EP1148581B1 - Antenne microruban - Google Patents

Antenne microruban Download PDF

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Publication number
EP1148581B1
EP1148581B1 EP00304669A EP00304669A EP1148581B1 EP 1148581 B1 EP1148581 B1 EP 1148581B1 EP 00304669 A EP00304669 A EP 00304669A EP 00304669 A EP00304669 A EP 00304669A EP 1148581 B1 EP1148581 B1 EP 1148581B1
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EP
European Patent Office
Prior art keywords
patch
radiation
ground
microstrip antenna
dielectric
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.)
Expired - Lifetime
Application number
EP00304669A
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German (de)
English (en)
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EP1148581A1 (fr
Inventor
Jae Kyun Bae
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Kosan Information and Technologies Co Ltd
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Kosan Information and Technologies Co Ltd
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Publication of EP1148581A1 publication Critical patent/EP1148581A1/fr
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    • 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
    • H01Q9/0407—Substantially flat resonant element parallel to ground plane, e.g. patch antenna
    • H01Q9/0421—Substantially flat resonant element parallel to ground plane, e.g. patch antenna with a shorting wall or a shorting pin at one end of the element
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q19/00—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic
    • H01Q19/005—Patch antenna using one or more coplanar parasitic 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
    • H01Q9/0407—Substantially flat resonant element parallel to ground plane, e.g. patch antenna
    • H01Q9/0442—Substantially flat resonant element parallel to ground plane, e.g. patch antenna with particular tuning means

