EP2028717B1 - Mehrbandantennenanordnung angeordnet auf einem dreidimensionalen Substrat - Google Patents

Mehrbandantennenanordnung angeordnet auf einem dreidimensionalen Substrat Download PDF

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Publication number
EP2028717B1
EP2028717B1 EP07114887A EP07114887A EP2028717B1 EP 2028717 B1 EP2028717 B1 EP 2028717B1 EP 07114887 A EP07114887 A EP 07114887A EP 07114887 A EP07114887 A EP 07114887A EP 2028717 B1 EP2028717 B1 EP 2028717B1
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EP
European Patent Office
Prior art keywords
antenna
face
segment
segments
band
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EP07114887A
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English (en)
French (fr)
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EP2028717A1 (de
Inventor
Geyi Wen
Qinjiang Rao
Mark Pecen
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BlackBerry Ltd
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Research in Motion Ltd
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Priority to EP07114887A priority Critical patent/EP2028717B1/de
Priority to AT07114887T priority patent/ATE534164T1/de
Publication of EP2028717A1 publication Critical patent/EP2028717A1/de
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Publication of EP2028717B1 publication Critical patent/EP2028717B1/de
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
    • H01Q9/04—Resonant antennas
    • H01Q9/30—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
    • 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
    • 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 generally to an antenna construction for a mobile station, or other radio device, operable over multiple frequency bands. More particularly, the present invention relates to antenna apparatus, and an associated methodology for forming a hybrid strip antenna of a multi-mode mobile station, or other radio device, operable, e.g., at the 800/900/1800/1900/2100 MHz frequency bands.
  • the antenna includes radiation elements comprising a strip including an impedance matching element disposed upon the external surfaces of a three-dimensional rectilinear substrate, such as a parallelepiped, cube, or pyramidal frustum.
  • the length of the strip is chosen to efficiently transduce RF energy in at least one frequency band of as many as four or more frequency bands. Since a relatively long strip antenna is wound around a very compact substrate, the antenna is of compact dimensions and exhibits stable and relatively wide resonant frequency band characteristics and radiation patterns.
  • Radio communication systems In modem society, the ready availability and access to mobile radio communication systems through which to communicate is a practical necessity.
  • Cellular, and cellular-like, communication systems are exemplary radio communication systems whose infrastructures have been widely deployed and regularly utilized by many.
  • Successive generations of cellular communication systems have been developed, and their operating parameters and protocols are set forth in standards promulgated by standard-setting bodies. And, successive generations of network apparatus have been deployed, each operable in conformity with an associated operating standard.
  • Early-generation cellular communication systems provided voice communication services and limited data communication services.
  • Successor-generation, cellular communication systems provide increasingly data-intensive communication services.
  • Differing operating standards not only provide different communication capabilities, but utilize different communication technologies and differing frequencies of operation in different frequency bands.
  • the installation of different types of cellular communication systems is sometimes geographically dependent. That is to say, in different areas, network infrastructures, operable pursuant to different types of operating standards, are deployed. The network infrastructures deployed in the different areas are not necessarily compatible.
  • a mobile station operable to communicate by way of network infrastructure constructed in conformity with one operating specification is not necessarily operable to communicate by way of network infrastructure operable pursuant to another operating standard.
  • multi-mode mobile stations have been developed that provide the mobile station with communication capability in more than one, i.e., multiple, communication systems, which also operate at different frequencies in different frequency bands.
  • multi-mode mobile stations automatically select the manner by which the mobile station is to be operable, responsive to the detected network infrastructure in whose coverage area that the mobile station is positioned. If positioned in the coverage area of the network infrastructures of more than one type of communication system with which the mobile station is capable of communicating, selection of a network infrastructure through which to communicate is made pursuant to a preference scheme, or manually.
  • the mobile station When provided with multi-mode capability, the mobile station contains circuitry and circuit elements permitting its operation to communicate pursuant to each of the communication systems.
  • a multi-mode mobile station is formed of separate circuitry, separately operable to communicate pursuant to the different operating standards.
  • circuit elements of the different circuit paths can be shared, parts of the separate circuit paths are constructed to be intertwined, or otherwise shared.
  • Sharing of antenna transducer elements between the different circuit paths presents unique challenges. The required size of an antenna transducer element is, in part, dependent upon the frequencies of the signal energy that is to be transduced by the transducer element.
