
- the coupling area can be designed in such a way that an RF signal with a frequency from the second frequency range is transmitted via the coupling area (e.g. from the feed point to the second substructure or from the second substructure to the feed point).
- the multi-band loop antenna also includes an electrically conductive first reference area, which can be connected to a ground potential, for example.
- the area of the first reference area is typically significantly larger, in particular by a factor of 5 or more, or 10 or more, than the area of the two partial structures.
- the first partial structure and the second partial structure are arranged on the first layer of the printed circuit board in such a way that they form a loop or a loop or a frame together with the first reference area.
- a loop antenna can thus be provided from a number of substructures for different frequency ranges in each case. In this way, a multi-band loop antenna can be provided which is insensitive to changes in the environment around the antenna and can therefore be installed in different devices in a flexible manner.
- the second partial structure can be electrically conductively connected to the first reference region and, in particular, can be embodied as a parasitic element of the multiband loop antenna.
- an electrically insulating gap or free space can be arranged between the first partial structure and the first reference region.
- the feed point can then be arranged at the end of the first partial structure facing the gap or free space.
- a multiband loop antenna can thus be provided in a particularly efficient and compact manner. In particular, it can thus be made possible to transmit the RF signals for a number of different frequency bands, in particular for the first and the second frequency band, via a single feed point.
- the first substructure may have a first leg and a second leg that together form the L-shape. The first leg can be shorter than the second leg. The first leg of the first partial structure can extend, in particular perpendicularly, away from the first reference area.
- the second partial structure can have a first leg and a second leg, which together form an L-shape.
- the first leg can be shorter than the second leg.
- the first leg of the second partial structure can extend, in particular perpendicularly, away from the first reference area.
- the second limb of the first partial structure can extend towards the second partial structure, in particular perpendicular to the first limb of the first partial structure.
- the second limb of the second partial structure can extend onto the first partial structure, in particular perpendicular to the first limb of the second partial structure.
- the second legs of the two partial structures can run parallel to one another.
- the first L-shaped partial structure and the second L-shaped partial structure can thus be arranged relative to one another in such a way that together they have a U-shape.
- a multiband loop antenna can thus be provided in a particularly efficient and compact manner.
- the second leg of the first partial structure can adjoin the second leg of the second partial structure in the coupling region. Furthermore, the second leg of the first partial structure and the second leg of the second partial structure can run parallel to one another, in particular in the coupling region. Furthermore, part of the second leg of the first partial structure and part of the second leg of the second partial structure can run directly next to one another in the coupling region and be spaced apart from one another by an electrically insulating coupling gap.
- the part of the second leg of the first partial structure and the part of the second leg of the second partial structure, which run directly next to each other in the coupling area each correspond to less than 50%, in particular less than 30%, of the length of the leg of the respective second leg, and/or respectively more than 10% of the leg length of the respective second leg.
- a particularly reliable capacitive coupling can thus be formed between the partial structures.
- Parts of the second legs of the two substructures can thus together form a capacitor for capacitive coupling of the two substructures in order to provide a multi-band loop antenna in an efficient and compact manner.
- the first leg of the first substructure and the first leg of the second substructure can each run towards a specific edge of the printed circuit board.
- the antenna can be designed in such a way that the second leg of the first partial structure is arranged closer to the edge of the printed circuit board in the coupling region than the second leg of the second partial structure.
- a part of the second leg of the second partial structure can be shielded from the edge of the printed circuit board by a part of the second leg of the first partial structure.
- the second partial structure can thus be arranged at a relatively large distance from the edge of the printed circuit board. In this way, the sensitivity of the antenna can be further reduced, in particular when the second partial structure is designed for a (second) frequency range with higher frequencies than the first partial structure.
- the first and/or the second partial structure can have an increased width compared to the width of the limbs in a transition area between the limbs of the respective partial structure (in particular at the point at which the two limbs are connected to one another).
- the bandwidth of the frequency range of the respective substructure can be increased by increasing the width of a substructure in the transition region.
- the legs of the first substructure can have an overall length that depends on the first resonant frequency.
- the first partial structure can be designed as a 1/4 radiator in relation to the first resonant frequency.
- the legs of the second partial structure can have an overall length that depends on the second resonant frequency.
- the (to be effected) second resonant frequency of the total length of the legs of the second partial structure and of depend on at least one property, in particular the capacitance, of the coupling region between the first partial structure and the second partial structure.
- the different frequency ranges of the multi-band loop antenna can thus be defined in a precise manner by the overall length of the legs and/or by the design of the coupling area.
- the multi-band loop antenna can include an electrically conductive second layer of the printed circuit board.
- the multi-band loop antenna may include an electrically conductive second reference region on the second layer (wherein the second reference region may be at ground potential).
