WO2011049351A2 - Antenne à bandes multiples utilisant un filtre lc - Google Patents

Antenne à bandes multiples utilisant un filtre lc Download PDF

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Publication number
WO2011049351A2
WO2011049351A2 PCT/KR2010/007162 KR2010007162W WO2011049351A2 WO 2011049351 A2 WO2011049351 A2 WO 2011049351A2 KR 2010007162 W KR2010007162 W KR 2010007162W WO 2011049351 A2 WO2011049351 A2 WO 2011049351A2
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WO
WIPO (PCT)
Prior art keywords
band
antenna
radiator
signal
filter
Prior art date
Application number
PCT/KR2010/007162
Other languages
English (en)
Korean (ko)
Other versions
WO2011049351A3 (fr
Inventor
박한수
유태환
김병남
Original Assignee
주식회사 에이스테크놀로지
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.)
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Publication date
Application filed by 주식회사 에이스테크놀로지 filed Critical 주식회사 에이스테크놀로지
Publication of WO2011049351A2 publication Critical patent/WO2011049351A2/fr
Publication of WO2011049351A3 publication Critical patent/WO2011049351A3/fr

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    • 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
    • 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
    • H01Q5/10—Resonant antennas
    • 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
    • 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
    • H01Q15/00—Devices for reflection, refraction, diffraction or polarisation of waves radiated from an antenna, e.g. quasi-optical devices
    • H01Q15/02—Refracting or diffracting devices, e.g. lens, prism
    • H01Q15/12—Refracting or diffracting devices, e.g. lens, prism functioning also as polarisation filter
    • 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
    • H01Q5/314—Individual or coupled radiating elements, each element being fed in an unspecified way using frequency dependent circuits or components, e.g. trap circuits or capacitors
    • H01Q5/321—Individual or coupled radiating elements, each element being fed in an unspecified way using frequency dependent circuits or components, e.g. trap circuits or capacitors within a radiating element or between connected radiating elements
    • 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 to an antenna, and more particularly, to a multi-band antenna for transmitting and receiving signals of multiple bands.
  • Conventional vehicle antennas include glass antennas mounted on the rear surface of a vehicle or micro strip line antennas implemented on a printed circuit board.
  • the micro strip line antennas may be embedded in a vehicle or externally mounted like a shark antenna. It also became.
  • vehicle antennas In addition to AM / FM signals, as signals of various bands such as DMB and GPS are required, vehicle antennas have been implemented as stand-alone antennas that can transmit and receive these bands, respectively, and as integrated antennas that can transmit and receive multiple bands with one antenna. It was also implemented.
  • AM / FM signals are relatively low frequency signals
  • DMB and GPS signals are relatively high frequency signals.
  • the radiation band of the antenna is inversely proportional to the length of the radiator, and for monopole antennas one quarter of the wavelength is set to the radiation band and for dipole antennas one half the wavelength Is set to the emission band.
  • the relationship between the length of the antenna radiator and the radiation band is also affected by the active antenna, which requires a higher amplification gain if the radiator length and the radiation band are not set properly.
  • the length of the radiator is set to receive signals in the AM / FM band, which is a low frequency band.
  • the length of the antenna radiator is set corresponding to the AM / FM band, the length of the radiator is not appropriate for reception of a signal of a high frequency band such as DMB.
  • the active antenna is mainly used for a vehicle antenna, a method of adjusting the amplification gain of the active antenna is used to reduce the reception characteristic, but it is difficult to overcome the degradation of the reception characteristic due to the improper length of the radiator only by adjusting the amplification gain. There was a side.
  • a method of distributing a signal of a high frequency band such as DMB using a separate distribution module has been conventionally proposed.
  • a distribution module is located at the rear of the amplification module in the active circuit and performs a function of separating high frequency signals such as DMB signals.
  • Another object of the present invention is to propose a multi-band antenna capable of simultaneously receiving a signal of a relatively low frequency band such as an AM / FM signal and a signal of a relatively high frequency band such as a DMB without deteriorating reception characteristics.
  • an antenna device for transmitting and receiving signals of a first band and a second band of higher frequency than the first band, comprising: an antenna radiator; And a filter unit coupled to the antenna radiator and blocking a current path corresponding to the second band.
  • the filter unit includes an inductor and a capacitor.
  • the inductor is inserted in the middle of the antenna radiator, and the capacitor is electrically connected to the antenna radiator and ground.
  • the combined position of the filter portion is set based on the length of the radiator required for reception of the second band.
  • the cutoff frequency of the filter unit is set based on the center frequency of the second band.
  • the antenna radiator may be coupled to a dielectric substrate or glass.
