WO2005091436A1 - 折返しアンテナ - Google Patents
折返しアンテナ Download PDFInfo
- Publication number
- WO2005091436A1 WO2005091436A1 PCT/JP2005/004793 JP2005004793W WO2005091436A1 WO 2005091436 A1 WO2005091436 A1 WO 2005091436A1 JP 2005004793 W JP2005004793 W JP 2005004793W WO 2005091436 A1 WO2005091436 A1 WO 2005091436A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- folded
- antenna
- ground conductor
- conductor film
- frequency
- Prior art date
Links
Classifications
-
- 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
- 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
- H01Q1/2283—Supports; Mounting means by structural association with other equipment or articles mounted in or on the surface of a semiconductor substrate as a chip-type antenna or integrated with other components into an IC package
-
- 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
- H01Q13/00—Waveguide horns or mouths; Slot antennas; Leaky-waveguide antennas; Equivalent structures causing radiation along the transmission path of a guided wave
- H01Q13/20—Non-resonant leaky-waveguide or transmission-line antennas; Equivalent structures causing radiation along the transmission path of a guided wave
- H01Q13/206—Microstrip transmission line 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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
- H01Q5/30—Arrangements for providing operation on different wavebands
- H01Q5/307—Individual or coupled radiating elements, each element being fed in an unspecified way
- H01Q5/342—Individual or coupled radiating elements, each element being fed in an unspecified way for different propagation modes
- H01Q5/357—Individual or coupled radiating elements, each element being fed in an unspecified way for different propagation modes using a single feed point
-
- 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 a small, high-performance antenna that can transmit and receive signals in two or more frequency bands suitable for use in, for example, a wireless LAN (Local Area Network), and has a wide bandwidth.
- a wireless LAN Local Area Network
- the background art related to a small antenna having a bandwidth of about 1 GHz in two frequency bands, for example, 2.4 GHz and 5 GHz, and a force of 5 GHz band.
- a folded antenna 50 as shown in FIG. 10 has been considered as an antenna suitable for transmitting and receiving signals in two or more frequency bands having a relationship of about twice (for example, FIG. 10).
- Patent Document 1 By adjusting the interval between the adjacent elements 51 in the folded antenna 50, the frequency to be resonated can be adjusted, and it is known that resonation can be performed even in two frequency bands that are almost doubled.
- Such an antenna is formed, for example, on the surface of a strong cylindrical body such as a dielectric, and is mounted on the top of the housing as an antenna for a mobile phone.
- the antenna element 51 is connected to the housing of the mobile phone or the like as a ground plane 52. It is used by arranging it with the ground (base plate) 52 at a fixed interval h.
- Patent document 1 JP-A-10-13135
- the antenna having the above-described structure if the distance h (see FIG. 10) between the bottom surface of the antenna element 51 and the ground plane 52 is too short, the input impedance of the antenna decreases, and desired characteristics cannot be obtained. However, it is necessary to provide the housing with a sufficient distance h so as to increase the distance h, so that the requirement for miniaturization of the device cannot be fulfilled.In addition, especially when the resonance is performed in two or more frequency bands, when the distance h is small, both There is a problem that it is difficult to adjust the impedance with respect to the frequency.
- the bandwidth power of 100MHz in the 2.4GHz band is about 1GHz in the 5GHz band. With a bandwidth of 5-6 GHz.
- the present invention has been made in view of such a situation, and has a resonance in two or more frequency bands such as 2.4 GHz and 5 GHz, and has a bandwidth of about 1 GHz such as 5 GHz to 6 GHz.
- An object of the present invention is to provide a folded antenna capable of realizing a wideband antenna with a single antenna.
- Another object of the present invention is to satisfy impedance ⁇ resonance frequency only by adjusting the width of the folded portion and the element and the interval between the elements without much affecting the impedance adjustment of the antenna with the relation to the ground plane.
- the present inventors have conducted intensive studies to obtain an antenna having a bandwidth of 5 to 6 GHz, which can be used in the two frequency bands of 2.4 GHz and 5 GHz as required for today's wireless LAN described above.
- the antenna element is turned back in a direction parallel to one surface of the ground plane (perpendicular to the direction in which the antenna element mainly extends), that is, a ground conductor film (ground plane) perpendicular to the element on the feeder side.
