WO2004105182A1 - Antenne double bande avec diversite - Google Patents

Antenne double bande avec diversite Download PDF

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Publication number
WO2004105182A1
WO2004105182A1 PCT/GB2004/002133 GB2004002133W WO2004105182A1 WO 2004105182 A1 WO2004105182 A1 WO 2004105182A1 GB 2004002133 W GB2004002133 W GB 2004002133W WO 2004105182 A1 WO2004105182 A1 WO 2004105182A1
Authority
WO
WIPO (PCT)
Prior art keywords
antenna device
area
feedlines
groundplane
dielectric
Prior art date
Application number
PCT/GB2004/002133
Other languages
English (en)
Inventor
James William Kingsley
Christopher Morgans
Richard Baggaley
Steven Martin
Andrew Wyatt
Simon Philip Kingsley
Original Assignee
Antenova Limited
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 Antenova Limited filed Critical Antenova Limited
Publication of WO2004105182A1 publication Critical patent/WO2004105182A1/fr

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Classifications

    • 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
    • H01Q1/2258—Supports; Mounting means by structural association with other equipment or articles used with computer equipment
    • 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
    • H01Q21/00—Antenna arrays or systems
    • H01Q21/24—Combinations of antenna units polarised in different directions for transmitting or receiving circularly and elliptically polarised waves or waves linearly polarised in any direction
    • 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
    • H01Q9/0485—Dielectric resonator antennas
    • 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
    • H01Q9/40—Element having extended radiating surface
    • 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 dual band antenna for use in mobile telephone handsets, PDAs (Personal Digital Assistants), PCMCIA cards, WLAN access points and other electrically small radio platforms.
  • Embodiments of the present invention seek to provide a dual band antenna device having wide bandwidth in both bands and including two antenna elements so as to provide diversity.
  • Embodiments of the present invention may incorporate various types of antenna devices, including dielectric resonator antennas (DRAs), high dielectric antennas (HDAs), dielectrically loaded antennas (DLAs), dielectrically excited antennas (DEAs) and traditional conductive antennas made out of electrically conductive materials.
  • DRAs dielectric resonator antennas
  • HDAs high dielectric antennas
  • DLAs dielectrically loaded antennas
  • DEAs dielectrically excited antennas
  • traditional conductive antennas made out of electrically conductive materials.
  • DRAs are well known in the prior art, and generally are formed as a pellet of a high permittivity dielectric material, such as a ceramic material, that is excited by a direct microstrip feed, by an aperture or slot feed or by a probe inserted into the dielectric material.
  • a DRA generally requires a conductive groundplane or grounded substrate.
  • the main radiator is the dielectric pellet, radiation being generated by displacement currents induced in the dielectric material.
  • HDAs are similar to DRAs, but instead of having a full ground plane located under the dielectric pellet, HDAs have a smaller ground plane or no ground plane at all.
  • DRAs generally have a deep, well-defined resonant frequency, whereas HDAs tend to have a less well-defined response, but operate over a wider range of frequencies.
  • a DLA generally has the form of an electrically conductive element that is contacted by a dielectric element, for example a ceramic element of suitable shape.
  • the primary radiator in a DLA is the electrically conductive element, but its radiating properties are modified by the dielectric element so as to allow a DLA to have smaller dimensions than a traditional conductive antenna with the same performance.
  • a further type of antenna recently developed by the present applicant is the dielectrically excited antenna (DEA).
  • DEA comprises a DRA, HDA or DLA used in conjunction with a conductive antenna, for example a planar inverted-L antenna (PILA) or planar inverted-F antenna (PIFA).
  • PILA planar inverted-L antenna
  • PIFA planar inverted-F antenna
  • the dielectric antenna component i.e. the DRA, HDA or DLA
  • a conductive antenna located in close proximity to the dielectric antenna is parasitically excited by the dielectric antenna, often radiating at a different frequency so as to provide dual or multi band operation.
  • the conductive antenna may be driven so as parasitically to drive the dielectric antenna.