  • an antenna device for transmitting and receiving a multi-band signal, comprising: an antenna radiator; And at least one filter unit coupled to the antenna radiator and blocking a current path corresponding to the specific band.
  • a signal of a relatively low frequency band such as an AM / FM signal and a signal of a relatively high frequency band such as a DMB can be simultaneously received without deterioration of reception characteristics.
  • FIG. 1 is a view showing a radiator of a conventional vehicle antenna.
  • FIG. 2 is a conceptual diagram illustrating a multi-band antenna using an LC filter according to an embodiment of the present invention.
  • FIG 3 shows an example of a configuration of an LC filter circuit applied to an antenna radiator according to a preferred embodiment of the present invention.
  • FIG. 4 is a diagram showing a detailed structure of a multi-band antenna using an LC filter according to an embodiment of the present invention.
  • FIG. 5 is a diagram comparing the S11 parameters of a conventional multi-band antenna for vehicles and a multi-band antenna according to the present invention.
  • FIG. 1 is a view showing a radiator of a conventional vehicle antenna.
  • the antenna radiator is in the form of meanders bent over multiple to minimize spatial constraints. Since the vehicle antenna must be capable of transmitting and receiving signals in a low frequency band such as an AM / FM band, it is generally implemented in a structure that minimizes spatial constraints as shown in FIG. 1.
  • the portion denoted by A is a feed point to which a signal is supplied, and the portion denoted by B is an end of the vehicle antenna.
  • the vehicle antenna as shown in FIG. 1 is used to receive signals of a low frequency band such as AM signals of 535KHz to 1,605KHz band, FM signals of 88MHz to 108MHz band, and signals of relatively high frequency band such as DMB signals of 174MHz to 240MHz band.
  • signals of a low frequency band such as AM signals of 535KHz to 1,605KHz band, FM signals of 88MHz to 108MHz band, and signals of relatively high frequency band such as DMB signals of 174MHz to 240MHz band.
  • various frequency bands may be added and used.
  • the conventional vehicle antenna as shown in FIG. 1 may be implemented as a glass antenna and attached to the rear glass surface of the vehicle, or may be implemented as a micro strip line antenna and implemented on a substrate.
  • the length of a radiator is determined based on a lowest frequency band in a vehicle antenna implemented to receive a plurality of frequency bands with one radiator. For example, in a vehicle antenna implemented to receive AM / FM and DMB signals together, the length of the antenna is determined based on the AM frequency band, which is the lowest frequency band.
  • the total length of the conventional vehicle antenna radiator is generally set to about 500 mm based on AM / FM.
  • the length of such a radiator is not suitable for the signal of the high frequency band, so a signal that is not suitable for the length of the radiator receives a signal by using a separate distribution module in an active circuit.
  • Such a conventional antenna has a problem that the matching characteristics of a plurality of bands are directly connected to an active circuit and the isolation between the bands is not completely performed, thereby degrading antenna characteristics.
  • FIG. 2 is a diagram illustrating a conceptual diagram of a multi-band antenna using an LC filter according to an embodiment of the present invention.
  • a multi-band antenna using an LC filter may include an antenna radiator 200 and an LC filter 202.
  • the antenna radiator 200 is electrically connected to the feed point and functions to radiate a signal of a predetermined band.
  • the antenna radiator 200 may include a feeder 210, and the feeder 210 may be directly connected to a feeder line to receive power directly.
  • the antenna emitter 200 may be electrically spaced apart from a feeding preference by a predetermined distance. You may also receive a receiving coupling feed.
  • the antenna radiator 200 may be made of a conductive material, and may be implemented on a dielectric such as a substrate or glass, or may be implemented in a single structure that is not coupled to the dielectric.
  • the antenna radiator 200 may have various shapes such as linear, L-shaped, and meander shape.
  • the antenna radiator operates as a loop radiator.
  • the LC filter 202 is inserted into the antenna radiator 200 according to the embodiment of the present invention. Specific forms of the LC filter 202 will be described with reference to the separate drawings.
  • Conventional active antennas sometimes use LC filters for signal distribution, but the present invention differs in that LC filters are directly applied to antenna radiators.
  • Such an LC filter may be implemented using a general inductor and capacitor device.
  • An antenna according to an embodiment of the present invention is divided into a first region 250 before the LC filter and a second region 260 after the LC filter including the LC filter, based on the LC filter.
  • the length of the first region 250 is based on the length of the high frequency band among the frequency bands used by the antenna. For example, when the frequency band used is an AM / FM or DMB band, the length of the first region is determined based on the DMB band, which is a high frequency band. When the antenna operates in the monopole form, the length of the first region 250 may be set to 1/4 of the high frequency band wavelength. When the antenna operates in the dipole form, the length of the first region 250 may be the high frequency band wavelength. It can be set to 1/2 of.
  • the LC filter 202 acts as a band pass filter that blocks the current path in a particular frequency band.
