WO2005043678A1 - Antenne cadre de reception - Google Patents

Antenne cadre de reception Download PDF

Info

Publication number
WO2005043678A1
WO2005043678A1 PCT/IB2004/052182 IB2004052182W WO2005043678A1 WO 2005043678 A1 WO2005043678 A1 WO 2005043678A1 IB 2004052182 W IB2004052182 W IB 2004052182W WO 2005043678 A1 WO2005043678 A1 WO 2005043678A1
Authority
WO
WIPO (PCT)
Prior art keywords
antenna
loop
capacitor
loop antenna
receiving loop
Prior art date
Application number
PCT/IB2004/052182
Other languages
English (en)
Inventor
Vincent Rambeau
Antoon M. H. Tombeur
Johannes H. A. Brekelmans
Jozef R. M. Bergervoet
Original Assignee
Koninklijke Philips Electronics N.V.
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 Koninklijke Philips Electronics N.V. filed Critical Koninklijke Philips Electronics N.V.
Publication of WO2005043678A1 publication Critical patent/WO2005043678A1/fr

Links

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
    • H01Q7/005—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 with variable reactance for tuning the antenna
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
    • H03J3/00—Continuous tuning
    • H03J3/20—Continuous tuning of single resonant circuit by varying inductance only or capacitance only

