WO2008098575A1 - Antenne - Google Patents

Antenne Download PDF

Info

Publication number
WO2008098575A1
WO2008098575A1 PCT/DK2007/000456 DK2007000456W WO2008098575A1 WO 2008098575 A1 WO2008098575 A1 WO 2008098575A1 DK 2007000456 W DK2007000456 W DK 2007000456W WO 2008098575 A1 WO2008098575 A1 WO 2008098575A1
Authority
WO
WIPO (PCT)
Prior art keywords
antenna
shell
flagpole
top end
cavity
Prior art date
Application number
PCT/DK2007/000456
Other languages
English (en)
Inventor
Søren Risskov KNUDSEN
Klaus Refstrup Mulbjerg
Original Assignee
Sat-Com Teknik Aps
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sat-Com Teknik Aps filed Critical Sat-Com Teknik Aps
Publication of WO2008098575A1 publication Critical patent/WO2008098575A1/fr

Links

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
    • H01Q1/1228—Supports; Mounting means for fastening a rigid aerial element on a boom
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/06—Means for the lighting or illuminating of antennas, e.g. for purpose of warning
    • 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
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/44—Details of, or arrangements associated with, antennas using equipment having another main function to serve additionally as an antenna, e.g. means for giving an antenna an aesthetic aspect