  • antenna transducer design becomes increasingly difficult, particularly in multi-mode mobile stations when the different modes operate at different frequencies.
  • Significant effort has been exerted to construct an antenna transducer, operable over multiple frequency bands, and also of small dimension to permit its positioning within the housing of a mobile station of compact size.
  • a PIFA Planar Inverted-F Antenna
  • PIFA antennas have narrow bandwidths.
  • the structure of the PIFA is sometimes combined together with a parasitic element, or a multi-layered, three-dimensional structure.
  • Such additions however, increase the volumetric dimensions of the antenna, as well as its weight.
  • the additional resonant branches make the antenna difficult to tune and sometimes introduce EMC and EMI, which interferes with transducing of signal energy.
  • US 2002/145,569 discloses an antenna apparatus that includes a dielectric base, and a plurality of feeding-radiating elements having different resonance frequencies, each element including a feeding electrode and a radiating electrode which are deposed on surfaces of the base.
  • a stub with a common feeding point is disposed on a mounting substrate which supports the base.
  • WO 2006/073034 A1 discloses, in an antenna structure, a radiant power supply electrode disposed on a dielectric base performs antenna operations of a basic mode, and also a high-order mode exhibiting a higher resonance frequency than the basic mode.
  • the electrode has a supply end and an open end, between which a capacitive loading part is positioned.
  • a capacitive loading conductor is junctioned to one or both of the power supply end and the capacitive loading part.
  • US2005/0156790 discloses a broadband antenna that includes a conducting ground plate, on which a three-dimensional member rests.
  • a radiating conductor is stuck or printed on the 3D member in such a manner that at least part of the radiating conductor is opposite to at least part of the ground plate.
  • a wavelength shortening effect is achieved by the interposition of the 3D member between the opposite parts of the ground plate and the radiating conductor.
  • US2004/0125032 A1 discloses a surface-mount antenna that includes a rectangular parallelepiped base body, a feeding terminal formed on the body, and a radiating electrode. One end of the electrode is connected to the feeding terminal, and the other end routed around side surfaces of the base body to eventually form an open end.
  • EP 1 414 108 A2 discloses a surface-mount antenna that includes a loop-shaper radiation electrode arranged so as to be extended over a plurality of surfaces of a dielectric substrate. One side of the loop-shape radiation electrode is branched to provide a plurality of branched radiation electrodes 8A, 8B.
  • EP 1 198 027 A1 discloses a small antenna having an antenna conductor with a first meander part formed in such a manner to meander in a second direction different from the first direction. One end of the first meander part is connected to one end of the second meander part.
  • EP 1 195 845 A2 discloses a miniaturized antenna with at least a ceramic substrate and a metallization, particularly designed for use in the high-frequency and microwave ranges.
  • EP 1 414 108 A2 discloses a surface mount antenna including a loop-shaped electrode arranged so as to be extended over a plurality of surfaces of a dielectric substrate.
  • Figure 1 illustrates a functional block diagram of a radio communication system in which an embodiment of the present invention is operable.
  • Figure 2 illustrates a perspective view of an embodiment of the present invention.
  • Figure 3 illustrates a close-up perspective view of the embodiment depicted in Figure 2 .
  • Figure 4 illustrates another close-up perspective view of the embodiment depicted in Figure 2 but viewed from a different direction than shown in Figure 3 .
  • Figure 5 illustrates a plan view of the antenna depicted in Figure 2 with the faces of the substrate unfolded and depicting antenna current flow in the two low or fundamental frequency bands of 800 and 900 MHz.
  • Figure 6 illustrates a plan view of the antenna depicted in Figure 2 with the faces of the substrate unfolded as in Figure 5 but instead depicting antenna current flow in the high fundamental frequency bands of 1800 and 1900 MHz.
  • Figures 7A and 7B illustrate radiation patterns of the antenna shown in Figure 2 in two orthogonal planes, at two different frequencies.
  • Figure 8 illustrates a plot of the antenna's return loss as a function of an input signal frequency.
  • Figure 9 illustrates a method flow diagram in accordance with an embodiment of the present invention.
  • the present invention accordingly, advantageously provides compact, lightweight antenna apparatus, and an associated method, for a mobile station, or other radio device, operable over multiple frequency bands.