  • the different views of the signal can be combined to achieve some optimum or at least improved performance such as maximum or at least improved signal to noise ratio, minimum or at least reduced interference, maximum or at least improved carrier to interference ratio, and so forth.
  • Signal diversity using several antennas can be achieved by separating the antennas (spatial diversity), by pointing the antennas in different directions (pattern or directional diversity) or by using different polarisations (polarisation diversity).
  • Antenna diversity is also important for overcoming the multi-path problem, where an incoming signal is reflected off buildings and other structures resulting in a plurality of differently phased components of the same signal.
  • a significant problem arises when diversity is required from a small space or volume such that the antennas have to be closely spaced.
  • An example of this is when a PCMCIA card, inserted into a laptop computer, is used to connect to the external world by radio.
  • Most high data rate radio links require diversity to obtain the necessary level of performance, but the space available on a PCMCIA card is generally of the order of about 1/3 of a wavelength. At such a close spacing, most antennas will couple closely together and will therefore tend to behave like a single antenna.
  • isolation there is little isolation between the antennas and, consequently, there is little diversity or difference in performance between the antennas.
  • about -20dB coupling (isolation) is the target specification between antennas operating on the same band for a PCMCIA card.
  • access points in WLAN and the like applications
  • -40dB Such high isolation is extremely hard to achieve with conventional antennas when the access points are the size of domestic smoke alarms and less than a wavelength across.
  • isolation between WLAN and Bluetooth® antennas of -40dB or more is seen as desirable.
  • Kumar & K. P. Ray, Artech House, 2003] describes how the fat dipole concepts can be extended to printed microstrip antennas (MS As).
  • Figure 2 shows the general design of an MSA and Kumar & Ray show that rectangular, triangular, hexagonal and circular printed microstrip antennas all have broadband properties.
  • an antenna device comprising a dielectric substrate with first and second opposed surfaces and having a width and a length, a conductive ground plane formed on a first area of the second surface of the substrate and leaving a second area of the second surface blank, at least two conductive feedlines formed on the first surface of the substrate or between the first and second surfaces and extending from an area corresponding to the first area of the second surface to an area corresponding to the second area of the second surface, each feedline being provided with a dielectric element in the area corresponding to the second area of the second surface, and at least one slot or discontinuity being formed in the conductive ground plane at an interface between the first and second areas in a region between the feedlines.
  • a second dielectric substrate may be provided on the second surface so as to sandwich the groundplane between the dielectric substrate and the second dielectric substrate. It will be appreciated that this is entirely equivalent to a single dielectric substrate having the groundplane formed between the first and second surfaces.
  • the dielectric substrates are preferably the same size and shape, although this need not always be so.
  • the interface extends generally across the width of the dielectric substrate, and may be formed as a substantially straight line except at the location of the slot or discontinuity. Where the dielectric substrate has a rectangular shape, the interface may extend generally parallel to an end edge of the dielectric substrate. Alternatively, the interface may be curved or may meander or may be formed at an angle or slope relative to an end edge of the dielectric substrate.
  • the slot or discontinuity is formed as a gap or cut-out in the groundplane that extends generally towards a central part of the dielectric substrate from the interface.
  • the gap or cut-out may have a length of around 5mm to 20mm or more, and may have a width of about 2mm to 10mm or more. The precise dimensions of the gap or cut-out will depend on the desired operating characteristics of the antenna device.
  • the gap or cut-out may be generally rectangular, or may be trapezoidal or re-entrant in configuration, or may have any other desirable shape. What is important is that the gap or cut-out extends between the two feedlines on the side of the interface facing away from the location of the dielectric elements.
  • a plurality of gaps or cut-outs may be provided between the feedlines, for example by providing a castellated or crenellated edge to the interface between the feedlines. It will be appreciated that in these embodiments, the gaps or cut-outs extend generally into the groundplane from a basis line of the interface.
  • the discontinuity may be formed as one or more, preferably several, projections of the groundplane from the basis line of the interface into the second area, the projections being between the feedlines.
  • the projections may be generally rectangular, or may be trapezoidal or any other suitable shape.
  • a castellated or crenellated profile may be formed in the groundplane at the interface and between the feedlines.
