EP1732160A1 - Antenne double bande pour la radiodiffusion audio numérique - Google Patents

Antenne double bande pour la radiodiffusion audio numérique Download PDF

Info

Publication number
EP1732160A1
EP1732160A1 EP05012531A EP05012531A EP1732160A1 EP 1732160 A1 EP1732160 A1 EP 1732160A1 EP 05012531 A EP05012531 A EP 05012531A EP 05012531 A EP05012531 A EP 05012531A EP 1732160 A1 EP1732160 A1 EP 1732160A1
Authority
EP
European Patent Office
Prior art keywords
dual
band
antenna element
digital audio
monopole 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.)
Withdrawn
Application number
EP05012531A
Other languages
German (de)
English (en)
Inventor
Michail Tzortzakakis
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.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial Co Ltd
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 Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to EP05012531A priority Critical patent/EP1732160A1/fr
Publication of EP1732160A1 publication Critical patent/EP1732160A1/fr
Withdrawn legal-status Critical Current

Links

Images

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

Definitions

  • the present invention relates in general to a dual-band digital audio broadcasting system (dual-band DAB system), and in particular to a dual-band digital audio broadcasting antenna (dual-band DAB antenna) which is intended to be used in a dual-band DAB system and which is designed to be fitted on an automobile, for example, and in particular on the front glass of an automobile ("on-glass" antenna).
  • dual-band DAB system dual-band digital audio broadcasting system
  • dual-band DAB antenna dual-band digital audio broadcasting antenna
  • the dual-band DAB system comprising a dual-band DAB antenna usually operates at two frequency bands, the so-called "Band III" frequency band at frequencies from about 174 MHz to about 240 MHz, and the L-Band frequency band from about 1452 MHz to about 1492 MHz.
  • the dual-band DAB antenna when used on a glass carrier, such as the front glass of an automobile, must not have a uniform and solid structure but rather thin metal trace lines of small width with gaps and empty spaces between them, in order to achieve a kind of "see-through” effect, in order not to obstruct the view of the driver of the automobile.
  • a dual-band DAB film antenna of this type is described in JP 2000-295023 from Harada IND CO LTD, for example.
  • the dual-band DAB film antenna disclosed in this document comprises two monopole antenna elements, wherein the longer monopole antenna element designed for the "Band III" frequency band is bent to form a U-shaped monopole antenna element for slightly reducing the size of the "Band III” monopole element.
  • the prior art "Band III" monopole antenna element does not include an RF inductor, making the size and length of this U-shaped antenna element very large.
  • this known antenna does not provide the possibility to re-arrange the antenna structure in order to achieve a one or dual terminal connection to the corresponding electric circuit, with the result that the antenna design and especially the electronic circuit design is restricted.
  • a dual-band DAB antenna system and a dual-band DAB antenna comprising two monopole antenna elements having a different structure, i.e. a first meandered monopole antenna element designed for the Band III frequency band, and a second straight monopole antenna element designed for the higher frequency of the L-Band frequency band.
  • the Band III monopole antenna element can be series connected to an RF inductor element.
  • one terminal of the RF inductor element is connected to the Band III monopole antenna element and the other terminal of the RF inductor element is connected via the antenna feed point to the electronic radio frequency circuit.
  • this dual-band DAB antenna can provide a dual-band characteristic for dual-band DAB system in a very small and compact size, due to its unique structure and the optional provision of an RF inductor to the Band III monopole antenna element.
  • the first meandered monopole antenna element (Band III monopole antenna element) and the second monopole antenna element (L-Band monopole antenna element) are connected to form one antenna feeding point for connection to the electronic radio frequency circuit.
  • the DAB antenna structure can also be designed to have two feeding points, i.e. the first and second monopole antenna elements are separated and can independently connected to the electronic radio frequency circuit.
  • the antenna of this invention can either be designed to have one or two input terminals (feeding terminals), making the electronic circuit design more flexible and cost effective. Further, both arrangements allow the provision of an RF inductor connected to the first meandered Band III monopole antenna element.
