EP2891211B1 - Bandklemme zur befestigung an einem radom - Google Patents

Bandklemme zur befestigung an einem radom Download PDF

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Publication number
EP2891211B1
EP2891211B1 EP13833558.3A EP13833558A EP2891211B1 EP 2891211 B1 EP2891211 B1 EP 2891211B1 EP 13833558 A EP13833558 A EP 13833558A EP 2891211 B1 EP2891211 B1 EP 2891211B1
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EP
European Patent Office
Prior art keywords
band clamp
reflector
reflector dish
protruding portion
lip
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.)
Active
Application number
EP13833558.3A
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English (en)
French (fr)
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EP2891211A1 (de
EP2891211A4 (de
Inventor
Chris Hills
Alastair Wright
Ian Renilson
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Commscope Technologies LLC
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Commscope Technologies LLC
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Priority claimed from US13/600,544 external-priority patent/US9083083B2/en
Application filed by Commscope Technologies LLC filed Critical Commscope Technologies LLC
Publication of EP2891211A1 publication Critical patent/EP2891211A1/de
Publication of EP2891211A4 publication Critical patent/EP2891211A4/de
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Publication of EP2891211B1 publication Critical patent/EP2891211B1/de
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/42—Housings not intimately mechanically associated with radiating elements, e.g. radome
    • H01Q1/421—Means for correcting aberrations introduced by a radome
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/42—Housings not intimately mechanically associated with radiating elements, e.g. radome
    • 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
    • H01Q19/02—Details
    • H01Q19/021—Means for reducing undesirable effects
    • H01Q19/022—Means for reducing undesirable effects for reducing the edge scattering of reflectors
    • 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
    • H01Q19/12—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 wherein the surfaces are concave

