EP0322498A2 - Primärstrahler für Parabolantenne - Google Patents

Primärstrahler für Parabolantenne Download PDF

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Publication number
EP0322498A2
EP0322498A2 EP88103388A EP88103388A EP0322498A2 EP 0322498 A2 EP0322498 A2 EP 0322498A2 EP 88103388 A EP88103388 A EP 88103388A EP 88103388 A EP88103388 A EP 88103388A EP 0322498 A2 EP0322498 A2 EP 0322498A2
Authority
EP
European Patent Office
Prior art keywords
radio wave
covering member
aperture
primary radiator
illumination
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Withdrawn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
EP88103388A
Other languages
English (en)
French (fr)
Other versions
EP0322498A3 (de
Inventor
Nobutaka Inoue
Seiichi Honma
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.)
Maspro Denkoh Corp
Original Assignee
Maspro Denkoh Corp
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 Maspro Denkoh Corp filed Critical Maspro Denkoh Corp
Publication of EP0322498A2 publication Critical patent/EP0322498A2/de
Publication of EP0322498A3 publication Critical patent/EP0322498A3/de
Withdrawn legal-status Critical Current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
    • H01Q1/42—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
    • H01Q19/06—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 refracting or diffracting devices, e.g. lens
    • H01Q19/08—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 refracting or diffracting devices, e.g. lens for modifying the radiation pattern of a radiating horn in which it is located

