EP1267439A1 - Multiple frequency bands antenna using two concentric interleaved antennas, the external one being a meander line antenna - Google Patents
Multiple frequency bands antenna using two concentric interleaved antennas, the external one being a meander line antenna Download PDFInfo
- Publication number
- EP1267439A1 EP1267439A1 EP02253367A EP02253367A EP1267439A1 EP 1267439 A1 EP1267439 A1 EP 1267439A1 EP 02253367 A EP02253367 A EP 02253367A EP 02253367 A EP02253367 A EP 02253367A EP 1267439 A1 EP1267439 A1 EP 1267439A1
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- EP
- European Patent Office
- Prior art keywords
- antenna
- antenna element
- portions
- frequency band
- frequency bands
- 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.)
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Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q21/00—Antenna arrays or systems
- H01Q21/30—Combinations of separate antenna units operating in different wavebands and connected to a common feeder system
-
- 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
-
- 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
- H01Q1/362—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith for broadside radiating helical 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
- H01Q5/40—Imbricated or interleaved structures; Combined or electromagnetically coupled arrangements, e.g. comprising two or more non-connected fed radiating elements
Definitions
- the cylindrical dielectric material 6 has a bore 11 for receiving the elongated conductor or monopole of the first antenna element 3, a supporting surface 12 for supporting the disc 8 of the first antenna element 3, and an outside diameter adapted to the internal diameter of the substantially meandering coil.
Abstract
Description
- The present invention generally relates to antennas adapted to operate in multiple frequency bands, and more particularly to multi band antennas used for wireless communication systems such as cellular telephone systems.
- Wireless communication systems, e. g. cellular telephone systems, are usually based on radio frequency (RF) waves. There are analog and digital standards in use in various regions of the world being created to provide an acceptable level of compatibility for wireless communication systems, i. e. to standardize design criteria for cellular telephone devices. The standards differ from each other significantly in their operating frequency ranges. For example, GSM (Global System for Mobile communication) is a digital standard that typically operates at a low frequency band, such as between 880 MHz and 960 MHz, while AMPS (Advanced Mobile Phone System) is an analog standard that typically operates at frequency bands between 824 MHz and 894 MHz. Further digital standards in wide use are DCS (Digital Communication System) having high frequency bands between 1710 MHz and 1880 MHz, and PCS (Personal Communication System) having operating frequencies of 1850 MHz to 1990 MHz, wherein both DCS and PCS are based on GSM.
- Cellular telephone devices used for wireless communication systems necessarily include an antenna for receiving and transmitting radio frequency signals such as the widely employed monopole antennas. Since the resonating frequency of an antenna depends on the length of the antenna in a known manner due to the wavelength of the RF-waves, a certain antenna can be used only for a certain frequency range. Due to the different standards, however, it is desirable that one and the same cellular telephone device is able to operate within widely separated frequency bands in order to utilize more than one standard. Therefore, an antenna adapted to operate in multiple frequency bands is needed.
- Furthermore, cellular telephone devices are increasingly undergoing a miniaturization to cater to consumer's demand for convenience. As a result, antennas utilized by such devices also have to become smaller and lighter. However, as antennas become smaller, the frequency bands within which they can operate typically become narrower. Consequently, helix antennas are often employed for cellular telephone devices operating within multiple frequency bands. Helix antennas typically include a conducting member wound in a helical pattern. As the radiating element of a helix antenna is wound about an axis, the axial length of the helix antenna can be considerably less than the length of a comparable monopole antenna. Hence, helix antennas can be used where the length of a monopole antenna is too extended.
- Accordingly, there is a need for an antenna to be relatively compact in size and to be capable of operating in multiple widely separated frequency bands such as GSM and PCS. Small multi band antennas providing adequate bandwidth in at least two frequency bands are known.