Definitions

  • the present invention refers to a television receiving loop antenna with UHF band.
  • Such an indoor UHF antenna is described in US Patent 6,429,828 and is a loop having a diameter of about 20 cm.
  • a television receiving loop antenna with UHF band is tunable. Therefore the diameter of the antenna is small in respect of the wave length. The diameter is only about 5 cm.
  • a broadcasted 470 MHz signal corresponds to a wave length of 64 cm.
  • a broadcasted 870 MHz signal corresponds to a wave length of 34 cm.
  • the signal to noise ratio is proportional to the directivity of the antenna. For a portable TV receiver an omni directional system is wanted. Ignoring the directivity of the antenna the smallest signal to noise ratio, SNR for short, is taken.
  • Fig. 1 is a systematic diagram of a tuned loop antenna used in explaining the principles of the invention
  • Fig. 2 is a schematic diagram of the equivalent circuit for the antenna shown in Fig. 1
  • Fig. 3 is a graph showing the noise factor versus the frequency for different loop diameters
  • Fig. 4A is an embodiment of an antenna with two loops and a capacitor plugged in parallel
  • Fig. 4B is an embodiment of an antenna tuned with a capacitor for a fine tuning and, with adding several loops in parallel for discrete steps
  • Fig. 1 is a systematic diagram of a tuned loop antenna used in explaining the principles of the invention
  • Fig. 2 is a schematic diagram of the equivalent circuit for the antenna shown in Fig. 1
  • Fig. 3 is a graph showing the noise factor versus the frequency for different loop diameters
  • Fig. 4A is an embodiment of an antenna with two loops and a capacitor plugged in parallel
  • Fig. 4B is an embodiment of an antenna tuned with a capacitor for a fine tuning and, with
  • FIG. 4C is an embodiment of an antenna with a loop and a LC parallel circuit plugged in parallel;
  • Fig.4D is a schematic diagram of the equivalent circuit for the antenna shown in Fig. 4C;
  • Fig. 4E is an embodiment of an antenna with two capacitors plugged in series;
  • Fig. 4F is an embodiment of an antenna with several tunable capacitors;
  • Fig. 4G is an embodiment of an antenna system with two independent antennas covering two different segments of one receiving band;
  • Fig. 5 is a preferred embodiment of a UHF handheld antenna;
  • Fig. 6A is a graph showing the noise figure versus the UHF band till 600 MHz;
  • Fig. 6B is a graph showing the noise figure versus the UHF band above 600 MHz;
  • Fig. 7A is a graph showing the bandwidth, derived from the Q, versus the frequency till 600 MHz and
  • Fig. 7B is a graph showing the bandwidth, derived from the Q, versus the frequency above 600 MHz
  • Figures 1 and 2 show a loop antenna 1 comprising a loop 2, a tune capacitor 3, Co for short, and a radiation resistance 4, Rr for short.
  • the loop 2 has a diameter 5.
  • An amplifier 6 amplifies a signal at the output 7 of the loop antenna 1.
  • the radiation resistance 4, a coil 8, Lo for short, a loss resistance 9, R ⁇ oss skin for short, and a voltage source 10 substitute loop 2.
  • An electromagnetic field 11, Hi or E/H field for short induces a voltage 12, Vi for short.
  • a signal to noise ratio at the input, SNRin for short is considering the noise of the radiation resistance 4, and the signal that is coming from the antenna.
  • a signal to noise ratio at an output 13, SNRout for short, is defined by :
  • SNRin-NFarchitecture- NF architecture is the noise figure of the tune capacitor 3 and the amplifier 6.
  • the capacitor 3 is plugged in parallel with the loop 2 to cancel out the capacitance for the noise and power matching to the amplifier 6.
  • the resonance of this system with the loop 2 is used to select the channel.
  • the tunable loop antenna 1 acts as an antenna and a tracking filter.
  • the loss resistance 9 due to the skin effect is present. This loss resistance 9 makes the antenna noisy.
  • the noise figure of the antenna 1 is then:
  • Loss resistance 9 in series with the radiation resistance 4 of the loop 2 or in series with the tune capacitor 3 should be minimized, as it will increase the total noise figure.
  • the loop antenna 1 with the coil 8, the radiation resistance 4 and the loss resistance 9 is tuned thanks to the capacitor 3.
  • the quality factor Q of this resonance circuit is then:
  • Figure 4 shows several architectures, which are then possible to increase the frequency without increasing the noise figure.
  • a current source is plugged on the antenna 31.
  • the E/H field emitted is identical to that of the Fig. 1 case when the same current flows in the Fig. 1 and Fig. 4A antennas 1 and 31. That means these two antennas 1 and 31 of Fig. 1 and Fig.
  • FIG. 4B illustrates an antenna 41, comprising a capacitor 42 and loops 43 - 45.
  • the capacitor 42 and the loops 43 - 45 are plugged in parallel.
