EP2514031A2 - Notch antenna - Google Patents
Notch antennaInfo
- Publication number
- EP2514031A2 EP2514031A2 EP10805726A EP10805726A EP2514031A2 EP 2514031 A2 EP2514031 A2 EP 2514031A2 EP 10805726 A EP10805726 A EP 10805726A EP 10805726 A EP10805726 A EP 10805726A EP 2514031 A2 EP2514031 A2 EP 2514031A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- notch
- antenna
- plate
- adjustment portion
- notch antenna
- 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
- 238000000034 method Methods 0.000 claims abstract description 27
- 238000009434 installation Methods 0.000 claims abstract description 12
- 238000004519 manufacturing process Methods 0.000 claims abstract description 7
- 239000000853 adhesive Substances 0.000 claims description 13
- 230000001070 adhesive effect Effects 0.000 claims description 13
- 230000008859 change Effects 0.000 claims description 10
- 239000002184 metal Substances 0.000 claims description 7
- 229910052751 metal Inorganic materials 0.000 claims description 7
- 230000004044 response Effects 0.000 claims description 6
- 239000004065 semiconductor Substances 0.000 claims description 6
- 239000004020 conductor Substances 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 4
- 239000007769 metal material Substances 0.000 claims description 3
- 230000008878 coupling Effects 0.000 claims description 2
- 238000010168 coupling process Methods 0.000 claims description 2
- 238000005859 coupling reaction Methods 0.000 claims description 2
- 230000005855 radiation Effects 0.000 description 4
- 238000010276 construction Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
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
- H01Q1/27—Adaptation for use in or on movable bodies
- H01Q1/32—Adaptation for use in or on road or rail vehicles
- H01Q1/325—Adaptation for use in or on road or rail vehicles characterised by the location of the antenna on the vehicle
- H01Q1/3283—Adaptation for use in or on road or rail vehicles characterised by the location of the antenna on the vehicle side-mounted antennas, e.g. bumper-mounted, door-mounted
-
- 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
- H01Q13/08—Radiating ends of two-conductor microwave transmission lines, e.g. of coaxial lines, of microstrip lines
- H01Q13/085—Slot-line radiating ends
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q21/00—Antenna arrays or systems
- H01Q21/30—Combinations of separate antenna units operating in different wavebands and connected to a common feeder system
-
- 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
- H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
- H01Q9/04—Resonant antennas
- H01Q9/0407—Substantially flat resonant element parallel to ground plane, e.g. patch antenna
- H01Q9/045—Substantially flat resonant element parallel to ground plane, e.g. patch antenna with particular feeding means
- H01Q9/0457—Substantially flat resonant element parallel to ground plane, e.g. patch antenna with particular feeding means electromagnetically coupled to the feed line
Definitions
- the invention described herein relates to notch antennas, to plate components of notch antennas, and to related manufacturing and installation methods.
- a conventional notch antenna is shown in Figure 1.
- the antenna comprises a plate P with a notch N, the notch N being coupled to feed line F at a feed point.
- the width W of the plate P is chosen to be less than a quarter of one wavelength.
- the notch N is doglegged to allow the notch to be of sufficient length.
- the invention described herein provides a notch antenna comprising a first notch coupled to a feed line, and a second notch in use passively excited by a signal supplied to the first notch through the feed line.
- the invention described herein provides a plate component of a notch antenna, the plate comprising a first notch for coupling to a feed line and a second notch arranged to be passively excited by a signal supplied to the first notch.
- the notch antenna comprises a plate in which the first and second notches are defined.
- the second notch is arranged with the first to be excited, in use, by currents induced around the first notch.
- the first notch comprises an open end at an edge of the plate, a closed end, and long edges between the open and closed ends.
- the second notch comprises an open end at an edge of the plate, a closed end, and long edges between the open and closed ends.
- the plate comprises a metallic material.
- the plate comprises a thin, electrically conducting material.
- the plate comprises an elastically deformable material.
- the plate comprises a flexible material.
- the antenna further comprises a cover arranged over one or both faces of the plate.
- the cover is electrically non-conductive.
- the cover is of low electrical permittivity to radio frequency energy within the operating range of the antenna.
- the cover comprises part of a vehicle registration plate.
- the plate comprises a component selected from a group including: the ground plane of a circuit-board, metal sheet and expanded metal.
- the plate has a width, x, dimension, a height, z, dimension and a depth, y, dimension.
- the depth of the plate is small in comparison to the width and height.
- the plate is generally rectangular.
- the width of the plate is equal to or greater than one quarter of one wavelength at the centre of the operating frequency range.
- the width of the plate is selected according to the desired frequency for the centre of the operating range.
