EP2763235A1 - Ensembles d'antenne avec éléments d'antenne en boucle conique - Google Patents

Ensembles d'antenne avec éléments d'antenne en boucle conique Download PDF

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Publication number
EP2763235A1
EP2763235A1 EP14153878.5A EP14153878A EP2763235A1 EP 2763235 A1 EP2763235 A1 EP 2763235A1 EP 14153878 A EP14153878 A EP 14153878A EP 2763235 A1 EP2763235 A1 EP 2763235A1
Authority
EP
European Patent Office
Prior art keywords
antenna assembly
antenna
support
configuration
antenna element
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.)
Withdrawn
Application number
EP14153878.5A
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German (de)
English (en)
Inventor
Richard E. Schneider
John Edwin Ross
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Antennas Direct Inc
Original Assignee
Antennas Direct Inc
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
Priority claimed from US13/759,750 external-priority patent/US8994600B2/en
Application filed by Antennas Direct Inc filed Critical Antennas Direct Inc
Publication of EP2763235A1 publication Critical patent/EP2763235A1/fr
Withdrawn legal-status Critical Current

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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
    • H01Q1/1207—Supports; Mounting means for fastening a rigid aerial element
    • H01Q1/1221—Supports; Mounting means for fastening a rigid aerial element onto a wall
    • 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
    • H01Q1/125—Means for positioning
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q19/00—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic
    • H01Q19/10—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic using reflecting surfaces
    • H01Q19/106—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic using reflecting surfaces using two or more intersecting plane surfaces, e.g. corner reflector antennas
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q7/00—Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop

Definitions

  • the present disclosure generally relates to antenna assemblies configured for reception of television signals, such as high definition television (HDTV) signals.
  • television signals such as high definition television (HDTV) signals.
  • HDTV high definition television
  • an antenna assembly generally includes one or more tapered loop antenna elements.
  • FIGS. 1 through 4 illustrate an exemplary antenna assembly 100 embodying one or more aspects of the present disclosure.
  • the antenna assembly 100 generally includes a tapered loop antenna element 104 (also shown in FIGS. 5 through 10 ), a reflector element 108, a balun 112, and a housing 116 with removable end pieces or portions 120.
  • the antenna assembly 100 may be used for receiving digital television signals (of which high definition television (HDTV) signals are a subset) and communicating the received signals to an external device, such as a television.
  • a coaxial cable 124 ( FIGS. 2 and 11 ) is used for transmitting signals received by the antenna assembly 100 to the television ( FIG. 11 ).
  • the antenna assembly 100 may also be positioned on other generally horizontal surfaces, such as a tabletop, coffee tabletop, desktop, shelf, etc.). Alternative embodiments may include an antenna assembly positioned elsewhere and/or supported using other means.
  • the antenna assembly 100 may include a 75-ohm RG6 coaxial cable 124 fitted with an F-Type connector (although other suitable communication links may also be employed). Alternative embodiments may include other coaxial cables or other suitable communication links.
  • the tapered loop antenna element 104 has a generally annular shape cooperatively defined by an outer periphery or perimeter portion 140 and an inner periphery or perimeter portion 144.
  • the outer periphery or perimeter portion 140 is generally circular.
  • the inner periphery or perimeter portion 144 is also generally circular, such that the tapered loop antenna element 104 has a generally circular opening 148.
  • the tapered loop antenna element has an outer diameter of about two hundred twenty millimeters and an inner diameter of about eighty millimeters.
  • Some embodiments include the inner diameter being offset from the outer diameter such that the center of the circle defined generally by the inner perimeter portion 144 (the inner diameter's midpoint) is about twenty millimeters below the center of the circle defined generally by the outer perimeter portion 140 (the outer diameter's midpoint).
  • the inner diameter may be offset from the outer diameter such that the inner diameter's midpoint is about twenty millimeters below the outer diameter's midpoint. The offsetting of the diameters thus provides a taper to the tapered loop antenna element 104 such that it has at least one portion (a top portion 126 shown in FIGS.
  • the tapered loop antenna element 104 includes first and second halves or curved portions 150, 152 that are generally symmetric such that the first half or curved portion 150 is a mirror-image of the second half or curved portion 152.
  • Each curved portion 150, 152 extends generally between a corresponding end portion 128 and then tapers or gradually increases in width until the middle or top portion 126 of the tapered loop antenna element 104.
  • the tapered loop antenna element 104 may be positioned with the housing 116 in an orientation such that the wider portion 126 of the tapered loop antenna element 104 is at the top and the narrower end portions 128 are at the bottom.
  • the tapered loop antenna element 104 includes spaced-apart end portions 128.
  • the end portions 128 of the tapered loop antenna element 104 are spaced apart a distance of about 2.5 millimeters.
  • Alternative embodiments may include an antenna element with end portions spaced apart greater than or less than 2.5 millimeters.
  • some embodiments include an antenna element with end portions spaced apart a distance of between about 2 millimeters to about 5 millimeters.
  • the spaced-apart end portions may define an open slot therebetween that is operable to provide a gap feed for use with a balanced transmission line.
  • the end portions 128 include fastener holes 132 in a pattern corresponding to fastener holes 136 of the PCB balun 112. Accordingly, mechanical fasteners (e.g., screws, etc.) may be inserted through the fastener holes 132, 136 after they are aligned, for attaching the PCB balun 112 to the tapered loop antenna element 104.
  • mechanical fasteners e.g., screws, etc.
  • Alternative embodiments may have differently configured fastener holes (e.g., more or less, different shapes, different sizes, different locations, etc.).
  • Still other embodiments may include other attachment methods (e.g., soldering, etc.).
  • the illustrated tapered loop antenna element 104 is substantially planar with a generally constant or uniform thickness.
