EP2528164A1 - Antennenvorrichtung zur verwendung in fahrzeugen - Google Patents

Antennenvorrichtung zur verwendung in fahrzeugen Download PDF

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Publication number
EP2528164A1
EP2528164A1 EP11734613A EP11734613A EP2528164A1 EP 2528164 A1 EP2528164 A1 EP 2528164A1 EP 11734613 A EP11734613 A EP 11734613A EP 11734613 A EP11734613 A EP 11734613A EP 2528164 A1 EP2528164 A1 EP 2528164A1
Authority
EP
European Patent Office
Prior art keywords
vehicle
coaxial cable
antenna device
amplifier circuit
filter
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.)
Withdrawn
Application number
EP11734613A
Other languages
English (en)
French (fr)
Other versions
EP2528164A4 (de
Inventor
Hiroyuki Kobayashi
Shuichi Tajima
Hisashi Fujisaki
Shoichi Negami
Yoichi Iso
Tomoyuki Fujieda
Masami Suzuki
Takeshi Ito
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.)
Pioneer Corp
Original Assignee
Furukawa Electric Co Ltd
Pioneer Solutions Corp
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 Furukawa Electric Co Ltd, Pioneer Solutions Corp filed Critical Furukawa Electric Co Ltd
Publication of EP2528164A1 publication Critical patent/EP2528164A1/de
Publication of EP2528164A4 publication Critical patent/EP2528164A4/de
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • H01Q1/3291—Adaptation for use in or on road or rail vehicles characterised by the location of the antenna on the vehicle mounted in or on other locations inside the vehicle or vehicle body
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/52—Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q23/00—Antennas with active circuits or circuit elements integrated within them or attached to them
    • 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
    • H01Q9/16—Resonant antennas with feed intermediate between the extremities of the antenna, e.g. centre-fed dipole
    • H01Q9/26—Resonant antennas with feed intermediate between the extremities of the antenna, e.g. centre-fed dipole with folded element or elements, the folded parts being spaced apart a small fraction of operating wavelength