Definitions

  • This invention relates to microwave reflector antennas. More particularly, the invention relates to a reflector antenna with a radome and reflector dish interconnection band clamp which enhances signal pattern and mechanical interconnection characteristics.
  • the open end of a reflector antenna is typically enclosed by a radome coupled to the distal end of the reflector dish.
  • the radome provides environmental protection and improves wind load characteristics of the antenna.
  • Edges and/or channel paths of the reflector dish, radome and/or interconnection hardware may diffract or enable spill-over of signal energy present in these areas, introducing undesirable backlobes into the reflector antenna signal pattern quantified as the front to back ratio (F/B) of the antenna.
  • the F/B is regulated by international standards, and is specified by for example, the FCC in 47 CFR Ch.1 Part 101.115 in the United States, by ETSI in EN302217-4-1 and EN302217-4-12 in Europe, and by ACMA RALI FX 3 Appendix 11 in Australia.
  • Prior antenna signal pattern backlobe suppression techniques include adding a backlobe suppression ring to the radome, for example via metalizing of the radome periphery as disclosed in commonly owned US Utility Patent No. 7,138,958, titled "Reflector Antenna Radome with Backlobe Suppressor Ring and Method of Manufacturing" issued November 21, 2006 to Syed et al.
  • the required metalizing operations may increase manufacturing complexity and/or cost, including elaborate coupling arrangements configured to securely retain the shroud upon the reflector dish without presenting undesired reflection edges, signal leakage paths and/or extending the overall size of the radome.
  • the thin metalized ring layer applied to the periphery of the radome may be fragile, requiring increased care to avoid damage during delivery and/or installation.
  • Reflectors employing castellated edge geometries to generate constructive interference of the edge diffraction components have also been shown to improve the F/B, for example as disclosed in commonly owned Canada Patent No. CA887303 "Backlobe Reduction in Reflector-Type Antennas" by Holtum et al. Such arrangements increase the overall diameter of the antenna, which may complicate radome attachment, packaging and installation.
  • a shroud to a reflector antenna improves the signal pattern generally as a function of the shroud length, but also similarly introduces significant costs as the increasing length of the shroud also increases wind loading of the reflector antenna, requiring a corresponding increase in the antenna and antenna support structure strength. Further, an interconnection between the shroud and a radome may introduce significant F/B degradation.
  • a conventional band clamp 1 applied to retain a radome 3 upon the reflector dish 7 or shroud may introduce diffraction edges and/or signal leakage paths, for example as shown in Figure 1 .
  • Metal taping, RF gaskets or the like may be applied to reduce F/B degradation resulting from band clamp use.
  • these materials and procedures increase manufacturing costs and/or installation complexity and may be of limited longterm reliability.
  • US 2011/140983 A1 discloses a band clamp for coupling a radome to a distal end of a reflector dish for improving the front to back ratio of a reflector antenna, the band clamp provided with an inward projecting proximal lip and an inward projecting distal lip.
  • the distal lip is dimensioned with an inner diameter equal to or less than a reflector aperture of the reflector dish.
  • the proximal lip is provided with a turnback region dimensioned to engage an outer surface of a signal area of the reflector dish in an interference fit.
  • a width of the band clamp may be dimensioned, for example, between 0.8 and 1.5 wavelengths of an operating frequency.
  • a band clamp 1 is generally operative to retain a radome 3 upon the open distal end 5 of a reflector dish 7, creating an environmental seal that protects the reflector dish 7, subreflector 9 and/or feed 11 of a reflector antenna 13 from environmental fouling.
  • the band clamp 1 is provided with inward facing distal and proximal lips 15, 17.
  • a turnback region 19 of the proximal lip 17 is dimensioned to engage the outer surface 21 of the signal area 23 of the reflector dish 7. The turnback region 19 may be applied, for example, as an outward bend prior to the inward end 25 of the proximal lip 17.
  • the diameter of the band clamp 1 is progressively reduced, driving the turnback region 19 against the convex outer surface 21 of the signal area 23 of the reflector dish 7, into a uniform circumferential interference fit.
  • the turnback region 19 slides progressively inward along the outer surface 21 of the signal area 23 of the reflector dish 7 toward the reflector dish proximal end 27.
  • the distal lip 15 of the band clamp 1 also moves towards the reflector dish proximal end 27, securely clamping the radome 3 against the distal end 5 of the reflector dish 7. Because the interference fit between the turnback region 19 and the outer surface 21 of the reflector dish 7 is circumferentially uniform, any RF leakage between these surfaces is reduced.
  • the radome 3 may be provided with a greater diameter than the reflector dish 7, an annular lip 29 of the radome periphery mating with an outer diameter of the distal end 5 of the reflector dish 7, keying the radome 3 coaxial with the reflector dish 7 and providing surface area for spacing the band clamp 1 from the signal area 23 of the reflector dish 7.
  • the flanges may be dimensioned and the band clamp 1 similarly dimensioned such that the distal lip 15 of the band clamp 1 is even with or extends slightly inward of a reflector aperture H, defined as the largest diameter of the reflector dish surface upon which signal energy is distributed by the subreflector 9, to form a band clamp inner diameter D.
  • a reflector aperture H defined as the largest diameter of the reflector dish surface upon which signal energy is distributed by the subreflector 9, to form a band clamp inner diameter D.
  • the band clamp inner diameter D may be dimensioned with respect to reflector aperture H, resulting in significant F/B enhancement as illustrated in Figure 5 .
  • a D/H ratio of 0.97-1.0 may be applied.
  • band clamp 1 width "A" determines the distance between band clamp outer corner(s) 31 acting as diffraction/scatter surfaces.
  • width "A" is between 0.8 and 1.5 wavelengths of the operating frequency, which can be operative to generate mutual interference of surface currents traveling along the band clamp outer periphery and/or scatter interference.
  • Figures 7 and 8 The significant improvement in measured F/B performance in a 0.6 meter reflector antenna configurations for both co-polar and cross-polar responses with a conventional prior art band clamp 1 and the and clamp configuration of figure 4 are illustrated in Figures 7 and 8 .