- For instance, U.S. Pat. No. 6,075,488 to Hope discloses a broadband antenna that includes a centrally positioned high frequency-radiating element surrounded by a dielectric support element, and a linear radiating element in the form of a wire wound over the dielectric support element and extending generally over the entire length of centrally positioned high frequency radiating element, thus defining an over-wound helical coil. The length of the linear radiating element is such that it supports resonance at a lower frequency. Such an antenna can resonate at two broadly separated frequencies and, therefore, is configured for dual frequency band operation.
- Furthermore, U.S. Pat. No. 6,127,979 to Zhou et al. reveals a multi band antenna that comprises a fixed whip antenna element and a helical coil antenna element coupled to a single feed point. The antenna is reduced in size by attaching a disc to the end of the whip antenna element, while decreasing the pitch of the helical coil antenna element. A dielectric material surrounds the whip antenna element and provides support for the helical coil antenna element.
- It turned out that a certain precisely predetermined distance between the top of the whip antenna element and the corresponding end of the helical coil antenna element is extremely important with regard to the performance of the antenna. However, mounting of the helical coil antenna element often causes variations to this distance. Such variations are difficult to control due to the elasticity of the helical coil antenna element. In addition, because of low production costs, the helical coil antenna element is usually manufactured with wide tolerances. Thus, inaccuracies in the pitch of the helical coil antenna element occur.
The present invention seeks to provide an improved antenna structure. - The present invention provides an antenna, which is designed to operate in multiple frequency bands, and includes a first antenna element for receiving and transmitting signals in a first frequency band, and a second antenna element for receiving and transmitting signals in a second frequency band. The first antenna element has a substantially elongated conductor of a predetermined first pitch, which is coupled to a feed point. The second antenna element has a substantially meandering coil of a predetermined second pitch, which is coupled to said feed point. The substantially meandering coil comprises a plurality of first portions having a wound form and surrounding at least partly said first antenna element, and also comprises a plurality of second portions having a straight form. The first portion extends from an upper end of said second portion to a lower end of a subsequent second portion following in axial direction of the second antenna element.
- In accordance with a preferred embodiment of the present invention, the second portions can extend parallel to the elongated conductor of the first antenna element. Also, the first portions can extend concentric to the elongated conductor of the first antenna element. Preferably, the first portions and the second portions can be perpendicular.
- Further in accordance with a preferred embodiment of the present invention, one first portion can be arranged at the top and another first portion can be arranged at the bottom of the second antenna element. In addition, the first portion arranged at the bottom of said second antenna element can be formed as a closed ring.
- Still further in accordance with a preferred embodiment of the present invention, the first antenna element can be a fixed whip antenna. Preferably, the first antenna element can have a disk on the top of the substantially elongated conductor.
- According to another embodiment of the present invention, the antenna can comprise a RF matching network that matches the first antenna element and the second antenna element.
- In accordance with a preferred embodiment of the present invention, the antenna comprises a dielectric material surrounding the first antenna element, wherein the substantially meandering coil of the second antenna element is supported by the dielectric material.
- Preferably, the second antenna element can be made of a punched-out metal sheet or of a formed plastic that is plated with copper. Moreover, in accordance with a preferred embodiment of the present invention, the second frequency band is one of a GSM and AMPS band and the first frequency band is one of a DCS and PCS band.
- Antennas according to the the described embodiments are particularly well suited for operation within wireless communiction systems such as cellular telephone systems utilizing multiple, widely and separated frequency bands. Furthermore, because of their small size, such antennas can be employed within very small communications devices. Besides, because the second antenna element having the form of a substantially meandering coil comprises a plurality of first portions having a wound form and a plurality of second portions having a straight form, wherein the first portion extends from an upper end of said second portion to a lower end of a subsequent second portion following in axial direction of the second antenna element, antennas according to the present invention can be manufactured with a steady performance. The reason for this is that the second antenna element according to the present invention is more rigid and can be manufactured more accurately in the pitch than conventional helix antenna elements. As a result, the distance between the top of the first high frequency antenna element and the corresponding end of the second low frequency antenna element is easy to keep constant.
