WO2004010529A1 - Integrated loop antenna for vehicular applications - Google Patents
Integrated loop antenna for vehicular applications Download PDFInfo
- Publication number
- WO2004010529A1 WO2004010529A1 PCT/GB2003/003260 GB0303260W WO2004010529A1 WO 2004010529 A1 WO2004010529 A1 WO 2004010529A1 GB 0303260 W GB0303260 W GB 0303260W WO 2004010529 A1 WO2004010529 A1 WO 2004010529A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- dielectric
- antenna
- vehicle
- loop
- segment
- Prior art date
Links
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
- H01Q1/1271—Supports; Mounting means for mounting on windscreens
-
- 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
- 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
- H01Q9/40—Element having extended radiating surface
Definitions
- the present invention relates to a vehicular antenna system and, more particularly, to a system that includes a configuration for a loop antenna which enhances reception performance.
- Antennas integrated into parts of a vehicle are known.
- One approach is to use the de-misting heater grid on the rear screen as part of the antenna; see Japanese Patent Application No. 13/22005.
- Such an arrangement may be used with a separate element for AM reception; see EP Patent Application No. 0 155 647.
- Some vehicles provide a suitable dielectric surface onto which a dedicated antenna element pattern can be formed.
- a suitable dielectric surface onto which a dedicated antenna element pattern can be formed.
- One example is the rear quarter window on a station wagon (estate car) .
- Such windows are fixed, which allows the printing of a suitable antenna pattern.
- the use of separate patterns to provide FM and AM radio reception was proposed in US Patent 3,771, 159.
- Combining a pattern on a side window with elements on other windows to improve pattern coverage was proposed in EP Application No. 0 854 533.
- a major problem with implementation of an antenna element on a rear quarter window of a vehicle is polarisation. Often the signal feedline needs to connect to the bottom of the window because of space limitations at the top and sides of the window frame. This means that the primary antenna currents are extending vertically, and there then exists correspondingly less horizontal polarisation (“horizontal polarisation” here signifying the horizontally-polarized component of the antenna signal) . This causes problems for markets where broadcast signals are predominantly horizontally- polarised.
- the present invention is a loop-type screen antenna that at least in its preferred embodiments is intended to address the foregoing problems.
- a vehicular screen antenna of the invention is adapted to be fitted to a vehicle so as to extend generally vertically, and includes a conductor extending on a dielectric.
- the conductor is configured as a loop having entry and exit segments that extend proximate each other from the loop towards an edge of the dielectric and are oriented on the dielectric so as to extend generally vertically when the dielectric is fitted to a vehicle.
- a horizontally-polarized component of a linearly-polarized signal on the antenna has a magnitude at least approximating that of a vertically- polarized component of the signal.
- the entry and exit segments join the loop proximate each other and a corner of the loop .
- the first edge of the dielectric is a bottom edge.
- the entry and exit segments may join the loop proximate each other and a corner of the loop.
- the dielectric is a window of the vehicle .
- the entry segment may be adapted to connect to a feedline, and the exit segment adapted to connect to vehicle ground.
- the entry segment may be adapted to connect to a feedline, and the exit segment to connect to a stub segment that extends generally parallel to the first edge of the dielectric for capacitive coupling to vehicle ground.
- the stub segment may be adapted to be separated less than approximately 5mm from a vehicle ground surface proximate the first edge of the dielectric. The length of the stub segment and' its separation distance from the vehicle ground surface may be selected such that the stub segment is able to receive low-frequency broadcast signals (LW/M /SW) typically described as "AM" (below 6 MHz) .
- LW/M /SW low-frequency broadcast signals
- the entry segment may be adapted to connect to a feedline, and the exit segment to connect to one end' of resonator circuitry the other end of which connects to vehicle ground.
- the resonator circuitry may be formed by a discrete electronic circuit that includes an inductor means and a capacitor means connected in series.
- the resonator circuitry may also include a tuning means.
- the antenna includes a switch means for disconnecting the exit segment from a signal ground and connecting it instead to the entry segment.
- the loop may have a generally rectilinear configuration.
