EP1732164A1 - Antenne UHF pour système de diffusion de vidéo numérique - Google Patents

Antenne UHF pour système de diffusion de vidéo numérique Download PDF

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Publication number
EP1732164A1
EP1732164A1 EP05012530A EP05012530A EP1732164A1 EP 1732164 A1 EP1732164 A1 EP 1732164A1 EP 05012530 A EP05012530 A EP 05012530A EP 05012530 A EP05012530 A EP 05012530A EP 1732164 A1 EP1732164 A1 EP 1732164A1
Authority
EP
European Patent Office
Prior art keywords
antenna element
uhf
antenna
uhf antenna
loop
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP05012530A
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 EP05012530A priority Critical patent/EP1732164A1/fr
Publication of EP1732164A1 publication Critical patent/EP1732164A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q7/00—Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • 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
    • H01Q5/307—Individual or coupled radiating elements, each element being fed in an unspecified way
    • H01Q5/342—Individual or coupled radiating elements, each element being fed in an unspecified way for different propagation modes
    • H01Q5/357—Individual or coupled radiating elements, each element being fed in an unspecified way for different propagation modes using a single feed point
    • H01Q5/364—Creating multiple current paths
    • H01Q5/371—Branching current paths
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
    • H01Q9/04—Resonant antennas
    • H01Q9/30—Resonant antennas with feed to end of elongated active element, e.g. unipole
    • H01Q9/42—Resonant antennas with feed to end of elongated active element, e.g. unipole with folded element, the folded parts being spaced apart a small fraction of the operating wavelength