Definitions

  • the present invention relates to a microstrip antenna.
  • the present invention relates to a microstrip antenna which can minimize leakage current by separately arraying a left radiation patch and a right radiation patch on an upper surface of a dielectric so that they have an electric field of the same phase, and which can minimize its size and thus can be built in various kinds of wireless communication equipment such as portable mobile terminals by improving its standing-wave ratio and gain so that it has a wide bandwidth.
  • frequencies mainly used in mobile radio communications are in the range of 150 ⁇ 900MHz. Recently, according to the rapidly increasing demand therefore, frequencies of a pseudo-microwave band in the range of 1 ⁇ 3GHz are also used.
  • PCS personal communication service
  • GMPCS 1.6GHz
  • IMT2000 2GHz
  • GMPCS next-generation mobile radio communication systems
  • the microstrip antenna has a better efficiency as a dielectric constant becomes lower, and a substrate becomes thicker. Also, since the microstrip antenna has a low efficiency in case of using a low frequency, but has a high efficiency in case of using a high frequency, it can be considered as the very antenna that can satisfy the limited condition of miniaturization that the portable telephone pursues.
  • a typical microstrip antenna has a structure in which radiation patches having a resonance length of ⁇ /2 are attached on a wide ground patch, and has the form of an array. Between the patches on the left and right sides of a feed point and the ground patch are formed lines of electric force. If the ground patch is short on the left and right sides of the feed point, this limits the formation of the lines of electric force, and thus lowers the gain of the antenna, causing the miniaturization of the antenna to be difficult.
  • the microstrip antenna has a simple structure in which a dielectric is formed on the ground patch, and rectangular or circular radiation patches are attached on the upper surface of the dielectric, and thus it has drawbacks in that it has a narrow bandwidth and a low efficiency.
  • it has advantages in that it can be manufactured at a low cost with a small size and a light weight, and thus it is suitable to mass production.
  • microstrip antenna can be designed on a circuit board together with solid-state modules such as an oscillator, amplifying circuit, variable attenuator, switch, modulator, mixer, phase shifter, etc.
  • solid-state modules such as an oscillator, amplifying circuit, variable attenuator, switch, modulator, mixer, phase shifter, etc.
  • the microstrip antenna as described above may be designed so as to have one or two feed points and circular or rectangular radiation patches in a satellite communication system that requires circularly polarized waves. Also, it can used for a Doppler radar, radio altimeter, remote missile measuring device, weapon, environmental machine and its remote sensor, transmission element of a composite antenna, remote control receiver, radiator for biomedicine, etc.
  • FIG. 1 is a side view illustrating a general microstrip antenna.
  • the general microstrip antenna has a radiation patch 1 both ends of which are open, and thus the current distribution of which is 0 and the voltage distribution of which is a maximum value.
  • a feed position is determined as the ratio of the current distribution value to the voltage distribution value in accordance with the resistance value of a feed line 2.
  • lines of electric force, 3 and 5 can be considered to be divided into a vertical component and a horizontal component, respectively.
  • the vertical components are cancelled due to their opposite phase to each other, and the horizontal components exist in array due to their same phase.
  • the length of the ground patch 6 in the microstrip antenna is determined to be short, the range where the lines of electric force, 3 and 5, exert is limited, and this results in attenuation of the gain. Thus, shortening the ground patch 6 cannot achieve the miniaturization of the antenna.
  • the microstrip antenna is a unit of a VHF/UHF band, and is required to have a compact and light-weighted structure.
  • a quarter-wavelength microstrip antenna QMSA
  • PMSA post-loading microstrip antenna
  • WMSA window-attached microstrip antenna
  • FVMSA frequency-variable microstrip antenna
  • the PMSA, WMSA, and FVMSA are provided by partially modifying the QMSA, and thus basically have similar radiation patterns to one another.
  • FIG. 2 is a perspective view illustrating the structure of a conventional QMSA.
  • a radiation patch 23 and a ground patch 21 are constructed so that they have an identical width W, and the ground patch 21 extends in a direction opposite to a radiation opening 22 to provide a small-sized antenna that can be mounted in a limited space of a small-sized radio device.
  • a dielectric 22 and the radiation patch 23 are successively attached to the ground patch 21 of ⁇ g (guide wavelength)/2, one end of the ground patch 21 is short-circuited to the radiation patch 23, and the length of the radiation patch 23 is determined to be ⁇ g/4 to have a fixed frequency range.
  • an outer conductor of a feed line 24 is grounded to the ground patch 21, and an inner conductor (center conductor) of the feed line 24 is connected to the radiation patch 23 through the ground patch 21 and the dielectric 22 (Japanese Electronic Information Society, Vol. J71-B, 1988.11.).
  • dielectric 22 Japanese Electronic Information Society, Vol. J71-B, 1988.11.
  • FIG. 3 shows the variation of the gain ratio according to the variation of Gz in FIG. 2.
  • 0(dB) represents the gain of a basic half-wavelength dipole antenna.
  • Gz plays a very important role for determining the increasing rate of radiation.
  • FIG. 4 shows the variation rate of gain according to the whole length L of the antenna of FIG. 2, and
  • FIG. 5 shows the gain ratio to the width W of the radiation patch 23 of FIG. 2.
  • FIG. 6 shows the measured radiation property of the QMSA of FIG. 2.
  • (A), (B), (C) represent an XY plane, YZ plane, and ZX plane, respectively.
  • the QMSA of FIG. 2 is an electric field antenna having the radiation patterns in all propagation directions.
  • the transmission/reception sensitivity of the electric field antenna deteriorates due to the diffraction, reflection, etc., of the signal, and this causes the communication to be disturbed.
  • the current radio equipment or system uses a spatial diversity, directional diversity, polarized diversity, etc. Meanwhile, two or more antennas may be installed to solve the low reception sensitivity caused by a multipath.
  • the PMSA which is a modified microstrip antenna
  • two radiation open surfaces are formed on both sides of a radiation patch
  • a short-circuited post is connected to a ground patch and the radiation patch through a dielectric instead of a short-circuited end of the QMSA antenna, and a feed line is located at a predetermined distance from the short-circuited post.
  • the PMSA has two open surfaces, the radiation pattern thereof is substantially similar to that of the QMSA.
  • a slit is formed at a predetermined distance from the radiation patch of the QMSA to have a reactance component, and thus the length of the radiation patch can be shortened.