  • the extension may optionally pass over the edge from the second surface of the dielectric substrate to the first, and then double-back along the first surface, generally following its line on the second surface, between the dielectric elements and the feedlines.
  • the extension may terminate on the first surface at a point corresponding to the location of the gap or cut-out on the second surface, preferably behind the basis line of the interface and in the first area.
  • a second conductive groundplane may be provided on the first surface of the dielectric substrate (but electrically isolated from the feedlines).
  • the second groundplane may terminate at an interface on the first surface that is somewhat set back from the interface on the second surface, for example at a position on the first surface corresponding to the base of the slot or cut-out on the second surface.
  • the second groundplane can help to isolate the feedlines from external electromagnetic interference. Instead of projecting from a gap in the interface on the second surface, the groundplane extension may instead project directly from the interface.
  • a plurality of groundplane extensions may be provided, either extending from gaps in the interface or directly from the interface, or some combination of both.
  • all embodiments of the present invention may include a second groundplane provided on the first surface for isolation purposes.
  • the feedlines generally diverge from each other on the first surface of the dielectric substrate in the second area.
  • a divergence angle of substantially 90° is preferred, although a smaller or larger divergence angle may be used so as still to give beam diversity albeit with some sacrifice of polarisation diversity.
  • Dielectric elements are provided in association with the feedlines on the first surface in the second area.
  • the dielectric elements may be made of dielectric ceramics materials with a dielectric constant (relative permittivity) greater than 5, and more preferably greater than 10 or greater than 100.
  • the dielectric elements may various forms depending on the operational characteristics desired. For example, the elements may be formed as oblongs, wedges, trapezoids, parallelepipeds or other shapes, and may have edges or surfaces thereof ground or filed down so as to provide chamfers and curves.
  • each dielectric element for example a top surface, a bottom surface and/or one or more side surfaces can be metallised or provided with a conductive coating.
  • metallising a top surface of a dielectric element can help to reduce the size of the element required for a given operational frequency, or can help to adjust or change an operating frequency of the antenna thus formed.
  • two feedlines are provided, each feedline having one dielectric element associated therewith.
  • the feedlines may be formed as printed microstrip transmission lines or in any other appropriate manner.
  • the dielectric elements may be bonded to the feedlines in the second area on the first surface, for example by way of soldering or using an electrically conductive epoxy resin, or may be otherwise associated with the feedlines so as to form a dielectric antenna.
  • Specific types of dielectric antenna configuration that are useful with the present invention include DRAs, HDAs, DLAs and DEAs as defined in the introduction to the present application. Full operational and structural details of these types of dielectric antennas are outside the scope of the present application, but further information may, for example, be found in the present applicant's co-pending application GB 2 388 964 the disclosure of which is hereby incorporated into the present application by reference.
  • the dielectric elements will be mounted on top of the feedlines on the first surface.
  • the feedlines may extend beyond the dielectric elements, for example towards corners of the dielectric substrate in the second area, thus forming "tails" or “overhangs".
  • the tails or overhangs may be substantially in line with the rest of the feedlines in the second area, or may include end portions that are bent or curved, for example towards or away from or generally parallel to a longitudinal centre line of the dielectric substrate.
  • the tails or overhangs, and/or the feedlines generally, especially in the second area, may be curved or may meander or take various other configurations.
  • PIN diode switches or other switches may be provided so as to switch in or out additional sections of feedline, for example at one or both of the tails or overhangs, thereby allowing an operating frequency of one or other of the dielectric antennas to be adjusted. This can be useful when the antenna device is to be used in different countries where one or other or both of an upper and a lower band needs to be raised or lowered to a different frequency.
  • a pair of isolated conductive plates or patches may be provided on the second surface of the substrate underneath the dielectric elements which are located on the first surface.
  • the conductive plates or patches each have a slot which is arranged generally orthogonal to the respective feedline, which crosses over the slot.
  • a groundplane extension is provided on the second surface so as to extend from the interface to an edge of the second area and passes between the conductive plates or patches.
  • the dielectric elements may be formed as generally flat rectangular elements, which may be substantially square.