Definitions

  • the present invention relates to a vehicle-mount antenna device mounted on a vehicle and, in particular, to a vehicle-mount antenna device in which an antenna element and a receiver are arranged so as to be positioned away from each other and are connected via a cable.
  • the coaxial cable connecting the antenna element and the receiver is routed at an inconspicuous place such as a bottom of a vehicle body
  • the coaxial cable is routed in a state of being near or in contact with a metal part of the vehicle body (hereinafter referred to as a vehicle body metal part).
  • a vehicle body metal part a metal part of the vehicle body
  • the coaxial cable and an amplifier circuit for amplifying a reception signal are unbalanced circuits, and therefore a mismatch occurs therebetween, thereby causing a common mode current in the coaxial cable.
  • This common mode current shielding characteristics of the coaxial cable are significantly degraded, and noise from the vehicle body metal part tends to flow into the coaxial cable.
  • FIG. 7 An example of a conventional vehicle-mount antenna device is shown in FIG. 7 .
  • FIG. 8 is an equivalent circuit diagram when a conventional vehicle-mount antenna device 900 is arranged so as to be near a vehicle body metal part 10.
  • FIG. 7(a) and FIG. 7(b) both are schematic structural diagrams of an antenna unit 910 configuring the conventional vehicle-mount antenna device 900, FIG. 7(a) being a front view and FIG. 7(b) being a rear view.
  • FIG. 8 an equivalent circuit when the antenna unit 910 is placed at a position away from a receiver and a coaxial cable connecting therebetween is routed near the vehicle body metal part is shown in FIG. 8 .
  • the antenna unit 910 is, by way of example, a wideband vehicle-mount antenna for use in an UHF frequency band.
  • the antenna unit 910 has a feeding element 911 and a parasitic element 912, the feeding element 911 being connected to an amplifier circuit 913 and the parasitic element 912 being connected to a ground plane 915 provided on a back surface of a circuit board 914.
  • the amplifier circuit 913 is connected to a center conductor 921 of a coaxial cable 920
  • the ground plane 915 is connected to an outer conductor 922 of the coaxial cable 920.
  • FIG. 8 shows how noise mixed from the vehicle body metal part 10 to the coaxial cable 920 propagates inside the vehicle-mount antenna device 900 when the coaxial cable 920 is routed near the vehicle body metal part 10 and is connected to a receiver 930. Since the coaxial cable 920 and the antenna unit 910 are arranged near the vehicle body metal part 10, capacitances (parasitic capacitances) are formed between these cable and unit and the vehicle body metal part 10. That is, capacitances C1 and C2 are formed between the vehicle body metal part 10 and the outer conductor 922 of the coaxial cable 920, and capacitances C3 and C4 are formed between the vehicle body metal part 10 and the feeding element 911 and between the vehicle body metal part 10 and the parasitic element 912, respectively.
  • capacitances C1 and C2 are formed between the vehicle body metal part 10 and the outer conductor 922 of the coaxial cable 920
  • capacitances C3 and C4 are formed between the vehicle body metal part 10 and the feeding element 911 and between the vehicle body metal part
  • the capacitance formed between the vehicle body metal part 10 and the outer conductor 922 of the coaxial cable 920 is divided into the capacitances C1 and C2 in FIG. 8 , and a capacitance at a position where noise is mixed into the outer conductor 922 is taken as C1, and a capacitance formed at another position is taken as C2.
  • a current I1 as common mode noise is mixed to the outer conductor 922 via the capacitance C1
  • currents when this current I1 flows inside the vehicle-mount antenna device 900 via the outer conductor 922 are shown as I2 to I5.
  • Part (a current I2) of the current I1 as common mode noise returns from the outer conductor 922 to the vehicle body metal part 10 via the capacitance C2, and the remaining current I3 flows into the circuit board 914.
  • an input impedance Z_A 50 ⁇
  • the current I3 part thereof (the current I4) flows into the parasitic element 912 via the ground plane 915 of the circuit board 914 on which the amplifier circuit 913 is mounted, and the remaining current I5 flows into the feeding element 911 via the input impedance Z_A.
  • the currents I4 and I5 return to the vehicle body metal part 10 via the capacitances C3 and C4 between the parasitic element 912 and the vehicle body metal part 10 and between the feeding element 911 and the vehicle body metal part 10.
  • a voltage drop occurring due to the input impedance Z_A and the current I5 becomes a voltage input to the amplifier circuit 913, is amplified by the amplifier circuit 913 and received as normal mode noise by the receiver 930, thereby degrading the antenna characteristics.
  • the current I5 passing through the input impedance Z_A is preferably reduced.
  • methods can be thought, including a method (a first method) of reducing the current I3 passing through the outer conductor 922 of the coaxial cable 920 and a method (a second method) of increasing the current 14 flowing to a parasitic element 912 side to reduce the current I5.
  • the current I5 can be reduced by relatively decreasing the impedance Z_G with respect to (Z_A+Z_F).
  • Measures to decrease Z_G have been conventionally known such as increasing the parasitic element 912 or increasing the capacitance C3 by bringing the parasitic element near the vehicle body metal part 10.
  • Patent Document 1 Japanese Patent Application Laid-open No. 2008-153738
  • the capacitance C2 significantly varies depending on how the coaxial cable 920 is routed and, as a result, noise characteristics also fluctuate, and therefore stable antenna characteristics cannot be obtained.
