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WO2002007255A1 - Antenne plane pour portables - Google Patents

Antenne plane pour portables Download PDF

Info

Publication number
WO2002007255A1
WO2002007255A1 PCT/KR2001/000989 KR0100989W WO0207255A1 WO 2002007255 A1 WO2002007255 A1 WO 2002007255A1 KR 0100989 W KR0100989 W KR 0100989W WO 0207255 A1 WO0207255 A1 WO 0207255A1
Authority
WO
WIPO (PCT)
Prior art keywords
patch antenna
feeding
internal patch
substrate
antenna
Prior art date
Application number
PCT/KR2001/000989
Other languages
English (en)
Inventor
Jeong-Kun Oh
Kyung-Min Lee
Duk-Jae Park
Byoung-Nam Kim
Chang-Gyu Choi
Original Assignee
Ace Technology
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 Ace Technology filed Critical Ace Technology
Publication of WO2002007255A1 publication Critical patent/WO2002007255A1/fr

Links

Classifications

    • 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
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/12—Supports; Mounting means
    • H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
    • H01Q1/24—Supports; Mounting means by structural association with other equipment or articles with receiving set
    • 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
    • H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
    • H01Q1/24—Supports; Mounting means by structural association with other equipment or articles with receiving set
    • H01Q1/241—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM
    • H01Q1/242—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for hand-held use
    • H01Q1/243—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for hand-held use with built-in antennas
    • 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
    • H01Q5/378—Combination of fed elements with parasitic elements
    • 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
    • H01Q5/40—Imbricated or interleaved structures; Combined or electromagnetically coupled arrangements, e.g. comprising two or more non-connected fed 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
    • H01Q9/0407—Substantially flat resonant element parallel to ground plane, e.g. patch antenna
    • H01Q9/045—Substantially flat resonant element parallel to ground plane, e.g. patch antenna with particular feeding means
    • H01Q9/0457—Substantially flat resonant element parallel to ground plane, e.g. patch antenna with particular feeding means electromagnetically coupled to the feed line