  • the plates or patches may have a shape and area substantially the same as the dielectric elements, or may be slightly smaller or slightly larger.
  • a low profile antenna device can be constructed, which is particularly advantageous in PCMCIA card applications.
  • the first and second feedlines are substantially orthogonal to each other where they pass under their respective dielectric elements, thus providing the best polarisation diversity.
  • One of the feedlines may follow (on the first surface) a path of the groundplane extension (on the second surface) before extending under its dielectric element.
  • the slots radiate in one frequency band, and the plates or patches radiate in a second frequency band, thus providing dual band operation.
  • the dielectric elements serve to provide a dielectric loading for both bands of operation and thereby help to make the antenna device more compact.
  • FIGURE 1 shows a prior art WLAN antenna device
  • FIGURE 2 shows a prior art printed 'fat' monopole antenna device
  • FIGURE 3 shows a first embodiment of the present invention
  • FIGURE 4 shows an alternative first embodiment of the present invention
  • FIGURE 5 shows a second embodiment of the present invention
  • FIGURE 6 shows measured and simulated return losses of the antenna device of Figure 3 and the isolation between the antenna elements
  • FIGURE 7 shows a perspective view of a third embodiment of the present invention.
  • FIGURE 8 shows a schematic plan view of the third embodiment
  • FIGURE 9 shows a plan view of a part of the third embodiment
  • FIGURE 10 shows an underplan view of a part of the third embodiment
  • FIGURE 11 shows return loss and isolation for the third embodiment
  • FIGURE 12 shows a schematic view of a fourth embodiment of the present invention.
  • FIGURE 13 shows return loss for the antenna device of Figure 12.
  • Figure 1 shows a prior art printed microstrip dual monopole antenna device, including a dielectric substrate 1 in the form of an FR4 PCB, a main conductive groundplane 2 on the underside of the substrate 1, two printed microstrip lines 3 on the upper side of the substrate 1, the lines 3 terminating in two radiating sections 4, and a small 'T'-shaped section of groundplane 5 on the underside of the substrate 1 in a location between the two radiating points 4.
  • Figure 1 also shows the device in cross-section, where it can be seen how the two microstrip lines 3 pass from the upper side of the substrate 1 to its lower side through a pair of gaps or holes 6 in the groundplane 2, and terminate in a pair of SMA connectors 7 which are electrically isolated from the groundplane 2 by insulating washers 8.
  • the two microstrip lines 3 are configured such that the radiating sections 4 point towards corners 9 of the substrate 1 and are disposed at 90 degrees to each other.
  • No groundplane 2 is provided underneath the radiating sections 4.
  • This prior art antenna device has a narrow bandwidth in operation, and is acknowledged in the prior art to be unsuitable for mobile communications for this reason.
  • Figure 2 shows another prior art antenna device, also comprising a dielectric substrate 1 with a conductive groundplane 2 on its underside and a printed microstrip line 10 on its upper side.
  • the line 10 terminates in a 'fat' section 11, which is significantly wider then the main section of the line 10, so as to define a radiating section 11.
  • No groundplane 2 is provided under the radiating section 11.
  • An edge 12 of the groundplane 2 acts as a groundplane for the radiating section 11.
  • This antenna device has good bandwidth, but does not provide antenna diversity.
  • Figures 3 and 4 show a first preferred embodiment of the present invention, comprising a dielectric substrate 1 in the form of an FR4 or Duroid® PCB.
  • An underside of the substrate 1 is provided with a conductive groundplane 2 by metallization or any other suitable process, the groundplane 2 defining a first area of the substrate 1.
  • An end portion 13 of the underside of the substrate 1 is not provided with a groundplane 2, this defining a second area of the substrate 1.
  • An interface 14 is thus defined between the first and second areas of the substrate 1.
  • the interface 14 follows a generally straight line across the width of the substrate 1.
  • First and second microstrip feedlines 15, 16 extend across the first area from feed points 17, 18 towards the second area, the feedlines 15, 16 being formed on the topside of the substrate 1.