Definitions

  • the present invention relates to an antenna having a shell which is adapted for attachment to a top end of a flagpole.
  • antennas are positioned on a relatively high pole in order to optimize receiving of signals. Furthermore, the position of the antennas may advantageously be substantially unobstructed. This way of mounting antennas may as an example cause aesthetic problems. In addition hereto, traditional antennas may at some places be prohibited by zoning regulations.
  • the present invention provides an antenna comprising a shell which is adapted for attachment to a top end of a flagpole and which houses a receiving structure capable of amplifying an electromagnetic signal, the shell forming a cavity dimensioned to receive the top end of a flagpole, the shell further comprising a guide for a flag cord.
  • the shell may be dome-formed, finial-formed, or substantially ball-formed. Depending on the place of use, other shapes may also be applicable. Thus, the shell may be differently shaped according to tradition and/or fashion of a top element of a flagpole at different places.
  • the shell may form a closed compartment.
  • the shell may be openable in order to allow access to the interior thereof.
  • the shell may comprise at least two parts being attachable to each other by a connection structure.
  • the shell parts may furthermore be sealed to moisture protect the interior, e.g. by coating the shell, filling the interior with a suitable compound or just coating the electronic parts with such a compound.
  • the connection between the shell parts may be weatherproofed by the use of an O-ring or a gasket.
  • the receiving structure may be omnidirectional allowing for signals to be received from all directions.
  • the receiving structure may be an aerial wire positioned in the interior of the shell.
  • the aerial wire may be positioned along the periphery of the shell.
  • the shell may have a material thickness being uneven, i.e. at some areas the material thickness of the shell may be smaller that at other areas.
  • the larger thickness may be an advantage in order to protect the interior of the shell, whereas a decreased thickness may be an advantage for the receiving structure in order to properly receive signals.
  • the antenna may be provided with an uneven material thickness.
  • the material thickness of a part of the shell is in the range of 1-3 mm. This may improve the performance of the antenna by broadening the vertical directional characteristic of the receiving structure.
  • the relative narrow vertical directional characteristic may cause the signal output level from the antenna to vary when the flagpole sways, e.g. due to strong winds.
  • connection structure which may be provided to allow for connection of different shell parts, may comprise an internal threading on the one part and an external threading on the other part.
  • connection structure may comprise a bolt and nut or a plurality thereof in order to connect the shell parts.
  • Other connection structures may also be applicable.
  • the cavity formed by the shell may as an example be an indentation e.g. in the bottom part of the shell, the indentation being dimensioned to receive the top end of a flagpole.
  • the receiving structure may be able to receive signals from a large frequency range, such as a frequency range from e.g. 30 to 1000 MHz, and in particular the range of 47-862 MHz, a range comprising e.g. the VHF, UHF and FM bands (Very High Frequency, Ultra High Frequency and Frequency Modulation).
  • signals for digital television (DVB - Digital Video Broadcast) and digital radio (DAB - Digital Audio Broadcast) may be received.
  • a flag is raised by the use of a flag cord.
  • the flag may thus be fixed to one end of the flag cord and raised by pulling the other end thereof.
  • the shell comprises a guide for the flag cord.
  • the guide may in a simple embodiment be an aperture in the shell allowing for passage of the flag cord.
  • the antenna may be provided with a cable exit hole within the cavity, which allows a cable to be fed through the flagpole to the earth.
  • a cable output hole outside the cavity may be provided, so that a cable can be led down on the outside of the flagpole.
  • the antenna may further comprise a transmitting structure for transmitting the electromagnetic signal wirelessly.
  • the antenna may thus be wireless or in cable contact with one or more radios and/or televisions in an adjacent building.
  • the antenna may comprise a transmitting structure for transmitting the signal to a dedicated receiver.
  • Positioning the antenna on top of a flagpole may further have the advantage that interference from different electromagnetic sources within an adjacent building is minimized or even avoided.
  • the guide may comprise a guide element made of a material which is not magnetically, preferably nor electromagnetically, conductive, e.g. made from stainless steel or nylon, in order not to disturb or alter the directional characteristic of the receiving structure.
  • the antenna may further comprise a decoder for transmitting the signal digitally.
  • analog signals which have been received may be converted to digital signals before being transmitted e.g. to an amplifier.
  • an amplifier e.g. an analogue amplifier, may be housed in the shell. As an example, this amplifier may be supplied with electricity via the output cable in order to minimize cabling.
  • the antenna may additionally comprise a light source which may be provided in order to indicate a direction which is significant for a characteristic of the receiving structure.
  • the receiving structure which may be omnidirectional may not be evenly sensitive in all directions. This may have the advantage that both weak and strong signals may be received at the same time without overloading the weak signals with the strong signals. This may be achieved by orienting the antenna so that its less sensitive direction points towards the source of the stronger signals.
  • the light source which e.g. may be a light emitting diode (LED) may be used to indicate a direction in which the receiving structure is especially sensitive to weak signals, thereby facilitating orientation of the shell when attaching it to the top end of a flagpole.
  • the light source may be used as an indication of power status and thereby as an indication of whether the antenna, a transmitter, an amplifier, etc. lack power.
  • the flag When the wind blows from differing directions, the flag may be wound around the flagpole, if the flag cord is connected to a shell being locked to the top end of the pole.
  • the antenna may further comprise a rotation structure.
  • the rotation structure may be provided to facilitate rotational attachment of the shell to the top end of a flagpole.
  • the shell may rotate together with the flag allowing for unhindered flying of the flag.
  • At least the guide, but not necessarily the entire shell could be rotationally attached to allow the flag to move unhindered around the flagpole.
  • the antenna may further comprise a spring structure which may be provided to rotate the shell back to an initial position after rotation thereof, when being attached to the top end of a flagpole. If the wind has rotated the shell, a built-in spring structure may return the shell to its initial position when the wind has calmed down again. Especially, if the characteristic of the receiving structure is uneven, this may be an advantage.