Definitions

  • the present invention relates to a primary radi­ator used in a parabolic antenna for receiving radio waves such as microwave, millimeter wave and the like. More particularly, the invention relates to a primary radiator having the radio wave receiving opening covered with a covering member, thereby pre­venting incoming of dusts from the opening toward the interior.
  • a primary radiator In a primary radiator, if dust is incoming from a radio wave receiving opening provided on its one end, then the dust comes to stick on a receiving member provided on the other end through an internal space in the primary radiator. As a result, insula­tions degrade in the receiving member, leading to a defective operation.
  • the radio wave comes into the primary radiator by way of the aforementioned covering member, there­fore the covering member is capable of giving a loss to the radio wave.
  • the covering member was formed as thin as possible in the past, thereby minimizing the aforementioned loss.
  • the covering member is easily broken down to lose its dust protective effect.
  • a first object of the invention is to provide a primary radiator for which incoming of dusts can be prevented by a covering member.
  • a second object of the invention is to provide a primary radiator for which a covering member is formed to a satisfactory thickness, thus the cover­ing member ensuring a mechanical strength full to an impression of external forces such as pecking by birds, hitting by foreign matters and so forth.
  • a third object of the invention is to provide a primary radiator for which a loss of radio wave due to a covering member formed to a large thickness, as required, can be minimized to the utmost extent, thereby receiving radio waves efficiently.
  • a thickness of the aforemen­tioned covering member is selected to the thickness coincident with the trough in a transmission loss curve of radio wave of a synthetic resin material used for formation.
  • the thickness can be adjusted to a thickness sufficiently large to obtain a required mechanical strength, and at the same time, even such large thickness is substantial enough to minimize a loss to arise in the process of the radio wave trans­mitting the covering member.
  • a reference numeral 1 denotes a pri­mary radiator used for receiving a 12 GHz band radio wave as one example of a microwave.
  • the primary radiator 1 comprises a cylindrical body 2 indicated as one example of a radio wave introducing member, and a covering member 3 provided on the nose thereof.
  • the body 2 is formed cylindrically by means of a conductive material such as copper, aluminum alloy, brass or the like.
  • a reference nu­meral 4 denotes a waveguide part, which is 21 mm, for example, in inside diameter. This may be a circular waveguide corresponding to C-120 of IEC Standards.
  • a reference numeral 5 denotes a horn part ranging to one end of the waveguide part 4, with its inside working as an illumination aperture 6 for receiving radio waves.
  • a reference numeral 7 denotes an aper­ture end of the horn part 5.
  • a frequency converter 8 is coupled to the other end of the waveguide part 4.
  • a reference numeral 9 denotes a receiving member, comprising a cavity for resonance 9a and a probe 9b provided therein.
  • a radio wave of waveguide mode coming into the cavity 9a through the waveguide part 4 is extracted as a signal of coaxial mode by the probe 9b.
  • the extracted signal is given to a frequency conversion circuit provided within a case 8a of the frequency converter 8, not indicated but known so well, and is converted into a signal with lower frequency there.
  • a reference numeral 10 denotes a collar for mounting the covering member which is provided on an outer periphery side of the nose portion in the body 2, with a male screw 11 formed on its outer periphery.
  • a reference numeral 12 denotes a recessed groove, which is formed annu­larly, and a waterproof ring packing 13 is provided therein.
  • the covering member 3 is formed of a syn­thetic resin material (or polycarbonate, for example).
  • a reference numeral 15 denotes a block part for blocking the illumination aperture 6.
  • a reference nu­meral 17 denotes a radio wave receiving domain for allowing the incoming radio wave to pass toward the illumination aperture 6.
  • An outside 17a and an in­side 17b of the domain 17 are formed spherically around (spherical center) a common point F.
  • a thick­ness t of the receiving domain 17 is formed to the thickness (a size obtainable through multiplying half of the received radio wavelength by a velocity factor (0.6 in the case of polycarbonate) correspond­ting to a material of the covering member 3, which is 8.3 mm in the example) coincident with a first trough in the transmission loss curve of radio wave of the synthetic resin which is a material for form­ing the covering member 3. Then, a radius of the inside 17b is 20.8 mm long.