  • the first and second monopole antenna elements are made of narrow metal traces with very small thickness. These metal traces are fitted on the top of a hard substrate or on the top of a very thin and transparent plastic layer (also referred as a carrier). Said carrier comprises on its topside the metal trace elements and on its bottom side a self-adhesive glue.
  • the complete unit is the "on-glass" antenna, which just glues on the glass window of a car.
  • a special plastic foil as the transparent plastic layer, a high degree of transparency for usage on a glass of a car can be achieved.
  • FIGS 1a and 1b show the first embodiment of the dual-band DAB antenna of the invention, wherein Figure 1a shows the DAB antenna being provided with an RF inductor, and Figure 1b shows the same DAB antenna, but without an RF inductor (explained below).
  • Both DAB antennas of Figures 1a and 1b comprise two main monopole antenna elements 1 and 2, and one common feeding terminal 4 adapted for connection to an electronic radio frequency circuit (shown in Figure 4).
  • the first monopole antenna element 1 has a meandered monopole structure designed for the Band III frequency band, i.e.
  • the second monopole antenna element 2 has a substantially straight monopole antenna structure designed for the higher frequency of the L-Band frequency band, i.e. frequencies from about 1452 MHz to about 1492 MHz.
  • Both monopole antenna elements 1 and 2 are connected together to form one common antenna feeding terminal 4 which will be connected to an electronic RF circuit 7 ( Figure 4).
  • the first meandered monopole antenna element 1, the second monopole antenna element 2, and the common feeding terminal 4 are narrow metal traces with very small thickness formed on the top surface of a hard substrate or a very thin and transparent plastic layer 5 (also referred as "carrier” or “carrier foil”).
  • the first monopole antenna element 1 of the DAB antenna of Figures 1a, 1b is designed to have a meandered structure in order to minimize the physical size of the antenna.
  • the electrical length of this meandered antenna element 1 should be equivalent to quarter of wavelength of the Band III frequency band (about 174 MHz to about 240 MHz).
  • the width of the trace line and the gap between the meander lines determine the impedance characteristic of the antenna and its frequency band resonance, i.e., the length of this meandered antenna element 1 determines the frequency band resonance.
  • Figure 6 shows the VSWR (voltage standing wave ratio) response of such a DAB antenna.
  • the second monopole antenna element 2 in Figures 1a and 1b has also a length of a quarter of wavelength, designed to operate at the higher frequency band of the L-Band (about 1452 MHz to about 1492 MHz).
  • the structure of the second monopole antenna element 2 is a straight metal trace except at the top where the metal trace is bent to minimize its overall size. At the top of the second monopole antenna element 2, the current distribution and the power flow is minimum. For this reason, it is possible to bend the second monopole antenna element 2 without significantly affecting the performance of this antenna element.
  • the width of the trace determines the frequency resonance and input impedance characteristic.
  • both monopole antenna elements 1, 2 are connected to the feeding terminal 4 in order to have to main resonances at the Band III and the L-band at the feeding terminal 4.
  • the carrier 5 for both monopole antenna elements 1, 2 and related components can be hard substrate material, e.g. FR4, or a transparent flexible plastic foil designed to support the metal traces.
  • the bottom side or surface of said carrier 5 is provided with self-adhesive glue 6, especially for automotive glass usage.
  • the degree of transparency of the carrier 5 must be very good, and the adhesive peeling strength must be quite high. Its operation temperature range must be large and must be UV and chemical resistant.
  • the plastic foil or hard substrate material (generally referred as carrier 5) have also some dielectric characteristic with a dielectric constant ranging from 2,5 to 4. This dielectric characteristic is also influencing the performance of the DAB antenna and should be taken into account in the design process.
  • the adhesive special glue 6 must provide good contact between the carrier 5 and glass for a wide range of temperatures. It must also withstand UV radiation from the sun and must have some chemical resistance.
  • All the elements i.e. the first meandered monopole antenna element 1, the second monopole antenna element 2, and the common feeding terminal 4, are provided on the top surface of the carrier 5, and the self-adhesive glue 6 is provided on the bottom surface of the carrier 5 as shown in the cross-sectional view of Figure 2.