  • the resonance frequency of the QMSA can be electronically changed in accordance with the change of the reactance load value.
  • the conventional modified microstrip antennas i.e., the QMSA, PMSA, WMSA, and FVMSA have drawbacks in that if the ground patch is determined to be small, the radiation open surfaces become narrow, and their gains are rather attenuated, so that they cannot become small-sized. Also, if they are used for portable radio equipment, the field strength thereof deteriorates due to walls of a building and various metals in the building, and the receiving sensitivity deteriorates due to the multipath interference.
  • US-A-5781158 discloses a microstrip antenna having a dielectric element sandwiched between a radiation patch arrangement and a ground plate, the patch arrangement comprising first and second radiation patches with a slot between them.
  • a microstrip antenna comprising a dielectric element sandwiched between a radiation patch arrangement and a ground patch, the ground patch including first and second ground plates connected by a bridge plate, the radiation patch arrangement comprising a first radiation patch, connected to the first ground plate, and a second radiation patch, connected to the second ground plate, arranged so as to form a radiation slot between the first and second radiation patches; and further comprising a feed line connected to one of the radiation patches characterised in that the width of the bridge plate is smaller than the width of the first and second ground plates.
  • FIG. 7 is a perspective view illustrating the structure of the microstrip antenna according to the present invention.
  • the microstrip antenna according to the present invention includes a dielectric 50 laminated on a ground patch 40 as shown in FIG. 7.
  • a left radiation patch 61 is positioned in such a way that it is short-circuited with one end of the ground patch 40
  • a right radiation patch 62 is positioned in such a way that it is short-circuited with the other end of the ground patch 40.
  • a gap is provided between the left and right radiation patches (They are apart from each other at a spacing of 0.5mm, and the gap is referred to as a radiation slot 70).
  • the microstrip antenna made of such a radiation slot 70 is capable of loading the capacity between the left radiation patch 61 and the right radiation patch 62, such that the formation of the line of electric force is not limited, causing the antenna to be more easily miniaturized.
  • the gain on the capacity-loaded side is increased more than that on the ground patch 40, such that it has a radiation pattern with a larger gain, thereby being preferably used as an antenna in the service band of PCS.
  • the microstrip antenna 100 has a gain which is increased by 1 to 1.76 dB on the capacity-loaded side relative to the ground patch 40, and has a radiation pattern with a maximum electric field of 2dB which is larger than that of the prior dipole antenna, thereby being preferably used in various wireless devices.
  • the thickness H1 of the dielectric 50 and the width of the capacity-loaded side can be adjusted to increase or reduce the bandwidth and the gain, and the point position of the feed line 30 can be variably adjusted to eliminate the fringe effect of the feed point of the feed line, thereby overcoming actively the indefinite distribution of the feed line.
  • FIG. 8 is a plane view illustrating the structure of the microstrip antenna according to the present invention.
  • the microstrip antenna 100 of FIG. 8 is an example wherein, when the whole length l 1 is 25mm, the length l 2 of the left patch 61 is 14.5mm, and the length 4 of the right patch 62 is 10mm, taking into consideration the width of the radiation slot 70, namely, the length 3, corresponding to 0.5mm, and wherein the width W1 is 15mm.
  • FIG. 9 is a bottom view illustrating the structure of the microstrip antenna according to the present invention.
  • the ground patch 40 serving as the ground of the microstrip antenna provides a feed line point on which a feed line 30 is positioned.
  • the central conductor of the feed line 30 extends towards the width center of the right radiation patch 62 adjacent to the radiation slot 70 via the ground patch 40 and the dielectric 50.
  • the outer conductor of the feed line 30 is connected to the ground patch 40.
  • the feed line 30 is spaced apart and separated from each of the left and right radiation patches 61 and 62 in a state in which the dielectric 50 is interposed therebetween. By virtue of the dielectric 50, the feed line 30 is electronically coupled to each of the left and right radiation patches 61 and 62.
  • the ground patch 40 includes a right triangle ground plate 41 having an area extending from the core conductor of the feed line 30 to both corners of the dielectric 50 at which the right radiation patch 62 is short-circuited.
  • the ground patch 40 also includes a connecting plate 42 extending from the core conductor of the feed line 30 towards the left radiation patch 61, and a left ground plate 43 covering the under surface of the dielectric 50.
  • both sides of the connecting plate 42 of the ground patch 40, to which the feed line 30 is connected are opened, the current distribution of both sides becomes zero, and the voltage distribution becomes maximum.
  • the whole length of the microstrip antenna 100 is 25mm
  • the length l 5 of the right ground plate 41 is 5mm
  • the length l 6 of the connecting plate 42 is 6mm
  • the length l 7 of the left ground plate 43 is 14mm.
  • the whole length 1 of the microstrip antenna 100 is 15mm, it is preferable to design the microstrip antenna 1'00 such that the core conductor of the feed line 30 is connected at a point of 7.5mm distance from an end of the dielectric 50, that is, the center of the width of the dielectric 50, and that the width W2 of the connecting plate 42 is 2mm. Also, the whole thickness H1 of the microstrip antenna 100 is 3.2mm, as shown in FIG. 10.
  • the microstrip antenna 100 according to the above embodiment of the present invention comprises the ground patch 40 with both sides being opened by taking the connecting plate as a standard line, thereby providing inherent characteristics which will be explained below.
  • the ground patch 40 has to be mounted apart from, for example, the printed circuit board of a portable mobile terminal (wireless telephone) to which the microstrip antenna 100 is applied.
  • FIG. 10 is a side view illustrating the structure of the microstrip antenna according to the present invention.
  • the ground patch 40 is directly mounted on the printed circuit board of the portable mobile terminal, since it is meaningless that both sides are opened by taking the connecting plate 42 as a base line, the ground patch 40 is bent from the center of the left radiation patch 61 to the left ground plate 43 through the side of the dielectric 50, and has a bent mounting piece 80 to provide a height H2 apart from the printed circuit board.
  • the mounting piece 80 maintains the condition of the microstrip antenna 100 apart from the printed circuit board of the mobile terminal, for example the apart height of 3mm, so that the function of the ground patch 40 can be effected at a maximum.