  • the spring may further prevent that a cable connected to the antenna is damaged due to twisting thereof. If the shell by influence of the wind is rotated a number of times in the same direction, one or more cables being attached to the shell may be damaged.
  • the flag cord in some embodiments may be situated in the interior of a hollow flagpole, the spring connection may furthermore prevent cables and the flag cord being twisted together and consequently prevent damaging thereof.
  • the antenna may further comprise a cavity adapter which may be provided to facilitate receiving of a top end of flagpoles being differently dimensioned.
  • the cavity adapter may comprise a tube which fits into the cavity of the shell. Having a tube with variable inner diameter, the cavity may be able to receive flagpoles of different diameters.
  • the antenna may comprise a photovoltaic panel to provide the receiving structure with current.
  • the photovoltaic panel may produce electricity from incident light thereby decreasing or, in combination with an accumulator which may also be comprised by the antenna, eliminating the need for providing the antenna with external current.
  • the antenna may comprise one or more weather sensors, such as a rain gauge, a barometer, a thermometer, an anemometer, etc.
  • the antenna may also comprise other forms of sensors, such as a GPS receiver (Global Positioning System), which could e.g. be used to derive an accurate time signal for connected signal recording equipment.
  • GPS receiver Global Positioning System
  • Fig. 1 illustrates an antenna and an adjacent building
  • Fig. 2 illustrates a shell comprising two shell parts
  • Fig. 3 illustrates an aerial wire
  • Fig. 4 illustrates a bottom shell part
  • Fig. 5 illustrates mounting of a cavity adapter
  • Fig. 6 illustrates the aerial wire mounted on the bottom shell part
  • Fig. 7 illustrates connection of two shell parts
  • Fig.8 illustrates a shell ready for mounting on a flagpole
  • Fig. 9 illustrates a cavity adapter for an antenna.
  • Fig. 1 illustrates an embodiment of an antenna 1 according to the invention.
  • the antenna 1 comprises a shell 2 which is adapted for attachment to a top end of a flagpole 3 and which houses a receiving structure capable of amplifying an electromagnetic signal.
  • the shell 2 forms a cavity 4 (see Fig. 5) which is dimensioned to receive the top end of the flagpole 3.
  • the shell 2 comprises a guide 5 (see Fig. 2) for a flag cord (not shown).
  • the antenna 1 is capable of transmitting the signals to radios and televisions 6 in an adjacent building 7 by a cable 8 partly positioned internally in the flagpole 3 and partly being laid in the ground (illustrated by the dotted line).
  • the antenna 1 comprises an amplifier 9 (see Fig. 3), preferably with a gain in the range 22-32 dB.
  • the amplifier 9 and/or other parts of the antenna 1 are supplied with power from the output cable 8 from a broad-band amplifier placed in the building 7.
  • the antenna 1 may comprise means for transmitting its output signal to the receiving equipment 6 in the building 7 wireless or via optical fibres in order to reduce the risk of damage to indoor installations in case a lightning strikes the flagpole 3.
  • Fig. 2 illustrates the shell 2 which comprises two shell parts, a top shell part 10 and a bottom shell part 11.
  • the two shell parts 10, 11 can be connected by the use of a bolt (not shown) which is inserted in the aperture 12 in the top shell part 10 and subsequently being connected to an internal threading of the aperture 13 in the bottom shell part 11.
  • the flag cord (not shown) is guided in guide 5 which is formed by a guide aperture 14 (see Fig. 5) in the bottom surface of the bottom shell part 11 and guide element in the form of a transverse structure 15 arranged across the aperture.
  • the cord is inserted into the aperture on one side of the transverse structure 15 and exits on the other side of the transverse structure 15.
  • the transverse structure 15 forms a smoothly rounded upward surface which carries the flag cord and on which the cord may move essentially without any wear.
  • the transverse structure 15 may be made from stainless steel, nylon, or another material which is not magnetically, preferably not electromagnetically, conductive, in order not to disturb or alter the directional characteristic of the receiving structure.
  • Fig. 3 illustrates a receiving structure in the form of an aerial wire 16 to be inserted in the shell 2.
  • the aerial wire 16 is omnidirectional, but due to the discontinuity at the linkage point 17 to the built-in analogue amplifier 9, the receiving structure is not evenly sensitive in all directions. This has the advantage that both strong and weak signals can be received at the same time, without overloading the weak signals with the strong signals.
  • a light emitting diode LED
  • the LED may further be used to indicate status information from the decoder or amplifier 9.
  • the LED could, e.g. by flashing, indicate that a useful signal is being received from a signal source.
  • An LED aperture 18 is provided at the bottom shell part 11 as illustrated in Fig. 4.
  • the aerial wire 16 is preferably placed close to the inner periphery of the shell 2.
  • the thickness of the shell material on the outside of the aerial wire 16 is preferably 1-3 mm or more preferably approximately 2 mm, since it has been found that this improves the performance of the antenna 1 by broadening the vertical directional characteristic of the aerial wire 16. Without this feature, the relative narrow vertical directional characteristic may cause the signal output level from the antenna 1 to vary when the flagpole 3 sways, e.g. due to strong winds.
  • Fig. 5 is an illustration of the bottom shell part 11 seen from below.
  • the flag cord (not shown) can be inserted in the guide 5 via the guide aperture 14.
  • the cavity 4 is dimensioned to receive a top end of a flagpole 3. Due to different diameters of different flagpoles 3, a cavity adapter 19 can be used to change the inner diameter of the cavity 4.
  • the cavity adapter 19 is a plastic tube having a smaller inner diameter at the one end than at the other end (see also Fig. 9).
  • the shell 2 fits a flagpole 3 having a top end with a larger diameter due to the enlarged diameter of one end of the cavity adapter 19.
  • Fig. 6 is an illustration of a bottom shell part 11 being equipped with a cavity adapter 19, an aerial wire 15, and an amplifier 9.
  • the top shell part 10 is being positioned on the bottom shell part 11.
  • Fig. 8 is an illustration of a shell 2 which is ready to be attached to a top end of a flagpole 3.
  • An attached coaxial cable 20 is coiled and positioned ready to use inside the cavity adapter 19.
  • the antenna 1 may be provided with a cable exit hole within the cavity 4, which allows the cable 20 to be fed through the flagpole to the earth. Alternatively or additionally, a cable output hole outside the cavity 4 may be provided, so that the cable 20 can be led down on the outside of the flagpole 3.
  • Fig. 9 illustrates an example of a cavity adapter 19 according to the invention. If an enlarged inner diameter is not applicable, the lower part of the cavity adapter 19 can be cut off at the dotted line 21.