- the second reference area and the first reference area can be arranged at least partially or completely overlapping each other.
- the second reference region on the second layer may be electrically conductively connected to the first reference region on the first layer via one or more vias (i.e., vias).
- an electrical device in particular a household appliance or household appliance, which includes a communication unit for wireless communication (in particular via WLAN), the communication unit having the multi-band loop antenna described in this document.
- FIG. 1a shows the top or the first outer layer of a printed circuit board with an antenna
- FIG. 1b shows the bottom layer or the second outer layer of a printed circuit board
- FIG. 1c shows a cross section through a printed circuit board with an antenna.
- the present document deals with the provision of a (dual-band) antenna which can be integrated in an efficient manner on printed circuit boards with different dimensions and/or layouts and/or in different environments.
- the (dual band) antenna should be designed in particular for WLAN (Wireless Local Area Network) radio communication in the frequency bands at 2.4 GHz and at 5 GHz.
- FIGS. 1a and 1b show an exemplary antenna 100 which is integrated on a printed circuit board 150.
- FIG. 1a shows the (electrically conductive) upper layer 151 of the circuit board 150
- FIG. 1b shows the (electrically conductive) lower layer 152 of the circuit board.
- FIG. 1c between the upper (ie the first) layer 151 and the lower (ie the second) layer 152 there are one or more dielectric layers 130 and optionally one or more (electrically conductive) intermediate layers (not shown) .
- the electrically conductive layers 151, 152 can have a layer made of metal, in particular copper. The metal may be removed (e.g., etched away) in portions of the layers 151, 152 to form distinct electrically conductive portions within a layer 151, 152, which portions are typically electrically isolated from one another.
- the upper layer 151 has an electrically conductive antenna structure that forms a magnetic antenna or a loop antenna.
- the antenna structure has a first (L-shaped) partial structure 110, which is designed as an antenna for a first frequency or for a first frequency range (approximately 2.4-2.5 GHz).
- the limbs 111, 112 of the first L-shaped partial structure 110 together can have a specific overall length in order to form a 1/4 radiator for the first frequency range.
- the antenna structure also has a second (L-shaped) partial structure 120, which is designed as an antenna for a second frequency or for a second frequency range (approximately 5.1-5.8 GHz).
- the legs 121, 122 of the second L-shaped partial structure 120 together have a certain overall length to a to form 1/4 radiators for the second frequency range (possibly in combination with a property, in particular the capacity, of the coupling region 108 between the two partial structures 110, 120).
- the two L-shaped partial structures 110, 120 are arranged on the upper layer 151 of the printed circuit board 150 in such a way that the partial structures 110, 120 form a loop 109 together with a reference area 105 on the upper layer 151.
- the first leg 111 of the first partial structure 110 can extend away from the reference area 105 .
- the second leg 112 of the first partial structure 110 can then run perpendicular to the first leg 111 of the first partial structure 110 (and thus parallel to the reference area 105).
- the first leg 121 of the second partial structure 120 can extend away from the reference area 105 .
- the second leg 122 of the second partial structure 120 can then run perpendicular to the first leg 121 of the second partial structure 120 (and thus parallel to the reference area 105).
- the second legs 112, 122 of the two partial structures 110, 120 can run parallel to one another in the coupling region 108, with a coupling gap 102 being located between the second legs 112, 122 of the two partial structures 110, 120.
- the gap width of the gap 102 and/or the length 103 of the overlap of the second legs 112, 122 of the two substructures 110, 120 can be selected in order to achieve an optimized compromise between the strongest possible capacitive coupling of the two substructures 110, 120 on the one hand and the strongest possible Provide selectivity and / or delimitation of the two frequency ranges on the other hand.
- the gap width and/or the length 103 of the gap 102 can be selected or specified for setting the second resonant frequency for the second frequency range.
- the first leg 121 of the second partial structure 120 can be electrically conductively connected to the reference region 105 .
- an electrically non-conductive gap 104 is arranged between the first leg 111 of the first partial structure 110 and the reference region 105 .
- a signal to be sent can be fed in or a signal fed out received signal. In other words, that point of the first leg
- the 111 of the first partial structure 110 can form the feed point 107 of the antenna 100 .
- the frequency selectivity of the respective frequency range can be adjusted or adjusted.
- the bandwidth of a frequency range can typically be reduced by reducing the leg width 106, while the bandwidth of the frequency range can be increased by increasing the leg width 106.
- a (compared to the leg width 106) broadened (electrically conductive) transition region 113 may be arranged.
- the bandwidth of the frequency domain can be increased.
- the antenna 100 can have a reference area 155 on the lower layer 152 of the printed circuit board 150 , in particular for shielding purposes, which can be arranged directly opposite the reference area 105 of the upper layer 151 .