Definitions

  • the present invention relates to an antenna used in a portable terminal such as a
  • portable phone and, more particularly, to an internal antenna which is mounted inside the terminal by a surface mounting technology.
  • Conventional antennas for portable phones includes a whip antenna comprising of
  • a straight metallic antenna rod a helical antenna comprising of a helically wound antenna element, and a retractable antenna including the whip antenna and the helical antenna so that the helical antenna operates when the whip antenna is in a retracted position while the
  • whip antenna operates when it is in an extended position. Since all the antennas are
  • the antenna Being exposed to the outside of the phone, the conventional antenna
  • antenna internal antennas which may be installed inside the phone by surface mounting
  • the bandwidth of the internal antenna is generally proportional to the thickness of the dielectric substrate. That is, the thinner the dielectric substrate.
  • the bandwidth may be insufficient for facilitating signal transmission and reception due to the reduction of the size of the antenna.
  • an object of the present invention is to provide an internal patch antenna which has sufficiently wide bandwidth and can be installed easily by the surface mounting technology.
  • the internal patch antenna of the present invention includes a substrate, a dielectric layer, a ground plane, and a feeding microstrip transmission line.
  • the dielectric layer made of
  • ceramic material having high dielectric constant is formed on the substrate and has multiple radiator patterns for transmitting and receiving the signals on its upper side.
  • ground plane is disposed beneath the substrate.
  • the feeding microstrip is inserted between
  • the substrate and the dielectric layer to feed electrical signals to the radiator patterns by
  • the feeding microstrip preferably runs through the center
  • the radiator patterns may be arranged asymmetrically between the region above the feeding microstrip and the other
  • the feeding microstrip includes a feeding point connected to the via hole; a main feeding portion connected electrically to the feeding point; and a termination portion which terminates the feeding microstrip. Additionally, multiple microstrip patches having
  • rectangular shapes are arranged of series along the main feeding portion.
  • the internal patch antenna further includes a waveguide which connects the feeding point to a main feeding portion.
  • the width of the main feeding portion is narrower than the width of a common
  • microstrip transmission line of 50 ohm ( ⁇ ).
  • the waveguide part and the termination portion may have the same width as the common microstrip transmission line
  • the first and the second impedance matching portion may be
  • the feeding microstrip line may include portion bent into
  • a plurality of screw holes are formed on the ground plane, so
  • the ground plane is attached to a ground line of a circuit board of the portable terminal by screwing into the screw holes.
  • the ground plane may be
  • microstrip transmission line and adjust the arrangement to combine adjacent modes and wide operation bandwidth.
  • FIGS. 1A and FIG. IB illustrate an example of a portable phone which employs an internal patch antenna according to the present invention
  • FIG. 2 is a perspective view of an embodiment of the internal patch antenna
  • FIG. 3 is an exploded perspective view of the internal patch antenna of FIG. 2;
  • FIG. 4 shows the radiator patterns of the internal patch antenna of FIG. 2 in detail
  • FIG. 5 shows the feeding microstrip of the internal patch antenna of FIG. 2 in
  • FIG. 6 shows the radiator patterns overlapped with the feeding microstrip
  • FIG. 7 is a plot of standing- wave ratio of the internal patch antenna of FIG. 2;
  • FIGS. 8 A through 8C are radiation pattern diagrams of the internal patch antenna
  • FIG. 9 is a perspective view of another embodiment of the internal patch antenna according to the present invention.
  • FIG. 10 is a exploded perspective view of an internal patch antenna of FIG. 9;
  • FIG. 11 is a plot of standing-wave ratio of the internal patch antenna of FIG. 9;
  • FIGS. 12 A and 12B are radiation pattern diagrams of the internal patch antenna of
  • FIG. 9 in a first and a second frequency band, respectively.
  • FIGS. 1 A and FIG. IB illustrate an example of a portable phone which employs an internal patch antenna according to the present invention.
  • the patch antenna 10 is installed on a main circuit board 4 inside the portable phone 2.
  • a ground plane of the patch antenna 10 directly contacts the ground line of the circuit board 4 and the antenna radiator is fed from a signal line of the circuit board 4.
  • ⁇ (phi) denotes the azimuth, for measuring radiation patterns of the antenna described below, with reference to the feeding point of the antenna.
  • the patch antenna 10 has a size of 27X 27X 4.5 square millimeters (mm 3 ) and occupies just a little volume in the phone 2.
  • a folder-type phone is illustrated in Fig.l, it is obvious that the patch antenna of the present invention can be employed in the other kinds of portable terminals such as a flip-type and a bar-type phone, and a personal digital assistant (PDA).
  • PDA personal digital assistant
  • FIGS. 2 and 3 illustrate an embodiment of the internal patch antenna according to the present invention in detail.
  • the internal patch antenna 10 according to the present embodiment includes a substrate 60 made of plastic, e.g., glass epoxy (FR-4), a ground plane 70 installed beneath the lower surface of the substrate 60, and a dielectric layer 30 deposited on the upper surface of the substrate 60.
  • a conductive layer 20 for radiating and receiving electromagnetic wave.
  • a feeding microstrip which transmits and receives signals to and from the conductive layer 20 by electromagnetic coupling, is disposed between the dielectric layer 30 and the substrate 60.
  • the feeding microstrip is electrically connected to a signal line of the main circuit board 4 through a via hole formed through the ground plane.
  • the conductive layer 20 is comprised of multiple radiator patterns.
  • the radiator patterns are shown in more detail in FIG. 4.
  • a first pattern 22 having the largest size is disposed in the center of the conductive layer 20.
  • Eight second patterns 24 scaled down by 1/9 from the first pattern 22 are disposed radially around the first pattern 22.
  • Eight third patterns 26 scaled down by 1/9 from the second pattern 24 are disposed around each of the second pattern 24.
  • Multiple fourth patterns 28 scaled down further are disposed around the second pattern 24 above the path of the feeding microstrip 40, so that the perturbation is increased in the region where the electromagnetic coupling occurs from the feeding microstrip transmission line to result in
  • the radiator patterns arranged as above has a property of a kind of an array antenna.
  • the size of each of the first through the fourth patterns 22 - 28 and distances therebetween are determined so as to widen the operation bandwidth and insure plural resonance frequencies by autocorrelation while enhancing reliability for antenna duplication.