  • Figures 9 and 10 illustrate measured backlobe levels of co-polar and cross-polar radiation patterns in the 26 GHz band within the regulatory envelopes at greater than 71 dB with the band clamp configuration shown in Figure 4 , in which the width "A" is equal to 1.1 wavelengths.
  • width "A” may be difficult to achieve for some operating frequencies without incorporating further structure in the radome and/or reflector dish periphery.
  • the width "A” may be increased via the application of a fold 33 in the band clamp from the desired extent of the width "A” back toward the reflector dish 7.
  • the pictured embodiment is simplified for demonstration purposes with respect to extending the width "A” but may similarly be applied with a fold 33 and proximal lip 17 that extends further inward and includes a turnback region 19 contacting the outer surface 21 of the signal area 23 of the reflector dish 7.
  • an extension of the width "A" may be cost effectively achieved by attaching a further width ring 35 of metallic and/or metal coated material to the band clamp 1 outer diameter.
  • the width ring 35 may be applied with any desired width, cost effectively securely attached by spot welding or fasteners such as screws, rivets or the like.
  • Figure 13 illustrates 18 GHz band RF modeling software predictions of F/B improvement between a width ring 35 width "A" of 0.5 and 1.2 wavelengths.
  • the width ring 35 may be provided in an angled configuration as demonstrated in Figure 18 .
  • RF modeling software predictions of F/B improvement indicate progressively increasing improvement as the angle applied increases from zero (flat width ring cross section) to sixty degrees of diffraction gradient.
  • the width ring 35 are formed integral with the band clamp cross section as a protruding portion 37 of desired dimension.
  • These complex structures may be cost efficiently formed with high precision via, for example, extrusion, injection molding, progressive punching and/or stretch forming.
  • the protruding portion 37 creates a band clamp 1 with a generally uniform cross section in which the proximal lip 17, distal lip 15 and protruding portion 37 form a unitary contiguous portion.
  • the unitary contiguous portion simplifies manufacture by eliminating additional attachment steps and long term interconnection reliability concerns that may arise when separate elements such as width bands 35 are applied to the band clamp 1.
  • the protruding portion 37 is provided extending from an outer diameter of the band clamp 1 parallel to a longitudinal axis of the reflector dish 7, effectively extending the width "A" of the band clamp 1 without requiring a separate width band 35 as described herein above with respect to Figure 12 .
  • the protruding portion 37 may be dimensioned, for example, such that the resulting band width "A" is a multiple of a quarter wavelength of a desired operating frequency of the reflector dish 7.
  • the protruding portion 37 may be angled as described hereinabove with respect to Figures 18 and 19 . As modeled in Figure 19 , the angle applied to the protruding portion 37 may be, for example, 60 degrees with respect to a longitudinal axis of the reflector dish 7.
  • the distal edge 39 of the protruding portion may be provided with a serration 41 ( Figures 24-27 ) or a castellation 43 ( Figures 28-31 ) to further inhibit backlobe generation at specific operating frequencies.
  • Treatments of the distal edge 39 to form the serration(s) 41 and/or castellation 43 may be applied as an additional fabrication step upon a uniform cross section band with protruding portion 37, for example as shown in Figures 22 and 23 , by stamping, cutting or the like to remove the desired portions of the distal edge 39.
  • the protruding portion 37 may also be dimensioned to extend from the outer diameter of the band clamp 1 to form at least one choke groove 45 open to a distal end 5 of the reflector dish 7, for example as shown in Figures 32-35 .
  • the number of choke grooves 45 may be increased.
  • band clamp 1 may be provided with two concentric choke grooves 45.
  • the interference fit between the band clamp 1 and the outer surface 21 of the reflector dish 7 may be alternatively obtained by providing the proximal lip 17 with an inward bias, for example as shown in Figures 26, 27 , 34, 35 , 38, 39 , 42, 43 , 46 and 47 .
  • an inward bias for example as shown in Figures 26, 27 , 34, 35 , 38, 39 , 42, 43 , 46 and 47 .
  • the material requirements for the band clamp 1 may be reduced in a trade-off with ease of assembly.
  • a distal sidewall 47 of the proximal lip 17 may be provided with an annular protrusion 49 which contacts the reflector dish 7, for example as shown in Figures 34 and 35 .
  • the inward end 25 operates as an assembly guide for the band clamp 1 over the reflector dish 7 and radome 3, prior to engaging the interference fit as the band clamp 1 is inserted far enough for the annular protrusion 49 to enage the reflector dish 7 in the interference fit.
  • the band clamp 1 may be dimensioned with a transition between the distal lip 15 and the proximal lip 17 formed as a continuous arc segment 51.
  • a material stress applied to the transition to create the bias between the distal lip 15 and the proximal lip 17 against the reflector dish 7 may be distributed across a larger portion of material, instead of being concentrated in the outer corners 31 demonstrated in the other embodiments.
  • the outer diameter of the band clamp 1 (the transition between the distal lip 15 and the proximal lip 17) may be provided with a choke groove 45 open to the outer diameter of the band clamp 1.
  • the disclosed band clamp 1 can enable significant manufacturing, delivery, installation and/or maintenance efficiencies. Because the band clamp 1 enables simplified radome and reflector dish periphery geometries, the resulting reflector antenna 13 may have improved materials and manufacturing costs. Because the band clamp 1 is simply and securely attached, installation and maintenance may be simplified compared to prior reflector antenna configurations with complex peripheral geometries, delicate back lobe suppression ring coatings, platings and/or RF absorbing materials. Because the band clamp 1 may be compact and applied close to the reflector antenna aperture H, the overall diameter of the reflector antenna 13 may be reduced, which can reduce the reflector antenna wind loading characteristics and the required packaging dimensions.
  • band clamp 1 is fabricated utilizing extrusion, injection molding, progressive punching and/or stretch forming
  • complex band clamp 1 cross sections providing additional electrical performance may be provided in the form of a protruding portion 37 with specific geometries, without requiring separate elements with additional attachment and/or reliability concerns.