Definitions

  • the present invention relates in general to a UHF antenna which is intended to be used in digital video broadcasting terrestrial system (DVB-T system).
  • DVD-T system digital video broadcasting terrestrial system
  • a UHF antenna For use in a DVB-T system, which operates from about 450 MHz to about 850 MHz, a UHF antenna must have an operational bandwidth of about 400 MHz.
  • UHF antenna for use in a DVB-T system on automobiles, which UHF antenna is adapted to have two resonance frequencies between about 450 MHz and about 850 MHz located close together to achieve the necessary bandwidth of about 400 MHz.
  • a further object of the present invention is to provide a UHF antenna which is adapted to generate two resonance frequencies between about 450 MHz and about 850 MHz to achieve the necessary bandwidth of 400 MHz for a VSWR (voltage standing wave ratio) of less than 2 and a reference impedance of about 50 Ohm.
  • VSWR voltage standing wave ratio
  • the UHF antenna should offer a great "see-through” ability allowing the UHF antenna to be mounted on the front windshield of the car.
  • the UHF antenna of the invention has an antenna structure which comprises a loop antenna, and a U-shaped monopole antenna coupled to the loop antenna and arranged inside the loop antenna.
  • the loop antenna is used for the lower resonance frequency of about 500 MHz, and the U-shaped monopole antenna is designed to resonate at a higher frequency band of about 850 MHz.
  • the antenna structure is constructed to have a voltage standing wave ratio (VSWR) less than 2 with a reference impedance of about 50 Ohm.
  • VSWR voltage standing wave ratio
  • the UHF antenna of the present invention is intended to be operated in the UHF range, i.e. in the frequency band between about 450 MHz and about 850 MHz, and will be used to receive digital video signals from the DVB-T system. It is preferred that the UHF antenna is printed or etched on a solid substrate material or, more preferred, is printed on a transparent plastic foil which will glue on the glass of a car with a special adhesive glue. This will give to the UHF antenna a good degree of transparency.
  • the structure of the present UHF antenna comprises thin and narrow metal traces with large gap between them to produce a king of grid in order to have a "see through” effect.
  • a plurality of metal traces 2, 3, 5, 6 and 7 is printed or etched to a solid substrate or to a flexible transparent plastic foil element 1 (hereafter also referred as "carrier 1").
  • carrier 1 flexible transparent plastic foil element 1
  • the complete antenna unit A is connected to an electronic radio circuit 4 (printed circuit board) which is shown in Figure 2 more detailed.
  • the solid substrate or flexible transparent plastic foil 1 can be any supporting material, which will be able to support the antenna elements 2, 3, 5 and 6.
  • the kind of material will depend on the degree of transparency and the degree of flexibility needed as well as the material properties etc.
  • a possible material for the carrier 1 is a dielectric substrate, such as FR4, which (although not transparent) can provide a cheap manufacturing solution and good mechanical stability with good material properties.
  • the carrier 1 must be made out of a very thin transparent plastic foil, such as PET plastic or ABS. Due to its small thickness, the carrier foil is flexible with a high degree of transparency, and the antenna elements 2, 3, 5, 6 and 7 can be easily and cheaply printed or etched on the carrier foil 1. This is a very good solution if the antenna is to be used for an automobile where it will be glued on the front windshield of the car.
  • Figure 3 shows a cross sectional view of the complete antenna A, including the supporting carrier material 1 and a layer of glue 13 provided on the bottom surface of the carrier 1.
  • the metal traces 2, 3, 5, 6, 7 are provided on the top surface of the carrier 1.
  • the UHF antenna must have an operational bandwidth of about 400 MHz.
  • a VSWR (voltage standing wave ratio) of less than 2 and a reference impedance of 50 Ohm are desired, which is accomplished by the presence of a small ground plane such as the small electronic circuit 4 (see Figures 1 and 4).
  • the UHF antenna of the present invention is adapted to generate two resonance frequencies between about 450 MHz and about 850 MHz close together to achieve the necessary bandwidth of about 400 MHz for VSWR (voltage standing wave ratio) of less than 2, which is accomplished by using two main antenna elements 2, 3.
  • VSWR voltage standing wave ratio
  • the first main element 2 is a rectangular loop antenna, which goes all around the structure near the circumference of the carrier 1.
  • the loop antenna element 2 can also have a circular or polygonal shape.
  • the loop antenna element 2 is used for the lower resonance frequency of about 500 MHz, and consists of four main metal traces, denoted as elements 2 in Figure 1, to form the rectangular shape of the loop antenna element 2.
  • the metal traces 2 may have a different shape to form, for example, a rectangle having rounded corners, an oval, a circle or a polygon.
  • the second main element 3 is a U-shaped monopole antenna, which is a simple monopole in a U-shape having two main parts U' and U", for size reduction purposes, as shown in Figure 1.
  • This U-shaped monopole antenna element 3 is arranged inside the loop antenna element 2 and designed to resonate at a higher frequency band of about 850 MHz.
  • Each of the U-shaped monopole antenna element main parts U', U" comprises a loop-shaped portion formed by a plurality of metal traces 3', 3".
  • a preferred shape of the loop-shaped potions is shown in Figure 1, however, variations are possible (circular or polygonal).
  • additional elements i.e. metal traces 5' and 5", are provided to connect the corners of both loop-shaped monopole antenna element main parts U' and U" in order to increase the bandwidth of the higher resonance frequency and thus the bandwidth of the overall antenna A.
  • elements (metal traces) 6' and 6" are strategically arranged to connect the U-shaped monopole antenna element main parts U' and U" with the loop antenna element 2 to achieve a better impedance matching and bandwidth optimization.
  • loop antenna element 2 and the U-shaped monopole antenna element 3 are connected by means of the feed line element (metal trace) 7, which in turn connects the complete antenna system A to the electronic circuit 4.
  • the electronic circuit 4 comprises various electronic parts to improve the reception of the signals, as shown in Figure 2.
  • the electronic radio circuit 4 will provide the necessary filtering by passing through the signals of interest and rejecting the rest, by using a notch filter or band-pass filter 8. Thereafter, these filtered signals will be amplified by using a low noise amplifier (LNA) 9.
  • LNA low noise amplifier
  • the DC power for this amplifier 9 is provided from a bias-T element 10 which will pass-in the DC to the circuit and pass out the RF signals received.
  • the signals will be guided through the coaxial cable 11 to the DVB-T receiver/tuner box 12 (see Figure 2).
  • a notch filter 8 operating as a band-stop filter for the GSM (group special mobile) frequency band of about 900 MHz is connected to the feed line element 7 of the antenna.
  • the GSM signals are very close to the upper frequency limit of about 850 MHz, and these GSM signals will be received from the antenna A itself. Thus, these signals have to be reject by use of the notch or band-stop filter 8 since they are not of interest.
  • element 8 can be also a band-pass filter 8, which will pass through only the DVB-T signals and reject the rest.
  • LNA low noise amplifier
  • Element 10 is a bias-T, which is connected to the LNA 9 and which passes in direct current (DC) power to power up the active components, such as the LNA 9, and passes out the RF signals received.
  • DC direct current
  • Element 11 is a low loss coaxial cable with 50 Ohm reference impedance which is used to connect the active antenna (i.e. antenna A and elements 8, 9, 10) to the DVB-T tuner box 12.
  • the DVB-T tuner box 12 demodulates the digital signals and extrapolates the analog information, such as audio and analog video.
  • Figure 4 shows the measured VSWR of the UHF antenna of this invention. In the depicted frequency range from 450 MHz to 950 MHz, the measured VSWR is less than 2.
  • Figures 5, 6 and 7 show radiation patterns at 450 MHz, 650 MHz, and 850 MHz, respectively. These figures also show the peak gain values of 2,2 dBi, 3 dBi, and 4 dBi, respectively.
  • the antenna of the present invention is small and has a compact size, its radiation characteristic and peak gain values are kept to a good level.