  • problems such as those in which it is difficult to decrease the size of the antenna unit and the shape, mount position, and mount conditions of the antenna unit are greatly restricted.
  • the present invention was made to solve the problems described above, and has an object of providing a vehicle-mount antenna device in which stable antenna characteristics can be obtained with an influence of common mode noise being reduced.
  • a first aspect of the vehicle-mount antenna device of the present invention includes an antenna unit having a feeding element and a parasitic element, a circuit board with a back surface including a ground plane, an amplifier circuit mounted on the circuit board and amplifying a reception signal received by the antenna unit, and a coaxial cable electrically connecting the amplifier circuit and a receiver, and the device further includes a filter for reducing common mode noise mixed in an outer conductor of the coaxial cable.
  • the filter is connected between the amplifier circuit and the coaxial cable, the feeding element is connected to the amplifier circuit, and the parasitic element is connected to the ground plane.
  • the filter is arranged between the amplifier circuit and the antenna unit, the feeding element is connected to the amplifier circuit via the filter, and the parasitic element is connected to the ground plane via the filter.
  • the feeding element and the parasitic element are arranged substantially parallel to a connecting direction in which the coaxial cable is connected to the amplifier circuit.
  • the filter is a common mode choke coil blocking common mode noise mixed in the outer conductor of the coaxial cable.
  • the filter is a choke coil for increasing an impedance on a side of the circuit board when viewed from the outer conductor of the coaxial cable.
  • the antenna unit has a wideband reception characteristic in a UHF frequency band.
  • FIG. 3 is a structural diagram showing a schematic structure of a vehicle-mount antenna device 200 and a receiving system 240 of the present embodiment
  • FIG. 4 is an equivalent circuit diagram when the vehicle-mount antenna device 200 of the present embodiment is arranged so as to be near a vehicle body metal part 10.
  • the vehicle-mount antenna device 200 of the present embodiment is configured of an antenna unit 210 and a connector-equipped coaxial cable 120 electrically connecting the antenna unit 210 and a receiver 130.
  • the antenna unit 210 includes a feeding element 111, a parasitic element 112, and a circuit board 114.
  • the circuit board 114 has a front surface where an amplifier circuit 113 is implemented and a back surface where an electrode pattern as a ground plane 115 of the amplifier circuit 113 is arranged, and a filter is arranged on a coaxial cable 120 side of the circuit board 114.
  • the feeding element 111 is connected to a + input of the amplifier circuit 113, and the parasitic element 112 is connected to the ground plane 115 of the amplifier circuit 113.
  • An output from the amplifier circuit 113 is connected to a center conductor 121 of the coaxial cable 120 via a filter 216, and the ground plane 115 is connected to an outer conductor 122 of the coaxial cable also via the filter 216.
  • a signal from the vehicle-mount antenna device 200 is transmitted to the receiver 130 via the coaxial cable 120.
  • the present embodiment is characterized in that the filter 216 is connected between the amplifier circuit 113 and the coaxial cable 120.
  • the receiver 130 While the antenna unit 210 is placed on a front windshield, a rear windshield, or the like of a vehicle suitable for receiving radio wave, the receiver 130 is placed at another position away from antenna elements. For this reason, the coaxial cable 120 connecting both together is routed through a relatively long distance.
  • the coaxial cable 120 has a center conductor 111 and an outer conductor 112, and is routed at an inconspicuous place such as a bottom of the vehicle. For this reason, at least part of the coaxial cable 120 is near the vehicle body metal part 10, and common mode noise tends to be mixed from the vehicle body metal part 10 to the outer conductor 112.
  • capacitances parasitic capacitances (hereinafter simply referred to as capacitances) formed by arranging the antenna unit 210 and the coaxial cable 120 near the vehicle body metal part 10 are shown as capacitances C1 to C4. Between the vehicle body metal part 10 and the outer conductor 122 of the coaxial cable 120, the capacitance C1 is formed at a position where noise is mixed and the capacitance C2 is formed at another position. Also, the capacitances C3 and C4 are formed between the vehicle body metal part 10 and the feeding element 111 and between the vehicle body metal part 10 and the parasitic element 112, respectively.
  • a current of noise mixed in the outer conductor 122 via the capacitance C1 is taken as I1, and currents when this current I1 flows inside the vehicle-mount antenna device 200 via the outer conductor 122 are taken as I2 to I5.
  • the current I1 which is part of the current I1
  • an input impedance Z_A 50 ⁇
  • the current I4 which is part of the current I3, flows into the parasitic element 112 via the ground plane 115 of the circuit board 114, and the remaining current I5 flows into the feeding element 111 via the input impedance Z_A.
  • the currents I4 and I5 return to the vehicle body metal part 10 via the capacitances C3 and C4 between the parasitic element 112 and the vehicle body metal part 10 and between the feeding element 111 and the vehicle body metal part 10.