- the loop is generally configured as a rectangle having its longer sides extending generally horizontally when the dielectric is fitted to the vehicle. More preferably, when the dielectric is fitted to the vehicle, the loop is extends at between approximately 50mm and approximately 100mm from the edges of the dielectric.
- the loop may be positioned generally centrally on the dielectric.
- the dielectric is a rear window or a rear quarter window of a station wagon. More preferably, a signal feedline connectable to the entry segment is positioned on the body of the vehicle so as to be below a body aperture adapted to receive the respective rear window or rear quarter window and so as to be proximate a corner of the vehicle body.
- the antenna of the subject invention is what is known in the art as an "electrically small" antenna, meaning that the operative length of the antenna is less than one-half wavelength of received signals.
- the antenna of the preferred embodiments of the invention is particularly intended for broadcast frequency-modulated ("FM") signal reception, and more generally for handling signals with wavelengths 5 to 10 times the operative antenna length, which brings this antenna well within the classification of an electrically-small antenna. Electrically-small antennas are adapted to receive or transmit signals having vertical and/or horizontal polarization rather than circularly-polarized signals.
- FM broadcast frequency-modulated
- Figure 1 illustrates a pattern of a first conven- tional screen antenna
- Figure 2 illustrates a pattern of a second conventional screen antenna, and current flow in the antenna
- Figure 3 illustrates a first embodiment of a screen antenna of this invention, the antenna including a stub ground element for a coupled ground connection;
- FIG. 4 illustrates current flow in the first embodiment of the screen antenna of this invention
- Figure 5 illustrates a second embodiment of the screen antenna of this invention, the antenna including resonator circuitry at the ground connection;
- Figure 6 illustrates a third embodiment of the screen antenna of this invention, the antenna having a direct ground connection and no stub ground element;
- Figure 7 is a graph comparing return loss for the loop antenna of Figure 3 (coupled ground connection) and the loop antenna of Figure 6 (direct ground connection) ;
- Figure 8 is a graph comparing the sensitivity of a loop antenna with that of a rod antenna for AM signal reception;
- Figures 9(a) and 9(b) are polar diagrams illustrating vertically-polarised and horizontally-polarised VHF signal reception, respectively, for the antenna element of the subject invention in comparison to a conventional antenna element.
- One conventional type of screen antenna has an antenna element formed on a dielectric surface in an aperture of a vehicle body, as illustrated in Figure 1.
- the dielectric is normally a window.
- the antenna element is a simple monopole-type, fed at its base.
- the antenna currents are split equally between the antenna element and the car body.
- greatest-magnitude currents flow mainly vertically, resulting in an antenna with predominantly- ertical polarisation.
- FIG. 1 Another conventional type of screen antenna has an antenna element formed on a surface of a dielectric 8, as illustrated in Figure 2.
- a vertical feed wire 10 extends upward from a feed connection point 12 with a signal feedline 14 on the vehicle body to form one end of a closed.loop generally designated 16.
- the loop 16 further consists of a pair of generally-parallel horizontal wires 18 and 20, and a vertical wire 22 forming the other end of loop 16.
- This can operate at VHF frequencies and can also provide an AM element; however, the VHF performance for horizontal polarisation is not good.
- This configuration can be considered equivalent to a simple L-shaped element having a vertical segment connecting to a horizontal segment that extends to the left, with the left end being an open free end.
- the current diminishes toward the free end, and as such, the currents 18A and 20A along the horizontal wires 18 and 20 are small compared with the current 10A on the vertical feed wire 10; poor horizontal polarisation is the result.
- the invention consists of opening the loop and adding to lower horizontal wire 20 another vertical wire 24 that is closely spaced to feed wire 10.
- the wire 24 in one embodiment of the invention connects to a stub antenna element 26 extending along the edge of the window, less than 5mm from the vehicle body.
- the length of the stub antenna element 26 is adjusted to give a low impedance at the feed point and at the centre frequency of the VHF band of interest .
- An unbalanced transmission line 28, such as formed by a coaxial cable 29, feeds the antenna as shown in Figure 3.