  • the loops 43 - 45 comprise coils LI, L2 and L3.
  • the antenna 41 is tuned both with the tune capacitor 42 for a fine tuning and, with adding several loops 43 - 45 in parallel for discrete steps. This must be made without adding losses elements with respect to the radiation resistance.
  • FIG. 4C and 4D show a loop antenna 51 with a loop 52 plugged in parallel with a LC parallel circuit 53.
  • the LC parallel circuit 53 comprises a tunable capacitor 54, C 3 for short, and a coil 55, L for short. L is aimed at reducing the value of C 3 . It can be viewed as a negative capacitance which decreases with f.
  • the antenna 51 parameters are the same as in the Fig. 1 case.
  • FIG. 4E illustrates an antenna configuration 60 with an antenna 61 and an amplifier 62.
  • the antenna 61 comprises a loop 63 and three tune capacitors 64, 65 and 66, C a , Cb and Cc for short.
  • the loop 63 comprises a coil Li.
  • the loop 63 is in series with the capacitor 65.
  • a parallel circuit 68 composed of capacitors 64 and 65 and loop 63 is in series with the capacitor 66, which is connected to the amplifier 62.
  • a tap circuit 67 composed of Cb and C 0 adapts the antenna 61 to the amplifier 62.
  • the two tune capacitors 64 and 65 are plugged in series so as to increase the frequency.
  • the capacitors 64 and 65, C a and C b for short have a small series resistance because with a bigger series resistance this architecture 64, 65 of capacitors 64, 65 is not free of noise.
  • FIG. 4F illustrates an antenna 71 and an amplifier 72.
  • the antenna 71 comprises a loop 73 and six tune capacitors 74 - 79.
  • the loop 73 comprises a coil, Li for short.
  • Four tunable capacitors 74 - 77, twice C a and twice C b for short, are plugged in series.
  • the loop 73 is in series with the capacitors 74 and 77.
  • a first tap circuit 80 composed of capacitors 74 and 75 adapts the antenna 71 via the tune capacitor 78 and a second tap circuit 81 composed of capacitors 76 and 77 via the tune capacitor 79 to the amplifier 72. This is a way to get the signal differentially.
  • Fig. 4G illustrates an antenna systems 91 with a first antenna configuration 60 and a second antenna configuration 92.
  • the second antenna configuration 92 comprises an antenna 93 and an amplifier 94.
  • the antenna 93 comprises two parallel loops 95 and 96 and a tap circuit 97 composed of tune capacitors 98 and 99 to adapt the loops 95 and 96 to the amplifier 94 via a tune capacitor 100.
  • a total tuning range is achieved by switching the signal at outputs 103 and 104 of the configurations 60 and 92.
  • Both antenna configurations 60 and 92 are separated by a switch 101 to give their signal to a TV receiver 102. Compared to the solution shown in Fig. 4B the switch does not need to be ideal. It will less alter the resonance frequency, the Q and the NF. But this solution implies at least two times the similar tap circuits, and more loops.
  • Figure 5 shows UHF hand held antenna 111 and an amplifier 112.
  • the antenna comprises two loops 113, 114, a switch 115 and seven capacitors 116 - 121.
  • Each loop comprises a coil, Li for short.
  • the second loop 114 is added to the first loop 113 by the switch 115.
  • the capacitors 117 and 118 are variable capacitance diodes, C var , varicaps or varactors for short.
  • a series circuit 123 composed of the loop 113, the capacitor 119 and the varactor 118 is plugged in parallel to the varactor 117 and the capacitor 116.
  • a tap circuit 124 composed of the four capacitors 116 - 119 adapts the antenna 111 to the amplifier 112 via the tune capacitor 122.
  • Rr l.l ⁇ at 575MHz.
  • R ⁇ OSs sk i n 0.18 ⁇ at 575MHz.
  • CvARa and CvARb are two varicaps with the following parameter:
  • Cva r varies between: 2 pF to 20pF.
  • the capacitor 120, Cb for short, is added to reduce the series resistance of the varicap C VAR .
  • the capacitor 121, C a 0.4pF.
  • the series resistance for the R,L,C series resonator varies between 1.16 ⁇ (Cmin) to 0.47 ⁇ (Cmax).
  • the capacitance varies between 0.75pF to 1.67pF.
  • the switch 115 is added to achieve the highest frequencies range. When the switch 115 is off, the frequency range is 410 MHz to 615MHz. When the switch is on, the frequency range is 580 MHz to 870MHz.
  • Figures 6A and 6B show a noise figure, deduced for the above mentioned two frequency ranges. Therefore for the UHF band, the NF varies between 4.5dB to ldB.
  • Figures 7A and 7B show a bandwidth, derived from the Q. Therefore, for the UHF band, the bandwidth varies between 3MHz to 22MHz.
  • antenna system 111 UHF hand held antenna antenna configuration (second) 112 amplifier antenna 113 loop with Li amplifier 114 loop with Li loop (parallel) 115 switch loop (parallel) 116 capacitor tap circuit 117 varactor tune capacitor 118 varactor tune capacitor 119 capacitor tune capacitor 120 capacitor 121 capacitor 122 capacitor 123 series circuit 124 tap circuit