  • a manner is provided by which to form a hybrid strip antenna of a multi-mode mobile station, or other radio device, operable, e.g., at the 800/900/1800/1900 MHz frequency bands.
  • an antenna for a multi-mode mobile station is formed of a cube-shaped dielectric antenna substrate, the surfaces of which carry an end-fed antenna strip, formed of a strip of metal or other conductive material having a length, width and thickness.
  • the length of the strip is much longer than the dimensions of any one face of the antenna substrate, requiring the strip to be folded at least part way over different faces of the antenna substrate. In other words, the length of the antenna strip is multiples of the dimensions of any one face of the cube.
  • the antenna includes a feed point at one end of the strip and a "T"-shaped impedance matching/adjustment element at the end of the strip opposite the feed point.
  • the cube dimensions and the length and width of the radiation element are selected so that the radiation element can be "folded” across or “wrapped” around several faces of the cube without the radiation element overlapping itself and without the edges of the radiation element abutting each other.
  • the cube dimensions are also selected so that the cube can fit within the housing of a mobile station.
  • the length of the strip forming the antenna element was approximately one-quarter the wavelength of a signal in the 800 MHz frequency band, and it effectuated resonance in both the 800 and 900 MHz bands.
  • the antenna was also resonant in the 1800, 1900 and 2100 MHz bands.
  • the strip forming the radiation element can be thought of, and also described as, several different substantially equallength conductive segments that are electrically connected to each other in series. Successive segments are joined to each other on the cube face such that each segment's length dimension is orthogonal to the length dimension of adjacent segments. In the embodiments shown, each cube face supports more than one antenna segment. The impedance matching element at the terminus end of the strip is also folded across cube faces.
  • the antenna is advantageously utilized in a mobile station, or other radio device, of small volumetric dimensions.
  • a folded strip antenna and an associated methodology is provided for a multi-band communication device.
  • the folded strip antenna is embodied by forming a dielectric material into the shape of a cube.
  • a radiation element such as a thin, flat metal strip, has a length and width such that the strip can be folded to extend at least part way across several of the different faces of the cube.
  • a radio communication system shown generally at 10, provides for radio communications with mobile stations, of which the mobile station 12 is representative.
  • the mobile station 12 is here representative of a quad-mode mobile station, capable of communicating at the 800/900/1800/1900 MHz frequency bands.
  • Such a mobile station is sometimes referred to as a world-band mobile station as the mobile station is operable in conformity with the operating specifications and protocols of the cellular communication systems that presently are predominant.
  • the mobile station is representative of various radio devices that are operable over multiple bands or large bandwidths at relatively high frequencies.
  • Radio access networks 14, 16, 18, and 22 are representative of four radio networks operable respectively at the 800, 900, 1800, and 1900 MHz frequency bands, respectively.
  • the mobile station 12 When the mobile station 12 is positioned within the coverage area of any of the radio access networks 14-22, the mobile station is capable of communicating therewith. If the separate networks have overlapping coverage areas, then the selection is made as to which of the networks through which to communicate.
  • the radio access networks 14-22 are coupled, here by way of gateways (GWYs) 26 to a core network 28.
  • GWYs gateways
  • CE communication endpoint
  • the mobile station 12 includes a radio transceiver having transceiver circuitry 36 capable of transceiving communication signals with any of the networks 14-22.
  • the transceiver circuitry includes separate or shared transceiver paths constructed to be operable with the operating standards and protocols of the respective networks.
  • the radio station further includes an antenna 50 of an embodiment of the present invention.
  • the antenna is of characteristics to be operable at the different frequency bands at which the transceiver circuitry and the radio access networks are operable.
  • the antenna 50 is operable at the 800, 900, 1800, and 1900 MHz frequency bands.
  • the antenna 50 is housed together with the transceiver circuitry, in a housing 44 of the mobile station. As the space within the housing that is available to house the antenna is limited, the dimensions of the antenna 50 are correspondingly small while providing for the transducing of signal energy by the antenna over broad frequencies at which the mobile station is operable.
  • FIG 2 illustrates an exemplary implementation of a multi-band strip antenna 50 for the multi-band communications device 12, depicted in Figure 1 .
  • the multi-band strip antenna 50 is comprised of a dielectric antenna substrate 52 having the shape of right rectangular parallelepiped but which is also accurately described as a type of three-dimensional rectilinear body.