- the first and second notches open on different plate edges.
- the first and second notches open on opposite plate edges.
- the first notch is generally linear.
- the second notch is generally linear.
- the first notch comprises long edges aligned with the width dimension of the plate.
- the second notch comprises long edges aligned with the width dimension of the plate.
- the first notch is of length less than or equal to one fifth of one wavelength at the centre of the operating frequency range.
- the second notch is of length less than one fifth of one wavelength at the centre of the operating frequency range.
- the length of the first and/or second notch is selected with a length according to the desired frequency for the centre of the operating range.
- the notch antenna comprises an adjustment portion provided to the second notch to facilitate change to the effective length of the second notch.
- the adjustment portion comprises a conductive patch applied to the second notch, suitably applied across the second notch.
- the adjustment portion is applied at the closed end of the second notch.
- the adjustment portion comprises a piece of adhesive backed tape, preferably adhesive backed metallic tape.
- the adjustment portion is arranged to bridge the second notch with a conducing element in contact with the plate.
- the adjustment portion is arranged to provide a conductor that is capacitively coupled to the plate.
- the adjustment portion comprises an semiconductor component coupled across the second notch.
- the adjustment portion comprises a switching component coupled across the second notch.
- the adjustment portion comprises a PIN diode coupled across the second notch.
- the adjustment portion comprises a plurality of like or unlike components, including one or more selected from the adjustment portions described above.
- the feed line comprises a coaxial feed line.
- the feed line comprises a micro- strip connection across the first notch.
- the antenna comprises a sealed body provided around the plate.
- the sealed body is an insulating body.
- the adjustment portion is provided outside the sealed body.
- the first and second notches are manufactured with different lengths.
- the second notch is longer than the first notch.
- the adjustment portion shortens the effective length of the second notch.
- the invention described herein provides a method of manufacturing a notch antenna comprising the steps of: providing a first notch coupled to a feed line, and providing a second notch in use to be passively excited by a signal supplied to the first notch through the feed line.
- the method further comprises providing an adjustment portion for the second notch to change the effective length of the second notch.
- the method further comprises providing an adjustment portion in the form of a conductive patch applied to the second notch, suitably applied across the second notch.
- the adjustment portion is applied at the closed end of the second notch.
- the adjustment portion comprises a piece of adhesive backed tape, preferably adhesive backed metallic tape.
- the method further comprises providing an adjustment portion in the form of a semiconductor component coupled across the second notch.
- the adjustment portion comprises a switching component coupled across the second notch.
- the adjustment portion comprises a PIN diode coupled across the second notch.
- the adjustment portion comprises a plurality of like or unlike components, including one or more selected from the adjustment portions described above.
- the invention described herein provides a notch antenna installation method, the method comprising providing a notch antenna comprising a first notch coupled to a feed line, and a second notch in use passively excited by a signal supplied to the first notch through the feed line, installing the antenna at a desired installation position, and providing an adjustment portion for the second notch to change the effective length of the second notch in response to a detected frequency shift from a desired centre frequency caused by electrical permittivity of the installation position.
- providing the adjustment portion comprises providing a conductive patch applied to the second notch, suitably applied across the second notch.
- the adjustment portion is applied at the closed end of the second notch.
- the adjustment portion comprises a piece of adhesive backed tape, preferably adhesive backed metallic tape.
- Figure 1 shows a schematic front view of a conventional notch antenna
- Figure 2 shows a schematic front view of a notch antenna according to an example embodiment of the invention described herein;
- Figure 3 shows a schematic front view of a plate for a notch antenna according to an example embodiment of the invention described herein;
- Figure 4 shows the voltage standing wave ratio (VSWR) of a notch antenna according to an example embodiment of the invention described herein, constructed with the plate of Figure 3; and Figures 5 and 6 show radiation patterns of a notch antenna according to an example embodiment of the invention described herein, constructed with the plate of Figure 3.
- VSWR voltage standing wave ratio
- FIG. 2 there is shown a schematic front view of a notch antenna 10 according to an example embodiment of the invention described herein.
- the antenna 10 comprises a plate 20, first and second notches 21 ,22 and a feed line 30.
- the feed line 30 may be fed directly, or alternatively via a BALUN.
- the first notch 21 is operatively coupled to the feed line 30 at a feed point to receive a signal from the feed line 30 when the antenna 10 is used to transmit. Reciprocity applies when the antenna 10 is used to receive.
- the second notch 22 is in use passively excited by a signal supplied to the first notch 21 through the feed line 30, or by induced currents in the plate for the receive condition.
- the feed line 30 is suitably a coaxial line.