  • the length T1 of the mounting piece 80 mounted on the upper surface of the left radiation patch 61 and the lower surface of the left ground plate 43 is 3mm, respectively, and its width S1 is 8mm, the bent width S2 is 2mm, and its length T2 is 2.7mm.
  • the microstrip antenna 100 of the present invention is used as a transmission/reception antenna of a flying object such as a rocket, missile, airplane, etc., and may be designed on a circuit board together with solid-state modules such as an oscillator, amplifying circuit, variable attenuator, switch, modulator, mixer, phase shifter, etc.
  • a dipole antenna, a Yagi antenna, or the like is used in the portable mobile terminal.
  • the dipole antenna is a resonance antenna of a half wavelength and has a characteristic of all directional radiation, such that it is used for an antenna of a mobile terminal in cellular communication and a service antenna of a small relay.
  • the Yagi antenna is made of a laminated dipole antenna to enhance directional gain and is used for an antenna of a small relay.
  • microstrip antenna 100 is used for a personal mobile communication service using a cellular phone and personal communication service, a wireless local looped service, future public land mobile telecommunication system, and variable wireless communication comprising satellite communication to transmit and receive the signal between the base station and the mobile terminal.
  • the prior microstrip laminated antenna is a resonance antenna, it has drawbacks in that it has a very narrow bandwidth of frequency and a low gain. Accordingly, a great number of sheets of patches must be laminated or arrayed. This results in an increase in the size and thickness of the antenna. For this reason, it is difficult for the prior antenna to be mounted on personal mobile terminals, mobile communication repeaters, wireless communication equipment or the like.
  • the microstrip antenna according to the present invention can minimize leakage current by separately arraying a left radiation patch and a right radiation patch on an upper surface of a dielectric so that they have an electric field of the same phase, and can be minimized in its size and thus can be built in various kinds of wireless communication equipment such as portable mobile terminals by improving its standing-wave ratio and gain so that it has a wide bandwidth.
  • FIG. 12 is a graph illustrating the return loss with respect to the frequency of the microstrip antenna according to the present invention.
  • its service band is in the range of 1,750 to 1,870MHz, and its bandwidth is above 120MHz (above about 160MHz), so that it can be more easily adapted to the personal communication service.
  • the microstrip antenna according to the present invention shows that since the reflecting loss in the range of 1,750 to 1,870MHz is -10dB, the loss value to the reflecting current is very preferable. Further, its bandwidth is maintained widely on the order of 120MHz.
  • FIG. 13 is a graph illustrating the standing-wave ratio with respect to the frequency of the microstrip antenna according to the present invention, in which the maximum standing-wave ratio to the resonance impedance of 50 ⁇ in a frequency band of personal communication service is 1:1.06 to 1.76.
  • the standing-wave ratio is 1 in the microstrip antenna
  • the standing-wave ratio is 1.768 and the frequency is 1.75000GHz
  • the standing-wave ratio is 1.1613 and the frequency is 1.78000GHz
  • the standing-wave ratio is 1.4269 and the frequency is 1.84000GHz
  • the standing-wave ratio is 1.80664 and the frequency is 1.87000GHz. Accordingly, the standing-wave ratio to the resonance impedance of 50 ⁇ in the bandwidth of 0.12GHz is preferably realized.
  • the gain of the microstrip antenna 100 of the present invention should be effectively achieved for the transmission/reception with the base station or the relay station.
  • a gain of 0.5 to 1.3dB is obtained in all directions.
  • FIG. 14 is a Smith chart explaining the microstrip antenna according to the present invention.
  • the resonance impedance is 50 ⁇ in the frequency band of the personal communication service
  • the impedance is 33.660 ⁇ and the frequency is 1.75000GHz
  • the impedance is 44.160 ⁇ and the frequency is 1.78000GHz
  • at marker 3 the impedance is 59.616 ⁇ and the frequency is 1.84000GHz
  • at marker 4 the impedance is 47.846 ⁇ and the frequency is 1.87000GHz.
  • the resonance impedance in the bandwidth of 0.12GHz is realized in a range of 34 to 60 ⁇ , and, in particular, the resonance impedance in the markers 1 and 2 is nearly 50 ⁇ .
  • FIG. 15 is a view of the radiation pattern explaining the microstrip antenna according to the present invention.
  • the microstrip antenna according to the present invention realizes an omni-direction pattern as shown in FIG. 15, thereby solving the directional problem.
  • Y axis shows an amplitude value as dB
  • a line A shows 1.74GHz
  • a line B shows 1.78GHz
  • a line C shows 1.8GHz
  • a line D shows 1.84GHz
  • a line E shows 1.87GHz
  • the left radiation patch 61 and the right radiation patch 62 are divided by the radiation slot 70 to cause the entire radiation patch to have an electric field of the same phase, it is possible to solve the low reception sensitivity.
  • the microstrip antenna 100 has a gain which is increased by 1 to 1.76 dB on the capacity-loaded side relative to the ground patch 40, and has a radiation pattern with a maximum electric field of 2dB larger than that of the prior dipole antenna, so that it can be effectively used as an antenna for bands of PCS services
  • the thickness H1 of the dielectric 50 and the width of the capacity-loaded side can be adjusted to increase or reduce its bandwidth gain, and the feed point of the feed line 30 can be variably adjusted to eliminate occurrence of a fringe effect at the feed point of the feed line, thereby effectively overcoming the indefinite distribution of the feed line.
  • the microstrip antenna 100 of the present invention can have a radiation pattern of larger gain.
  • the microstrip antenna of the present invention is used as a transmission/reception antenna of a flying object such as a rocket, missile, airplane, etc., and may be designed on the substrate together with solid-state modules such as an oscillator, amplifying circuit, variable attenuator, switch, modulator, mixer, phase shifter, etc. Additionally, the microstrip antenna is used for a personal mobile communication service using a cellular phone and personal communication service, a wireless local looped service, future public land mobile telecommunication system, and variable wireless communication comprising satellite communication to transmit and receive the signal between the base station and the mobile terminal.
  • solid-state modules such as an oscillator, amplifying circuit, variable attenuator, switch, modulator, mixer, phase shifter, etc.
  • the microstrip antenna is used for a personal mobile communication service using a cellular phone and personal communication service, a wireless local looped service, future public land mobile telecommunication system, and variable wireless communication comprising satellite communication to transmit and receive the signal between the base station and the mobile terminal.