  • the parallelepiped-shaped antenna substrate 52 shown in Figure 2 is more commonly known as a cube, which of course has six rectangular, i.e., square, sides, denominated here as a top face 64, bottom face 66 and four side faces 68, 70, 72 and 74 that extend between corresponding edges of the top face 64 and bottom face 66.
  • the top face 64 and bottom face 66 are planar or at least substantially planar and lie in corresponding parallel but spaced-apart geometric planes, the separation distance of which defines the height, H, of the cube.
  • the side faces 68, 70, 72 and 74 of the antenna substrate 52 are also planar or substantially planar and orthogonal to the top face 64 and the bottom face 66 with faces adjacent to each other also being orthogonal to each other.
  • the antenna 50 is depicted atop a substantially planar dielectric supporting substrate 76 to which a metal ground plane 78 is also attached.
  • the ground plane 78 acts to shield circuitry of the device 12 from signals emitted from the antenna as well as electromagnetic interference or EMI from external sources.
  • the ground plane 78 also shapes the radiation pattern of the antenna 50.
  • a three-dimensional rectilinear antenna substrate 52 depicted is fabricated as a solid piece of molded dielectric material, in which case, the substrate will of course have multiple sides. A cube-shaped substrate 52 will have six sides. In embodiments where the antenna substrate 52 is solid, the bottom face 66 of the substrate 52 will abut a surface of the supporting substrate 76 when the antenna substrate 52 is mounted atop a supporting substrate 76. Since a solid substrate 52 will add weight and cost, in at least one other embodiment, the three-dimensional rectilinear antenna substrate 52 is not solid but is instead constructed from one or more separate panels of dielectric material that is folded into a desired shape for the antenna substrate 52. In yet another embodiment, the parallelepiped is constructed from several separate discrete panels affixed to each other. Various well-known methods of attachment can be used including, but not limited to, adhesives, heat, ultrasonic welding or mechanical fasteners.
  • a cube-shaped antenna substrate 52 can have either five or six sides, the construction of which is referred to herein as being a panelized substrate.
  • a panelized antenna substrate 52 such as a cube-shaped substrate is constructed to have only five sides and which is then mounted to a separate supporting substrate 76
  • the portion of the supporting substrate 76 that is directly below the hollow antenna substrate 52 is then considered to be a de facto "side" of the antenna substrate 52.
  • the portion of the supporting substrate 76 directly below the antenna substrate 52 is considered herein to be the "bottom" face 66 of the parallelepiped antenna substrate 52.
  • Figure 3 is a close-up, perspective view of the embodiment of the multi-band antenna 50 depicted in Figure 2 , showing in greater detail how the antenna 50 depicted in Figure 2 is constructed using a three-dimensional rectilinear body as an antenna substrate 52.
  • a radiation element 80 of the antenna 50 is a single, elongated strip of metal or other conductive material folded around the faces 64-74 of a cube-shaped antenna substrate 52, except for the bottom face 66, to which the antenna substrate 52 is attached.
  • the strip that forms the radiation element 80 has a feed point 82, whereat radio frequency signals for transmission from the antenna 50 are introduced to the antenna 50 from a transmitter and whereat radio signals received by the antenna 50 are recovered from the antenna 50 by a receiver.
  • the feed point 82 is located at the edge 84 formed by the intersection of the bottom face 66 and one of the side faces 68.
  • the feed point 82 is located away from an edge, e.g., at the interior of the strip connecting the antenna and the ground plane.
  • the radiation element 80 has length, width and thickness, the length of which is chosen to be approximately one-quarter the wavelength of a signal in the antenna's fundamental band, e.g., the 800 Mhz band. As will be appreciated from the figures and description below, the length and width will determine the resonant frequencies and characteristic impedances of the antenna 50, however, the width of the strip is also chosen to allow the radiation element 80 to be folded over the faces of the parallelepiped-shaped substrate without having the segments overlap or abut each other.
  • a "T"-shaped impedance matching element 88 is located at the terminus end 90 of the strip.
  • the input impedance of the antenna 50 at the feed point 82 can thereby be adjusted by varying the length as well as the width of the impedance matching element 88.
  • the metal strip or strips forming the impedance matching element 88 are also disposed on one or more faces of the antenna substrate 52. In the embodiment shown, the impedance matching element 88 wraps over the top face 64 and two side faces 70 and 74.