- the plate 20 is generally planar, and generally rectangular with characteristic dimensions of width x, height z, and out of plane depth y, that is an out of plane depth y that is orthogonal to the plane of the paper. The depth of the plate 20 is small in comparison to the width and height.
- the first and second notches 21 ,22 are provided in the plate 20 close to one another such that the second notch 22 is excited, in use, by currents induced around the first notch 21 in response to a signal applied to the first notch 21 from the feed line 30, or by induced plate currents in the case or reception.
- the first notch 21 comprises an open end 211 at an edge of the plate, a closed end 212, and long edges 213 between the open and closed ends 21 1 ,212.
- the second notch 22 comprises an open end 221 at an edge of the plate, a closed end 222, and long edges 223 between the open and closed ends 221 ,222.
- the long edges 213,223 are linear, and are aligned with the width of the plate 20.
- the open ends 21 1 ,221 of the first and second notches 21 ,22 are located on opposing plate edges. In preferred embodiments the width of the plate 20 is greater than one quarter of one wavelength at the centre of the operating frequency range.
- the plate 20 comprises a metallic material which in example embodiments may be flexible to allow the antenna 10 to be bent out of planar arrangement around a substrate to which it is to be installed.
- the plate 20 is arranged with a non-conductive cover arranged over one or both faces of the plate, and for example may be integrated with a cover in the guise of a vehicle registration plate.
- Flexible plates may for example comprise an electrically conductive metallic mesh, for example expanded metal.
- Rigid plates may for example comprise a circuit board with its ground plane, or metal sheet. Copper is a particularly suited metal for any of these plate constructions owing to its excellent electrical conduction properties.
- the antenna produced is conveniently sized and shaped to enable it to be hermetically sealed, thereby reducing the risk of degradation in performance over time due to corrosion or other environmental effects.
- the relatively simple construction and convenient dimensions enable a relatively robust antenna package to be produced, with the antenna being easily mountable and concealable in a range of applications.
- the area around the closed end 222 of the second notch 22 comprises an adjustment portion provided to facilitate change to the effective length of the second notch 22.
- the second notch 22 is relatively longer than required. If required, a conductive patch can be applied across the second notch 22 at the closed end 222 thereof, effectively reducing the length of the second notch 22.
- the change in length of the second notch 22 enables frequency response of the antenna to be easily adjusted to suit its environment. For example, shift in the centre frequency of the desired operating frequency range caused by permittivity of the structure on which the antenna 10 is mounted, or that of nearby metallic structures, can now be compensated for.
- the two linear notches provide a circular polar response with high efficiency over a significant bandwidth range.
- a high efficiency is achievable over more than a 10% of the bandwidth.
- the centre frequency of the antenna can be altered by simply adjusting the length of the unfed second notch 22 there is no need to reposition the feed line when installing and tuning the antenna.
- the manufacturing method comprises the steps of providing a first notch coupled to a feed line, and providing a second notch in use to be passively excited by a signal supplied to the first notch through the feed line, in the case of transmission.
- the notch antenna manufacturing method suitably further comprises providing an adjustment portion for the second notch. The adjustment portion is provided along the second notch to enable a change in the effective electrical length of the second notch.
- the installation method comprises the steps of providing a notch antenna comprising a first notch coupled to a feed line, and a second notch, in use to be passively excited by a signal supplied to the first notch through the feed line, installing the antenna at a desired installation position, and providing an adjustment portion for the second notch to change the effective length of the second notch in response to a detected frequency shift from a desired centre frequency caused by the local environmental effects about the installation position.
- the step of providing the adjustment portion comprises providing a piece of adhesive backed metallic tape at the closed end of the second notch.
- the step of providing the adjustment portion comprises providing a suitable electronically activated semiconductor device or devices to bridge the second notch at an appropriate position, for example providing one or more PIN diode switches.
- Figure 3 shows a schematic front view of a plate 20 for a tuneable notch antenna according to an example embodiment of the invention described herein.
- the plate 20 is intended for an antenna designed to operate at a lowest frequency of 405 MHz in free space.
- example embodiments of the invention described herein are operable over frequencies in the lower UHF band, up to and including the S-Band, for example in the range 0.2GHz to 4GHz.
- Figure 4 shows the VSWR of an antenna constructed from the plate of Figure 3
- Figures 5 and 6 show the radiation characteristics of the antenna.
- Figure 5 shows the pattern in the yz plane
- Figure 6 shows the pattern in the xy plane.
- Figures 5 and 6 show radiation patterns similar to those produced by a dipole aligned on the z axis, with the antenna providing a complete 360 degree azimuth radiation pattern.