- the element length in the direction parallel to the ground conductor film is made longer as the power of the power supply unit increases, and then the element length between each folded part and the spacing between adjacent elements are adjusted.
- the resonance frequency can be adjusted.
- the resonance between the two resonance frequencies can be substantially caused. It can, 1GH As a result, an antenna having a bandwidth as large as z was obtained, and an antenna satisfying the above-mentioned conditions required for the wireless LAN was realized.
- a plurality of folded portions are formed by being folded in a zigzag manner in a direction parallel to the one surface of the ground plate while extending in a direction perpendicular to one surface of the ground plate. And the element between the folded portions or the adjacent two elements of the same length. The length of one set of elements.
- the antenna element is shorter on the base plate side and longer as the base plate is separated from the base plate. Are formed, and two or more elements having the same frequency are adjusted by adjusting the length of each set of elements between the folded portions or adjacent two elements of the same length and the distance between adjacent elements.
- the antenna element is resonated in the band so that the first frequency band has a specific bandwidth of 4% or more of the frequency and the second frequency band has a specific bandwidth of 15% or more of the frequency.
- a return portion is formed.
- the fractional bandwidth is the ratio ( ⁇ ) of the bandwidth ( ⁇ ) to the center frequency (f).
- one surface of the ground plane means a main plane or an end face of the ground plane closest to the feeding part of the antenna.
- the antenna element and the ground plane are formed on the dielectric substrate surface by the conductor.
- it When formed side by side with a film, it means the plane in the thickness direction of the ground conductor film at the end of the ground conductor film closest to the feeding part of the antenna element.
- the antenna element is formed of a conductive film on at least one surface of or inside a dielectric substrate, and a ground conductor film that can be grounded on one side surface perpendicular to the one surface of the dielectric substrate. Is provided as one surface of the ground plane, and the ground conductor film is provided. One end of the antenna element is provided on the side surface so as not to contact the ground conductor film, and the one end of the antenna element is provided.
- the force-extending element extends on the one surface in a direction perpendicular to the one side surface, and is then bent so that the one side surface is parallel to one side intersecting with the one surface, and a plurality of the plurality of the elements extend in a direction away from the one-side force.
- the folded part The structure to be formed can be.
- the distance between the first element closest to the ground conductor film and the ground conductor film among the elements parallel to the one side is 0.8 to lmm, and the first element
- the length of the element is 4 to 4.5 mm, and the length of the element parallel to the one side or the element set and the element adjacent thereto becomes longer as the distance from the ground conductor film increases so as to be 1.05 to 2 times. Formed.
- the folded portion is provided in a direction in which one end side of the antenna element extends in a direction perpendicular to one surface of the base plate at the same angle as the center line with respect to the center line. Even if one folded portion exists on the center line or on a line parallel to the center line separated by a certain distance from the center line force, and the other folded portion is provided in a direction in which the center line sequentially spreads to only one side with respect to the center line. Good.
- the ground conductor film is formed to extend to the one surface side of the dielectric base, so that the ground conductor film is affected by other components disposed on a circuit board or a hand of a user of a mobile phone, for example. Can be reduced.
- the antenna element close to the ground plane becomes longer as the distance from the ground plane becomes shorter, so that the capacitance between the ground plane and the antenna element is very small, and the effect on the input impedance of the antenna is small. small.
- the resonance frequency can be changed by sequentially changing the length of the element.For example, the two resonance frequencies in the high frequency band can be extremely changed while the low frequency band is close to the desired frequency band. The two resonance frequencies can be used as a resonance state.
- antennas have been obtained that can transmit and receive a single signal in two high-frequency bands with a wide bandwidth in remote high-frequency bands such as 2.4-2.5 GHz and 5-6 GHz. When it is done, it has an effect.
- FIG. 1A and FIG. 1B are explanatory views of an embodiment of a folded antenna according to the present invention
- FIG. 4 is an explanatory diagram of a state where the light emitting device is attached to a substrate.
- FIGS. 2A and 2B are diagrams showing return loss characteristics with respect to frequency of the antenna of FIG. 1 in comparison with return loss characteristics of an antenna folded back with the same element length.
- 3A to 3E are diagrams illustrating that the impedance and frequency of the folded antenna shown in FIG. 1 can be changed.
- FIG. 4 is a view showing an example similar to FIG. 1B, in which the antenna is mounted upside down on a substrate.
- FIG. 5A and FIG. 5B are diagrams showing examples in which an antenna element is built in a base.