- the two reference regions 105, 155 can be connected to one another in an electrically conductive manner via electrically conductive vias or plated-through holes 131.
- An antenna 100 which has L antennas as partial structures 110, 120.
- An L-antenna is an antenna in the shape of the letter "L".
- the capacitive coupling between the two L antennas 110, 120 in the coupling area 108 makes it possible to set the second resonant frequency of the antenna 100 (for the second frequency range).
- the position of the parasitic element i.e. the second partial area or the second L antenna 120
- the ground plane i.e. to the reference area
- the position of the parasitic element can be chosen such that the parasitic element is as far away from the edge 153 of the circuit board 150 as possible. In this way it can be achieved that changes in the area around the antenna 100 (eg installation of the antenna 100 in a device with or without a plastic housing) the
- first L-antenna 110 for the lower (first) frequency range can be made wider in the bend of the “L” in order to ensure a larger bandwidth in the first frequency range.
- the antenna 100 described in this document can intercept possible fluctuations in the environment of the antenna 100 (with or without plastic) and the input impedance of the antenna 100 can be made almost independent of the environmental conditions of the antenna 100 . Furthermore, the antenna 100 described requires relatively little space.
Landscapes
- Details Of Aerials (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102020209545.0A DE102020209545A1 (en) | 2020-07-29 | 2020-07-29 | Multiband loop antenna |
PCT/EP2021/068996 WO2022022976A1 (en) | 2020-07-29 | 2021-07-08 | Multiband loop antenna |
Publications (1)
Publication Number | Publication Date |
---|---|
EP4189774A1 true EP4189774A1 (en) | 2023-06-07 |
Family
ID=76971886
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP21743140.2A Pending EP4189774A1 (en) | 2020-07-29 | 2021-07-08 | Multiband loop antenna |
Country Status (5)
Country | Link |
---|---|
US (1) | US20230246333A1 (en) |
EP (1) | EP4189774A1 (en) |
CN (1) | CN115917877A (en) |
DE (1) | DE102020209545A1 (en) |
WO (1) | WO2022022976A1 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
TWI779934B (en) * | 2021-11-24 | 2022-10-01 | 宏碁股份有限公司 | Mobile device for reducing sar |
DE102023201834A1 (en) | 2023-02-28 | 2024-08-29 | BSH Hausgeräte GmbH | Multiband loop antenna with extended bandwidth |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7339531B2 (en) * | 2001-06-26 | 2008-03-04 | Ethertronics, Inc. | Multi frequency magnetic dipole antenna structures and method of reusing the volume of an antenna |
US6943730B2 (en) * | 2002-04-25 | 2005-09-13 | Ethertronics Inc. | Low-profile, multi-frequency, multi-band, capacitively loaded magnetic dipole antenna |
BR0215864A (en) | 2002-09-10 | 2005-07-05 | Fractus Sa | Antenna device and handheld antenna |
US7084813B2 (en) * | 2002-12-17 | 2006-08-01 | Ethertronics, Inc. | Antennas with reduced space and improved performance |
KR100787229B1 (en) * | 2005-02-04 | 2007-12-21 | 삼성전자주식회사 | Printed inverted F antenna for dual band operation |
WO2008059509A2 (en) * | 2006-11-16 | 2008-05-22 | Galtronics Ltd | Compact antenna |
TWI403025B (en) * | 2007-12-05 | 2013-07-21 | Yageo Corp | Integrated antenna for worldwide interoperability for microwave access (wimax) and wlan |
US9407003B1 (en) | 2014-05-27 | 2016-08-02 | Amazon Technologies, Inc. | Low specific absorption rate (SAR) antenna structure |
DE102015215987A1 (en) * | 2015-08-21 | 2017-02-23 | BSH Hausgeräte GmbH | Dual band antenna |
TWI686996B (en) * | 2018-09-19 | 2020-03-01 | 啓碁科技股份有限公司 | Antenna structure |
-
2020
- 2020-07-29 DE DE102020209545.0A patent/DE102020209545A1/en active Pending
-
2021
- 2021-07-08 CN CN202180049953.5A patent/CN115917877A/en active Pending
- 2021-07-08 EP EP21743140.2A patent/EP4189774A1/en active Pending
- 2021-07-08 US US18/011,933 patent/US20230246333A1/en active Pending
- 2021-07-08 WO PCT/EP2021/068996 patent/WO2022022976A1/en active Application Filing
Also Published As
Publication number | Publication date |
---|---|
US20230246333A1 (en) | 2023-08-03 |
CN115917877A (en) | 2023-04-04 |
DE102020209545A1 (en) | 2022-02-03 |
WO2022022976A1 (en) | 2022-02-03 |
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