  • both DAB antennas of the first embodiment as shown in Figures 1a and 1b, have a similar structure.
  • the DAB antenna of Figure 1a is provided with an RF inductor 3 making it possible to further reduce the size and length of the DAB antenna.
  • the meandered monopole antenna element 1 is connected to the RF inductor element 3 in series, i.e. between the meandered antenna element 1 and the common feeding terminal 4.
  • the RF inductor 3 as provided in Figure 1a is used to compensate the electrical length of the meandered monopole antenna element 1.
  • the meandered monopole antenna element 1 can be much shorter than a quarter of wavelength.
  • This RF inductor 3 is in value, the shorter the monopole antenna element 1 can be.
  • the usage of the RF inductor 3 is not always needed, as can be seen from Figure 1b.
  • This RF inductor 3 can be either inserted within the antenna element 1, when the carrier 5 is hard enough to support it or can be fitted inside a related electronic radio frequency circuit when a thin transparent and flexible plastic foil is used as the carrier 5.
  • Figures 3a and 3b show a second embodiment of the dual-band DAB antenna having a basic antenna structure similar to that of the DAB antennas shown in Figures 1a and 1b.
  • the dual-band DAB antennas of Figures 4a and 4b are designed to have two feeding terminals 4a and 4b.
  • both monopole antenna elements 1, 2 are adapted to allow separate connection to a related electronic radio frequency circuit (shown in Figure 5).
  • the structure of the DAB antenna of Figure 4a includes an RF inductor 3
  • the DAB antenna of Figure 4b does not have an RF inductor.
  • the DAB antenna as described above is adapted for connection to an electronic radio frequency circuit 7 to form an active DAB antenna.
  • Figure 4 shows an example of such an electronic RF circuit 7 for connecting the DAB antennas of Figures 1a and 1b having a single feeding terminal 4
  • Figure 5 shows an electronic RF circuit 7' for connecting the DAB antennas of Figures 3a and 3b.
  • the electronic RF circuit 7 comprises an RF filter or diplexer 8, an RF low noise amplifier (LNA) 9, a Bias-T element 10 to provide the DC power to the circuit, and an RF coaxial cable 11 which can be connected to the DAB tuner/receiver 12.
  • LNA low noise amplifier
  • Bias-T element 10 to provide the DC power to the circuit
  • RF coaxial cable 11 which can be connected to the DAB tuner/receiver 12.
  • the electronic RF circuit 7 includes a diplexer or RF filter 8 in case the antenna has one feeding terminal 4 (see Figures 1a and 1b), whereas the electronic RF circuit 7' of Figure 5 comprises band-pass filters 8' at each frequency band (i.e. Band III and L-Band) in case the DAB antenna has two feeding terminals (see Figures 3a and 3b).
  • these filters 8, 8' are used to pass through the in-band signals (wanted signals) and to reject the remaining unwanted signals which are present on the air and to compress even lower the noise floor level.
  • the RF circuit 7 of Figure 4 has a low noise amplifier (LNA) 9 which is used after filtering (filter 8) to amplify the wanted signals.
  • LNA low noise amplifier
  • the noise contribution of this amplifier 9 must be as small as possible in order to compress the noise even further and to amplify the main carrier signal mostly. This is very important especially for digital communication where the bit error rate depends on the signal-to-noise ratio, which must be high.
  • the noise figure of the complete system can be reduced for a more error free reception.
  • the electronic RF circuit 7' for the DAB antenna having two feeding terminals 4a, 4b is provided with two separate low noise amplifiers 9', which are connected to the corresponding Band III filter and L-Band filter, respectively.
  • the low noise amplifier(s) 9, 9' are connected to a bias-T 10 for supplying DC (direct current) power in order for the amplifier 9, 9' to work.
  • the DC power supplied from the bias-T gives DC to the circuit and passes RF power at the output.
  • an RF coaxial cable 11, 11' is used to connect the active antenna with the DAB tuner/receiver box 12, 12' and to bring DC power to the electronic circuit.
  • This cable 11, 11' should be selected to have minimum power loss.
  • the DAB tuner/receiver box 12, 12' (demodulator) is used to receive the wanted signals and extrapolate the digital information from these wanted signals. It also supplies DC power to the electronic circuit through the cable 11, 11' and the bias-T 10, 10'.
  • This DAB box 12, 12' is usually inserted inside the car.
  • Figure 7 shows several radiation patterns at different frequency points of 174 MHz, 240 MHz, 1425 MHz and 1492 MHz.
  • the complete electronic circuit can be housed within a plastic box, with some water and moisture resistance, to prevent corrosion or damage of the circuit from steam, heat and dust.