- An embodiment of the present invention is described below, by way of example only, with reference to the accompanying drawings, in which:
- FIG. 1 is a schematic view showing an antenna adapted to receive and transmit signals in multiple frequency bands;
- FIG. 2 is a plan view showing a low frequency antenna element according to a first embodiment of the present invention;
- FIG. 3 is a perspective view showing a low frequency antenna element according to a second embodiment of the present invention;
- FIG. 4 is an exploded view showing components of an antenna according to a modification of the second embodiment of the present invention;
- FIG. 5 is a perspective view showing partially assembled components according to FIG. 4;
- FIG. 6 is a schematic view showing a low frequency antenna element according to a third party of the present invention.
- FIG. 7 is a chart showing the frequency response of an antenna according to embodiments of the present invention;
- FIG. 8 is a schematic block diagram showing an interface between the antenna according to embodiments of the present invention and a RF matching network; and
- FIG. 9 is a perspective view showing how the antenna according to embodiments of the present invention can be connected to a RF matching network.
-
- Reference is now made to FIG. 1, which illustrates a
dual band antenna 1 constructed and operative in accordance with an embodiment of the present invention. As shown in FIGS. 1 and 9, theantenna 1 comprises an outer housing orovermold 2, which is used to protect and hold together the whole antenna structure. Within theovermold 2, which defines the appearance of theantenna 1 as well, there is afirst antenna element 3 for receiving and transmitting signals in a high frequency band, i.e. in the DCS band. Thefirst antenna element 3 has a substantially elongated conductor or monopole of a predetermined pitch, which elongated conductor forms a fixed whip antenna and which is coupled to afeed point 4. Thefeed point 4 extends to acoupling portion 5, which is electrically connected to aRF matching network 15 as shown in FIG. 8. TheRF matching network 1 5 is used to match the impedance of the antenna to 1 that of a T/R switch 16 and comprises several capacitors and inductors. The functioning of a similarRF matching network 16 is described in U.S. Pat. 6,127,979, the disclosure of which is incorporated herein by reference. - The
antenna 1 further comprises adielectric material 6 such as santoprene or polypropylene, which surrounds thefirst antenna element 3, and asecond antenna element 7 for receiving and transmitting signals in a lower frequency band, i. e. in the GSM band. Both thefirst antenna element 3 and thesecond antenna element 7 are coupled to thefeed point 4. Thesecond antenna element 7 also has a substantially meandering coil of a predetermined pitch, which is supported by thedielectric material 6. Thedielectric material 6 holds the elongated conductor of thefirst antenna element 3, thereby ensuring concentricity of the elongated conductor within the substantially meandering coil of thesecond antenna element 7. Additionally, thedielectric material 6 holds adisc 8 that is set on the top of the substantially elongated conductor to shorten the overall length of theantenna 1. In contrast to the teaching of U. S. Pat. No 6,127,979 thedielectric material 6 is no longer required for securing the distance between the top of thesecond antenna element 7 and thedisc 8. The reason for this is the rigidity of thesecond antenna element 7 caused by the substantially meandering coil. - Turning now to FIGS. 2 and 3, two variations of the substantially meandering coil of the
second antenna element 7 according to preferred embodiments of the present invention are shown. - According to a first embodiment of the present invention, the substantially meandering coil illustrated in FIG. 2 comprises a plurality of
first portions 7a and a plurality ofsecond portions 7b. Thefirst portions 7a have a wound form that concentrically surrounds the elongated conductor of thefirst antenna element 3 in the assembled position of theantenna 1. Since FIG. 2 is a plan view, the wound form of thefirst portions 7a cannot be seen. As opposed to thefirst portions 7a, thesecond portions 7b have a straight form so that they extend parallel to the elongated conductor of thefirst antenna element 3 in the assembled position of theantenna 1. Because thefirst portions 7a concentrically surround the elongated conductor, thefirst portions 7a and thesecond portions 7b are perpendicular. FIG. 2 clearly depicts that thesecond portions 7b are arranged so that a singlefirst portion 7a extends from the upper end of asecond portion 7b to the lower end of a subsequentsecond portion 7b following in the axial direction of thesecond antenna element 7. - FIG. 3 shows a substantially meandering coil according to a second embodiment of the present invention, which is similar to the