  • the LC filter 202 operates to block the path of the high frequency signal in the frequency band of the antenna but not the current path of the low frequency band.
  • the current corresponding to the DMB frequency band does not pass through the LC filter 202, and the pass band of the LC filter is set so that the current corresponding to the AM / FM frequency band passes through the LC filter 202.
  • the antenna of the present invention operates only with the length of the first region 250. Accordingly, the length of the antenna is limited to the length of the first region 250 for the signal of the high frequency band, which means that the transmission and reception of the signal of the high frequency band operates at the appropriate antenna radiator length.
  • the antenna of the present invention with respect to the signal of the low frequency band is to operate the full length of the combined length of the first region 250 and the second region 260. Therefore, the antenna operates with a proper length even for a signal in a low frequency band such as AM / FM.
  • a high-gain amplifier is required in an active circuit part and a band-to-band isolation phenomenon is conventionally required for a signal of a high frequency band that transmits and receives a signal with an irradiator of an inappropriate length
  • a signal of a high frequency band has an appropriate length. Since it is received through the radiator of the conventional problem can be solved.
  • an LC filter is applied to a radiator to transmit and receive a signal of a high frequency band in a first region and a signal of a low frequency band in a second region, based on the LC filter. It will be apparent to those skilled in the art that the principle of is scalable to embodiments in which multiple LC filters are applied.
  • two or more LC filters may be applied to the antenna radiator.
  • the area of the antenna radiator may be divided into three based on the two LC filters, and transmission and reception of multiband signals in the first band, the second band, and the third band are possible. Do.
  • FIG 3 is a view showing an example of the configuration of the LC filter circuit applied to the antenna radiator according to an embodiment of the present invention.
  • an LC filter applied to an antenna radiator may include capacitors C1 and C2 connected in parallel with the radiator and ground, and an inductor L1 connected between the radiators. Can be.
  • FIG. 3 illustrates an embodiment in which one inductor L1 and two capacitors C1 and C2 are used, it will be apparent to those skilled in the art that the number of inductors and capacitors may vary depending on the frequency band for filtering. .
  • the inductance of the inductor L1 and the capacitances of the capacitors C1 and C2 are set corresponding to the frequency band to be cut off through the LC filter. Since setting the resonance frequency of the filter by adjusting the L and C values is a general technique known to those skilled in the art, a detailed description of the method of setting the L and C values will be omitted.
  • the LC filter may be designed using a general LC device and using a general filter design method.
  • FIG. 4 is a diagram showing a detailed structure of a multi-band antenna using an LC filter according to an embodiment of the present invention.
  • FIG. 4 illustrates an embodiment in which the LC filter illustrated in FIG. 3 is applied to the conventional multi-band vehicle antenna illustrated in FIG. 1.
  • the total antenna length may be about 500 mm.
  • the feeder 400 is a start end of the antenna and is a portion to which the RF signal is fed. As described above, the feeder 400 may receive a direct feed or a coupling feed.
  • the position of the LC filter part 420 composed of the capacitors C1 and C2 and the inductor L1 is set corresponding to the length of the radiator required in the DMB band.
  • the LC filter unit 420 is installed at a point 70mm past the feeder 400, which is the start of the antenna.
  • the length of the radiator required in the DMB band may vary depending on the installation environment and operation method of the antenna.
  • a chip inductor and a chip capacitor may be used to apply the LC filter unit 420 to the antenna radiator.
  • the chip inductor is inserted in the middle of the radiator.
  • chip capacitors When chip capacitors are used as capacitors C1 and C2, one end of the chip capacitor is coupled to the radiator and the other end of the chip capacitor is coupled to ground.
  • the inductor L1 and the capacitors C1 and C2 may be structurally implemented.
  • the capacitor may be implemented such that a conductor plate having a predetermined area between the ground and the radiator is spaced a predetermined distance apart.
  • the inductor L1 may be implemented in a structure in which thin conductors are bent over a plurality of radiators. Since such structural capacitors and structural inductors are general techniques known to those skilled in the art, detailed descriptions and structures thereof will be omitted.
  • the LC filter unit 420 operates as a radiator for a signal having a high frequency DMB band, and a whole region of the antenna operates as a radiator for a signal having a low frequency AM / FM band.
  • the LC filter unit 420 may be provided in plural numbers so that the LC filter unit 420 may be radiated to an appropriate length for the multi band instead of the dual band.
  • FIG. 5 is a diagram comparing the S11 parameters of a conventional multi-band antenna for vehicles and a multi-band antenna according to the present invention.
  • the return loss of the DMB band is improved by receiving signals of the DMB band according to the appropriate length, and thus the return loss of the FM band is improved while the isolation of the FM band and the DMB band is secured. .