  • Segments forming the radiation element 80 and segments forming the impedance matching element 88 can be over coated with a thin layer of insulative material (not shown).
  • a non-conductive, i.e., insulative material deposited over the segments can reduce or prevent oxidation of the segments, prevent the segments from being separated from surfaces of the antenna substrate 52 but also prevent the segments from being short circuited during or after installation of the antenna 50 into a mobile device 12.
  • Figure 4 is another close-up perspective view of the antenna 50 depicted in Figure 3 albeit from a different direction. Figure 4 therefore further illustrates how the metal strip forming the radiation element 80 and the impedance matching section 88 are wrapped around the parallelepiped shaped antenna substrate 52.
  • Figures 5 and 6 are plane views of the antenna depicted in Figure 2 albeit with the faces of the antenna substrate 52 unfolded with the radiation element 80 still on them.
  • Figure 5 differs from Figure 6 in that Figure 5 depicts antenna 50 current distributions in the 800 and 900 MHz bands whereas Figure 6 depicts current distributions of the same antenna in the 1800 and 1900 MHz. bands.
  • Figures 5 and 6 both show that the radiation element 80 can be considered to be several separate but electrically and physically contiguous elongated planar conductive segments, the segment end points of which being identified in the figures by the letters S, O, and A through L.
  • the various segments that comprise the radiation element 80 are therefore denominated as SA, AB, BC, CD, DE, EF, FG, GH, HI, IJ, JK, KL and LO.
  • the segments are connected to each other in series and extend between the feed point 82 of the antenna 50 and the impedance matching element 88 at the terminus end 90.
  • the sum of the lengths of all the segments SA, AB, BC, CD, DE, EF, FG, GH, HI, IJ, JK, KL, LO, including the length of at least one of segments OM or ON of the impedance matching element 88, are responsible for achieving low frequency band resonances, which for the mobile communications device shown in Figure 1 were 800 and 900 MHz bands.
  • a zero current point occurs at the geometric center point P of the antenna 50.
  • the geometric center point for the high frequency bands i.e., the 1800, 1900 and 2100 MHz bands will shift however along the EF at various different frequencies of operation.
  • the shifting zero current point P makes the current flow along the strips in the Y direction, i.e., strips IH and BC, and current flowing along the strips in the Z direction, i.e., strips DE and GF, HG and CD, JI and AB, KJ and SA, to be in-phase with respect to each other, resulting in high gain, uniform radiation patterns for the cube-shaped antenna 50, as depicted in Figures 7A and 7B .
  • segments of the radiation element 80 that are electrically and physically adjacent to each other in the concatenation of elements SA, AB, BC, CD, DE, EF, FG, GH, HI, IJ, JK, KL and LO, are also orthogonal to each other at their points of connection.
  • segment SA is connected to segment AB on the top surface 64.
  • segment CD which extends over a side face 70 as well as part way over the top surface 64.
  • segment CD is orthogonal to segment BC where they meet on the side face 70.
  • Segment CD is also orthogonal to segment DE where CD and DE meet on the top surface 64.
  • Figures 7A and 7B illustrate graphical representations of measured radiation patterns of the antenna 50 depicted in Figure 2 at both 912 MHz and 1946 MHz.
  • the antenna 50 has a radiation pattern in the ZX plane (as marked in Figures 2-4 ) which is a nearly perfect circle at 912 MHz.
  • the radiation pattern is also substantially circular at 1946 MHz.
  • Figure 7B shows that the antenna 50 has fairly good circular radiation patterns in the YZ plane, (as marked in Figures 2-4 ) at both 912 MHz and at 1946 MHz.
  • the radiation pattern emitted from the mobile communication device 12 can therefore be chosen to be at least one of those depicted in Figures 7A and 7B , by simply orienting the antenna substrate 52 within a mobile communications device 12 so that the ZX plane is parallel, orthogonal to or oriented in some other fashion to obtain a desired radiation pattern relative to the earth's surface.
  • FIG 8 there is shown a plot of the return-loss of the antenna 50 depicted in Figures 2-4 as a function of frequency.
  • the frequency of signal input to the antenna at the feed point 82 is plotted along the abscissa or X-axis 92.
  • the ordinate or Y-axis 94 is scaled in terms of return loss in decibels or dB.