Landscapes

  • Details Of Aerials (AREA)
  • Variable-Direction Aerials And Aerial Arrays (AREA)
  • Support Of Aerials (AREA)
  • Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)

Abstract

L'invention se rapporte à une antenne cadre de réception à bande UHF pour des signaux télévisuels, fondée sur l'utilisation de la résonance d'une antenne cadre. Il existe différentes architectures pour accorder une antenne cadre sur la bande UHF, au moyen d'une pluralité de cadres disposés en parallèle, de bobines en parallèle, de condensateurs en série ou d'une pluralité d'amplificateurs. L'architecture de réception comprenant cette antenne présente une largeur de bande constante et un faible bruit.
PCT/IB2004/052182 2003-10-30 2004-10-22 Antenne cadre de reception WO2005043678A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP03104029 2003-10-30
EP03104029.8 2003-10-30

Publications (1)

Publication Number Publication Date
WO2005043678A1 true WO2005043678A1 (fr) 2005-05-12

Family

ID=34530777

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2004/052182 WO2005043678A1 (fr) 2003-10-30 2004-10-22 Antenne cadre de reception

Country Status (2)

Country Link
TW (1) TW200522441A (fr)
WO (1) WO2005043678A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008107807A1 (fr) * 2007-03-05 2008-09-12 Nxp B.V. Filtre radiofréquence
WO2015104479A1 (fr) * 2014-01-13 2015-07-16 Smart Packaging Solutions Antenne à fréquence de résonance ajustable, notamment pour carte à puce
WO2019025459A1 (fr) * 2017-08-01 2019-02-07 Antretter & Huber Gmbh Dispositif d'émission et/ou de réception
WO2019205629A1 (fr) * 2018-04-25 2019-10-31 京东方科技集团股份有限公司 Circuit d'amplification et antenne de redressement

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4804968A (en) * 1985-08-09 1989-02-14 Toyota Jidosha Kabushiki Kaisha Vehicle antenna system
DE8814993U1 (de) * 1988-01-04 1989-03-02 Oppermann, Richard, 7762 Ludwigshafen Antenneneinheit, bestehend aus Antennenschleife, Kondensator und Ankopplung
DE4327917A1 (de) * 1993-08-23 1995-03-09 Ralph Dipl Ing Meissner Magnetische Antenne
US5673054A (en) * 1991-05-09 1997-09-30 Seiko Epson Corporation Antenna and miniature portable wireless transceiver
US6144346A (en) * 1996-09-20 2000-11-07 Robert Bosch Gmbh Antenna arrangement
EP1168658A1 (fr) * 2000-01-11 2002-01-02 Mitsubishi Denki Kabushiki Kaisha Unite radio mobile
EP1217685A2 (fr) * 2000-12-12 2002-06-26 Matsushita Electric Industrial Co., Ltd. Résonateur en anneau et antenne

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4804968A (en) * 1985-08-09 1989-02-14 Toyota Jidosha Kabushiki Kaisha Vehicle antenna system
DE8814993U1 (de) * 1988-01-04 1989-03-02 Oppermann, Richard, 7762 Ludwigshafen Antenneneinheit, bestehend aus Antennenschleife, Kondensator und Ankopplung
US5673054A (en) * 1991-05-09 1997-09-30 Seiko Epson Corporation Antenna and miniature portable wireless transceiver
DE4327917A1 (de) * 1993-08-23 1995-03-09 Ralph Dipl Ing Meissner Magnetische Antenne
US6144346A (en) * 1996-09-20 2000-11-07 Robert Bosch Gmbh Antenna arrangement
EP1168658A1 (fr) * 2000-01-11 2002-01-02 Mitsubishi Denki Kabushiki Kaisha Unite radio mobile
EP1217685A2 (fr) * 2000-12-12 2002-06-26 Matsushita Electric Industrial Co., Ltd. Résonateur en anneau et antenne

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
CARR J J: "SMALL LOOP ANTANNAS FOR MW AM BCB, LF AND VLF RECEPTION PART 1 - INTRODUCTION AND THEORETICAL BACKGROUND", ELEKTOR ELECTRONICS, ELEKTOR PUBLISHERS LTD. CANTERBURY, GB, vol. 20, no. 223, 1 June 1994 (1994-06-01), pages 58 - 63, XP000483471, ISSN: 0268-4519 *