Landscapes

  • Aerials With Secondary Devices (AREA)
  • Clamps And Clips (AREA)

Claims (14)

  1. Bandklemme (1), die dafür ausgelegt ist, ein Radom (3) an ein distales Ende (5) einer Reflektorschale (7) zu koppeln, wobei die Bandklemme umfasst:
    ein Band mit einer nach innen vorstehenden proximalen Lippe (17), die über einen Breitenabschnitt (A) mit einer nach innen vorstehenden distalen Lippe (15) verbunden ist; und
    einen vorstehenden Abschnitt (37), der sich vom Breitenabschnitt (A) der Bandklemme (1) an einer Seite der proximalen Lippe (17) erstreckt und dafür ausgelegt ist, ein Vor-Rück-Verhältnis, F/B, einer Reflektorantenne, die die Reflektorschale (7) umfasst, zu verbessern;
    wobei die distale Lippe (15) mit einem Innendurchmesser bemessen ist, der kleiner oder gleich einer Reflektoröffnung der Reflektorschale (7) ist;
    wobei die proximale Lippe (17) so bemessen ist, dass sie mit einer Außenfläche der Reflektorschale (7) in einer Presspassung in Eingriff kommt; und
    dadurch gekennzeichnet, dass:
    die proximale Lippe (17), die distale Lippe (15) und der vorstehende Abschnitt (37) einen einheitlichen, zusammenhängenden Abschnitt bilden; und
    der vorstehende Abschnitt (37) sich über eine Breite des Breitenabschnitts der Bandklemme erstreckt.
  2. Bandklemme nach Anspruch 1, wobei die proximale Lippe mit einem Umkehrbereich (19) bereitgestellt ist, der so bemessen ist, dass er mit einer Außenfläche (21) eines Signalbereichs (23) der Reflektorschale (7) in Eingriff kommt.
  3. Bandklemme nach Anspruch 1, wobei eine distale Kante (39) des vorstehenden Abschnitts gezahnt (41) ist.
  4. Bandklemme nach Anspruch 1, wobei eine distale Kante (39) des vorstehenden Abschnitts zackenförmig (43) ist.
  5. Bandklemme nach Anspruch 1, wobei sich der vorstehende Abschnitt (37) in Richtung eines proximalen Endes (27) der Reflektorschale (7) erstreckt.
  6. Bandklemme nach Anspruch 1, wobei der vorstehende Abschnitt (37) eine Länge aufweist, die als ein Vielfaches einer Viertelwellenlänge einer gewünschten Betriebsfrequenz der Reflektorschale (7) bemessen ist.
  7. Bandklemme nach Anspruch 1, wobei sich der vorstehende Abschnitt (37) in einem Winkel von etwa 60 Grad von der Längsachse der Reflektorschale (7) nach außen erstreckt.
  8. Bandklemme nach Anspruch 1, wobei sich der vorstehende Abschnitt (37) von einem Außendurchmesser der Bandklemme aus erstreckt; der vorstehende Abschnitt mindestens eine Drosselnut (45) bildet, die zum distalen Ende (5) der Reflektorschale (7) offen ist.
  9. Bandklemme nach Anspruch 8, wobei eine Breite der mindestens einen Drosselnut (45) als ein Vielfaches einer Viertelwellenlänge einer gewünschten Betriebsfrequenz der Reflektorschale (7) bemessen ist.
  10. Bandklemme nach Anspruch 8, wobei die mindestens eine Drosselnut (45) aus zwei konzentrischen Drosselnuten besteht.
  11. Bandklemme nach Anspruch 1, wobei in einem Außendurchmesser des Bandes eine zu einem Außendurchmesser des Bandes offene Drosselnut (45) bereitgestellt ist.
  12. Verfahren zur Herstellung einer Bandklemme (1), die dafür ausgelegt ist, ein Radom (3) an ein distales Ende (5) einer Reflektorschale (7) zu koppeln, umfassend die folgenden Schritte:
    Bilden eines Bandes mit einer nach innen vorstehenden proximalen Lippe (17), die über einen Breitenabschnitt (A) mit einer nach innen vorstehenden distalen Lippe (15) verbunden ist, und einem vorstehenden Abschnitt (37), der sich vom Breitenabschnitt (A) der Bandklemme (1) an einer Seite der proximalen Lippe (17) erstreckt;
    wobei die distale Lippe mit einem Innendurchmesser bemessen ist, der kleiner oder gleich einer Reflektoröffnung der Reflektorschale ist;
    wobei die proximale Lippe (17) so bemessen ist, dass sie mit einer Außenfläche der Reflektorschale (7) in einer Presspassung in Eingriff kommt;
    wobei der vorstehende Abschnitt dafür ausgelegt ist, das Vor-Rück-Verhältnis, F/B, einer Reflektorantenne, die die Reflektorschale (7) umfasst, zu verbessern; und
    dadurch gekennzeichnet, dass:
    die proximale Lippe (17), die distale Lippe (15) und der vorstehende Abschnitt (37) als ein einheitlicher, zusammenhängender Abschnitt gebildet sind; und
    der vorstehende Abschnitt (37) sich über eine Breite des Breitenabschnitts der Bandklemme erstreckt.
  13. Verfahren nach Anspruch 12, wobei das Band durch Extrusion gebildet wird.
  14. Verfahren nach Anspruch 12, wobei das Band durch Streckziehen geformt wird.
EP13833558.3A 2012-08-31 2013-05-08 Bandklemme zur befestigung an einem radom Active EP2891211B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US13/600,544 US9083083B2 (en) 2009-12-11 2012-08-31 Radome attachment band clamp
PCT/US2013/040130 WO2014035493A1 (en) 2012-08-31 2013-05-08 Radome attachment band clamp