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Abstract

L'invention concerne une antenne à bandes multiples utilisant un filtre LC. L'antenne selon l'invention est une antenne destinée à émettre et recevoir un signal dans une première bande et un signal dans une seconde bande ayant une fréquence supérieure à celle de la première bande. L'antenne selon l'invention comprend un élément rayonnant d'antenne et une unité de filtrage couplée à l'élément rayonnant d'antenne afin de couper le trajet de courant correspondant à la seconde bande. L'antenne selon l'invention est avantageuse en ce qu'on peut recevoir simultanément un signal sur une bande de fréquences relativement basses, comme un signal AM/FM, et un signal sur une bande de fréquences relativement élevées, comme un signal de diffusion numérique multimédia (DMB), sans dégradation des caractéristiques de réception.
PCT/KR2010/007162 2009-10-19 2010-10-19 Antenne à bandes multiples utilisant un filtre lc WO2011049351A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR1020090099430A KR20110042656A (ko) 2009-10-19 2009-10-19 Ｌｃ 필터를 이용한 다중 대역 안테나
KR10-2009-0099430 2009-10-19

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WO2011049351A2 true WO2011049351A2 (fr) 2011-04-28
WO2011049351A3 WO2011049351A3 (fr) 2011-07-07

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9553351B2 (en) 2012-12-03 2017-01-24 Pilkington Group Limited Glazing having antennas and a method of manufacturing said glazing

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102020327B1 (ko) * 2012-03-13 2019-09-10 엘지전자 주식회사 이동 단말기

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20040071639A (ko) * 2003-02-06 2004-08-12 푸바 오토모티브 게엠베하 운트 코. 카게 차량의 다수의 무선 통신 서비스용 결합 안테나 장치
JP2007180757A (ja) * 2005-12-27 2007-07-12 Yokowo Co Ltd 複数周波数帯用アンテナ
JP2009159480A (ja) * 2007-12-27 2009-07-16 Casio Comput Co Ltd 平面モノポールアンテナ及び電子機器

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3204631B2 (ja) * 1997-09-10 2001-09-04 株式会社ヨコオ 車載用アンテナ

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20040071639A (ko) * 2003-02-06 2004-08-12 푸바 오토모티브 게엠베하 운트 코. 카게 차량의 다수의 무선 통신 서비스용 결합 안테나 장치
JP2007180757A (ja) * 2005-12-27 2007-07-12 Yokowo Co Ltd 複数周波数帯用アンテナ
JP2009159480A (ja) * 2007-12-27 2009-07-16 Casio Comput Co Ltd 平面モノポールアンテナ及び電子機器

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9553351B2 (en) 2012-12-03 2017-01-24 Pilkington Group Limited Glazing having antennas and a method of manufacturing said glazing

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Publication number Publication date
WO2011049351A3 (fr) 2011-07-07
KR20110042656A (ko) 2011-04-27

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