  • the feedlines 15, 16 run generally parallel to each other as they approach the second area, but as they cross the interface 14, the feedlines 15, 16 diverge at substantially 90 degrees to each other.
  • Two dielectric elements 19, 20 in the form of oblong ceramics pellets are soldered or otherwise mounted on the divergent feedlines 15, 16 in the second area.
  • the feedlines 15, 16 extend beyond the dielectric elements 19, 20 towards corners of the second area, thus defining tails or overhangs 21, 22.
  • the tails 21, 22 are bent towards each other, but in alternative embodiments the tails 21, 22 may be bent away from each other or may curve back towards the interface 14. This bending allows the antenna device as a whole to be made smaller, in particular the second area of the dielectric substrate.
  • the tails 21, 22 act as dielectrically-loaded monopole antennas for operation in a lower frequency band (in this case, 2.1 to 3.1 GHz at a -10 dB return loss level), while the dielectric elements 19, 20 act as HDAs for operation in a higher frequency band (in this case, 4.9 to 6.1 GHz at a -10 dB return loss level).
  • a key feature of the invention in this embodiment is a gap or cut-out 23 formed in the groundplane 2 at the interface 14 and between the feedlines 15, 16.
  • the gap 23 is generally rectangular in shape, and extends into the first area.
  • the gap 23 serves to improve isolation between the two antennas formed by the respective tails 21, 22 and dielectric elements 19, 20.
  • the gap 23 extends a predetermined distance from the interface 14 to a base 100 of the gap 23.
  • the antenna device of Figures 3 and 4 has been designed to cover the Bluetooth®/802.11g WLAN band at 2.4 GHz and all the high frequency 802.11a WLAN bands between 4.9 and 5.9 GHz.
  • the technology is equally applicable to mobile phones or any other device requiring diversity and/or dual band functionality. Diversity is required to combat the multipath problem and is particularly needed when high data transmission rates are required.
  • Figure 5 shows an alternative embodiment, like parts being labelled as for Figures 3 and 4.
  • the key difference is that, instead of a gap or cut-out being formed in the groundplane 2 at the interface 14 on the underside of the substrate 1, a set of three projections 24 is provided, the projections 24 having a castellated or crenellated configuration.
  • the projections 24 extend into the second area from the first area on the underside of the substrate 1, and are located between the feedlines 15, 16 located on the topside of the substrate 1.
  • the projections 24 serve to improve isolation between the two antennas formed by the respective tails 21, 22 and dielectric elements 19, 20.
  • the lengths of the tails 21, 22 may be increased so as to enable operation at lower frequencies in the lower band, for example to cover UMTS or GSM1800 bands. In some embodiments, additional lengths of feedline may be switched in or out of the tails 21, 22, for example by using PIN diode switches (not shown).
  • PIN diode switches not shown.
  • FIG. 6 Also shown in Figure 6 are the measured S 12 isolation between the antennas (line 29) and the upper band isolation from the simulation (line 30). There is very good isolation between the antennas in both the 2.4 GHz Bluetooth/802.1 lg band and the 5-6 GHz 802.1 la bands.
  • the antennas have good gain and efficiency. In the lower band the gain is of the order of 2 dBi and in the upper band it is nearer 5 dBi. The efficiency is over 80%.
  • FIG. 7 to 10 A further alternative embodiment is shown in Figures 7 to 10, with like parts being labelled as for the previous Figures.
  • an additional groundplane 2' on the topside of the substrate.
  • the additional groundplane 2' does not extend towards the end of the substrate 1 as far as the groundplane 2 on the underside, but terminates on the topside at a line corresponding to the location of the base 100 of the gap 23 formed in the groundplane 2 on the underside.
  • a groundplane extension 25 is provided, which extends from the base 100 of the gap 23, but not touching the sides of the gap 23, to the edge of the underside of the substrate 1, and then returns back on itself on the topside of the substrate 1 to a point corresponding to a point just past the line of the interface 14.
  • the feedlines 15, 16 on the topside are insulated from the additional groundplane 2', for example by being formed between the topside and the underside of the substrate 1, only moving up to the topside by way of vias 101 near the interface 14, and are provided with dielectric elements 19, 20 which are slightly shorter than those of the embodiments of Figures 4 and 5.