  • the tapered loop antenna element 104 has a thickness of about 3 millimeters.
  • Other embodiments may include a thicker or thinner antenna element.
  • some embodiments may include an antenna element with a thickness of about 35 micrometers (e.g., 1 oz. copper, etc.), where the antenna element is mounted, supported, or installed on a printed circuit board.
  • Further embodiments may include a free-standing, self-supporting antenna element made from aluminum, anodized aluminum, copper, etc. having a thickness between about .5 millimeters to about 5 millimeters, etc.
  • the antenna element comprises a relatively thin aluminum foil that is encased in a supporting plastic enclosure, which has been used to reduce material costs associated with the aluminum.
  • Alternative embodiments may include an antenna element that is configured differently than the tapered loop antenna element 104 shown in the figures.
  • other embodiments may include a non-tapered loop antenna element having a centered (not offset) opening.
  • Additional embodiments may include a loop antenna element that defines a full generally circular loop or hoop without spaced-apart free end portions 128.
  • Further embodiments may include an antenna element having an outer periphery/perimeter portion, inner periphery/perimeter portion, and/or opening sized or shaped differently, such as with a non-circular shape (e.g., ovular, triangular, rectangular, etc.).
  • the antenna element 104 (or any portion thereof) may also be provided in various configurations (e.g., shapes, sizes, etc.) depending at least in part on the intended end-use and signals to be received by the antenna assembly.
  • the tapered loop antenna element 104 may be formed from a metallic electrical conductor, such as aluminum (e.g., anodized aluminum, etc.), copper, stainless steel or other alloys, etc.
  • the tapered loop antenna element 104 may be stamped from sheet metal, or created by selective etching of a copper layer on a printed circuit board substrate.
  • FIGS. 1 , 3 , and 4 illustrate the exemplary reflector 108 that may be used with the antenna assembly 100.
  • the reflector 108 includes a generally flat or planar surface 160.
  • the reflector 108 also includes baffle, lip, or sidewall portions 164 extending outwardly relative to the surface 160.
  • the reflector 108 may be generally operable for reflecting electromagnetic waves generally towards the tapered loop antenna element 104.
  • the inventors hereof note the following.
  • the size of the reflector and the spacing to the antenna element strongly impact performance. Placing the antenna element too close to the reflector provides an antenna with good gain, but narrows impedance bandwidth and poor VSWR (voltage standing wave ratio). Despite the reduced size, such designs are not suitable for the intended broadband application. If the antenna element is placed too far away from the reflector, the gain is reduced due to improper phasing.
  • antenna element size and proportions, reflector size, baffle size, and spacing between antenna element and reflector are properly chosen, there is an optimum configuration that takes advantage of the near zone coupling with the electrically small reflector element to produce enhanced impedance bandwidth, while mitigating the effects of phase cancellation.
  • the net result is an exemplary balance between impedance bandwidth, directivity or gain, radiation efficiency, and physical size.
  • the reflector 108 is generally square with four perimeter sidewall portions 164.
  • Alternative embodiments may include a reflector with a different configuration (e.g., differently shaped, sized, less sidewall portions, etc.).
  • the sidewalls may even be reversed so as to point opposite the antenna element. The contribution of the sidewalls is to slightly increase the effective electrical size of the reflector and improve impedance bandwidth.
  • the reflector 108 of one exemplary embodiment has a generally square surface 160 with a length and width of about 228 millimeters.
  • the reflector 108 may also have perimeter sidewall portions 164 each with a height of about 25.4 millimeters relative to the surface 160.
  • the dimensions provided in this paragraph are mere examples provided for purposes of illustration only, as any of the disclosed antenna components herein may be configured with different dimensions depending, for example, on the particular application and/or signals to be received or transmitted by the antenna assembly.
  • another embodiment may include a reflector 108 having a baffle, lip, or perimeter sidewall portions 164 having a height of about ten millimeters.
  • Another embodiment may have the reflector 108 having a baffle, lip in the opposite direction to the antenna element. In such embodiment, it is possible to also add a top to the open box, which may serve as a shielding enclosure for a receiver board or other electronics.
  • cutouts, openings, or notches 168 may be provided in the reflector's perimeter sidewall portions 164 to facilitate mounting of the reflector 108 within the housing 116 and/or attachment of the housing end pieces 120.
  • the reflector 108 may be slidably positioned within the housing 116 ( FIG. 1 ).
  • the fastener holes 172 of the housing end pieces 120 may be aligned with the reflector's openings 168, such that fasteners may be inserted through the aligned openings 168, 172.
  • Alternative embodiments may have reflectors without such openings, cutouts, or notches.
  • FIG. 1 , 3 , and 4 illustrate an exemplary balun 112 that may be used with the antenna assembly 100 for converting a balanced line into an unbalanced line.
  • the antenna assembly 100 includes a printed circuit board having the balun 112.
  • the PCB having the balun 112 may be coupled to the tapered loop antenna element 104 via fasteners and fastener holes 132 and 136 ( FIG. 3 ).
  • Alternative embodiments may include different means for connecting the balun 112 to the tapered loop antenna elements and/or different types of transformers besides the printed circuit board balun 112.
  • the housing 116 includes end pieces 120 and a middle portion 180.
  • the end pieces 120 are removably attached to middle portion 180 by way of mechanical fasteners, fastener holes 172, 174, and threaded sockets 176.
  • Alternative embodiments may include a housing with an integrally-formed, fixed end piece.
  • Other embodiments may include a housing with one or more removable end pieces that are snap-fit, friction fit, or interference fit with the housing middle portion without requiring mechanical fasteners.
  • the housing 116 is generally U-shaped with two spaced-apart upstanding portions or members 184 connected by a generally horizontal member or portion 186.