Landscapes

  • Details Of Aerials (AREA)
EP05012531A 2005-06-10 2005-06-10 Antenne double bande pour la radiodiffusion audio numérique Withdrawn EP1732160A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP05012531A EP1732160A1 (fr) 2005-06-10 2005-06-10 Antenne double bande pour la radiodiffusion audio numérique

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP05012531A EP1732160A1 (fr) 2005-06-10 2005-06-10 Antenne double bande pour la radiodiffusion audio numérique

Publications (1)

Publication Number Publication Date
EP1732160A1 true EP1732160A1 (fr) 2006-12-13

Family

ID=34982326

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05012531A Withdrawn EP1732160A1 (fr) 2005-06-10 2005-06-10 Antenne double bande pour la radiodiffusion audio numérique

Country Status (1)

Country Link
EP (1) EP1732160A1 (fr)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1983609A1 (fr) * 2007-04-19 2008-10-22 Societe de Composants Electriques Antenne multibande comprenant un support diélectrique, un aérien et un circuit électronique portés par le support
EP2051326A1 (fr) 2007-10-15 2009-04-22 Asahi Glass Company, Limited Antenne pour vitre d'une automobile
US7586452B2 (en) 2007-01-15 2009-09-08 Agc Automotive Americas R&D, Inc. Multi-band antenna
US7742006B2 (en) 2006-12-28 2010-06-22 Agc Automotive Americas R&D, Inc. Multi-band loop antenna
US7742005B2 (en) 2006-12-28 2010-06-22 Agc Automotive Americas R&D, Inc. Multi-band strip antenna
EP2273608A1 (fr) * 2009-07-08 2011-01-12 Nippon Sheet Glass Company Limited Antenne de pare-brise de véhicule
EP2355237A1 (fr) 2010-02-01 2011-08-10 Asahi Glass Company, Limited Antenne de vitre et vitre de fenêtre de véhicule la comportant
EP2458672A1 (fr) 2010-11-24 2012-05-30 Asahi Glass Company, Limited Appareil d'antenne et vitrage pour véhicule
WO2012105456A1 (fr) 2011-02-04 2012-08-09 旭硝子株式会社 Antenne intégrée dans du verre et vitre utilisée pour un véhicule la comportant
WO2012153664A1 (fr) 2011-05-12 2012-11-15 旭硝子株式会社 Antenne intégrée dans le pare-brise et vitrage
FR2998721A1 (fr) * 2012-11-23 2014-05-30 St Microelectronics Crolles 2 Circuit d'antenne exploitant simultanement plusieurs antennes independantes par une borne d'acces unique
GB2541852B (en) * 2014-07-10 2021-03-03 Motorola Solutions Inc Multiband antenna system

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6160518A (en) * 1999-04-02 2000-12-12 Visteon Global Technologies, Inc. Dual-loop multiband reception antenna for terrestrial digital audio broadcasts
EP1073141A2 (fr) * 1999-07-24 2001-01-31 Robert Bosch Gmbh Antenne adhérente sur vitre
US6188364B1 (en) * 1998-11-13 2001-02-13 Allgon Ab Matched antenna device and a portable radio communication device including a matched antenna device
WO2003079487A1 (fr) * 2002-03-15 2003-09-25 Nikolai Roshchupkin Antenne d'amplificateur

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6188364B1 (en) * 1998-11-13 2001-02-13 Allgon Ab Matched antenna device and a portable radio communication device including a matched antenna device
US6160518A (en) * 1999-04-02 2000-12-12 Visteon Global Technologies, Inc. Dual-loop multiband reception antenna for terrestrial digital audio broadcasts
EP1073141A2 (fr) * 1999-07-24 2001-01-31 Robert Bosch Gmbh Antenne adhérente sur vitre
WO2003079487A1 (fr) * 2002-03-15 2003-09-25 Nikolai Roshchupkin Antenne d'amplificateur