  • the specific dimension is determined according to the overall size of the antenna and material of each member, and can be optimized depending on the application.
  • the radiator patterns exchange signals with the microstrip transmission line by electromagnetic coupling.
  • ceramic of high dielectric constant e.g. 80-120 for the dielectric layer 30.
  • Use of multiple radiating patterns mentioned above contribute to the enhancement of the coupling efficiency as well. Since the internal patch antenna of the present invention basically uses resonance characteristics, the operation frequency band can be adjusted by changing dielectric material. On the other hand, if the coupling efficiency is increased, the bandwidth of the antenna is widened also.
  • FIG. 5 shows the feeding microstrip in the internal patch antenna.
  • the feeding microstrip 40 includes a waveguide 44, a main feeding portion 48, and a termination portion 54.
  • the signal feeding operation for the radiator patterns 22 - 28 of the conductive layer 20 is mainly carried out by the main feeding portion 48.
  • the waveguide 44 provides a high frequency signal from the feeding point 42 to the main feeding portion 48 and the termination portion 54 terminates the feeding microstrip 40.
  • FIG. 6 shows the radiator patterns overlapped with the feeding microstrip. Meanwhile, the feeding microstrip 40 is connected to the main circuit board of the phone through a via hole adjacent to the feeding point.
  • the feeding microstrip transmission line is not exposed to air and but buried between the plastic substrate and the ceramic dielectric layer, the high frequency signal propagating through the microstrip transmission line is influenced by the ceramic.
  • the equivalent capacitance is increased compared with the case that the microstrip transmission line is exposed to air and the characteristic impedance is less than 50 ohm ( ⁇ ). Therefore, it is preferable that the line bandwidth of the main feeding portion 48 is less than that of a common microstrip transmission line having a characteristic impedance of 50 ohm ( ⁇ ) for the purpose of impedance matching.
  • the specific width of the main feeding portion 48 can be optimized by a simulation.
  • first transition portion 46 between the waveguide 44 and the main feeding portion 48, having a taped aspect of which line width diminishes gradually, so that impedance is matched in this region.
  • second transition portion 52 between the main feeding portion 48 and the termination portion 54,
  • microstrip patches 50 are arranged in series along the main feeding portion 48 so as to provide electrical signal efficiently to the radiator patterns and obtain wide bandwidth characteristic and effective mode coupling through the interferences
  • the total length of the feeding microstrip 40 is closely related to the resonance frequency of the antenna.
  • the waveguide 44 or the termination portion is preferably bent into a 'L'-shape or 'U'-shape so that the feeding microstrip is implemented effectively in a limited area while maintaining required length. It can be seen that the waveguide 44 is bent into the 'U'-shape in the embodiment of FIG. 5.
  • the electrical length of the waveguide 44 is 0.072 ⁇ 0
  • the electrical length of the main feeding portion 48 is 0.063 ⁇ 0
  • the electric length of the termination portion 54 is 0.043 ⁇ 0 .
  • the ground plane 70 includes four screw holes for putting screws in the vicinity of four corners.
  • the antenna may be installed solidly on the main circuit board of the phone while guaranteeing the ground state of the ground plane 70 by driving screws into the screw holes in a state that the ground plane 70 is closely stuck to the main circuit board.
  • the region 74 of the ground plane 70 near the via hole of the substrate 60 for feeding power to the feeding microstrip 40 is incised and partially filled with, or made of, non-conductive material for the insulation between the conductive material filled in the via hole and the ground plane 70.
  • the ground plane 70 can be fixed to the main circuit board of the
  • FIG. 7 shows the standing- wave ratio of the internal patch antenna according to the present embodiment.
  • the internal patch antenna shows excellent standing- wave ratio
  • the frequency bands of 900 MHz, 1.8 GHz, and 2.1 GHz correspond to bands for the Group Special Mobile (GSM) system, the Personal
  • embodiment can be employed in any terminal suitable for one of the three systems without any adaptation process.
  • FIGS. 8A through 8C show radiation patterns of the internal patch antenna of FIG.
  • the three-dimensional radiation pattern has a
  • FIGS. 9 and 10 illustrates another embodiment of the internal patch antenna
  • the antenna of the present embodiment is resonated in dual frequency bands of 1.8 GHz and 2.1 GHz, and has the size of is 20 x 10 x 4.5
  • the antenna shown in FIGS. 9 and 10 has a similar structure to that shown in
  • the antenna of the present embodiment includes a conductive layer 120 comprising of multiple radiator patterns, a dielectric layer 130, a feeding microstrip 160, and a ground plane 170. It can be said that the antenna of FIGS. 9 and 10 is a miniature of that shown in FIGS. 2 and 3 maintaining electric characteristics of the latter. In the present embodiment, however, the termination portion of the feeding microstrip transmission line 160 is bent into a 'L' -shaped pattern to reduce the area of the feeding microstrip transmission line 160. Further, the lateral radiator patterns in FIGS. 2 and 3 are removed while the patterns above the feeding microstrip transmission line 160 are maintained, so that the size of the antenna is reduced. That is, the first pattern is disposed on the center of the dielectric layer 130, and the second and the third patterns are disposed only on the region the dielectric layer 130 above the feeding microstrip line.
  • FIGS. 11 through 12B show electric characteristics of a dual band internal patch antenna according to the present embodiment. Specifically, FIG. 11 shows standing-wave ratio of the internal patch antenna of FIG. 9, and FIGS. 12A and 12B show radiation patterns in a first and a second frequency band, respectively. Comparing FIGS. 11 through 12B with FIGS. 7 through 8C, it can be seen that the antenna of the present embodiment shows similar electric characteristics to the antenna of FIGS. 2 and 3. -
  • the multiple band internal patch antenna of the present invention can be installed on the main circuit board of the portable terminal, and thus can enables the terminal manufacturer to increase the productivity of the terminals.
  • the present invention increases the reproducibility of the antenna and thus facilitates mass production of the antenna and portable terminal.
  • the present invention can effectively solve the space problem of the conventional antenna. Since some portion of the electromagnetic wave radiated from the antenna is shielded by the ground plane of the antenna and the circuit board of the terminal, electromagnetic interference exposed to the human body is reduced compared with the conventional omnidirectional antenna. Since the antenna of the present invention can operate in multiple frequency bands, the terminal manufacturer can employ the same antenna for various kinds of terminals.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Waveguide Aerials (AREA)
  • Details Of Aerials (AREA)