  • the members 184, 186 cooperatively define a generally U-shaped profile for the housing 116 in this embodiment.
  • the tapered loop antenna element 104 may be positioned in a different upstanding member 184 than the upstanding member 184 in which the reflector 108 is positioned.
  • the housing 116 is configured (e.g., shaped, sized, etc.) such that the tapered loop antenna element 104 is spaced apart from the reflector 108 by about 114.4 millimeters when the tapered loop antenna element 104 and reflector 108 are positioned into the respective different sides of the housing 116.
  • the housing 116 may be configured such that the housing's side portions 184 are generally square with a length and a width of about 25.4 centimeters. Accordingly, the antenna assembly 100 may thus be provided with a relatively small overall footprint.
  • the housing 116 may be formed from various materials. In some embodiments, the housing 116 is formed from plastic. In those embodiments in which the antenna assembly is intended for use as an outdoor antenna, the housing may be formed from a weather resistant material (e.g., waterproof and/or ultra-violet resistant material, etc.). In addition, the housing 116 (or bottom portion thereof) may also be formed from a material so as to provide the bottom surface of the housing 116 with a relatively high coefficient of friction. This, in turn, would help the antenna assembly 100 resist sliding relative to the surface (e.g., top surface of television as shown in FIG. 11 , etc.) supporting the assembly 100.
  • a weather resistant material e.g., waterproof and/or ultra-violet resistant material, etc.
  • the housing 116 (or bottom portion thereof) may also be formed from a material so as to provide the bottom surface of the housing 116 with a relatively high coefficient of friction. This, in turn, would help the antenna assembly 100 resist sliding relative to the surface (e.g., top surface of
  • the antenna assembly may also include a digital tuner/converter (ATSC receiver) built into or within the housing.
  • the digital tuner/converter may be operable for converting digital signals received by the antenna assembly to analog signals.
  • a reflector with a reversed baffle and cover may serve as a shielded enclosure for the ATSC receiver. The shielded box reduces the effects of radiated or received interference upon the tuner circuitry. Placing the tuner in this enclosure conserves space and eliminates (or reduces) the potential for coupling between the antenna element and the tuner, which may otherwise negatively impact antenna impedance bandwidth and directivity.
  • the antenna assembly 100 is tuned (and optimized in some embodiments) to receive signals having a frequency associated with high definition television (HDTV) within a frequency range of about 470 megahertz and about 690 megahertz.
  • HDTV high definition television
  • narrowly tuning the antenna assembly 100 for receiving these HDTV signals allows the antenna element 104 to be smaller and yet still function adequately.
  • the overall size of the antenna assembly 100 may be reduced so as to provide a reduced footprint for the antenna assembly 100, which may, for example, be advantageous when the antenna assembly 100 is used indoors and placed on top of a television (e.g., FIG. 11 , etc.).
  • Exemplary operational parameters of the antenna assembly 100 will now be provided for purposes of illustration only. These operational parameters may be changed for other embodiments depending, for example, on the particular application and signals to be received by the antenna assembly.
  • the antenna assembly 100 may be configured so as to have operational parameters substantially as shown in FIG. 12 , which illustrates computer-simulated gain/directivity and S11 versus frequency (in megahertz) for an exemplary embodiment of the antenna assembly 100 with seventy-five ohm unbalanced coaxial feed.
  • a 300 ohm balanced twin lead may be used.
  • FIG. 12 generally shows that the antenna assembly 100 has a relatively flat gain curve from about 470 MHz to about 698 MHz. In addition, FIG. 12 also shows that the antenna assembly 100 has a maximum gain of about 8 dBi (decibels referenced to isotropic gain) and an output with an impedance of about 75 Ohms.
  • FIG. 12 also shows that the S11 is below -6 dB across the frequency band from about 470 MHz to about 698 MHz. Values of S11 below this value ensure that the antenna is well matched and operates with high efficiency.
  • an antenna assembly may also be configured with fairly forgiving aiming. In such exemplary embodiments, the antenna assembly would thus not have to be re-aimed or redirected each time the television channel was changed.
  • FIG. 13 illustrates another embodiment of an antenna assembly 200 embodying one or more aspects of the present disclosure.
  • the antenna assembly 200 includes two generally side-by-side tapered loop antenna elements 204A and 204B in a generally figure eight configuration (as shown in FIG. 13 ).
  • the two loops 204A and 204B are arranged one opposite to the other such that a gap is maintained between each pair of opposite spaced apart end portions of each loop 204A, 204B.
  • the gap or open slot may be used to provide a gap feed for use with a balanced transmission line. In operation, this gap feed configuration allows the vertical going electrical current components to effectively cancel each other out such that antenna assembly 200 has relatively pure H polarization at the passband frequencies and exhibits very low levels of cross polarized signals.
  • the antenna assembly 200 also includes a reflector 208 and a printed circuit board balun 212.
  • the antenna assembly 200 may be provided with a housing similar to or different than housing 116.
  • the antenna assembly 200 may be operable and configured similar to the antenna assembly 100 in at least some embodiments thereof.
  • FIG. 20 is an exemplary line graph showing computer-simulated directivity and S11 versus frequency (in megahertz) for the antenna assembly 200 according to an exemplary embodiment.
  • FIGS. 14 through 19 and 26 through 42 show additional exemplary embodiments of antenna assemblies embodying one or more aspects of the present disclosure.
  • FIGS. 14 and 15 show an antenna assembly 300 having a tapered loop antenna element 304 and a support 388.
  • the antenna assembly 300 is supported on a horizontal surface 390, such as the top surface of a desk, table top, television, etc.
  • the antenna assembly 300 may also include a printed circuit board balun 312.