Landscapes

  • Details Of Aerials (AREA)
  • Support Of Aerials (AREA)

Abstract

L'invention concerne une antenne qui comprend une enveloppe adaptée pour être fixée à l'extrémité supérieure d'un mât. L'enveloppe reçoit une structure de réception capable d'amplifier un signal électromagnétique. De plus, l'enveloppe forme une cavité dimensionnée pour recevoir l'extrémité supérieure d'un mât et comporte un guide pour un cordon de drapeau.
PCT/DK2007/000456 2007-02-13 2007-10-26 Antenne WO2008098575A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DKPA200700232 2007-02-13
DKPA200700232 2007-02-13

Publications (1)

Publication Number Publication Date
WO2008098575A1 true WO2008098575A1 (fr) 2008-08-21

Family

ID=38870308

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DK2007/000456 WO2008098575A1 (fr) 2007-02-13 2007-10-26 Antenne

Country Status (2)

Country Link
DK (1) DK200900106U3 (fr)
WO (1) WO2008098575A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE9113065U1 (de) * 1991-10-21 1991-12-12 Julius Cronenberg oH, 5760 Arnsberg Kappe für Fahnenmaste
WO1995021307A1 (fr) * 1994-02-01 1995-08-10 Strömblad, Ab Gustav Fixation d'embout d'extremite de mat de pavillon
WO2001078190A1 (fr) * 2000-04-06 2001-10-18 So.L.E. Societa' Luce Elettrica S.P.A. Tour legere pourvue d'une station radio de base destinee a la telephonie mobile

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE9113065U1 (de) * 1991-10-21 1991-12-12 Julius Cronenberg oH, 5760 Arnsberg Kappe für Fahnenmaste
WO1995021307A1 (fr) * 1994-02-01 1995-08-10 Strömblad, Ab Gustav Fixation d'embout d'extremite de mat de pavillon
WO2001078190A1 (fr) * 2000-04-06 2001-10-18 So.L.E. Societa' Luce Elettrica S.P.A. Tour legere pourvue d'une station radio de base destinee a la telephonie mobile

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PACIFIC WIRELESS: "FLAGPOLE STEALTH ANTENNA", 10 February 2006 (2006-02-10), XP002464269, Retrieved from the Internet <URL:http://www.pacwireless.com/products/FlagTenna_DataSheet.pdf> [retrieved on 20080111] *

Also Published As

Publication number Publication date
DK200900106U1 (da) 2009-08-14
DK200900106U3 (da) 2009-09-11

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