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  • Details Of Aerials (AREA)
EP05012530A 2005-06-10 2005-06-10 Antenne UHF pour système de diffusion de vidéo numérique Withdrawn EP1732164A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP05012530A EP1732164A1 (fr) 2005-06-10 2005-06-10 Antenne UHF pour système de diffusion de vidéo numérique

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP05012530A EP1732164A1 (fr) 2005-06-10 2005-06-10 Antenne UHF pour système de diffusion de vidéo numérique

Publications (1)

Publication Number Publication Date
EP1732164A1 true EP1732164A1 (fr) 2006-12-13

Family

ID=34937370

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05012530A Withdrawn EP1732164A1 (fr) 2005-06-10 2005-06-10 Antenne UHF pour système de diffusion de vidéo numérique

Country Status (1)

Country Link
EP (1) EP1732164A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100767219B1 (ko) * 2006-04-27 2007-10-17 (주)파트론 Ｄｖｂ-ｈ 용 안테나 시스템 및 그를 이용한 이동형 무선 단말기
WO2010093308A1 (fr) * 2009-02-12 2010-08-19 Laird Technologies Ab Dispositif d'antenne, système d'antenne et dispositif de radiocommunication portable comprenant un tel dispositif d'antenne
CN104515936A (zh) * 2013-10-02 2015-04-15 大同股份有限公司 放电频域感测装置及使用其的油式变压器放电诊断设备

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1561742A (en) * 1976-08-07 1980-02-27 Siv Soc Italiana Vetro Multiband antenna for window panes
US6198943B1 (en) * 1999-05-17 2001-03-06 Ericsson Inc. Parasitic dual band matching of an internal looped dipole antenna
US6600450B1 (en) * 2002-03-05 2003-07-29 Motorola, Inc. Balanced multi-band antenna system
EP1450438A1 (fr) * 2001-11-28 2004-08-25 Nippon Antena Kabushiki Kaisha Antenne composite

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1561742A (en) * 1976-08-07 1980-02-27 Siv Soc Italiana Vetro Multiband antenna for window panes
US6198943B1 (en) * 1999-05-17 2001-03-06 Ericsson Inc. Parasitic dual band matching of an internal looped dipole antenna
EP1450438A1 (fr) * 2001-11-28 2004-08-25 Nippon Antena Kabushiki Kaisha Antenne composite
US6600450B1 (en) * 2002-03-05 2003-07-29 Motorola, Inc. Balanced multi-band antenna system

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100767219B1 (ko) * 2006-04-27 2007-10-17 (주)파트론 Ｄｖｂ-ｈ 용 안테나 시스템 및 그를 이용한 이동형 무선 단말기
WO2010093308A1 (fr) * 2009-02-12 2010-08-19 Laird Technologies Ab Dispositif d'antenne, système d'antenne et dispositif de radiocommunication portable comprenant un tel dispositif d'antenne
CN104515936A (zh) * 2013-10-02 2015-04-15 大同股份有限公司 放电频域感测装置及使用其的油式变压器放电诊断设备
CN104515936B (zh) * 2013-10-02 2017-12-22 大同股份有限公司 放电频域感测装置及使用其的油式变压器放电诊断设备

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