  • an antenna assembly may include a tapered loop antenna element (e.g., 304, 404, 504, etc.) with openings (e.g., holes, indents, recesses, voids, dimples, etc.) along the antenna element's middle portion and/or first and second curved portions, where the openings may be used, for example, to help align and/or retain the antenna element to a support.
  • a relatively thin metal antenna element with such openings may be supported by a plastic support structure that has protuberances, nubs, or protrusions that align with and are frictionally received within the openings of the antenna element, whereby the frictional engagement or snap fit helps retain the antenna element to the plastic support structure.
  • FIG. 16 shows an antenna assembly 400 having a tapered loop antenna element 404 and an indoor wall mount/support 488.
  • the antenna assembly is mounted to a vertical surface 490, such a wall, etc.
  • the antenna assembly 400 may also include a printed circuit board balun. The balun, however, is not illustrated in FIG. 10 because it is obscured by the support 488.
  • FIGS. 26 through 42 illustrate another exemplary antenna assembly 800 having a tapered lop antenna element 804 and a rotatably convertible support, mount, or stand 888.
  • the tapered loop antenna 804 may be covered by or disposed within a cover material (e.g., plastic, other dielectric material, etc.), which may be the same material from which the support 888 is made.
  • the rotatably convertible support 888 allows the antenna assembly 800 to be supported on a horizontal surface from a vertical surface depending on whether the support 888 is in a first or second configuration.
  • FIG. 26 illustrates the support or stand 888 in a first configuration in which the support 888 allows the antenna assembly 800 to be supported on a horizontal surface after being placed upon that horizontal surface.
  • the horizontal surface upon which the antenna assembly 800 may be placed may comprise virtually any horizontal surface, such as the top of a desk, table top, television, etc.
  • the antenna assembly 800 may be fixedly attached or fastened to the horizontal surface by using mechanical fasteners (e.g., wood screws, etc.) inserted through fastener holes 899 ( FIG. 36 ) on the bottom of the support 888. But the antenna assembly 800 may be attached to a horizontal surface using other methods, such as double-side adhesive tape, etc. Or, the antenna assembly 800 need not be attached to the horizontal surface at all.
  • FIG. 27 illustrates the support 888 in a second configuration that allows the antenna assembly 800 to be mounted to a vertical surface, such as wall, etc.
  • the antenna assembly 800 may be suspended from a nail or screw on a wall by way of the opening 898 ( FIG. 40 ) on the bottom of the support 888.
  • the rotatably convertible support 888 includes a threaded stem portion 889 and a threaded opening 894.
  • the threaded stem portion 889 extends upwardly from the base of the support 888, and the threaded opening 894 is defined by the upper portion of the support 888. In other embodiments, this may be reversed such that the base includes threaded opening, and the threaded stem portion extends downwardly from the upper portion of the mount.
  • the support 888 also includes stops for retaining the rotatably convertible support 888 in the first or second configuration.
  • the support 888 include a first stop 890 (e.g., projection, nub, protrusion, protuberance, etc.) configured to be engagingly received within an opening 891, for retaining the support 888 in the first configuration.
  • FIGS. 30 , 31 , and 34 illustrate the engagement of the first stop 890 within the opening 891, which inhibits relative rotation of the upper and lower portions of the support 888 thus helping retain support 888 in the first configuration for supporting the antenna assembly 800 on a horizontal surface.
  • the first stop 890 is provided on the upper portion of the support 888 and the opening 891 is on the lower portion or base of the support 888. In other embodiments, this may be reversed such that the base includes the first stop and the opening is on the upper portion of the support.
  • the support 888 also include a second stop 893 ( FIG. 29 ) (e.g., projection, nub, protrusion, protuberance, etc.) configured to be engagingly received within an opening 892 ( FIG. 28 ), for retaining the support 888 in the second configuration.
  • the engagement of the second stop 893 within the opening 892 inhibits relative rotation of the upper and lower portions of the support 888 thus helping retain support 888 in the second configuration for supporting the antenna assembly 800 from a vertical surface.
  • the second stop 893 is provided on the upper portion of the support 888 and the opening 892 is on the lower portion or base of the support 888. In other embodiments, this may be reversed such that the base includes the second stop and the opening is on the upper portion of the support.
  • the stops may also help provide a tactile and/or audible indication to the user to stop rotating the upper or lower portion of the support 888 relative to the other portion. For example, as a user is reconfiguring or converting the support 888 from the first or second configuration to the other configuration, the user may feel and/or hear an audible click as the corresponding first or second stop 890, 893 is engaged into the corresponding opening 891, 892.
  • the antenna assembly 800 includes a connector 897 for connecting a coaxial cable to the antenna assembly 800.
  • Alternative embodiments may include different types of connectors.
  • the antenna assemblies 300 do not include any reflector.
  • the antenna assemblies 300, 400, 800 are configured to provide good VSWR (voltage standing wave ratio) without a reflector.
  • the antenna assemblies 300, 400, 800 may include a reflector, such as reflector identical or similar to a reflector disclosed herein (e.g., 108 ( FIG. 1 ), 208 ( FIG. 13 ), 508 ( FIG. 17 ), 608 ( FIG. 19 ), 708 ( FIG. 21 ), 908 ( FIG. 43 ), 1008 ( FIG. 48 ) or other suitably configured reflector.
  • the antenna assemblies 300, 400, 800 may be operable and configured similar to the antenna assemblies 100 and 200 in at least some embodiments thereof.
  • the illustrated circular shapes of the supports 388, 488, 888 are only exemplary embodiments.
  • the support 388, 488, 888 may have many shapes (e.g. square, hexagonal, etc.). Removing a reflector may result in an antenna with less gain but wider bi-directional pattern, which may be advantageous for some situations where the signal strength level is high and from various directions.