- the stub antenna element 26 is isolated from the rest of the antenna at low frequencies, enabling its use as an AM antenna (where "AM” here connotes low-frequency broadcast signals (LW/MW/SW) having a frequency below approximately 6 MHz) .
- AM low-frequency broadcast signals
- the antenna loop should be spaced away from the vehicle body to reduce excessive capacitive loading, yet be made as large as possible to increase bandwidth and reduce impedance.
- the separation between loop and car body needs to be optimized for each application, but is typically 50mm to 100mm.
- Typical resulting currents are shown in Figure 4.
- the current 18B along the wire 18 is much greater than the current 18A of the closed loop of Figure 2, with a resultant increase in horizontal polarisation.
- the current diminishes with distance from signal feedline 14; however, the distance has now been increased by introducing a return path to ground.
- Currents 10B and 18B are of comparable magnitude, but are each larger than the currents 22B, 20B and 24B on the respective return wires 22, 20 and 24.
- the excitation current of the loop element of the invention is actually a combination of two current modes.
- the first current mode is the "odd” mode, which is similar to the conventional element of Figure 2, in which the return current to ground is zero .
- the second current mode is an "even” mode, whereby the current returning to ground connection point 26 is equal to the feed current.
- the net effect is a combination of two modes, and the combination will depend upon the physical structure and upon the wavelength of operation. Additionally, radiation also depends upon the "image" currents that flow in the body of the vehicle, close to connection point 12; however, such image currents are determined by the current structure on the element.
- the image currents 30 in the conventional case shown in Figure 2 are essentially vertical, whereas the image currents 32 for the loop antenna of the subject invention, shown in Figure 4, have a more two-dimensional nature, i.e. both horizontal and vertical .
- FIG. 5 A second embodiment of the invention is illustrated in Figure 5.
- the stub antenna 26 is not present, and the end of vertical wire 24 is connected to ground through a discrete series resonant circuit.
- the circuit ⁇ is illustrated in Figure 5 by an inductor L connected in series with a capacitor C, but any resonator element with similar properties might be used.
- This configuration maintains the VHF performance but also allows AM reception, i.e. the resonator element gives an 'open circuit' at AM.
- the discrete series resonant circuit might include circuitry to allow variable tuning for wider bandwidth. If AM reception is not required, then stub antenna element 26 is not present.
- This embodiment (as well as the other two) may include an electronic switch 36 (shown schematically in Fig.
- the antenna operates in a similar way to the L-shaped antenna shown in Fig. 2.
- the inclusion of the switch 36 allows a switched performance for polarisation diversity, i.e. reducing the horizontal polarisation while maintaining the vertical polarisation. It has been found that if the loop antenna of the invention is placed in the rear quarter window of a car, improved omni-directionality can be obtained by placing the feed point to the rear. Horizontal components of the ground current can then flow onto the rear of the vehicle body, below the window, and these enhance the horizontal component in the plane orthogonal to the window, thereby achieving good omni-directionality for both horizontal and vertical polarisation.
- the length of the antenna element on the dielectric is less than a wavelength, i.e. is less than the resonant length. This translates to a narrower bandwidth, as illustrated in the return loss graph of Figure 7; it is, however, wide enough for typical FM reception bandwidths, although some additional matching may be needed.
- the effect of using a coupled ground is shown compared with using a direct ground. It can be seen that the stub antenna element performs well, with similar characteristics to the direct ground connection (a small amount of detuning is caused by the reactance of the stub) . This is illustrated in Figure 8, using a high-impedance amplifier to buffer the element.
- the coupled ground can be optimized to tune the VHF receive band and to minimize the capacitive loading for AM reception.
- Figures 9 (a) and 9 (b) illustrate typical polar diagrams for screen antennas printed on the rear quarter window of a station wagon. Measurement is made at 98 MHz for both vertical and horizontal polarisations, using the proposed loop element of Figure 3 against the conventional loop element of Figure 2. An active matching circuit was used in both instances, providing around 5 dB of gain to each antenna (with received levels recorded in dBi) . As expected, in the vertical plane the new open- loop element performs similarly to a conventional closed- loop element. However, for the horizontal plane the conventional closed-loop element is seen to have a poor horizontal component, while the new open-loop element is more omni-directional and provides greater horizontally- polarised gain, comparable to gain in the vertical plane.