Claims (4)

  1. Antenne microruban (100), comprenant un élément diélectrique (50) pris en sandwich entre un agencement (61, 62) de blocs de radiation et un bloc (40) à la masse, le bloc (40) à la masse comportant une première et une deuxième plaques de masse (43, 41) connectées par une plaque en pont (42), l'agencement (61, 62) de blocs de radiation comprenant :
    un premier bloc (61) de radiation, connecté à la première plaque de masse (43), et un deuxième bloc (62) de radiation, connecté à la deuxième plaque de masse (41), agencés de manière à former une fente de radiation entre les premier et deuxième blocs (61, 62) de radiation ; et comprenant en outre une ligne d'alimentation connectée à l'un des blocs (61, 62) de radiation
    caractérisée en ce que
    la largeur (W2) de la plaque en pont (42) est inférieure à la largeur des première et deuxième plaques de masse (W1).
  2. Antenne microruban selon la revendication 1, dans laquelle la deuxième plaque de masse (41) est sensiblement triangulaire, les sommets du triangle étant définis par les coins respectifs de l'élément diélectrique (50) où la deuxième plaque de masse (41) est connectée au deuxième bloc (62) de radiation et à une extrémité de la plaque en pont (42).
  3. Antenne microruban selon la revendication 1 ou 2, comprenant en outre une pièce de montage (80) ayant une forme recourbée et fixée au niveau d'une partie centrale d'une extrémité du premier bloc (61) de radiation opposé au deuxième bloc (62) de radiation, une surface latérale du diélectrique (50) et la première plaque de masse (43) pour obtenir une hauteur (H2) permettant au bloc (40) à la masse d'être monté séparément.
  4. Antenne microruban selon l'une quelconque des revendications précédentes, dans laquelle la longueur de la plaque en pont (42) est supérieure ou égale à la longueur (15) de la deuxième plaque de masse (41).
EP00304669A 2000-04-17 2000-06-01 Antenne microruban Expired - Lifetime EP1148581B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
KR0019972 2000-04-17
KR1020000019972A KR100349422B1 (ko) 2000-04-17 2000-04-17 마이크로스트립 안테나
KR2000019972 2000-04-17