  • FIGS. 17 through 19 show an antenna assembly 500 having a tapered loop antenna element 504, a printed circuit board balun 512, and a support 588, where the antenna assembly 500 is mounted outdoors to a vertical mast or pole 592.
  • FIG. 19 shows an antenna assembly 600 having two tapered loop antenna elements 604A and 604B and a support 688, where the antenna assembly 600 is mounted outdoors to a vertical mast or pole 692.
  • the supports 588 and/or 688 may be nonconvertible or rotatably convertible in a manner substantially similar to the support 888.
  • the antenna assemblies 500 and 600 include reflectors 508 and 608. Unlike the generally solid planar surface of reflectors 108 and 208, the reflectors 508 and 608 have a grill or mesh surface 560 and 660.
  • the reflector 508 also includes two perimeter flanges 564.
  • the reflector 608 includes two perimeter flanges 664.
  • a mesh reflector is generally preferred for outdoor applications to reduce wind loading. With outdoor uses, size is generally less important such that the mesh reflector may be made somewhat larger than the equivalent indoor models to compensate for the inefficiency of the mesh. The increased size of the mesh reflector also removes or reduces the need for a baffle, which is generally more important on indoor models that tend to be at about the limit of the size versus performance curves.
  • any of the various embodiments disclosed herein may include one or more components (e.g., balun, reflector, etc.) similar to components of antenna assembly 100.
  • any of the various disclosed herein may be operable and configured similar to the antenna assembly 100 in at least some embodiments thereof.
  • an antenna element for signals in the very high frequency (VHF) range may be less circular in shape but still based on an underlying electrical geometry of antenna elements disclosed herein.
  • a VHF antenna element for example, may be configured to provide electrical paths of more than one length along an inner and outer periphery of the antenna element. The proper combination of such an element with an electrically small reflector may thus result in superior balance of directivity, efficiency, bandwidth, and physical size as what may be achieved in other example antenna assemblies disclosed herein.
  • FIGS. 21 through 24 illustrate an exemplary embodiment of an antenna assembly 700, which may be used for reception of VHF signals (e.g., signals within a frequency bandwidth of 170 Megahertz to 216 Megahertz, etc.).
  • the antenna assembly 700 includes an antenna element 704 and a reflector 708.
  • the antenna element 704 has an outer periphery or perimeter portion 740 and an inner periphery or perimeter portion 744.
  • the outer periphery or perimeter portion 740 is generally rectangular.
  • the inner periphery or perimeter portion 744 is also generally rectangular.
  • the antenna element 704 also includes a tuning bar 793 disposed or extending generally between the two side members 794 of the antenna element 704.
  • the tuning bar 793 is generally parallel with the top member 795 and bottom members 796 of the antenna element 704.
  • the tuning bar 793 extends across the antenna element 704, such that the antenna element 704 includes a lower generally rectangular opening 748 and an upper generally rectangular opening 749.
  • the antenna element 704 further includes spaced-apart end portions 728.
  • the antenna element 704 includes first and second electrical paths of different lengths, where the shorter electrical path includes the tuning bar 793 and the longer electrical path does not.
  • the longer electrical path is defined by an outer loop of the antenna element 704, which includes the antenna element's spaced-apart end portions 728, bottom members 796, side members 794, and top member 795.
  • the shorter electrical path is defined by an inner loop of the antenna element 704, which includes the antenna element's spaced-apart end portions 728, bottom members 796, portions of the side members 794 (the portions between the tuning bar 793 and bottom members 796), and the tuning bar 793.
  • the electrical paths defined by the inner and outer loops of the antenna element 704 allow for efficient operation within the VHF bandwidth range of about 170 Megahertz to about 216 Megahertz in some embodiments. With the greater efficiency, the size of the antenna assembly may thus be reduced (e.g., 75% size reduction, etc.) and still provide satisfactory operating characteristics.
  • the tuning bar 793 may be configured (e.g., sized, shaped, located, etc.) so as to provide impedance matching for the antenna element 704. In some example embodiments, the tuning bar 793 may provide the antenna element 704 with a more closely matched impedance to a 300 ohm transformer.
  • the end portions 728 of the antenna element 704 are spaced apart a distance of about 2.5 millimeters.
  • the antenna element 704 may be configured to have a width (from left to right in FIG. 22 ) of about 600 millimeters, a height (from top to bottom in FIG. 22 ) of about 400 millimeters, and have the tuning bar 793 spaced above the bottom members 796 by a distance of about 278 millimeters.
  • a wide range of materials may be used for the antenna element 704.
  • the antenna element 704 is made from aluminum hollow tubing with a 3 ⁇ 4 inch by 3 ⁇ 4 inch square cross section.
  • the various portions (728, 793, 794, 795, 796) of the antenna element 704 are all formed from the same aluminum tubing, although this is not required for all embodiments.
  • Alternative embodiments may include an antenna element configured differently, such as from different materials (e.g., other materials besides aluminum, antenna elements with portions formed from different materials, etc.), non-rectangular shapes and/or different dimensions (e.g., end portions spaced apart greater than or less than 2.5 millimeters, etc.).
  • some embodiments include an antenna element with end portions spaced apart a distance of between about 2 millimeters to about 5 millimeters. The spaced-apart end portions may define an open slot therebetween that is operable to provide a gap feed for use with a balanced transmission line.
  • the reflector 708 includes a grill or mesh surface 760.
  • the reflector 708 also includes two perimeter flanges 764.
  • the perimeter flanges 764 may extend outwardly from the mesh surface 760.
  • members 797 may be disposed behind the mesh surface 760, to provide reinforcement to the mesh surface 760 and/or a means for supporting or coupling the mesh surface 760 to a supporting structure.