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008107807A1 (fr) * 2007-03-05 2008-09-12 Nxp B.V. Filtre radiofréquence
US9461608B2 (en) 2007-03-05 2016-10-04 Nxp B.V. Radio frequency filter
WO2015104479A1 (fr) * 2014-01-13 2015-07-16 Smart Packaging Solutions Antenne à fréquence de résonance ajustable, notamment pour carte à puce
FR3016481A1 (fr) * 2014-01-13 2015-07-17 Smart Packaging Solutions Antenne a frequence de resonance ajustable, notamment pour carte a puce
WO2019025459A1 (fr) * 2017-08-01 2019-02-07 Antretter & Huber Gmbh Dispositif d'émission et/ou de réception
WO2019205629A1 (fr) * 2018-04-25 2019-10-31 京东方科技集团股份有限公司 Circuit d'amplification et antenne de redressement
US11362630B2 (en) 2018-04-25 2022-06-14 Beijing Boe Optoelectronics Technology Co., Ltd. Amplifying circuit and rectifying antenna
US11923814B2 (en) 2018-04-25 2024-03-05 Beijing Boe Optoelectronics Technology Co., Ltd. Amplifying circuit and rectifying antenna

Also Published As

Publication number Publication date
TW200522441A (en) 2005-07-01

Similar Documents

Publication Publication Date Title
US6606069B2 (en) Antenna device
US10062629B2 (en) Antenna impedance matching and aperture tuning circuitry
EP1617564B1 (fr) Antenne a syntonisation variable et dispositif sans fil mobile mettant en oeuvre celle-ci
US9190733B2 (en) Antenna with multiple coupled regions
US6075491A (en) Chip antenna and mobile communication apparatus using same
KR20110044182A (ko) 안테나 유닛 및 방송 수신 단말 장치
US7956706B2 (en) Multiband filter having comb-line and ceramic resonators with different pass-bands propagating in different modes
US7129894B1 (en) Selectable length meander line antenna
US20080252549A1 (en) Antenna device
US10873309B2 (en) LC filter, radio-frequency front-end circuit, and communication device
KR20020086202A (ko) 고주파 필터장치와 송수신 안테나 공용 필터장치 및이들을 이용한 무선장치
KR101005169B1 (ko) 휴대 수신기
WO2005043678A1 (fr) Antenne cadre de reception
US20180198437A1 (en) Variable frequency filter and high-frequency front end circuit
US7307598B2 (en) Antenna device having enhanced reception sensitivity in wide bands
US11146242B2 (en) Filter device, multiplexer, radio frequency front end circuit, and communication device
JPH0476241B2 (fr)
US6087998A (en) Duplex antenna circuit assembly selectively operational in a transmit or a receive mode
EP2091151A1 (fr) Syntoniseur de télévision
US9035836B2 (en) Superimposed multimode antenna for enhanced system filtering
JPS6359105A (ja) 多周波数帯用小形アンテナ
AU2005282223B2 (en) Multiband filter
JPH0120806B2 (fr)
US20060238431A1 (en) Antenna
WO2006134533A1 (fr) Dispositif pour recevoir un signal de radiofrequence dans une bande de frequence

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A1

Designated state(s): AE AG AL AM AT AU AZ BA BB BG BR BW BY BZ CA CH CN CO CR CU CZ DE DK DM DZ EC EE EG ES FI GB GD GE GH GM HR HU ID IL IN IS JP KE KG KP KR KZ LC LK LR LS LT LU LV MA MD MG MK MN MW MX MZ NA NI NO NZ OM PG PH PL PT RO RU SC SD SE SG SK SL SY TJ TM TN TR TT TZ UA UG US UZ VC VN YU ZA ZM ZW

AL Designated countries for regional patents

Kind code of ref document: A1

Designated state(s): BW GH GM KE LS MW MZ NA SD SL SZ TZ UG ZM ZW AM AZ BY KG KZ MD RU TJ TM AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LU MC NL PL PT RO SE SI SK TR BF BJ CF CG CI CM GA GN GQ GW ML MR NE SN TD TG

121 Ep: the epo has been informed by wipo that ep was designated in this application
122 Ep: pct application non-entry in european phase