second antenna element 7 described above. FIG. 3 is a perspective view, which clearly shows that thefirst portions 7a have a wound form surrounding partly the elongated conductor of thefirst antenna element 3. The substantially meandering coil according to FIG. 3 has onefirst portion 7a that is arranged at the top of thesecond antenna element 7 and anotherfirst portion 7a that is arranged at the bottom of thesecond antenna element 7. Because of thefirst portions 7a arranged at the top and the bottom of thesecond antenna element 7, a precise pitch of the substantially meandering coil can easily be provided. Moreover, thefirst portion 7a arranged at the bottom of thesecond antenna element 7 is formed as a closed ring. The inside diameter of the ring corresponds to the diameter of the elongated conductor or monopole of thefirst antenna element 3, thus, allowing a centering offirst antenna element 3 andsecond antenna element 7. - Referring to FIGS. 4 and 5, a modification of the second embodiment of the present invention is shown. The
second antenna element 7 according to FIGS. 4 and 5 comprisesfirst portions 7a both at the top and the bottom of the substantially meandering coil. Contrary to thesecond antenna element 7 of FIG. 3, thefirst portions 7a of the substantially meandering coil have an almost completely closed ring form. Consequently, thefirst portions 7a nearly entirely surround the elongated conductor of thefirst antenna element 3. The substantially meandering coil according to FIGS. 4 and 5 can be simply made of a metal sheet by appropriate punching out and bending. The thickness of the metal sheet ensures a satisfactory rigidity of thesecond antenna element 7. Alternatively, the substantially meandering coil can be made of a formed plastic that is plated with copper or any right metal. - FIG. 4 illustrates the components of the
antenna 1 in an exploded view. FIG. 5 shows the components of FIG. 4 in an assembled position of theantenna 1, but without thedielectric material 6 and theovermold 2. As can be seen from FIG. 4, theantenna 1 can simply be assembled by introducing both thefirst antenna element 3 and thesecond antenna element 7 inappropriate recesses feed point 4, thereby fixing and aligning the elongated conductor of thefirst antenna element 3 and the substantially meandering coil of thesecond antenna element 7. Moreover, thedielectric material 6 secures a reliable and lasting alignment offirst antenna element 3 andsecond antenna element 7. To this end, the cylindricaldielectric material 6 has abore 11 for receiving the elongated conductor or monopole of thefirst antenna element 3, a supportingsurface 12 for supporting thedisc 8 of thefirst antenna element 3, and an outside diameter adapted to the internal diameter of the substantially meandering coil. As a result, there is both a positive locking and an additional frictional connection of thefirst antenna element 3, thesecond antenna element 7, and the cylindricaldielectric material 6 into therecess 9 of thefeed point 4. - Turning now to FIG. 6, a third embodiment of the present invention is shown. As shown in FIG. 6, the substantially meandering coil of the
second antenna element 7 comprises a plurality offirst portions 7a and a plurality ofsecond portions 7b. In contrast to the first and second embodiments of the present invention, thesecond antenna element 7 illustrated in FIG. 6 consists of a flexible foil, in particular a flexible PCB, which can be wrapped around thefirst antenna element 3 or thedielectric material 6 surrounding thefirst antenna element 3. - With reference to FIG. 7, which illustrates a graph showing the return loss R in 2 dB increments as a function of frequency f. As can be seen in the figure, the antenna according to the present invention operates signals in frequency bands of about 830 MHz to about 960 MHz and of about 1710 MHz to about 1990 MHz, which cover the widespread standards of GSM, AMPS, DCS and PCS. While the present example sets forth that the high and low frequency bands are DCS and GSM bands, respectively, one skilled in the art will appreciate that other combinations of frequency bands may be implemented by modifying the length of the
first antenna element 3 and thesecond antenna element 7 without departing from the spirit and scope of the present invention. For example, other possible combinations of low and high bands could include GSM + PCS, AMPS + DCS, AMPS + PCS, or any other combination of one and more lower and higher frequency bands of known standards. - FIG. 9 shows a 3-dimensional perspective view of how the