  • the reflector 708 may be configured to have a width (from left to right in FIG. 22 ) of about 642 millimeters, a height (from top to bottom in FIG.
  • the reflector 708 includes vinyl coated steel.
  • Alternative embodiments may include a differently configured reflector (e.g., different material, shape, size, location, etc.), no reflector, or a reflector positioned closer or farther away from the antenna element.
  • FIG. 25 is an exemplary line graph showing computer-simulated directivity and VSWR (voltage standing wave ratio) versus frequency (in megahertz) for the antenna assembly 700 according to an exemplary embodiment.
  • FIGS. 43 and 44 illustrate an exemplary embodiment of an antenna assembly 900 embodying one or more aspects of the present disclosure.
  • the antenna assembly 900 includes a tapered loop antenna element 904 and a rotatably convertible support, mount, or stand 988.
  • the support 988 is rotatably convertible between a first configuration (shown in FIGS. 43 and 44 ) for supporting the antenna assembly 900 on a horizontal surface and a second configuration for supporting the antenna assembly 900 from a vertical surface.
  • the antenna assembly 900 may be attached, fastened, or coupled to a surface by using mechanical fasteners (e.g., screws, etc.) inserted within fastener holes 998 and 999 on the bottom ( FIG. 47 ) of the support 988.
  • the antenna assembly 900 may be attached to a surface using other methods, such as double-sided adhesive tape, etc. Or, the antenna assembly 900 need not be attached to the horizontal surface at all.
  • the support 988 may be similar in structure and operation as the support 888 of antenna assembly 800 described above.
  • the support 988 includes a threaded stem portion 989 ( FIG. 45 ) extending upwardly from the base of the support 988.
  • the support 988 also includes a threaded opening defined by the upper portion of the support 988. In other embodiments, this may be reversed such that the base includes threaded opening, and the threaded stem portion extends downwardly from the upper portion of the mount.
  • the support 988 includes stops for retaining the rotatably convertible support 988 in the first or second configuration as described above for support 888.
  • the support 988 include a first stop (e.g., projection, nub, protrusion, protuberance, etc.) configured to be engagingly received within an opening 991 ( FIG. 45 ) for retaining the support 988 in the first configuration ( FIG. 44 ).
  • the support 988 includes a second stop 993 ( FIG. 44 ) (e.g., projection, nub, protrusion, protuberance, etc.) configured to be engagingly received within an opening for retaining the support 988 in the second configuration.
  • the stops may also help provide a tactile and/or audible indication to the user to stop rotating the upper or lower portion of the support 988 relative to the other portion.
  • the support 988 further includes a connector 997 for connecting a coaxial cable (e.g., a 75-ohm RG6 coaxial cable fitted with an F-Type connector, etc.) to the antenna assembly 900.
  • a coaxial cable e.g., a 75-ohm RG6 coaxial cable fitted with an F-Type connector, etc.
  • Alternative embodiments may include different types of connectors.
  • the rotatably convertible support 988 also includes a slot or groove 909 as shown in FIG. 46 .
  • the slot or groove 909 is configured for receiving a lower portion of a reflector 908 therein for mounting the reflector 908 to the support 988 without requiring any mechanical fastener or other mounting means.
  • a reflector 908 may be mounted in the slot 909 when the support 988 is in the first configuration for supporting the antenna assembly 900 on a horizontal surface. When mounted in the slot 909, the reflector 908 is spaced apart from the tapered loop antenna element 904 as shown in FIG. 44 .
  • the reflector 908 comprises a grill or mesh surface 960 having two perimeter flanges or sidewalls 964 extending outwardly (e.g., at oblique angles, etc.) from the mesh surface 960.
  • the reflector 908 is operable for reflecting electromagnetic waves generally towards the tapered loop antenna element 904 and generally affecting impedance bandwidth and directionality.
  • reflectors having other configurations may be used, such as a reflector with a solid planar surface (e.g., reflector 108, 208, etc.).
  • the antenna assembly 900 may not include any reflector 908.
  • the antenna assembly 900 may include one or more components similar to components described above for antenna assembly 800.
  • the antenna assembly 900 may be operable and configured similar to the antenna assembly 100 in at least some embodiments thereof.
  • the antenna assembly 900 may be configured to have, provide and/or operate with one or more of (but not necessarily any or all of) the following features.
  • the antenna assembly 900 may be configured to operate with a range of 30+ miles with a peak gain (UHF) of 8.25 dBi, and consistent gain throughout the entire UHF DTV channel spectrum.
  • UHF peak gain
  • the antenna assembly 900 may provide great performance regardless of whether it is indoors, outdoors, or in an attic.
  • the antenna assembly 900 may be dimensionally small with a length of 12 inches, width of 12 inches, and depth of 5 inches.
  • the antenna assembly 900 may have an efficient, compact design that offers excellent gain and impedance matching across the entire post 2009 UHF DTV spectrum and with good directivity at all UHF DTV frequencies with a peak gain of 8.25 dBi.
  • FIGS. 48 and 49 illustrate an exemplary embodiment of an antenna assembly 1000 embodying one or more aspects of the present disclosure.
  • the antenna assembly 1000 includes two tapered loop antenna elements 1004 (e.g., in a figure eight configuration, etc.) and a support 1088.
  • the two loops 1004 are arranged one opposite to the other such that a gap is maintained between each pair of opposite spaced apart end portions of each loop 1004.
  • the gap or open slot may be used to provide a gap feed for use with a balanced transmission line. In operation, this gap feed configuration allows the vertical going electrical current components to effectively cancel each other out such that antenna assembly 1000 has relatively pure H polarization at the passband frequencies and exhibits very low levels of cross polarized signals.