- FIG. 6 is a diagram showing another pattern example of the folded antenna.
- FIG. 7 is a diagram showing another pattern example of the folded antenna.
- FIG. 8 is a diagram showing another pattern example of the folded antenna.
- FIG. 9 is a diagram showing another pattern example of the folded antenna.
- FIG. 10 is a diagram showing a structural example of a conventional folded antenna.
- a folded antenna according to an embodiment of the present invention extends in a direction perpendicular to one surface (ground conductor film) 2 of the Are folded in a zigzag shape in a direction parallel to the vertical direction (perpendicular to the direction extending in the vertical direction) to form a plurality of folded portions 13, 15, 17, and the folded portions 13, 15, 17
- the length of the intervening element (1st element 12, 2nd element 14 and 3rd element 16, and 4th element 18) is short on the ground conductor film 2 side (power supply end 4 side).
- the antenna element 1 is formed so as to increase as the distance from the membrane 2 increases. This element Regarding the relationship between element lengths, adjacent elements with the same length, such as the second element 14 and the third element 16, are treated as a single element set.
- the length L of each element 12, 14, 16, 18 between the folded portions are treated as a single element set.
- the folded part of the antenna element 1 is formed to have a specific bandwidth of 4% or more of the frequency in the wavenumber band and a specific bandwidth of 15% or more of the frequency in the second frequency band. is there.
- the antenna element 1 is formed on the surface of a dielectric substrate 3 such as a ceramic, and the dielectric substrate 3 has a length (M) ⁇ a width (W) ⁇ a thickness (t ) Is about 7mm X 8mm X 0.9mm and is made of ceramics with relative permittivity of 20 and is formed as an antenna for wireless LAN used in two frequency bands of 2.4-2.5GHz band and 516GHz band. ing .
- this antenna element 1 is not provided on the surface of the dielectric substrate 3 as shown in FIG. 1, for example, a part or the whole of the antenna element is formed on the surface of the dielectric film, and together with the other dielectric films.
- a part or the whole may be formed inside the dielectric substrate 3 by laminating and sintering or bonding a dielectric substrate, or may be formed by folding the antenna element into space. May be formed on the surface of a cylindrical or cylindrical dielectric, or may be formed by rolling an antenna element formed on a flexible dielectric film into a cylindrical shape. May be. The point is that the antenna element 1 is folded back multiple times in a direction parallel to one surface of the ground plane 2 (the direction in which the antenna element mainly extends and the vertical direction), and as the force moves away from the ground plane 2, the parallelism with the ground plane 2 increases. It is only necessary to fold the element length so as to be longer and to form a folded part so as to have a desired bandwidth in a desired frequency band!
- the antenna element 1 is formed by patterning a conductive film formed on a ceramic substrate or the like by sputtering or by forming a wire into a desired pattern by screen printing or the like. May be formed by bending the above metal wire.
- the antenna element 1 is formed by the length L of the element between the folded portions.
- the ground conductor film which is 1 L, becomes the ground plane.
- the resonance frequencies fl, f2, f3, and f4 are adjusted so that the resonance frequencies of f3 and f4 are very close so that they can be used in resonance with f3 and f4, and the resonance frequency
- the number to be almost twice the fl it is possible to use antennas at 2.4-2.5GHz and 5-6GHz.
- an antenna having a length of 1Z4 wavelength has a length of 3Z4 wavelength for three times the frequency, and an odd multiple such as three times, five times, and seven times.
- Related frequencies tend to resonate.
- the present inventors further adjust the folded antenna so that, for example, the resonance frequencies of fl, f2, f3, and f4, which are in any relationship, for example, f3 and f4, are brought very close to each other. It was found that the interval could be one resonance frequency band.
- a folded antenna having a length L and a thickness (width) of p1 and 2 and a spacing d is a combination of the two elements shown in FIGS. 3B and 3C. It can be considered that the current Ir is divided into an even mode in the same direction and an odd mode in the opposite direction If.
- the even mode and the odd mode shown in FIGS. 3B and 3C can be replaced with equivalent circuits shown in FIGS. 3D and 3E when the power supply unit 4 is shared and simplified, respectively.
- Ii is the current supplied to the folded antenna
- Vi is the voltage supplied to the folded antenna
- Ir is the power supplied to the even-mode element when it is decomposed into even and odd modes.