  • tails 21, 22 extend beyond the dielectric elements 19, 20 to act as dielectrically-loaded monopole antennas.
  • the tails 21, 22 in this embodiment have a zig-zag configuration, which allows the tails 21, 22 to have a greater length in the space available than if the tails were straight.
  • This embodiment is particularly useful in PCMCIA applications, since the feedlines 15, 16 can be isolated from a PCMCIA chassis by way of being sandwiched between the groundplanes 2, 2'.
  • the gap 23 and the extension 25 serve to provide improved isolation between the antenna elements 19, 21 and 20, 22 respectively.
  • the return loss and isolation between the antenna pair 19, 21 & 20, 22 can be seen in Figure 11.
  • the antenna device as a whole has good coverage of both the WLAN 802.1 lb band at 2.4 GHz and the 802.11 a band at 5-6 GHz.
  • Figure 12 shows a fourth embodiment of the present invention, comprising an antenna device including a dielectric substrate 1 having a first, upper surface and a second, lower surface, a conductive groundplane 2 on the second surface, and first and second conductive feedlines 15, 16 formed on the first surface and extending from feed points 102 in the first area on the first surface (located above the groundplane 2) to the second area of the first surface (located above regions with no groundplane).
  • a groundplane extension 30 extends from the interface 14 on the second surface towards an edge 31 of the substrate 1.
  • Two dielectric elements 19, 20, here in the form of low-profile squares of dielectric ceramics material, are provided on the first surface over the blank parts of the second surface (i.e. where there is no groundplane 2).
  • the feedlines 15, 16 pass under the dielectric elements 19, 20 on the first surface, and are arranged orthogonal to each other at these points for maximum polarisation diversity.
  • Two conductive plates or patches 32, 33 are provided on the second surface, located directly beneath the dielectric elements 19, 20 and having a similar size and shape.
  • the conductive plates or patches 32, 33 each have a central slot or aperture 34, 35, the slots also being arranged orthogonal to each other.
  • the feedlines 15, 16 are configured so as to cross over the slots 34, 35 generally orthogonal thereto, the feedlines 15, 16 and the dielectric elements 19, 20 being on the first surface of the substrate 1 and the groundplane 2, groundplane extension 30 and the patches 32, 33 being on the second surface of the substrate 1.
  • the slots 34, 35 radiate in one frequency band, and the patches 32, 33 radiate in a second frequency band, thus providing dual band operation.
  • the dielectric elements 19, 20 serve as dielectric loads for both the slots 34, 35 and the patches 32, 33, thereby allowing the antenna as a whole to be more compact.
  • a low profile antenna device can be constructed, which is particularly advantageous in PCMCIA card applications.
  • Figure 13 shows the return loss performance of the antenna device of Figure 12, demonstrating excellent dual band operation.

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  • Computer Networks & Wireless Communication (AREA)
  • Computer Hardware Design (AREA)
  • General Engineering & Computer Science (AREA)
  • Waveguide Aerials (AREA)

Abstract

L'invention concerne un dispositif d'antenne comprenant un substrat diélectrique (1) avec une première et une seconde surfaces opposées. Un plan de masse conducteur (2) est formé dans une première zone de la seconde surface du substrat (1), en laissant vierge une seconde zone de la seconde surface. Au moins deux lignes d'alimentation (15, 16) formées sur la première surface du substrat (1) partent d'une zone correspondant à la première zone de la second surface et vont à une zone correspondant à la seconde zone de la seconde surface. Chacune des lignes d'alimentation (15, 16) est équipée d'un élément diélectrique (19, 20) dans la zone correspondant à la seconde zone de la seconde surface, et au moins une encoche ou discontinuité (23, 24, 25) est formée dans le plan de masse conducteur (2) à l'interface des première et seconde zones dans une région comprise entre les lignes d'alimentation (15, 16). Le dispositif d'antenne fonctionne bien en double bande avec une bonne diversité et une bonne isolation entre éléments d'antenne.