  • Two-dot chain lines 18, 18 indicate a radio wave receivable range of the aforementioned receiving domain 17.
  • a reference nu­meral 16 denotes a cylindrical takeout part. The takeout part 16 displaces the receiving domain 17 somewhat ahead of the aperture end 7 of the horn 5.
  • the aforementioned point F comes to position within the illumination aperture 6 on an inside of the horn 5. Further, the point F is positioned on an axis of the illumination aperture 6.
  • radio waves focus­ing toward the point F as will be described herein­later pass through any portions of the receiving domain 17 all on equal conditions. Accordingly, the radio waves can be received efficiently within the horn 5.
  • the point F may be located on the central axis of the horn 5 at a position longitudinal of a side of the receiving domain 17 or the wave­guide part 4 in the range of one fourth wavelength or so from the inside of the horn 5.
  • the aforemen­tioned takeout part 16 is formed generally to the thickness in the same degree as the receiving domain 17, however, it may be thinned or thickened subject to obtaining a necessary and satisfactory strength. In case then where the aforementioned point F is positioned inside the horn part 5 as mentioned above without the takeout part 16, the takeout part 16 will not particularly be formed.
  • a reference numeral 19 denotes a mounting member formed inte­grally with the block part 15, which is intended for installing the covering member 3 on the body 2.
  • the member 19 is formed annularly to have a step 20 in­termediately and has a female screw 21 mating with the male screw 11 formed thereon.
  • the mounting mem­ber 19 thick likewise can be formed integrally with the block part 15. This may be serviceable to omis­sion of a separate part for mounting the covering member 3 on the body 2. Then, an end surface 20a of the step 20 is brought into contact watertightly with the aforementioned packing 13.
  • the block part 15 shields the illumination aperture 6, even if a dust happens to cover the primary radiator 1 in outdoor service, the dust is prevented from coming into the primary radiator 1. As a result, a deterioration of electrical characteristics due to denaturation of the inside of the horn part 5 or the waveguide part 4 can be prevented. Then, in the frequency converter 8 mounted on the other end of the waveguide part 4, the dust is not capable of depositing on the surface of an insulating member 9c, thus preventing a deterioration of insulation between the probe 9b and inside of the cavity 9a which may lead to a defective operation.
  • the block part 15 since the block part 15 is so thick, a failure of the block part is prevented despite hitting by stones blown by the wind or pecking by birds. Further, the block part 15 is thick, as described above, enough to with­stand long a weathering by sunbeams or rain and wind, thus serving for a long period of time. Still fur­ther, the end surface 20a is brought into contact close with the packing 13, therefore rain water is prevented from coming into the primary radiator 1. As a result, a corrosion of the inside of the horn part 5 or the waveguide part 4 and a failure of the receiving member 9 can be prevented.
  • a 12 GHz radio wave coming from left of Fig. 1 in the receivable ranges 18, 18 passes through the radio wave receiv­ing domain 17 and comes into the illumination aper­ture 6 of the horn part 5.
  • the incoming radio wave propagates in the interior of the horn part 5 and the waveguide part 4 as known well, reaches the fre­quency converter 8, and is received by the receiving member 9.
  • FIG. 2 indicates a relation between thick­ness and transmission loss of radio wave of polycar­bonate used as a forming material for the covering member 3.
  • A indicates a transmission loss curve at received radio wave frequency being 12 GHz (satellite broadcasting)
  • B indicates that at 23 GHz (CATV relaying)
  • C indicates that at 50.5 GHz (simplicity radio).
  • a thickness of the radio wave receiving domain 17 is that of coinciding with a first trough of the curve A as indicated by a reference charac­ter A1 in the curve A.
  • the transmission loss of radio wave due to the covering member 3 is gen­erally acceptable when it is about 0.3 dB or below. Accordingly, the aforementioned trough implies a range wherein the transmission loss is about 0.3 dB or below.
  • a transmission loss to the 23 GHz radio wave is minimized in the case of covering member having a radio wave receiving domain 4.3 mm thick as indicated by a reference character B1.
  • it can be utilized as a covering member in the primary radiator for receiving 23 GHz radio wave.
  • a covering member having a radio wave receiv­ing domain 8.7 mm thick as indicated by a reference character B2 can be utilized likewise on the primary radiator for receiving 23 GHz radio wave.