- V is the supply voltage.
- a is related to the connection of the folded portions, and is represented by the following equation (2).
- Equation (3) (1 + af Z r + 2 Z f
- kL 2 ⁇ LZ ⁇ becomes almost constant because the resonant frequency, that is, the wavelength, changes due to the change in the electrical length L due to folding.
- the input impedance of Equations (3) and (1) changes by changing ⁇ , that is, the thickness (width) ⁇ of the antenna element and the folding interval d. It becomes constant, and the input impedance of the equation (4) becomes wider with respect to the resonance frequency.
- FIG. 1 shows the return loss for the frequency of the antenna.
- Figure 2B shows the return loss for the same frequency when the antenna is folded at a fixed length without changing the length of each element between the folded parts. Shown. As is evident from Fig. 2, the desired 2.4-2.5 GHz and 5-6 GHz were obtained by using a gradual antenna with a gradually increasing element length. Therefore, a folded antenna formed with the same length could not obtain resonance at 5-6 GHz.
- the force can be as small as about 2 to 3 mm and 0.8 to lmm.
- the relationship of the element length to be gradually increased is not limited to the above example, and can be adjusted so as to obtain a desired bandwidth and a desired input impedance in a desired frequency band. 1.05—It is possible to gradually change the length about twice as long as 1.5 times.
- the spacing d between the elements is formed not at the same width but at different intervals, so that the frequency adjustment is performed and the width of the element is also changed immediately, so that the resonance frequency can be reduced.
- Easy to adjust In other words, in order to have the above-mentioned frequency relationship and adjust so as to obtain the desired input impedance, it is not necessary to simply use a folded antenna, and the element length between the folded portions is gradually increased as the ground plane force increases. It can be obtained by changing the element width and the interval between adjacent elements with two or more kinds of various values. If the dimensions of the antenna element that can obtain the desired characteristics can be designed, mass production can be performed with the same dimensions.
- the ground conductor film 2 is provided up to the surface of the dielectric substrate 3, but may be provided only on the side surface (bottom surface).
- the folded force is not merely folded, but is parallel to one surface of the ground plate (ground conductor 2) on the power supply unit 4 side (the direction in which the antenna element mainly extends). (In the vertical direction), and the length of each of the folded elements L1 L is successively increased. As a result, between the main plate and the element
- the input impedance can be prevented from lowering, and a desired input impedance can be formed by adjusting the spacing between the above-described elements.
- fl has a bandwidth of 2.4 to 2.5 GHz (approximately 4% fractional bandwidth), and f3 and f4 are very similar.
- an antenna with a bandwidth of about 1 GHz (approximately 18% fractional bandwidth) was realized in the 5 GHz band, which is almost twice f1.
- the antenna 20 is mounted on a substrate 21 incorporated in a wireless LAN, a mobile phone, or the like, for example, as shown in FIG. 1B.
- a ground conductor 22 is provided except for the antenna mounting portion and the power supply wiring 23, and is connected to the ground conductor film 2 of the antenna 20.
- the power supply wiring 23 is connected to the power supply unit 4 of the antenna 20, and the other end is guided to the front side of the substrate 21 and connected to a transmission / reception circuit formed on the front side.
- the ground conductor 22b is also provided on the side surface of the antenna 20, if the distance D is adjusted, the impedance of the antenna 20 can be further adjusted.
- the ground conductor film 2 formed on the side surface of the dielectric substrate 3 corresponds to one surface of the ground plate in relation to the direction in which the antenna extends and one surface of the ground plate. I do.
- the antenna element 1 and the ground conductor film 22 are formed in a structure as shown in FIG. 1B directly on the dielectric substrate without being formed independently as an antenna, the direction in which the antenna extends and the ground plane
- the term “one surface” refers to a surface in the thickness direction of the ground conductor film 22 at the end face 22 a of the ground conductor film 22 closest to the power supply unit 4 (a surface perpendicular to the paper surface). are doing.
- the antenna 20 when the antenna 20 is mounted on a substrate such as a wireless LAN, as shown in FIG. 1B, the antenna 20 is not mounted so that the surface on which the antenna element 1 is formed is on the outside. As shown in FIG. 7, the surface on which the antenna element 1 is formed can be mounted facing the substrate 21 side.
- the same parts as those in FIG. 1 are denoted by the same reference numerals, and the description thereof will be omitted.