  • the antenna assembly 1000 also includes a reflector 1008 having a grill or mesh surface 1060. Two perimeter flanges or sidewalls 1064 extend outwardly (e.g., at an oblique angle, etc.) from the mesh surface 1060.
  • the reflector 1008 is operable for reflecting electromagnetic waves generally towards the tapered loop antenna element 1004 and generally affecting impedance bandwidth and directionality.
  • reflectors having other configurations may be used, such as a reflector with a solid planar surface (e.g., reflector 108, 208, etc.).
  • the antenna assembly 1000 may not include any reflector 1008.
  • the antenna assembly 1000 also includes a dipole 1006.
  • the dipole 1006 may be fed from the center and include two conductors or dipole antenna elements 1007 (e.g., rods, etc.).
  • the dipole antenna elements 1007 extend outwardly relative to the tapered loop antenna elements 1004.
  • the dipole antenna elements 1007 extend laterally outward from respective left and right sides of the antenna assembly 1000.
  • the dipole 1006 is configured so as to allow the antenna assembly 1000 to operate across a VHF frequency range from about 174 megahertz to about 216 megahertz.
  • the double tapered loop antenna elements 1004 allows the antenna assembly 1000 to also operate across a UHF frequency range from about 470 megahertz to about 806.
  • the antenna assembly 1000 is specifically configured for reception (e.g., tuned and/or targeted, etc.) across the UHF/VHF DTV channel spectrum of frequencies.
  • the antenna assembly 1000 may include one or more components similar to components described above for double tapered loop antenna assembly 600.
  • the antenna assembly 1000 may include an impedance 75 Ohm output F connection.
  • the antenna assembly 1000 may be configured to have, provide and/or operate with one or more of (but not necessarily any or all of) the following features.
  • the antenna assembly 1000 may be configured to operate within both a VHF frequency range from 174 MHz to 216 MHz (Channels 7-13) and a UHF 470 MHz to 806 MHz (Channels 14-69).
  • the antenna assembly 1000 may have a range of 50+ miles with a generous beam width of 70 degrees, a peak gain (UHF) of 10.4 dBi at 670 MHz, a peak gain (VHF) of 3.1 dBi at 216 MHz, VSWR 3.0 max for UHF and VHF, and consistent gain throughout the entire UHF/VHF DTV channel spectrum.
  • the antenna assembly 1000 may provide great performance regardless of whether it is indoors, outdoors, or in an attic.
  • the antenna assembly 1000 may be dimensionally small with a length of 20 inches, width of 35.5 inches, and depth of 6.5 inches.
  • the antenna assembly 1000 may be configured to have improved performance for weak VHF stations and be operable as a broadband antenna without performance compromises.
  • the antenna assembly 1000 includes an integrated diplexer that allows the specially tuned HDTV elements to be combined without performance degradation.
  • the diplex in this example comprises an integrated UHF balun diplexer internal to the UHF antenna, e.g., within the support 1088.
  • Traditional multiband antennas are inherently compromised in that up to 90% of the television signal can be lost through impedance mismatches and phase cancellation when signals from their disparate elements are combined.
  • the inventors hereof developed and included a unique network feed in their antenna assembly 1000, which network feed is able to combine the UHF and VHF signals without the losses mentioned above.
  • the antenna assembly 1000 may deliver 98% of signal reception to a digital tuner rather than being lost through impedance mismatches and phase cancellation.
  • the antenna assembly 1000 is shown mounted to a mast or mounting pole 1092 for free-standing indoor use according to an exemplary embodiment.
  • the mounting pole 1092 may be generally J-shaped and have a length of about 20 inches.
  • the mounting pole 1092 is shown secured to a mounting bracket via bolts.
  • the antenna assembly 1000 may be mounted differently indoors, outdoors, in an attic, etc.
  • FIGS. 51 through 57 illustrate performance technical data for the antenna assembly 1000 shown in FIG. 48 .
  • the computer-simulated performance data was obtained using a state-of-the-art simulator with the following assumptions of a perfect electrical conductor (PEC), free space, no balun included, and 300 ohm line transmission line reference.
  • PEC perfect electrical conductor
  • the data and results shown in FIGS. 51 through 57 are provided only for purposes of illustration and not for purposes of limitation. Accordingly, an antenna assembly may be configured to have operational parameters substantially as shown in any one or more of FIGS. 51 through 57 , or it may be configured to have different operational parameters depending, for example, on the particular application and signals to be received by the antenna assembly.
  • the antenna assembly 1000 had a peak gain (UHF) of 10.4 dBi at 670 MHz, a peak gain (VHF) of 3.1 dBi at 216 MHz, and a maximum VSWR of 3.0 for both UHF and VHF. Notably, the antenna assembly had consistent gain throughout the entire UHF/VHF DTV channel spectrum.
  • embodiments of the present disclosure include antenna assemblies that may be scalable to any number of (one or more) antenna elements depending, for example, on the particular end-use, signals to be received or transmitted by the antenna assembly, and/or desired operating range for the antenna assembly.
  • another exemplary embodiment of an antenna assembly includes four tapered loop antenna elements, which are collectively operable for improving the overall range of the antenna assembly.
  • a method generally includes connecting at least one communication link from an antenna assembly to a television for communicating signals to the television that are received by the antenna assembly.
  • the antenna assembly e.g., 100, 200, 300, 400, 500, 600, 700, 800, 900, 1000, etc.
  • the antenna assembly may include at least one antenna element (e.g., 104, 204, 304, 504, 604, 704, 804, 904, etc.).
  • the antenna assembly may include at least one reflector element (e.g., 108, 208, 508, 608, 708, 908, 1008, etc. ) .