Abstract

L'invention porte sur une antenne plane présentant une largeur de bande suffisante et de taille suffisamment réduite pour être montée dans un téléphone portable selon la technique du montage de surface. Ladite antenne émettrice/réceptrice de signaux sans fil, comporte: un substrat (60), une couche diélectrique (30), une plaque de masse (70), et un conducteur microruban (60) d'alimentation. La couche diélectrique (30) formée sur le substrat (60) est faite d'un matériau céramique à constante diélectrique élevée. Une couche conductrice (20) comportant le via (28) des motifs (22) de radiateurs est formée sur la couche diélectrique (30). La plaque de masse (70) est disposée sous le substrat. Le microruban (60) d'alimentation, intercalé entre le substrat (60) et la couche diélectrique (30), fournit par couplage électromagnétique des signaux électriques au via (28) des motifs (22) de radiateurs. Les motifs des radiateurs peuvent être disposés asymétriquement entre la zone située au-dessus de la zone des microrubans et les autres zones.
PCT/KR2001/000989 2000-06-09 2001-06-09 Antenne plane pour portables WO2002007255A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR2000/31872 2000-06-09
KR1020000031872A KR20010111334A (ko) 2000-06-09 2000-06-09 다중대역 세라믹 내장형 안테나

Publications (1)

Publication Number Publication Date
WO2002007255A1 true WO2002007255A1 (fr) 2002-01-24

Family

ID=19671585

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/KR2001/000989 WO2002007255A1 (fr) 2000-06-09 2001-06-09 Antenne plane pour portables

Country Status (2)

Country Link
KR (1) KR20010111334A (fr)
WO (1) WO2002007255A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1953867A1 (fr) * 2007-01-31 2008-08-06 Fujitsu Ltd. Étiquette RFID
CN103762425A (zh) * 2013-11-04 2014-04-30 航天恒星科技有限公司 一种用于二维相控扫描的双频双圆极化共口径天线阵
WO2018124868A1 (fr) * 2016-12-30 2018-07-05 Université Mohammed 5 Rabat Titre : antenne microbande à fort gain pour les systèmes radars opérant dans la bande

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5008681A (en) * 1989-04-03 1991-04-16 Raytheon Company Microstrip antenna with parasitic elements
US5355143A (en) * 1991-03-06 1994-10-11 Huber & Suhner Ag, Kabel-, Kautschuk-, Kunststoffwerke Enhanced performance aperture-coupled planar antenna array
US5933115A (en) * 1997-06-06 1999-08-03 Motorola, Inc. Planar antenna with patch radiators for wide bandwidth

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5008681A (en) * 1989-04-03 1991-04-16 Raytheon Company Microstrip antenna with parasitic elements
US5355143A (en) * 1991-03-06 1994-10-11 Huber & Suhner Ag, Kabel-, Kautschuk-, Kunststoffwerke Enhanced performance aperture-coupled planar antenna array
US5933115A (en) * 1997-06-06 1999-08-03 Motorola, Inc. Planar antenna with patch radiators for wide bandwidth

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
TAE-HOON YOO: "Broadband microstrip patch antenna for IMT-200", IEEE ANTENNAS AND PROPAGATION SOCIETY INTERNATIONAL SYMPOSIUM, 16 July 2000 (2000-07-16) *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1953867A1 (fr) * 2007-01-31 2008-08-06 Fujitsu Ltd. Étiquette RFID
US8068057B2 (en) 2007-01-31 2011-11-29 Fujitsu Limited RFID tag
CN103762425A (zh) * 2013-11-04 2014-04-30 航天恒星科技有限公司 一种用于二维相控扫描的双频双圆极化共口径天线阵
WO2018124868A1 (fr) * 2016-12-30 2018-07-05 Université Mohammed 5 Rabat Titre : antenne microbande à fort gain pour les systèmes radars opérant dans la bande

Also Published As

Publication number Publication date
KR20010111334A (ko) 2001-12-17

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