Publications (2)

Publication Number Publication Date
EP1148581A1 EP1148581A1 (fr) 2001-10-24
EP1148581B1 true EP1148581B1 (fr) 2004-12-08

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EP00304669A Expired - Lifetime EP1148581B1 (fr) 2000-04-17 2000-06-01 Antenne microruban

Country Status (6)

Country Link
EP (1) EP1148581B1 (fr)
JP (1) JP2001313518A (fr)
KR (1) KR100349422B1 (fr)
CN (1) CN1134858C (fr)
AT (1) ATE284573T1 (fr)
DE (1) DE60016565D1 (fr)

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US7932870B2 (en) 1999-10-26 2011-04-26 Fractus, S.A. Interlaced multiband antenna arrays
US8009111B2 (en) 1999-09-20 2011-08-30 Fractus, S.A. Multilevel antennae
US8207893B2 (en) 2000-01-19 2012-06-26 Fractus, S.A. Space-filling miniature antennas
US8786499B2 (en) 2005-10-03 2014-07-22 Pulse Finland Oy Multiband antenna system and methods
US9099773B2 (en) 2006-07-18 2015-08-04 Fractus, S.A. Multiple-body-configuration multimedia and smartphone multifunction wireless devices

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JP2002344231A (ja) * 2001-04-17 2002-11-29 Samsung Electronics Co Ltd 板状逆ｆアンテナ
RU2303843C2 (ru) 2001-09-13 2007-07-27 Фрактус, С.А. Многоуровневый и заполняющий пространство противовес для миниатюрных и многополосных антенн и антенное устройство
EP1837950A3 (fr) * 2001-09-13 2007-10-17 Fractus, S.A. Aléseuse à plusieurs niveaux et compacte pour antennes miniatures et multibandes
US9755314B2 (en) 2001-10-16 2017-09-05 Fractus S.A. Loaded antenna
KR100477278B1 (ko) * 2002-05-15 2005-03-22 (주) 코산아이엔티 마이크로스트립 듀얼밴드 안테나
FR2841046B1 (fr) * 2002-06-17 2006-06-16 France Telecom Antenne pastille compacte avec un moyen d'adaptation
EP1516388A1 (fr) 2002-06-25 2005-03-23 Fractus, S.A. Antenne multibande pour terminal portable
EP1586134A1 (fr) 2003-01-24 2005-10-19 Fractus, S.A. Antennes a plaques en microruban tres directives a rayonnement transversal
US7928915B2 (en) 2004-09-21 2011-04-19 Fractus, S.A. Multilevel ground-plane for a mobile device
EP1859507A4 (fr) * 2005-03-16 2012-08-15 Lk Products Oy Composant d antenne
US8378892B2 (en) 2005-03-16 2013-02-19 Pulse Finland Oy Antenna component and methods
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US10892557B1 (en) * 2019-06-19 2021-01-12 Ambit Microsystems (Shanghai) Ltd. Antenna structure and intelligent household appliance using the same
CN111313151B (zh) * 2019-11-13 2022-04-12 湖北三江航天险峰电子信息有限公司 一种小型超宽带异面镜像偶极子阵列天线
CN111273274B (zh) * 2020-03-12 2022-03-18 四川九洲电器集团有限责任公司 多基协同定位方法、存储介质、雷达及雷达定位系统
CN113571912B (zh) * 2021-06-21 2022-07-12 西安电子科技大学 一种机载超短波天线

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US8154462B2 (en) 1999-09-20 2012-04-10 Fractus, S.A. Multilevel antennae
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US8212726B2 (en) 2000-01-19 2012-07-03 Fractus, Sa Space-filling miniature antennas
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US9099773B2 (en) 2006-07-18 2015-08-04 Fractus, S.A. Multiple-body-configuration multimedia and smartphone multifunction wireless devices

Also Published As

Publication number Publication date
KR100349422B1 (ko) 2002-08-22
KR20010096062A (ko) 2001-11-07
DE60016565D1 (de) 2005-01-13
CN1134858C (zh) 2004-01-14
CN1318880A (zh) 2001-10-24
ATE284573T1 (de) 2004-12-15
EP1148581A1 (fr) 2001-10-24
JP2001313518A (ja) 2001-11-09

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