  • the voltage input is amplified by the amplifier circuit 113 and received as normal mode noise by the receiver 130, thereby degrading the antenna characteristics.
  • the filter 216 is connected between the amplifier circuit 113 and the coaxial cable 120.
  • the current I3 is preferably reduced.
  • the impedance of a line (a conducting line) where I3 flows is preferably increased.
  • the filter 216 is connected between the coaxial cable 120 and the amplifier circuit 113.
  • the filter 216 desirably has a high impedance with respect to the current I3 derived from common mode noise and does not influence a normal mode signal from the antenna unit 210 toward the receiver 130.
  • a common mode choke filter is connected. With this, the filter 216 can cut off a common mode at a connecting point between the circuit board 114 and the coaxial cable 120 without influencing a normal mode signal, and common mode noise via the coaxial cable 120 can be inhibited from flowing into the amplifier circuit 113.
  • the impedance on the amplifier circuit 114 side when viewed from the outer conductor 122 of the coaxial cable 120 is increased by an impedance Z_CMC of the filter 216, thereby reducing the current I3 flowing through the ground plane 115 of the circuit board 114.
  • the conventional anti-noise measure (the first method) an effect of reducing the current 13 can be obtained without being influenced by the routing position of the coaxial cable 120.
  • the conventional anti-noise measure (the second method) can also be performed together.
  • the filter 216 a common mode current from the coaxial cable 120 toward the amplifier circuit 113 is inhibited by the filter 216, a common mode current from the ground plane 115 of the amplifier circuit 113 to the antenna elements 111 and 112 is not inhibited.
  • the ground plane 115 can be designed so as to be operated as part of the parasitic antenna element 112, thereby efficiently making effective use of space.
  • the antenna size can be designed so as to be maximum in a limited mount space, thereby making it possible to obtain excellent antenna characteristics.
  • common mode noise can be reduced by the filter 216 irrespectively of balanced or unbalanced type of the antenna elements 111 and 112. Also, since the high impedance characteristics with respect to the common mode does not depend on the wavelength, it is possible to easily reduce the size of the filter 216 and widen the bandwidth of the antenna elements 111 and 112. Furthermore, the shape and mount position of the antenna unit 210 are not restricted.
  • the common mode noise current I3 flowing to the amplifier circuit 113 can be reduced without being influenced by the routing position of the coaxial cable 120 and the placing position of an antenna unit 110.
  • normal mode noise from the amplifier circuit 113 to the receiver 130 can be reduced.
  • the antenna size can be designed so as to be maximum in a limited mount space, antenna gain can be increased, thereby obtaining excellent antenna characteristics.
  • stable antenna characteristics can be obtained without an influence of the routing position of the coaxial cable 120 or the like.
  • the shape and mount position of the antenna unit 210 are not restricted.
  • FIG. 1 is a structural diagram showing a schematic structure of a vehicle-mount antenna device 100 of the present embodiment
  • FIG. 2 is an equivalent circuit diagram when the vehicle-mount antenna device 100 of the present embodiment is arranged so as to be near the vehicle body metal part 10.
  • a filter 116 is connected between the amplifier circuit 113 and the feeding element 111 and the parasitic element 112 in the present embodiment.
  • the filter 116 can reduce the current IS and inhibit a flow of common mode noise to the amplifier circuit 113.
  • the impedance of a line (a conducting line) where I5 flows is preferably increased.
  • the impedance of the feeding element 111 is increased, desired antenna characteristics are degraded, and therefore it is required to increase the impedance of the conducting line of the current I5 without influencing the antenna characteristics.
  • the filter 116 is connected between the amplifier circuit 113 and the feeding element 111 and the parasitic element 112. As the filter 116, a balun can be used.
  • a choke balun (a choke coil) is used as the filter 116.
  • a choke balun as the filter 116 being connected between the antenna elements 111 and 112 and the amplifier circuit 113, the impedance with respect to the currents I4 and I5 is increased, thereby decreasing the currents 14 and I5.
  • the impedance on the amplifier circuit 113 side when viewed from the outer conductor 122 is increased, and the current I3 can also be decreased.
  • the conventional anti-noise measure the first method
  • an effect of reducing the current I3 can be obtained without being influenced by the routing position of the coaxial cable 120.
  • normal mode noise transmitted from the amplifier circuit 113 to the receiver 130 can be reduced, and excellent antenna characteristics can be obtained.
  • I ⁇ 5 I ⁇ 3 ⁇ Z_B + Z_G / Z_A + 2 ⁇ Z_B + Z_F + Z_G
  • Z_A is an input impedance between a + side input and a - side input of the amplifier circuit 113
  • Z_B is an impedance of the filter 116
  • Z_F is an impedance between the feeding element 111 and the vehicle body metal part
  • Z_G is an impedance between the parasitic element 112 and the vehicle body metal part 10.
  • the impedance Z_B of the filter 116 is preferably increased so as to increase the impedance on a circuit board 114 side when viewed from the outer conductor 122.
  • I3 can be reduced.
  • Z_B is sufficiently large, it can be seen from the equation above that the influences of the impedances Z_F and Z_G are relatively decreased. From this, the conventional anti-noise measure (the second method) of decreasing the impedance Z_G to increase the current I4 cannot be usedtogether, and therefore the effect is limited compared with the first embodiment.