- the antenna 20 does not expose the antenna element 1 to the surface, and as shown in FIG. 5A and FIG. It may be formed inside the base 3. That is, a plurality of antenna elements 1 as described above, for example, are formed on the surface of the large ceramic first ceramic sheet 31, A second ceramic sheet 32 is superposed on the surface of the antenna element to form a laminated structure, and after dividing and firing each antenna, a feeder 4 and a ground conductor 2 are formed at the end of the antenna element 1 by applying and firing a conductive film. Even in such a configuration, the antenna element 1 is formed in the above-described relationship while extending in a direction perpendicular to one surface of the ground conductor 2. 5A and 5B, reference numerals 35 and 36 denote lands provided on the back surface side of the ceramic sheet 31 and are provided for soldering the substrate 21 and the like.
- the ground conductor film 2 on the feeder 4 side (one end side of the antenna element 1) and a center line of the element 11 extending in the vertical direction and a line parallel to the center line of the element 11 (ceramic base)
- the element length, width, and interval it is possible to obtain antennas that can obtain required bandwidths in the desired first and second frequency bands, respectively.
- An example of such a pattern is illustrated below.
- the element la connected to the power supply unit 4 is folded symmetrically about the axis of the element la (the axis perpendicular to the main plate 2), and is folded back so that the element length gradually increases.
- Antenna Such a shape may be formed on the surface of the ceramic substrate similarly to the above-described example, may be formed in the dielectric substrate by laminating a dielectric layer, or may be formed solely by a metal wire. May be done. With such a symmetrical shape, it is easy to adjust the resonance frequency.
- FIG. 7 is the same as the example shown in FIG. 6.
- the folded portion is folded obliquely instead of being folded vertically with an element parallel to the main plate 2.
- the rest is the same as the example in FIG. By being folded back diagonally in this way, there is an advantage that a wider antenna can be used.
- the element la is connected only to one side (the left side in FIG. 8) with respect to the axis of the element la connected to the power supply unit 4.
- length are gradually formed longer. That is, only the folded reference line shown in FIG. 1A is on the center line of the element la connected to the power supply unit 4, and the other points are the same as the example shown in FIG. 1, realizing a wideband antenna. There are easy advantages.
- FIG. 9 is similar to the example shown in FIG. 7, and has the structure shown in FIG. 8, with the folded portion bent obliquely. By performing such bending, there is an advantage similar to the example of FIGS.
- the force was an example of two frequency bands of 2.4GHz and 5GHz.
- the force is not limited to this frequency band, but resonates in two or more multi-frequency bands, and the bandwidth is wide especially in a high frequency band.
- the effect is particularly large.
- the present invention can be used as an antenna for a wireless LAN, a mobile phone, a Zig Bee (one of the short-range wireless communication standards for home appliances, and the same kind of technology as Bluetooth).
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Abstract
Description
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Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
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EP05726669A EP1729367A4 (en) | 2004-03-22 | 2005-03-17 | ANTENNA REPLIED |
US10/593,714 US7598921B2 (en) | 2004-03-22 | 2005-03-17 | Folded antenna |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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JP2004-083314 | 2004-03-22 | ||
JP2004083314A JP3863533B2 (ja) | 2004-03-22 | 2004-03-22 | 折返しアンテナ |