  • first and second troughs in the curve B are utilized each.
  • covering members having radio wave receiving domains 2 mm, 4 mm and 6 mm thick each as indicated, for example, by reference characters Cl, C2, C3 have small transmission loss to the 50.5 GHz radio wave each, therefore they can be utilized on a primary radiator for receiving the radio wave.
  • first, second and third troughs in the aforementioned curve are utilized each. These may be tabulated as shown in Table 1.
  • the radio wave receiving domain 17 is even in thickness everywhere to the radio waves in the range. Accordingly, if the receiving domain 17 is thick to coincide with the trough of higher order to be several times (double, treble, quadruple, for example) as long as the received wavelength, the radio waves incoming through the aforementioned range are capable of passing through the receiving domain 17 and coming into the illumi­nation aperture 6 with less loss.
  • the cover­ing member having a thick radio wave receiving domain as mentioned can be developed.
  • the covering member having a radio wave receiving domain formed somewhat thicker than 8.3 mm indicated by Al can be utilized as a covering member in the primary radi­ator for receiving a radio wave 10 GHz or so which is somewhat lower than 12 GHz.
  • the first trough is utilized as a covering member in the primary radiator for receiving a radio wave 25 GHz or so which is some­what higher than 23 GHz.
  • the covering members having radio wave receiving domains formed somewhat thinner than 4.3 mm, 8.7 mm indicated by Bl, B2 respectively can be utilized.
  • the first or second trough is utilized as a covering member in the primary radiator for receiving a radio wave 25 GHz or so which is some­what higher than 23 GHz.
  • a reference numeral 24 denotes a reflector for the parabolic antenna, which is mounted on an upper portion of a strut (mast) 25 with its lower end fixed on the ground plane or structure by means of a known fixture 26.
  • a reference numeral 27 de­notes an arm with its base fixed on the reflector 24, and the primary radiator 1 is mounted on its nose portion. Then, the mounting comes in a state where a focal point of the reflector 24 coincides with the point F in the primary radiator 1.
  • a reference numeral 28 denotes a frequency converter connected to a rear end of the waveguide part 4 in the primary radiator 1.
  • SHF radio wave arriving from a broadcasting satellite is reflected by the reflector 24 and focused toward the primary radiator 1.
  • the afore­mentioned radio wave passes through the covering member 3 and comes thereinto from the illumination aperture 6, and is then given to the frequency con­verter 28.
  • the frequency converter 28 converts the radio wave into a signal with a lower frequency as known well and sends it toward a tuner.
  • the above-described parabolic antenna is that for receiving a radio wave (11.7 to 12.0 GHz) from the broadcasting satellite as SHF radio wave.
  • the parabolic antenna comes in a parabolic antenna for receiving 12 GHz radio wave from a com­munication satellite, a parabolic antenna for send­ing 14 GHz radio wave toward the communication sat­ellite, a parabolic antenna for sending/receiving 3 to 50 GHz microwave and millimeter wave and so forth.
  • Fig. 4 represents another embodiment of the invention, giving an example wherein a radio wave receiving domain 17e in a covering member 3e is formed to have a 16.6 mm thickness (size obtained through multiplying a received radio wavelength by the velocity factor).
  • the thickness coincides with the second trough in the curve A as indicated by A2 in Fig. 2.
  • a transmission loss is small (thickness coincident with the fourth trough) also to the 23 GHz radio wave as indicated by B4, therefore it is available for receiving the 23 GHz radio wave.
  • Fig. 5 represents a further embodiment of the invention, giving an example wherein a radio wave receiving domain 17f in a covering member 3f is formed (thickness coincident with the third trough of the curve A as apparent from A3 in Fig. 2) to have a 24.9 mm thickness (size obtained through mul­tiplying 1.5 times of a received radio wavelength by the velocity factor).
  • a thickness of the radio wave receiving domain may be given at values shown in Table 2.
  • Table 2 Material Dielectric constant ⁇ r Thickness of radio wave receiving domain (mm) Using 1st trough Using 2nd trough Using 3rd trough Polyallylate 3.6 7.3 14.6 22.0 Unsaturated polyester 4.0 6.9 13.9 20.8
  • FIG. 7 represents a further different em­bodiment of the invention, giving an example wherein the block part is formed like a flat plate (curved surface infinite in radius).
  • a covering member 3g provided with a plate-like block part 15g is formed, for example, of polyphenylene oxide.