antenna 1 can be interfaced to a system. This will form part of the antenna feeding mechanism to the transceiver. In particular, thecoupling portion 5 is connected to mechanical andelectrical contacts 13 which are arranged in thehousing 14 of the system, theantenna 1 is connected to. Via the mechanical andelectrical contacts 13, theantenna 1 is coupled to the respective network in the system. - In summary, the
antenna 1 discussed above by means of preferred embodiments operates as do prior art dual band antennas over a wide frequency range and is comparatively small sized. Therefore, theantenna 1 is particularly well suited for operation within wireless communication systems, e. g. cellular telephone devices. However, theantenna 1 of the present invention improves the production with regard to a steady performance of the antenna. The reason for this is that thesecond antenna element 7 is more rigid and can be manufactured more accurately in the pitch than conventional helix antenna elements because of the inventive arrangement offirst portions 7a andsecond portions 7b. As a result, the distance between thedisc 8 on the top of the elongated conductor of thefirst antenna element 7 and the adjacent end of thefirst portion 7a arranged at the top of the substantially meandering coil is easy to keep constant. - The foregoing is illustrative of embodiments of the present invention and is not to be construed as limiting thereof. Although a few exemplary embodiments of this invention has been described, those skilled in the art will readily appreciate that many modifications are possible in the exemplary embodiments without materially departing from the teachings and advantages disclosed herein. Accordingly, all such modifications are intended to be included within the scope of the claims.
- The disclosures in Singapore patent application no. 200103546-8, from which this application claims priority, and in the abstract accompanying this applications are incorporated herein by reference.
Claims (11)
- An antenna designed to operate in multiple frequency bands, including:a first antenna element (3) for receiving and transmitting signals in a first frequency band having a substantially elongate conductor of a predetermined first pitch coupled to a feed point (4);a second antenna element (7) for receiving and transmitting signals in a second frequency band having a substantially meandering coil of a predetermined second pitch coupled to said feed point (4);said substantially meandering coil including a plurality of first portions (7a) having a wound form and surrounding at least partly said first antenna element (3), and a plurality of second portions (7b) having a straight form;said first portion (7a) extending from an upper end of said second portion (7b) to a lower end of a subsequent second portion (7b) following in the axial direction of the second antenna element (7).
- An antenna according to claim 1, wherein said second portions (7b) extend substantially parallel to said elongate conductor of said first antenna element (3).
- An antenna (1) according to claim 1 or 2, wherein said first portions (7a) extend substantially concentrically to said elongate conductor of said first antenna element (3).
- An antenna (1) according to claim, 2 or 3, wherein said first portions (7a) and said second portions (7b) are substantially perpendicular to one another.
- An antenna (1) according to any preceding claim, wherein one first portion (7a) is arranged at the top and another first portion (7a) is arranged at the bottom of said second antenna element (3), said first portion (7a) arranged at the bottom of said second antenna element preferably being formed as a closed ring.
- An antenna (1) according to claim 1, wherein said first antenna element (3) is a fixed whip antenna.
- An antenna according to claim 1, wherein said first antenna element (3) has a disk on the top of said substantially elongate conductor.
- An antenna according to any preceding claim, including a RF matching network matching said first antenna element (3) and said second antenna element (7).
- An antenna according to any preceding claim, including a dielectric material substantially surrounding said first antenna element (3), wherein said substantially meandering coil of said second antenna element (7) is supported by said dielectric material.
- An antenna according to any preceding claim, wherein said second antenna element (7) is made from a punched out metal sheet or of a plastic material plated with copper or other metal or metal alloy.