  • the antenna 50 depicted in Figures 2-4 exhibits a pass band 96 between approximately 800 MHz and 900 MHz.
  • a second pass band 98 extends between approximately 1600 MHz and 2200 MHz.
  • the antenna will efficiently transduce RF signal energy anywhere within the pass bands 94 and 96.
  • the pass bands and their corresponding frequencies therefore define frequency bands wherein a multi-mode communications device can operate efficiently.
  • Figure 9 illustrates a method flow diagram, shown generally at 100, representative of a method of operation of an embodiment of the present invention.
  • the method provides for transducing signal energy at a radio device.
  • a three-dimensional rectilinear substrate is formed, such as the cube depicted in the figures described above.
  • a first radiation element is formed and deposited onto the surface of the substrate.
  • the radiation element is formed in the shape of an elongated, thin strip of metal or other conductive material.
  • the strip has a predetermined length, which is substantially equal to one-quarter the wavelength of the lowest frequency band at which the antenna will operate. It is important that the antenna strip be provided with a feed point, such as the one described above, whereat signal energy can be introduced to and obtained from the antenna.
  • the radiation element can be formed upon the faces of the antenna substrate by different methods. Such methods include but are not limited to, electro-plating, chemical vapor deposition or CVD or by adhesives.
  • the segments forming the radiation element and the surfaces of the antenna substrate are overcoated with a thin layer of dielectric material as indicated by step 106, which will protect the segments from oxidation as well as inadvertent short circuiting.
  • radio frequency signal energy is then transduced within first, second, third or fourth sets of frequency bands at which the radiation element is resonant.
  • the antenna 50 described above defines a strip antenna of small dimensions and which is easily positioned within the housing of a compact mobile station.
  • the antenna enables a mobile station to operate on multiple frequency bands, including the quad-bands of a quad-mode mobile station operable at the 800/900/1800/1900 MHz frequency bands, however, the foregoing description should not be construed as limiting because the inventive concept extends to antenna substrates that are not necessarily cube-shaped.
  • the antenna substrate 52 in the shape of a cube having the radiation element 80 around its faces a more general description of the antenna 50 is that the antenna is formed from a substrate 52 in the shape of any three-dimensional rectilinear dielectric body.
  • a radiation element 80 is disposed on, i.e., wrapped around, multiple sides of the body, with the possible exception of one face on which the substrate is attached to a supporting substrate or mobile unit.
  • the antenna substrate 52 and the radiation element 80 are sized together so that it can fit within the small and confined spaces of a multi-band mobile unit 12 yet transduce radio frequency energy in multiple different frequency bands.
  • Three-dimensional rectilinear bodies that are usable to form an antenna include but are not limited to, truncated prisms and truncated pyramids, and parallelepipeds generally, e.g., cubes and cuboids, whether such bodies are solid or hollow.
  • a truncated prism is considered to be any polyhedron with two polygonal faces lying in parallel planes and with the other faces that connect the two polygonal faces being parallelograms.
  • the polygonal faces can include regular polygons such as triangles, squares, rectangles, pentagons, octagons as well as irregular polygons.
  • the parallelogram sides can include rectangles and squares. In such a body, the two polygonal faces may or may not correspond to the top face 64 and the bottom face 66 of the cube described above.
  • a pyramid is of course a polyhedron having for its base a polygon and faces that are triangles with a common vertex.
  • a truncated pyramid is therefore a pyramid with a top portion that is removed to provide a flat top in the shape of a regular polygon.
  • the sides of a truncated pyramid are trapezoidal.
  • the shape of the bottom face and the shape of the top face will be the same but with the bottom face being larger than the top.
  • the slope or inclination of the sides is a design choice and can vary from just over 90 degrees to virtually any angle.
  • the antenna disclosed herein significantly reduces the physical size or extension of a multi-band antenna while also increasing the bandwidth of the antenna. Increasing bandwidth is equivalent to reducing the energy stored around the antenna.
  • the compact size of the three-dimensional wrapped antenna also lends itself to use in multiple antenna systems, including multiple input and multiple output (MIMO) antenna systems. Because of their size, prior art antennas cannot be used to implement a MIMO antenna system in a portable communications device.