  • a thickness tl of the plate-like block part 15g is formed (8.2 mm in the example) to coincide with the first trough in the transmission loss curve of radio wave of synthet­ic resin material which is a forming material for the covering member 3g. However, the thickness may be such as will coincide with higher order (second, third) troughs.
  • the covering mem­ber 3g is mounted by means of a clamp ring 31.
  • a reference numeral 32 denotes a mounting member formed inte­grally with the block part 15g, which consists of a cylindrical part 33 and a collar part 34.
  • the clamp ring 31 clamps to fix the collar part 34 to the col­lar 10g.
  • the clamp ring 31 is formed of a con­ductive material such as copper, aluminum, brass or the like, and operates a primary radiator 1g as a singlet corrugated horn.
  • the covering member 3g shaped as described above is easy to fabricate as compared with that of having the aforementioned spherical radio wave receiving domain, thus moderating the manufacturing cost.
  • an electrical thickness to the radio wave incoming slantingly to an axis of a horn part 5g is large as compared with an electrical thickness of the radio wave incoming along the axis. Then, larger the angle of inclination of an incoming radio wave to the aforementioned axis, the greater the electri­cal thickness. Accordingly, it is preferable that the covering member 3g having such block part 15g as mentioned above be used on a parabolic antenna with an illumination angle of the reflector viewed from a horn part 5g relatively small (90° or below, for example).
  • Fig. 8 indicates transmission loss char­acteristics of radio wave of polyphenylene oxide used as a forming material for the covering member 3g, giving a thickness of the material on the quad­rature axis and a transmission loss of SHF radio wave on the axis of ordinates. Then, in the character­istics, a thickness of the block part 15g in the covering member 3g is specified to the thickness coincident with a first trough I of transmission loss curves H1 to H3 of SHF radio wave (H1 indicat­ing transmission loss curve at 10.95 GHz, H2 at 11.3 GHz, H3 at 11.7 GHz).
  • the thickness is selected properly in the range where the aforementioned transmission loss be­comes a value not to exert a big influence on the reception of SHF radio wave, that is, in the range where the transmission loss becomes a permissible value (0.3 dB, for example) or below.
  • the thickness whereat the transmission loss is minimized is a size obtainable through multiply­ing a half wavelength of SHF radio wave by the veloc­ity factor of synthetic resin which is a forming material of the covering member.
  • the aforementioned half wavelength of radio wave refers to a half of the average taken between a wavelength in free space and a wavelength in a waveguide part 4g.
  • a block part 15h is provided with a cylindri­cal part 35 on a rear side of the peripheral edge portion.
  • a presence of the cylindrical part 35 gives rise to a space 36 between an aperture end 7h of a horn part 5h and a plane 15a opposite to the aperture end 7h in the block part 15h.
  • a thickness t2 of the cylindrical part 35 and a width W of the space 36 are sizes obtainable through multiplying a quarter of the free space wavelength of SHF radio wave to handle by the velocity factor of a forming material for covering member 3h.
  • the covering member 3h is provided with a clamp ring 37 formed integrally therewith.
  • a transmission loss of radio wave which may arise due to a presence of the block part 15h is kept less as in the case where the block part is not present, and VSWR is improved as in the case where the block part is not present.
  • Fig. 10 and Fig. 11 represent examples wherein covering members 3i, 3j are constituted of block parts 15i, 15j only respectively.
  • the covering members 3i, 3j have each outside diameter formed slightly larger than inside diameters of waveguide parts 4i, 4j.
  • the covering members 3i, 3j are fitted into the waveguide parts 4i, 4j.
  • a circumferential overhang 38 comes in contact with the inside of a horn part 5j to place the cover­ing member 3j in position automatically in the ex­ample of Fig. 11. Accordingly, it can be fitted easily as deep as a predetermined position.
  • the covering members 3i, 3j shown in Fig. 10 and Fig. 11 are simplified in shape, they can be manufactured with ease. Further the manufacturing cost is moderated. They can be incorporated in the bodies 2i, 2j simply, too.
  • the covering members 3i, 3j may be bonded watertightly on inner peripheries of the waveguide parts 4i, 4j at each full circum­ference with an adhesive.
  • FIG. 12 there is shown a primary ra­diator provided with a radio wave introducing mem­ber variant in form.
  • a radio wave introducing mem­ber 40 is fabricated integrally with a case 8ak of a frequency converter 8k. Then, the radio wave introducing member 40 has only a horn part 5k for receiving radio waves, and a receiving member 9k is coupled to the horn part 5k.