Publications (3)

Publication Number Publication Date
EP2891211A1 EP2891211A1 (de) 2015-07-08
EP2891211A4 EP2891211A4 (de) 2016-04-20
EP2891211B1 true EP2891211B1 (de) 2022-02-16

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP13833558.3A Active EP2891211B1 (de) 2012-08-31 2013-05-08 Bandklemme zur befestigung an einem radom

Country Status (4)

Country Link
EP (1) EP2891211B1 (de)
CN (1) CN104685711B (de)
BR (1) BR112015003156B1 (de)
WO (1) WO2014035493A1 (de)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2267839A2 (de) * 2009-06-12 2010-12-29 Andrew LLC Radom und Verkleidung für Spiegelantenne

Family Cites Families (7)

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Publication number Priority date Publication date Assignee Title
CA887303A (en) 1971-11-30 H. Hansen Laurence Backlobe reduction in reflector-type antennas
US4710777A (en) * 1985-01-24 1987-12-01 Kaultronics, Inc. Dish antenna structure
US5729241A (en) * 1996-05-28 1998-03-17 Ergen; Charles W. Direct broadcast satellite antenna cover
WO2001057954A1 (en) * 2000-02-04 2001-08-09 Satellite Mobile Systems, Inc. Edge guard for a signal receiving device deployably mounted to a vehicle
US7138958B2 (en) * 2004-02-27 2006-11-21 Andrew Corporation Reflector antenna radome with backlobe suppressor ring and method of manufacturing
CN201369389Y (zh) * 2009-01-13 2009-12-23 广东盛路通信科技股份有限公司 一种提高天线前后比的屏蔽环结构
US8259028B2 (en) * 2009-12-11 2012-09-04 Andrew Llc Reflector antenna radome attachment band clamp

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2267839A2 (de) * 2009-06-12 2010-12-29 Andrew LLC Radom und Verkleidung für Spiegelantenne

Also Published As

Publication number Publication date
BR112015003156A8 (pt) 2017-12-26
EP2891211A1 (de) 2015-07-08
WO2014035493A1 (en) 2014-03-06
CN104685711A (zh) 2015-06-03
EP2891211A4 (de) 2016-04-20
CN104685711B (zh) 2017-05-31
BR112015003156A2 (pt) 2017-07-04
BR112015003156B1 (pt) 2022-04-19

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