  • there may be a free-standing antenna element without any reflector element, where the free-standing antenna element may provide good impedance bandwidth, but low directivity for very compact solutions that work in high signal areas.
  • a method may include rotating a portion of a support (e.g., support 888, 988, etc.) to a first or a second configuration, where the support in the first configuration allows an antenna assembly to be supported on a horizontal surface and the support in the second configuration allows the antenna assembly to be supported on a vertical surface.
  • the antenna assembly may be operable for receiving high definition television signals having a frequency range of about 470 megahertz and about 690 megahertz.
  • the antenna element may have a generally annular shape with an opening (e.g., 148, etc.).
  • the antenna element (along with reflector size, baffle, and spacing) may be tuned to at least one electrical resonant frequency for operating within a bandwidth ranging from about 470 megahertz to about 690 megahertz.
  • the reflector element may be spaced-apart from the antenna element for reflecting electromagnetic waves generally towards the antenna element and generally affecting impedance bandwidth and directionality.
  • the antenna element may include spaced-apart first and second end portions (e.g., 128, etc.), a middle portion (e.g., 126, etc.), first and second curved portions (e.g., 150, 152, etc.) extending from the respective first and second end portions to the middle portion such that the antenna element's annular shape and opening are generally circular.
  • the first and second curved portions may gradually increase in width from the respective first and second end portions to the middle portion such that the middle portion is wider than the first and second end portions and such that an outer diameter of the antenna element is offset from a diameter of the generally circular opening.
  • the first curved portion may be a mirror image of the second curved portion.
  • a center of the generally circular opening may be offset from a center of the generally circular annular shape of the antenna element.
  • the reflector element may include a baffle (e.g., 164, etc.) for deflecting electromagnetic waves.
  • the baffle may be located at least partially along at least one perimeter edge portion of the reflector element.
  • the reflector element may include a substantially planar surface (e.g., 160, etc.) that is substantially parallel with the antenna element, and at least one sidewall portion (e.g., 164, etc.) extending outwardly relative to the substantially planar surface generally towards the tapered loop antenna element.
  • the reflector element includes sidewall portions along perimeter edge portions of the reflector element, which are substantially perpendicular to the substantially planar surface of the reflector element, whereby the sidewall portions are operable as a baffle for deflecting electromagnetic wave energy.
  • Embodiments of an antenna assembly disclosed herein may be configured to provide one or more of the following advantages.
  • embodiments disclosed herein may provide antenna assemblies that are physically and electrically small but still capable of operating and behaving similar to physically larger and electrically larger antenna assemblies.
  • Exemplary embodiments disclosed may provide antenna assemblies that are relatively small and unobtrusive, which may be used indoors for receiving signals (e.g., signals associated with digital television (of which high definition television signals are a subset), etc.).
  • exemplary embodiments disclosed herein may be specifically configured for reception (e.g., tuned and/or targeted, etc.) for use with the year 2009 digital television (DTV) spectrum of frequencies (e.g., HDTV signals within a first frequency range of about 174 megahertz and about 216 megahertz and signals within a second frequency range of about 470 megahertz and about 690 megahertz, etc.).
  • DTV digital television
  • Exemplary embodiments disclosed herein may thus be relatively highly efficient (e.g., about 90 percent, about 98 percent at 545 MHz, etc.) and have relatively good gain (e.g., about eight dBi maximum gain, excellent impedance curves, flat gain curves, relatively even gain across the 2009 DTV spectrum, relatively high gain with only about 25.4 centimeter by about 25.4 centimeter footprint, etc.). With such relatively good efficiency and gain, high quality television reception may be achieved without requiring or needing amplification of the signals received by some exemplary antenna embodiments. Additionally, or alternatively, exemplary embodiments may also be configured for receiving VHF and/or UHF signals.
  • Exemplary embodiments of antenna assemblies have been disclosed herein as being used for reception of digital television signals, such as HDTV signals.
  • Alternative embodiments may include antenna elements tuned for receiving non-television signals and/or signals having frequencies not associated with HDTV.
  • Other embodiments may be used for receiving AM/FM radio signals, UHF signals, VHF signals, etc.
  • embodiments of the present disclosure should not be limited to receiving only television signals having a frequency or within a frequency range associated with digital television or HDTV.
  • Antenna assemblies disclosed herein may alternatively be used in conjunction with any of a wide range of electronic devices, such as radios, computers, etc. Therefore, the scope of the present disclosure should not be limited to use with only televisions and signals associated with television.
  • Numerical dimensions and specific materials disclosed herein are provided for illustrative purposes only. The particular dimensions and specific materials disclosed herein are not intended to limit the scope of the present disclosure, as other embodiments may be sized differently, shaped differently, and/or be formed from different materials and/or processes depending, for example, on the particular application and intended end use.
  • Disclosure of values and ranges of values for specific parameters are not exclusive of other values and ranges of values useful herein. It is envisioned that two or more specific exemplified values for a given parameter may define endpoints for a range of values that may be claimed for the parameter. For example, if Parameter X is exemplified herein to have value A and also exemplified to have value Z, it is envisioned that parameter X may have a range of values from about A to about Z. Similarly, it is envisioned that disclosure of two or more ranges of values for a parameter (whether such ranges are nested, overlapping or distinct) subsume all possible combination of ranges for the value that might be claimed using endpoints of the disclosed ranges.
  • parameter X is exemplified herein to have values in the range of 1 - 10, or 2 - 9, or 3 - 8, it is also envisioned that Parameter X may have other ranges of values including 1 - 9, 1 - 8, 1 - 3, 1 - 2, 2 - 10, 2 - 8, 2 - 3, 3 - 10, and 3 - 9.

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TWM488113U (zh) 2014-10-11
TWI573323B (zh) 2017-03-01

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