  • the ground plane 115 cannot be designed as part of the parasitic element, the antenna size is also smaller than that of the first embodiment.
  • the filter 116 being connected between the circuit board 114 and the antenna elements 111 and 112
  • the current 15 flowing through a line side where the amplifier circuit 113 is connected can be reduced without being influenced by the routing position of the coaxial cable 120 and the placing position of the antenna unit 110.
  • normal mode noise flowing from the amplifier circuit 113 to the receiver 130 can be reduced, and excellent antenna characteristics can be obtained.
  • stable antenna characteristics can be obtained without an influence of the routing position of the coaxial cable 120 or the like.
  • the shape and mount position of the antenna unit 110 are not restricted.
  • the vehicle-mount antenna device 200 of the present embodiment To inspect the common mode noise reduction effect by the vehicle-mount antenna device 200 of the present embodiment, driving experiments were performed with the vehicle-mount antenna device 200 mounted on a vehicle. In the following, inspection results from the driving experiments are described.
  • the antenna unit 210 is mounted on a dashboard 11, the receiver 130 is placed below a rear seat, and a connection therebetween is made with the coaxial cable 120.
  • a reception signal of the antenna unit 210 is a Tokyo Tower DTV broadcast wave of 27 ch.
  • the driving experiments were performed in the case as shown in FIG. 5(a) where the coaxial cable 120 is in contact with the vehicle body metal part 10 for routing (the case is hereinafter referred to as a routing condition A) and the case where the coaxial cable 120 floats from the vehicle body metal part 10 by a length of 20 cm near the dashboard 11 (this portion is referred to as a cable sag portion 12) and the others are in contact with the vehicle body metal part 10 for routing (the case is hereinafter referred to as a routing condition B).
  • the cable sag portion 12 of the coaxial cable 120 is in a state of receiving radio waves, like the antenna elements 111 and 112.
  • reception power is increased more than the case of the routing condition A.
  • various electric wirings are routed, and the electromagnetic noise level nearby is high. From this, noise tends to be received in the case of the routing condition B.
  • the vehicle having the vehicle-mount antenna device 200 mounted thereon and the vehicle having the antenna device of the comparative example are caused to run on the same course according to the conditions described above, and reception power and CNR (Carrier vs. Noise Ratio) of each antenna are measured. Then, for each of the vehicle-mount antenna device 200 and the antenna device of the comparative example, a difference in the reception power and a difference in CNR between the case of the routing condition A and the case of the routing condition B at the same point (judged with GPS information) are calculated (which are referred to as a reception power difference and a CNR difference, respectively).
  • CNR Carrier vs. Noise Ratio
  • the reception power difference and the CNR difference at a same point i are calculated by the following equations.
  • Reception power difference (point i) reception power (routing condition B, point i)-reception power (routing condition A, point i)
  • CNR difference (point i) CNR (routing condition B, point i)-CNR (routing condition A, point i)
  • the reception power difference and the CNR difference in the equations above are calculated for each of the case in which the vehicle-mount antenna device 200 is mounted and the antenna device of the comparative example is mounted.
  • FIG. 6 Experiment results with the reception power difference being on the horizontal axis and the CNR difference being on the vertical axis are shown in FIG. 6 .
  • the reception power difference and the CNR difference are thought to represent the magnitude of influence of changes of the reception power and the CNR by the cable sag portion 12 in the case of the routing condition B.
  • a straight line C with a gradient 1 passing through an origin represents positions plotted when a change in reception power and a change in CNR are the same. That is, a plot deviation amount from the straight line C represents a difference in noise inflow between the cable routing conditions A and B. That is, when plots are distributed on the straight line C, this represents that no influence of change in noise due to the cable sag portion 12 is present.
  • FIG. 6(a) shows experiment results when the antenna device of the comparative example without having the filter 216
  • FIG. 6 (b) shows experiment results when the vehicle-mount antenna device 200 of the present embodiment is mounted. From FIG. 6 (a) when the device does not have the filter 216, pieces of experiment data are distributed by approximately 5 dB to a right side from the straight line C. That is, this means that the CNR is degraded by approximately 5 dB due to the cable sag part 12 when the same reception power is obtained. This shows that an inflow of noise due to the routing condition such as a sag of the cable cannot be prevented when the device does not have the filter 216.
  • the description in the present embodiments shows an example of the vehicle-mount antenna device according to the present invention and are not meant to be restrictive. Detailed structure, detailed operation, and others of the vehicle-mount antenna device in the present embodiments can be changed as appropriate within a range not deviating from,the gist of the present invention.