  • MIMO multiple input and multiple output

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Claims (7)

  1. Mehrfachband-Streifen-Antenne (50) für eine Kommunikationsvorrichtung (12), wobei die Antenne (50) aufweist:
    ein Kubus-förmiges Antennensubstrat (52) mit einer planaren Oberseite (64), einer planaren Unterseite (66), die parallel zu der Oberseite (64) angeordnet ist, und einer Vielzahl von planaren Seitenflächen (68, 70, 72, 74) und mit einer Kantenlänge;
    ein Ausstrahlungselement (80), das auf dem Kubus-förmigen Antennensubstrat (52) außer auf der Unterseite (66) angeordnet ist, und
    gebildet wird aus einer Vielzahl von länglichen leitenden Segmenten, die in Serie verknüpft und miteinander galvanisch gekoppelt sind, wobei die kombinierten Längen der Segmente als im Wesentlichen gleich einem Viertel der Wellenlänge eines niedrigsten Frequenzbands von zwei verschiedenen Frequenzbändern ausgewählt sind, in denen die Streifen-Antenne arbeiten kann;
    wobei das Ausstrahlungselement neun gleichlange Segmente aufweist, die an den vier Seitenflächen angeordnet sind, wobei drei Segmente an der ersten Seitenfläche angeordnet sind, und zwei Segmente an jeder der anderen Seitenflächen angeordnet sind, wobei alle Segmente eine Länge haben, die nicht länger ist als die Kantenlänge des Kubus, und wobei alle diese Segmente im Wesentlichen parallel zu den Kanten sind, die durch die Seitenflächen definiert werden;
    einen Ausstrahlungselementzufuhrpunkt (82), der an einem ersten Ende (S) eines ersten leitenden Segments, das nicht das mittlere Segment ist, an der ersten Seitenfläche angeordnet ist, wobei sich der Zufuhrpunkt (82) an der Kante zwischen der Unterseite (66) und einer ersten Seitenfläche (68) befindet;
    wobei jede Seitenfläche (68, 70, 72, 74) weiter daran angeordnete Verbindungselemente aufweist, ein Verbindungselement zwischen zwei Segmenten an der ersten Seitenfläche (68), die nicht das Segment enthalten, an dem sich der Zufuhrpunkt (82) befindet, wobei die Verbindungselemente an den anderen Seitenflächen (70, 72, 74) die anderen daran vorhandenen Segmente verbinden, wobei sich alle Verbindungselemente neben den Kanten befinden, die durch die Unterseite (66) definiert werden;
    wobei die Segmente der Oberseite (64) weiter vier 90-Grad-Biegungen aufweisen, wobei eine erste 90-Grad-Biegung das Segment, an dem sich der Zufuhrpunkt (82) befindet, mit dem Segment auf der zweiten Seite (70) verbindet, das sich am nächsten zu der ersten Seite (68) befindet, wobei eine zweite 90-Grad-Biegung das andere Segment, das sich auf der zweiten Seite (70) befindet, mit dem Segment auf der dritten Seitenfläche (72) verbindet, das sich am nächsten zu der zweiten Seitenfläche (70) befindet,
    wobei eine dritte 90-Grad-Biegung das andere Segment, das sich auf der dritten Seite (72) befindet, mit dem Segment auf der vierten Seite (74) verbindet, das sich am nächsten zu der dritten Seite (72) befindet, wobei eine vierte 90-Grad-Biegung das andere Segment, das sich auf der vierten Seite (72) befindet, mit dem Segment auf der ersten Seite (68) verbindet,
    das sich am nächsten zu der vierten Seite (72) befindet;
    ein Impedanzanpassungselement (88), das sich auf der Oberseite (64) befindet, das mit dem mittleren Segment verbunden ist, das sich auf der ersten Seite (68) befindet, wobei das Impedanzanpassungselement zwei Segmente aufweist, wobei das erste Segment parallel ist zu den Kanten der Oberseite (64) mit der zweiten (70) und vierten (74) Seitenfläche, und
    eine geringere Länge hat als die Kantenlänge des Kubus-geformten Substrats (52), wobei das zweite Segment des
    Impedanzanpassungselements eine größere Länge hat als die Kantenlänge, wobei das zweite Segment des
    Impedanzanpassungselements in der Mitte und orthogonal zu dem ersten Segment des Impedanzanpassungselements verbunden ist, wobei sich das zweite Segment des Impedanzanpassungselements von der Oberseite (64) auf die zweite (70) und vierte (74) Seitenfläche erstreckt; und
    einen geometrischen Mittelpunkt (P) des Ausstrahlungselements, an dem ein Null-Strom-Punkt an einem höchsten Frequenzband von zwei verschiedenen Frequenzbändern für die Antenne co-positioniert ist.