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  • Details Of Aerials (AREA)
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EP88103388A 1987-12-02 1988-03-04 Primärstrahler für Parabolantenne Withdrawn EP0322498A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP304753/87 1987-12-02
JP30475387 1987-12-02

Publications (2)

Publication Number Publication Date
EP0322498A2 true EP0322498A2 (de) 1989-07-05
EP0322498A3 EP0322498A3 (de) 1990-05-23

Family

ID=17936810

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88103388A Withdrawn EP0322498A3 (de) 1987-12-02 1988-03-04 Primärstrahler für Parabolantenne

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EP (1) EP0322498A3 (de)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4116095A1 (de) * 1991-05-17 1992-11-19 Uwe Heynen Allwetterschutz fuer den polarisierer einer parabolantenne
EP0523802A1 (de) * 1991-07-19 1993-01-20 Philips Patentverwaltung GmbH Feedhorn
DE4215554A1 (de) * 1992-05-12 1993-11-18 Ant Nachrichtentech Abdeckhaube für Antennenstrahler
WO1994001899A1 (en) * 1992-07-02 1994-01-20 W. L. Gore & Associates, Inc. Sealing frame and protective membrane for a radar dish or horn
FR2782846A1 (fr) * 1998-08-28 2000-03-03 Thomson Csf Radome monobloc
DE19838406C1 (de) * 1998-08-24 2000-04-06 Siemens Ag Radom für ein freies Ende eines hochfrequente Funksignale aussendenden und/oder empfangenden Hohlleiters
US7064727B2 (en) 2001-12-26 2006-06-20 Sharp Kabushiki Kaisha Feed horn structure and manufacturing method thereof, converter, and satellite communication receiving antenna

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3114123A (en) * 1960-08-03 1963-12-10 Emi Ltd Wave guide window having edge sealed in bottom of choke
DE2060923A1 (de) * 1969-12-10 1971-07-29 Comp Generale Electricite Dielektrische Linse fuer die Aussendung von elektromagnetischen Strahlen
DE2222952A1 (de) * 1972-02-21 1973-11-22 Siemens Ag Druckdichte, wetterfeste, dielektrische abdichtscheibe fuer einen hohlleiterstrahler
JPS52113142A (en) * 1976-03-18 1977-09-22 New Japan Radio Co Ltd Water proof system for microwave antenna

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3114123A (en) * 1960-08-03 1963-12-10 Emi Ltd Wave guide window having edge sealed in bottom of choke
DE2060923A1 (de) * 1969-12-10 1971-07-29 Comp Generale Electricite Dielektrische Linse fuer die Aussendung von elektromagnetischen Strahlen
DE2222952A1 (de) * 1972-02-21 1973-11-22 Siemens Ag Druckdichte, wetterfeste, dielektrische abdichtscheibe fuer einen hohlleiterstrahler
JPS52113142A (en) * 1976-03-18 1977-09-22 New Japan Radio Co Ltd Water proof system for microwave antenna

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
A.W. RUDGE et al.: "THE HANDBOCK OF ANTENNA DESIGN" vol. 2, 1983, Peter Peregrinus London, GB *
ELECTRONICS LETTERS vol. 17, no. 21, October 1981, pages 777-779, London, GB; W.S. DAVIES et al.: "Bird-Proff Feed-Horn Windows for Microwave Radio System Antennas" *
PATENT ABSTRACTS OF JAPAN vol. 1, no. 165 (E-77)(9383), 26 December 1977; & JP-A-52 113 142 (SHIN NIPPON SEITETSU K.K.) 22.09.1977 *

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4116095A1 (de) * 1991-05-17 1992-11-19 Uwe Heynen Allwetterschutz fuer den polarisierer einer parabolantenne
EP0523802A1 (de) * 1991-07-19 1993-01-20 Philips Patentverwaltung GmbH Feedhorn
DE4215554A1 (de) * 1992-05-12 1993-11-18 Ant Nachrichtentech Abdeckhaube für Antennenstrahler
WO1994001899A1 (en) * 1992-07-02 1994-01-20 W. L. Gore & Associates, Inc. Sealing frame and protective membrane for a radar dish or horn
DE19838406C1 (de) * 1998-08-24 2000-04-06 Siemens Ag Radom für ein freies Ende eines hochfrequente Funksignale aussendenden und/oder empfangenden Hohlleiters
FR2782846A1 (fr) * 1998-08-28 2000-03-03 Thomson Csf Radome monobloc
US7064727B2 (en) 2001-12-26 2006-06-20 Sharp Kabushiki Kaisha Feed horn structure and manufacturing method thereof, converter, and satellite communication receiving antenna
US7154446B2 (en) 2001-12-26 2006-12-26 Sharp Kabushiki Kaisha Feed horn structure and manufacturing method thereof, converter, and satellite communication receiving antenna

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