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EP11734613.0A 2010-01-21 2011-01-18 Antennenvorrichtung zur verwendung in fahrzeugen Withdrawn EP2528164A4 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2010011281A JP5547500B2 (ja) 2010-01-21 2010-01-21 車載用アンテナ装置
PCT/JP2011/050693 WO2011090007A1 (ja) 2010-01-21 2011-01-18 車載用アンテナ装置

Publications (2)

Publication Number Publication Date
EP2528164A1 true EP2528164A1 (de) 2012-11-28
EP2528164A4 EP2528164A4 (de) 2013-08-07

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EP11734613.0A Withdrawn EP2528164A4 (de) 2010-01-21 2011-01-18 Antennenvorrichtung zur verwendung in fahrzeugen

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EP (1) EP2528164A4 (de)
JP (1) JP5547500B2 (de)
WO (1) WO2011090007A1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TWI626787B (zh) * 2016-09-26 2018-06-11 群邁通訊股份有限公司 天線結構及具有該天線結構之無線通訊裝置

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6195502B2 (ja) * 2013-10-30 2017-09-13 双葉電子工業株式会社 アンテナ装置
JP7488777B2 (ja) 2021-01-27 2024-05-22 株式会社ヨコオ 端子接続構造、車載用アンテナ装置、端子接続構造の組み立て方法

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Publication number Priority date Publication date Assignee Title
DE3405044C1 (de) * 1984-02-13 1985-08-29 Rohde & Schwarz GmbH & Co KG, 8000 München Aktive Dipolantenne
EP0856904A2 (de) * 1997-01-31 1998-08-05 Asahi Glass Company Ltd. Fensterscheibenantenne für Kraftfahrzeug
DE10322186B3 (de) * 2003-05-16 2004-12-02 Karl Fischer Kurze Endgespeiste Dipolantenne
WO2009053404A1 (en) * 2007-10-24 2009-04-30 Tomtom International B.V. Antenna arrangement with reduced comm-mode signal
US20090207086A1 (en) * 2008-02-18 2009-08-20 Tomohiro Shinkawa Antenna apparatus

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JP3230278B2 (ja) * 1992-06-10 2001-11-19 ソニー株式会社 移動体アンテナ
JP4858971B2 (ja) 2006-12-14 2012-01-18 株式会社ヨコオ 広帯域化ループアンテナ
JP5204468B2 (ja) * 2007-11-30 2013-06-05 株式会社 Ｍｏｄａテクノロジー 低放射ノイズ電子機器、伝送線路接続ケーブル、および電子機器の放射ノイズ除去方法

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3405044C1 (de) * 1984-02-13 1985-08-29 Rohde & Schwarz GmbH & Co KG, 8000 München Aktive Dipolantenne
EP0856904A2 (de) * 1997-01-31 1998-08-05 Asahi Glass Company Ltd. Fensterscheibenantenne für Kraftfahrzeug
DE10322186B3 (de) * 2003-05-16 2004-12-02 Karl Fischer Kurze Endgespeiste Dipolantenne
WO2009053404A1 (en) * 2007-10-24 2009-04-30 Tomtom International B.V. Antenna arrangement with reduced comm-mode signal
US20090207086A1 (en) * 2008-02-18 2009-08-20 Tomohiro Shinkawa Antenna apparatus

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of WO2011090007A1 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TWI626787B (zh) * 2016-09-26 2018-06-11 群邁通訊股份有限公司 天線結構及具有該天線結構之無線通訊裝置

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WO2011090007A1 (ja) 2011-07-28
EP2528164A4 (de) 2013-08-07
JP5547500B2 (ja) 2014-07-16
JP2011151623A (ja) 2011-08-04

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