  2. Streifen-Antenne (50) gemäß Anspruch 1, die weiter eine isolierende Schicht aufweist, die aufgebracht ist über zumindest einem aus: dem Ausstrahlungselement (80) und dem Impedanzanpassungselement (88).
  3. Streifen-Antenne (50) gemäß Anspruch 1, wobei die Streifen-Antenne (50) erste und zweite Passbandfrequenzen hat, wobei die erste Passbandfrequenz aus dem 800-Mhz-Band und dem 900-Mhz-Band ausgewählt ist und die zweite Passbandfrequenz aus dem 1800-Mhz-Band und dem 1900-Mhz-Band ausgewählt ist.
  4. Streifen-Antenne (50) gemäß Anspruch 1, wobei die Streifen-Antenne (50) eine erste Passbandfrequenz hat, die in dem 800-Mhz-Band und dem 900-Mhz-Band ausgewählt ist, und eine zweite Passbandfrequenz hat, die in dem 1800-Mhz-Band und dem 1900-Mhz-Band ausgewählt ist.
  5. Streifen-Antenne (50) gemäß Anspruch 1, wobei das Ausstrahlungsmuster, das von der Antenne (50) in dem 900-Mhz-Band ausgestrahlt wird, im Wesentlichen kreisförmig ist, in zumindest einer Ebene einer Ausrichtung des Antennensubstrats.
  6. Verfahren zum Übermitteln von Kommunikationssignalen zwischen einer mobilen Station (12) mit einem Funktransceiver und einem Netzwerk (14, 16, 18, 22), wobei das Verfahren die Schritte aufweist:
    Übermitteln (108) von Funkfrequenzsignalenergie an dem Zufuhrpunkt (82) einer Mehrfachband-Streifen-Antenne (50) gemäß Anspruch 1.
  7. Verfahren gemäß Anspruch 6, das weiter umfasst den Schritt eines Übermittelns (108) von Funkfrequenzenergie in zumindest einem von zumindest ersten und zweiten Frequenzbändern, an denen das Ausstrahlungselement resonant ist.
EP07114887A 2007-08-23 2007-08-23 Mehrbandantennenanordnung angeordnet auf einem dreidimensionalen Substrat Active EP2028717B1 (de)

Priority Applications (2)

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EP07114887A EP2028717B1 (de) 2007-08-23 2007-08-23 Mehrbandantennenanordnung angeordnet auf einem dreidimensionalen Substrat
AT07114887T ATE534164T1 (de) 2007-08-23 2007-08-23 Mehrbandantennenanordnung angeordnet auf einem dreidimensionalen substrat

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CN105244597B (zh) * 2015-09-16 2018-06-26 南京信息工程大学 一种三频段手机天线
CN105406187B (zh) * 2015-12-16 2018-09-25 南京信息工程大学 一种双频段立体倒f天线
CN213460090U (zh) * 2020-07-10 2021-06-15 瑞声科技(新加坡)有限公司 一种叠层天线及终端设备

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DE10049844A1 (de) 2000-10-09 2002-04-11 Philips Corp Intellectual Pty Miniaturisierte Mikrowellenantenne
DE60120069T2 (de) 2000-10-12 2006-12-21 The Furukawa Electric Co., Ltd. Miniaturisierte Antenne
JP2002314330A (ja) * 2001-04-10 2002-10-25 Murata Mfg Co Ltd アンテナ装置
JP3666600B2 (ja) 2002-04-12 2005-06-29 ソニー株式会社 広帯域アンテナ装置
JP3931866B2 (ja) 2002-10-23 2007-06-20 株式会社村田製作所 表面実装型アンテナおよびそれを用いたアンテナ装置および通信装置
JP3825400B2 (ja) 2002-12-13 2006-09-27 京セラ株式会社 アンテナ装置
WO2006073034A1 (ja) * 2005-01-05 2006-07-13 Murata Manufacturing Co., Ltd. アンテナ構造およびそれを備えた無線通信機

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ATE534164T1 (de) 2011-12-15

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