PCT/GB2004/002133 2003-05-19 2004-05-18 Antenne double bande avec diversite WO2004105182A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB0311361.0 2003-05-19
GBGB0311361.0A GB0311361D0 (en) 2003-05-19 2003-05-19 Dual band antenna system with diversity

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WO2004105182A1 true WO2004105182A1 (fr) 2004-12-02

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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100951582B1 (ko) * 2007-11-02 2010-04-09 한양대학교 산학협력단 초광대역 다이버시티 안테나
EP2224539A1 (fr) * 2009-02-27 2010-09-01 Thomson Licensing Système d'antenne compact avec une diversité d'ordre 2
WO2010148856A1 (fr) * 2009-11-17 2010-12-29 中兴通讯股份有限公司 Antenne de diversité pour terminal mobile et terminal mobile correspondant
US8115686B2 (en) 2005-07-21 2012-02-14 Fractus, S.A. Handheld device with two antennas, and method of enhancing the isolation between the antennas
CN102576932A (zh) * 2011-10-28 2012-07-11 华为终端有限公司 一种天线和终端
US8514138B2 (en) 2011-01-12 2013-08-20 Mediatek Inc. Meander slot antenna structure and antenna module utilizing the same
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US8531337B2 (en) 2005-05-13 2013-09-10 Fractus, S.A. Antenna diversity system and slot antenna component
US8115686B2 (en) 2005-07-21 2012-02-14 Fractus, S.A. Handheld device with two antennas, and method of enhancing the isolation between the antennas
US8810458B2 (en) 2005-07-21 2014-08-19 Fractus, S.A. Handheld device with two antennas, and method of enhancing the isolation between the antennas
US8362960B2 (en) 2005-07-21 2013-01-29 Fractus, S.A. Handheld device with two antennas, and method of enhancing the isolation between the antennas
KR100951582B1 (ko) * 2007-11-02 2010-04-09 한양대학교 산학협력단 초광대역 다이버시티 안테나
EP2224539A1 (fr) * 2009-02-27 2010-09-01 Thomson Licensing Système d'antenne compact avec une diversité d'ordre 2
CN101820096A (zh) * 2009-02-27 2010-09-01 汤姆森特许公司 具有2阶分集的紧凑型天线系统
FR2942676A1 (fr) * 2009-02-27 2010-09-03 Thomson Licensing Systeme d'antennes compact a diversite d'ordre 2.
KR20100098300A (ko) * 2009-02-27 2010-09-06 톰슨 라이센싱 다이버시티 차수가 2인 소형 안테나 시스템
JP2010206795A (ja) * 2009-02-27 2010-09-16 Thomson Licensing ダイバーシティ次数２の小型アンテナシステム
KR101689801B1 (ko) * 2009-02-27 2016-12-26 톰슨 라이센싱 다이버시티 차수가 2인 소형 안테나 시스템
WO2010148856A1 (fr) * 2009-11-17 2010-12-29 中兴通讯股份有限公司 Antenne de diversité pour terminal mobile et terminal mobile correspondant
US8514138B2 (en) 2011-01-12 2013-08-20 Mediatek Inc. Meander slot antenna structure and antenna module utilizing the same
WO2012097623A3 (fr) * 2011-10-28 2012-09-13 华为终端有限公司 Antenne et terminal
WO2012097623A2 (fr) * 2011-10-28 2012-07-26 华为终端有限公司 Antenne et terminal
CN102576932A (zh) * 2011-10-28 2012-07-11 华为终端有限公司 一种天线和终端
DE102013100731A1 (de) * 2012-09-26 2014-04-17 Mediatek Singapore Pte. Ltd. Kommunikationsgerät und Antennen mit hohen Isolationseigenschaften
US8922448B2 (en) 2012-09-26 2014-12-30 Mediatek Singapore Pte. Ltd. Communication device and antennas with high isolation characteristics
DE102013100731B4 (de) 2012-09-26 2018-10-11 Mediatek Singapore Pte. Ltd. Kommunikationsgerät und Antennen mit hohen Isolationseigenschaften

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