- a vehicular screen antenna includes a conductor extending on a dielectric, such as a window.
- the conductor is configured as a loop having entry and exit segments, the loop being positioned generally centrally on the dielectric.
- the entry and exit segments extend proximate each other from the loop towards a first edge of the dielectric and are oriented on the dielectric so as to extend generally vertically when the dielectric is fitted to a vehicle.
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- Details Of Aerials (AREA)
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/522,220 US7212167B2 (en) | 2002-07-24 | 2003-07-24 | Integrated loop antenna for vehicular applications |
AU2003248965A AU2003248965A1 (en) | 2002-07-24 | 2003-07-24 | Integrated loop antenna for vehicular applications |
JP2004522365A JP2005534215A (en) | 2002-07-24 | 2003-07-24 | Integrated loop antenna for vehicles |
EP03765204.7A EP1527498B1 (en) | 2002-07-24 | 2003-07-24 | Integrated loop antenna for vehicular applications |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB0217157A GB2391391A (en) | 2002-07-24 | 2002-07-24 | Integrated loop antenna for vehicular applications |
GB0217157.7 | 2002-07-24 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2004010529A1 true WO2004010529A1 (en) | 2004-01-29 |
Family
ID=9941018
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/GB2003/003260 WO2004010529A1 (en) | 2002-07-24 | 2003-07-24 | Integrated loop antenna for vehicular applications |
Country Status (6)
Country | Link |
---|---|
US (1) | US7212167B2 (en) |
EP (1) | EP1527498B1 (en) |
JP (1) | JP2005534215A (en) |
AU (1) | AU2003248965A1 (en) |
GB (1) | GB2391391A (en) |
WO (1) | WO2004010529A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE202009000782U1 (en) * | 2009-01-20 | 2009-06-04 | Delphi Delco Electronics Europe Gmbh | Vehicle window pane with electrically conductive structures |
EP2159872B1 (en) * | 2008-08-29 | 2012-08-15 | Asahi Glass Company, Limited | Glass antenna and window glass for vehicle |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20080036667A1 (en) * | 2006-08-10 | 2008-02-14 | Orest Fedan | Transmission line resonator loop antenna |
JP5931937B2 (en) * | 2014-02-04 | 2016-06-08 | 原田工業株式会社 | Patch antenna device |
JP6316738B2 (en) * | 2014-12-09 | 2018-04-25 | 日本板硝子株式会社 | Glass antenna for vehicles |
WO2024117114A1 (en) * | 2022-12-01 | 2024-06-06 | Agc株式会社 | Antenna device |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5565876A (en) | 1990-11-21 | 1996-10-15 | Nippon Sheet Glass Co., Ltd. | Window glass antenna |
EP0806808A2 (en) | 1996-05-08 | 1997-11-12 | Harada Industry Co., Ltd. | On- vehicle windowpane antenna apparatus |
EP0854533A1 (en) | 1997-01-16 | 1998-07-22 | Ford Motor Company | Antenna system for a motor vehicle |
US6160518A (en) | 1999-04-02 | 2000-12-12 | Visteon Global Technologies, Inc. | Dual-loop multiband reception antenna for terrestrial digital audio broadcasts |
Family Cites Families (16)
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JPS5148907Y1 (en) | 1970-03-04 | 1976-11-25 | ||
IT951602B (en) * | 1970-12-08 | 1973-07-10 | Saint Gobain | PROCEDURE FOR THE IMPROVEMENT OF THE RECEPTION CONDITIONS OF ANTENNA GLASSES FOR VEHICLES AND IMPROVED RECEPTION ANTENNA GLASSES |
DE3410415A1 (en) | 1984-03-21 | 1985-09-26 | Gerhard Prof. Dr.-Ing. 8012 Ottobrunn Flachenecker | ACTIVE AERIAL IN THE REAR WINDOW OF A MOTOR VEHICLE |