Publications (1)
Publication Number | Publication Date |
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WO2005091436A1 true WO2005091436A1 (ja) | 2005-09-29 |
Family
ID=34994014
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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PCT/JP2005/004793 WO2005091436A1 (ja) | 2004-03-22 | 2005-03-17 | 折返しアンテナ |
Country Status (5)
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US (1) | US7598921B2 (ja) |
EP (1) | EP1729367A4 (ja) |
JP (1) | JP3863533B2 (ja) |
CN (1) | CN1934752A (ja) |
WO (1) | WO2005091436A1 (ja) |
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JP6461061B2 (ja) * | 2016-09-22 | 2019-01-30 | 株式会社ヨコオ | アンテナ装置 |
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JP6978969B2 (ja) * | 2018-03-23 | 2021-12-08 | Fdk株式会社 | アンテナ装置 |
CN114503365A (zh) * | 2019-10-03 | 2022-05-13 | 株式会社村田制作所 | 天线装置以及具备天线装置的无线通信设备 |
JP7104089B2 (ja) * | 2020-03-13 | 2022-07-20 | 矢崎総業株式会社 | 折り返しアンテナ |
CN111446546B (zh) * | 2020-05-12 | 2024-02-27 | 珠海格力电器股份有限公司 | 多频天线装置 |
TWI765743B (zh) * | 2021-06-11 | 2022-05-21 | 啓碁科技股份有限公司 | 天線結構 |
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JP2003069331A (ja) * | 2001-06-15 | 2003-03-07 | Hitachi Metals Ltd | 表面実装型アンテナ及びそれを搭載した通信機器 |
JP2003124737A (ja) * | 2001-09-25 | 2003-04-25 | Samsung Electro Mech Co Ltd | 円偏波用パッチアンテナ |
JP2003218623A (ja) * | 2002-01-18 | 2003-07-31 | Ngk Insulators Ltd | アンテナ装置 |
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US3355740A (en) * | 1966-04-04 | 1967-11-28 | Univ Illinois | Log-periodic zig zag antenna |
US4286271A (en) * | 1979-02-26 | 1981-08-25 | Gte Products Corporation | Log-periodic monopole antenna |
EP0591323A1 (de) * | 1991-06-27 | 1994-04-13 | Siemens Aktiengesellschaft | Planare mäander-antenne |
US5872546A (en) * | 1995-09-27 | 1999-02-16 | Ntt Mobile Communications Network Inc. | Broadband antenna using a semicircular radiator |
JP2898921B2 (ja) | 1996-06-20 | 1999-06-02 | 株式会社ヨコオ | アンテナおよび無線機 |
GB2330951B (en) * | 1997-11-04 | 2002-09-18 | Nokia Mobile Phones Ltd | Antenna |
US5986609A (en) * | 1998-06-03 | 1999-11-16 | Ericsson Inc. | Multiple frequency band antenna |
DE60120069T2 (de) * | 2000-10-12 | 2006-12-21 | The Furukawa Electric Co., Ltd. | Miniaturisierte Antenne |
JP2002232223A (ja) * | 2001-02-01 | 2002-08-16 | Nec Corp | チップアンテナおよびアンテナ装置 |
US6674405B2 (en) * | 2001-02-15 | 2004-01-06 | Benq Corporation | Dual-band meandering-line antenna |
JP2002368517A (ja) * | 2001-06-08 | 2002-12-20 | Hitachi Metals Ltd | 表面実装型アンテナおよびそれを搭載した通信機器 |
JP2003273628A (ja) * | 2002-03-19 | 2003-09-26 | Taiyo Yuden Co Ltd | 誘電体アンテナ |
-
2004
- 2004-03-22 JP JP2004083314A patent/JP3863533B2/ja not_active Expired - Fee Related
-
2005
- 2005-03-17 CN CN200580009140.4A patent/CN1934752A/zh active Pending
- 2005-03-17 WO PCT/JP2005/004793 patent/WO2005091436A1/ja active Application Filing
- 2005-03-17 EP EP05726669A patent/EP1729367A4/en not_active Withdrawn
- 2005-03-17 US US10/593,714 patent/US7598921B2/en not_active Expired - Fee Related
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
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JPH11168318A (ja) * | 1997-10-03 | 1999-06-22 | Nippon Telegr & Teleph Corp <Ntt> | 多周波共用セクタアンテナ装置 |
JP2002314322A (ja) * | 2001-02-07 | 2002-10-25 | Furukawa Electric Co Ltd:The | 小型アンテナ |
JP2003069331A (ja) * | 2001-06-15 | 2003-03-07 | Hitachi Metals Ltd | 表面実装型アンテナ及びそれを搭載した通信機器 |
JP2003124737A (ja) * | 2001-09-25 | 2003-04-25 | Samsung Electro Mech Co Ltd | 円偏波用パッチアンテナ |
JP2003218623A (ja) * | 2002-01-18 | 2003-07-31 | Ngk Insulators Ltd | アンテナ装置 |
Also Published As
Publication number | Publication date |
---|---|
US20080238778A1 (en) | 2008-10-02 |
CN1934752A (zh) | 2007-03-21 |
EP1729367A1 (en) | 2006-12-06 |
EP1729367A4 (en) | 2009-11-04 |
US7598921B2 (en) | 2009-10-06 |
JP3863533B2 (ja) | 2006-12-27 |
JP2005277448A (ja) | 2005-10-06 |
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