- An antenna according to any preceding claim, wherein said second frequency band is one of a GSM and AMPS band and said first frequency band is one of DCS and PCS band.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SG200103546 | 2001-06-15 | ||
SG200103546 | 2001-06-15 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1267439A1 true EP1267439A1 (en) | 2002-12-18 |
EP1267439B1 EP1267439B1 (en) | 2005-07-27 |
Family
ID=20430783
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP02253367A Expired - Fee Related EP1267439B1 (en) | 2001-06-15 | 2002-05-14 | Multiple frequency bands antenna using two concentric interleaved antennas, the external one being a meander line antenna |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP1267439B1 (en) |
JP (1) | JP2003037418A (en) |
DE (1) | DE60205181T2 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7286090B1 (en) | 2006-03-29 | 2007-10-23 | Hong Kong Applied Science And Technology Research Institute Co., Ltd. | Meander feed structure antenna systems and methods |
DE102004029215B4 (en) * | 2004-05-04 | 2011-12-29 | Samsung Electro-Mechanics Co., Ltd. | Multiband multilayer chip antenna |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2005176302A (en) | 2003-09-26 | 2005-06-30 | Nec Access Technica Ltd | Antenna assembly of portable terminal, and wireless installation capable of receiving broadcast wave |
JP4971212B2 (en) * | 2008-01-31 | 2012-07-11 | 日本アンテナ株式会社 | Helical whip antenna |
KR101379123B1 (en) | 2010-12-17 | 2014-03-31 | 주식회사 케이티 | Wideband Single Resonance Antenna |
KR101446248B1 (en) | 2010-12-29 | 2014-10-01 | 주식회사 케이티 | external Antenna Using Linear Array |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1997018601A1 (en) * | 1995-11-15 | 1997-05-22 | Allgon Ab | Dual band antenna means |
WO1997049141A1 (en) * | 1996-06-15 | 1997-12-24 | Allgon Ab | Meander antenna device |
US6127979A (en) * | 1998-02-27 | 2000-10-03 | Motorola, Inc. | Antenna adapted to operate in a plurality of frequency bands |
WO2000065684A2 (en) * | 1999-04-21 | 2000-11-02 | Siemens Aktiengesellschaft | Antenna, use of an antenna of this type and method for producing the same |
-
2002
- 2002-05-14 DE DE60205181T patent/DE60205181T2/en not_active Expired - Lifetime
- 2002-05-14 EP EP02253367A patent/EP1267439B1/en not_active Expired - Fee Related
- 2002-06-14 JP JP2002173645A patent/JP2003037418A/en active Pending
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1997018601A1 (en) * | 1995-11-15 | 1997-05-22 | Allgon Ab | Dual band antenna means |
WO1997049141A1 (en) * | 1996-06-15 | 1997-12-24 | Allgon Ab | Meander antenna device |
US6127979A (en) * | 1998-02-27 | 2000-10-03 | Motorola, Inc. | Antenna adapted to operate in a plurality of frequency bands |
WO2000065684A2 (en) * | 1999-04-21 | 2000-11-02 | Siemens Aktiengesellschaft | Antenna, use of an antenna of this type and method for producing the same |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102004029215B4 (en) * | 2004-05-04 | 2011-12-29 | Samsung Electro-Mechanics Co., Ltd. | Multiband multilayer chip antenna |
US7286090B1 (en) | 2006-03-29 | 2007-10-23 | Hong Kong Applied Science And Technology Research Institute Co., Ltd. | Meander feed structure antenna systems and methods |
US7525488B2 (en) | 2006-03-29 | 2009-04-28 | Hong Kong Applied Science And Technology Research Institute Co., Ltd. | Meander feed structure antenna systems and methods |
Also Published As
Publication number | Publication date |
---|---|
EP1267439B1 (en) | 2005-07-27 |
JP2003037418A (en) | 2003-02-07 |
DE60205181T2 (en) | 2006-06-01 |
DE60205181D1 (en) | 2005-09-01 |
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