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7742005B2 (en) 2006-12-28 2010-06-22 Agc Automotive Americas R&D, Inc. Multi-band strip antenna
US7742006B2 (en) 2006-12-28 2010-06-22 Agc Automotive Americas R&D, Inc. Multi-band loop antenna
US7586452B2 (en) 2007-01-15 2009-09-08 Agc Automotive Americas R&D, Inc. Multi-band antenna
FR2915321A1 (fr) * 2007-04-19 2008-10-24 Composants Electr Soc D Antenne multibande comprenant un support dielectrique, un aerien et un circuit electronique portes par le support.
EP1983609A1 (fr) * 2007-04-19 2008-10-22 Societe de Composants Electriques Antenne multibande comprenant un support diélectrique, un aérien et un circuit électronique portés par le support
CN101414704B (zh) * 2007-10-15 2013-05-22 旭硝子株式会社 汽车用玻璃天线
EP2051326A1 (fr) 2007-10-15 2009-04-22 Asahi Glass Company, Limited Antenne pour vitre d'une automobile
EP2273608A1 (fr) * 2009-07-08 2011-01-12 Nippon Sheet Glass Company Limited Antenne de pare-brise de véhicule
CN101950853A (zh) * 2009-07-08 2011-01-19 日本板硝子株式会社 车辆用玻璃天线
EP2355237A1 (fr) 2010-02-01 2011-08-10 Asahi Glass Company, Limited Antenne de vitre et vitre de fenêtre de véhicule la comportant
EP2458672A1 (fr) 2010-11-24 2012-05-30 Asahi Glass Company, Limited Appareil d'antenne et vitrage pour véhicule
WO2012105456A1 (fr) 2011-02-04 2012-08-09 旭硝子株式会社 Antenne intégrée dans du verre et vitre utilisée pour un véhicule la comportant
WO2012153664A1 (fr) 2011-05-12 2012-11-15 旭硝子株式会社 Antenne intégrée dans le pare-brise et vitrage
US9300031B2 (en) 2011-05-12 2016-03-29 Asahi Glass Company, Limited Glass antenna and window glass
FR2998721A1 (fr) * 2012-11-23 2014-05-30 St Microelectronics Crolles 2 Circuit d'antenne exploitant simultanement plusieurs antennes independantes par une borne d'acces unique
US9379455B2 (en) 2012-11-23 2016-06-28 Stmicroelectronics Sa Antenna circuit using multiple independent antennas simultaneously through a single feed
GB2541852B (en) * 2014-07-10 2021-03-03 Motorola Solutions Inc Multiband antenna system

Similar Documents

Publication Publication Date Title
EP1732160A1 (fr) Antenne double bande pour la radiodiffusion audio numérique
US6906669B2 (en) Multifunction antenna
JP4370303B2 (ja) 車両用ガラスアンテナ
US8217845B2 (en) High frequency glass antenna for automobiles
US20030098813A1 (en) Dual antenna and radio device
US8350762B2 (en) Multi band built-in antenna
US20060132362A1 (en) Antenna device having radiation characteristics suitable for ultrawideband communications
CN104466393A (zh) 用于调谐多频带框形天线的设备
JP5476713B2 (ja) コネクタ及びこれを配置したアンテナ、並びにこのアンテナを備えた車両用窓ガラス
US6188364B1 (en) Matched antenna device and a portable radio communication device including a matched antenna device
US6911952B2 (en) Crossed-slot antenna for mobile satellite and terrestrial radio reception
JP2008271551A (ja) 自動車用のマルチバンド・アンテナ装置
EP1459410A1 (fr) Antenne multi-bande en bande large
EP2394331A1 (fr) Antenne
EP1657788A1 (fr) Arrangement d'antenne multibande avec une antenne tige disposée de façon concentrique avec une antenne microbande du type patch
JP2008278481A (ja) 自動車用高周波ガラスアンテナ及び自動車用の窓ガラス板
JP4986937B2 (ja) マルチバンドアンテナ
GB2409772A (en) Low profile antenna with end fed antenna trace formed upon a dielectric block mounted above PCB ground plane
US7091915B1 (en) Glass-mounted coupler and passive glass-mounted antenna for satellite radio applications
JP2011035520A (ja) アンテナ装置
EP1732164A1 (fr) Antenne UHF pour système de diffusion de vidéo numérique
JP2007036446A (ja) フィルムアンテナ給電部
CN107039755A (zh) 车辆用天线装置及车辆用天线装置用连接器
US6690330B1 (en) Glass-mounted coupler and passive glass-mounted antenna for satellite radio applications
JP2007174513A (ja) 自動車用高周波ガラスアンテナ

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU MC NL PL PT RO SE SI SK TR

AX Request for extension of the european patent

Extension state: AL BA HR LV MK YU

AKX Designation fees paid

Designated state(s): DE FR GB

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 20070614