Abstract
Description
Claims
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GBGB0921811.6A GB0921811D0 (en) | 2009-12-14 | 2009-12-14 | Notch antenna |
GBGB1008784.9A GB201008784D0 (en) | 2009-12-14 | 2010-05-26 | Notch antenna |
GB1009752A GB2476132A (en) | 2009-12-14 | 2010-06-11 | Fed and parasitic notch antenna arrangement |
PCT/GB2010/052079 WO2011073645A2 (en) | 2009-12-14 | 2010-12-14 | Notch antenna |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2514031A2 true EP2514031A2 (en) | 2012-10-24 |
EP2514031B1 EP2514031B1 (en) | 2018-12-05 |
Family
ID=41667051
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP10805726.6A Active EP2514031B1 (en) | 2009-12-14 | 2010-12-14 | Notch antenna |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP2514031B1 (en) |
GB (3) | GB0921811D0 (en) |
WO (1) | WO2011073645A2 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN108604731A (en) * | 2016-01-28 | 2018-09-28 | 索尼移动通讯有限公司 | Antenna structure on circuit board |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN106537690A (en) * | 2015-08-31 | 2017-03-22 | 华为技术有限公司 | Slot antenna and terminal device |
US10218077B2 (en) * | 2016-08-04 | 2019-02-26 | Te Connectivity Corporation | Wireless communication device having a multi-band slot antenna with a parasitic element |
CN113823899B (en) | 2017-12-28 | 2023-02-03 | 华为技术有限公司 | Multi-frequency antenna and mobile terminal |
Family Cites Families (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2600179A (en) * | 1946-02-18 | 1952-06-10 | Alford Andrew | Split cylinder antenna |
JPH07249926A (en) * | 1994-03-09 | 1995-09-26 | Matsushita Electric Works Ltd | Plane antenna |
US5754143A (en) * | 1996-10-29 | 1998-05-19 | Southwest Research Institute | Switch-tuned meandered-slot antenna |
US5917454A (en) * | 1997-08-22 | 1999-06-29 | Trimble Navigation Limited | Slotted ring shaped antenna |
GB9910246D0 (en) * | 1999-05-05 | 1999-06-30 | Asg Technology Limited | Concealed radio atenna system |
US6320544B1 (en) * | 2000-04-06 | 2001-11-20 | Lucent Technologies Inc. | Method of producing desired beam widths for antennas and antenna arrays in single or dual polarization |
TW535329B (en) * | 2001-05-17 | 2003-06-01 | Acer Neweb Corp | Dual-band slot antenna |
JP3844717B2 (en) * | 2002-07-19 | 2006-11-15 | ソニー・エリクソン・モバイルコミュニケーションズ株式会社 | Antenna device and portable radio communication terminal |
TWI256749B (en) * | 2004-04-30 | 2006-06-11 | Hon Hai Prec Ind Co Ltd | Multi-band antenna |
WO2006097496A1 (en) * | 2005-03-15 | 2006-09-21 | Fractus, S.A. | Slotted ground-plane used as a slot antenna or used for a pifa antenna |
TWI313082B (en) * | 2005-08-16 | 2009-08-01 | Wistron Neweb Corp | Notebook and antenna thereof |
WO2008026587A1 (en) * | 2006-09-01 | 2008-03-06 | Fujikura Ltd. | Antenna and electronic device |
JP4904197B2 (en) * | 2007-05-08 | 2012-03-28 | パナソニック株式会社 | Unbalanced feed broadband slot antenna |
TWM347695U (en) * | 2008-01-31 | 2008-12-21 | Wistron Neweb Corp | Antenna |
-
2009
- 2009-12-14 GB GBGB0921811.6A patent/GB0921811D0/en not_active Ceased
-
2010
- 2010-05-26 GB GBGB1008784.9A patent/GB201008784D0/en not_active Ceased
- 2010-06-11 GB GB1009752A patent/GB2476132A/en not_active Withdrawn
- 2010-12-14 EP EP10805726.6A patent/EP2514031B1/en active Active
- 2010-12-14 WO PCT/GB2010/052079 patent/WO2011073645A2/en active Application Filing
Non-Patent Citations (1)
Title |
---|
See references of WO2011073645A2 * |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN108604731A (en) * | 2016-01-28 | 2018-09-28 | 索尼移动通讯有限公司 | Antenna structure on circuit board |
Also Published As
Publication number | Publication date |
---|---|
WO2011073645A3 (en) | 2011-08-18 |
WO2011073645A2 (en) | 2011-06-23 |
EP2514031B1 (en) | 2018-12-05 |
GB201008784D0 (en) | 2010-07-14 |
GB2476132A (en) | 2011-06-15 |
GB201009752D0 (en) | 2010-07-21 |
GB0921811D0 (en) | 2010-01-27 |
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