US5801663A (en) * | 1989-05-01 | 1998-09-01 | Fuba Automotive Gmbh | Pane antenna having at least one wire-like antenna conductor combined with a set of heating wires |
DE4000381A1 (en) | 1990-01-09 | 1991-07-11 | Opel Adam Ag | Slot antenna for car - uses integrated slot in bodywork sealed with plastics material |
US5205290A (en) * | 1991-04-05 | 1993-04-27 | Unger Evan C | Low density microspheres and their use as contrast agents for computed tomography |
US5583523A (en) * | 1992-01-06 | 1996-12-10 | C & K Systems, Incorporation | Planar microwave tranceiver employing shared-ground-plane antenna |
JP2795591B2 (en) * | 1993-01-27 | 1998-09-10 | セントラル硝子株式会社 | Glass antenna for vehicles |
GB2309829B (en) * | 1996-01-23 | 2000-02-16 | Wipac Group Limited | Vehicle on-screen antenna |
DE19726949B4 (en) | 1996-06-28 | 2007-06-21 | Alstom Gmbh | Slot line and coupling element for contactless transmission of information by means of electromagnetic waves between two relatively moving objects and connecting element for field-coupled connection of two sections of a slot line and connection element for field-coupled connection of a slot line to at least one electromagnetic waveguide of another type |
JPH10308620A (en) * | 1997-05-08 | 1998-11-17 | Harada Ind Co Ltd | Film antenna system for gps wave |
JP3452761B2 (en) * | 1997-05-15 | 2003-09-29 | 日本信号株式会社 | Loop antenna transmission device |
JP3159185B2 (en) * | 1998-09-29 | 2001-04-23 | セイコーエプソン株式会社 | Transmitter and receiver |
JP2001044729A (en) * | 1999-07-28 | 2001-02-16 | Central Glass Co Ltd | Glass antenna for vehicle |
JP2001227212A (en) * | 2000-02-17 | 2001-08-24 | Matsushita Electric Ind Co Ltd | Transmitter |
JP2001326514A (en) * | 2000-05-18 | 2001-11-22 | Sharp Corp | Antenna for portable radio equipment |
-
2002
- 2002-07-24 GB GB0217157A patent/GB2391391A/en not_active Withdrawn
-
2003
- 2003-07-24 AU AU2003248965A patent/AU2003248965A1/en not_active Abandoned
- 2003-07-24 WO PCT/GB2003/003260 patent/WO2004010529A1/en active Application Filing
- 2003-07-24 JP JP2004522365A patent/JP2005534215A/en active Pending
- 2003-07-24 US US10/522,220 patent/US7212167B2/en not_active Expired - Fee Related
- 2003-07-24 EP EP03765204.7A patent/EP1527498B1/en not_active Expired - Lifetime
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5565876A (en) | 1990-11-21 | 1996-10-15 | Nippon Sheet Glass Co., Ltd. | Window glass antenna |
EP0806808A2 (en) | 1996-05-08 | 1997-11-12 | Harada Industry Co., Ltd. | On- vehicle windowpane antenna apparatus |
EP0854533A1 (en) | 1997-01-16 | 1998-07-22 | Ford Motor Company | Antenna system for a motor vehicle |
US6160518A (en) | 1999-04-02 | 2000-12-12 | Visteon Global Technologies, Inc. | Dual-loop multiband reception antenna for terrestrial digital audio broadcasts |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2159872B1 (en) * | 2008-08-29 | 2012-08-15 | Asahi Glass Company, Limited | Glass antenna and window glass for vehicle |
DE202009000782U1 (en) * | 2009-01-20 | 2009-06-04 | Delphi Delco Electronics Europe Gmbh | Vehicle window pane with electrically conductive structures |
Also Published As
Publication number | Publication date |
---|---|
GB2391391A (en) | 2004-02-04 |
US20060097934A1 (en) | 2006-05-11 |
GB0217157D0 (en) | 2002-09-04 |
EP1527498A1 (en) | 2005-05-04 |
EP1527498B1 (en) | 2013-12-04 |
JP2005534215A (en) | 2005-11-10 |
US7212167B2 (en) | 2007-05-01 |
AU2003248965A1 (en) | 2004-02-09 |
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