DE2161894B2

DE2161894B2 - Antenna system

Info

Publication number: DE2161894B2
Application number: DE19712161894
Authority: DE
Inventors: Kurt 7140 Ludwigsburg Maciejewski
Original assignee: Licentia Patent Verwaltungs GmbH
Current assignee: Bosch Telecom GmbH
Priority date: 1971-12-14
Filing date: 1971-12-14
Publication date: 1980-10-30
Also published as: GB1355279A; DE2161894C3; DE2161894A1

Description

Anhand eines Ausführungsbeispieles soll die Erfindung näher erläutert werden. In der Figur ist ein Querschnitt durch eine gemäß der Erfindung aufgebauteThe invention is to be explained in more detail using an exemplary embodiment. In the figure is a Cross section through a constructed according to the invention

The invention relates to an antenna system, consisting of an illumination antenna shown which is used for illumination

aus einem Parabolspiegel mit einer Ausleuchtantenne, 25 eines nicht gezeigten Parabolspiegels Anwendungfrom a parabolic mirror with an illuminating antenna, 25 of a parabolic mirror, not shown, application

die aus einem Speisehohlleiter gebildet wird, der an findetwhich is formed from a feed waveguide that takes place at

seiner Aperturöffnung einen konischen Hybrid-Mode- Die Ausbuchtung erfolgt durch einen Hohlleiter H, its aperture opening a conical hybrid mode- The bulge is made by a waveguide H,

Exciter with which the parabolic mirror facing which with its end aperture A on the not The cone side has concentrically attached slots, the parabolic mirror shown is aligned at the end

deren Tiefe gleich ist und ungefähr λ/4 beträgt und 30 des erwähnten Speisehohlleiters H ist ein sogenannterwhose depth is the same and is approximately λ / 4 and 30 of the aforementioned feed waveguide H is a so-called

deren Breite zwischen λ/10 und λ/20 liegt, wobei Hybrid-Mode-Erreger fangeordnet, der rückwirkungs-whose width is between λ / 10 and λ / 20, whereby hybrid-mode exciters are arranged, the retroactive

mindestens vier Schlitze vorhanden sind. frei an den Speisehohlleiter H angepaßt ist und imthere are at least four slots. is freely adapted to the feed waveguide H and in

By the US-PS 32 74 603 is already an antenna essential from a ring on the neck of the

system bekannt, welches dem eingangs beschriebenen Hohlleiters H aufgesetzten Metallteil besteht Diessystem known, which consists of the initially described waveguide H attached metal part

entspricht Der in dieser Patentschrift beschriebene 35 verläuft in Richtung zum auszuleuchtenden Parabolspie-The 35 described in this patent specification runs in the direction of the parabolic mirror to be illuminated

Parabolic mirror has an opening angle of at most gel conical. This cone is marked with K in the figure

100°. Er besitzt eine Ausleuchtantenne in Form eines bezeichnet. Die auf der Oberfläche dieses Konus100 °. He has an antenna in the form of a designated. The ones on the surface of this cone

konisch gebildeten Teils, der in Abstrahlrichtung zum angebrachten Schlitze S sind im rechten Teil der Figurconical part, the one in the direction of emission to the attached slots S are in the right part of the figure

Parabolic mirror with an opening angle of at most shown in a partial section.

130° aufweist. Es hat sich gezeigt, daß derartige 40 beispiel sind vier Schlitze S vorhanden mit einem130 °. It has been shown that such 40, for example, four slots S are present with one

Antenna systems in the E and // plane have a very mutual distance a, which is between A / 8 and λ / 4,

unterschiedliche Charakteristiken aufweisen und somit wenn mil λ die Wellenlänge bezeichnet wird. Diehave different characteristics and thus when mil λ denotes the wavelength. the

für bestimmte Anwendungszwecke nicht einsetzbar bezüglich ihrer Breite b gleich ausgebildeten SchlitzeCannot be used for certain applications with regard to their width b slots which are of the same design

sind. sind beim Ausführungsbeispiel unter sich alle in gleicherare. are all in the same way in the exemplary embodiment

DE-AS 12 45 447 also provides a directional 45 direction. With Z, the main radiation direction is

tenne mit Ringfokus-Paraboloidreflektor bekannt, bei tung der Ausleuchtantenne zum nicht gezeigtenantenna with ring focus parabolic reflector known, in the direction of the illuminating antenna not shown

dem der Speisehohlleiter von der Parabolrückseite Parabolspiegel bezeichnet. Die Breite b der Schlitze S which the feed waveguide from the parabolic rear side denotes parabolic mirrors. The width b of the slots S

eingeführt ist und mit einem geschlitzten Kegel in liegt zwischen λ/10 und λ/20. Der Konus desis introduced and with a slotted cone in is between λ / 10 and λ / 20. The cone of the

There is a connection whose opening angle is less than 180 °. Hybrid-mode exciter has an opening angle «of

ist und dessen auf seiner Oberfläche angebrachten 50 ungefähr 230°. Die mit t bezeichnete Tiefe der einzelnenand its 50 applied to its surface is about 230 °. The depth of each, denoted by t

Point the slots in the direction of radiation of the parabolic. Slots S is constant for all slots and amounts to This cone is now in turn of another approximately λ / 4. The optimal number of slots has been found to be

davor befindlichen Hilfsreaktor in Form eines innen mit ergeben, daß man mindestens vier dercrt ausgebildeterUpstream auxiliary reactor in the form of an inside with result that you have at least four of these trained

Hollow cone provided with slots with larger opening slots, which run in the shape of a ring in the conical surface,

nungswinkel in Abstrahlrichtung abgedeckt 55 vorsehen muß.angle covered in radiation direction 55 must provide.

In US-PS 32 12 096 an antenna system is already in order to avoid excessive shadowing of the to illuminate

stem beschrieben worden, bei welchem versucht wird, den Parabolspiegels zu erhalten, wurde der Durchmes-system has been described in which an attempt is made to maintain the parabolic mirror, the diameter was

die Richtcharakteristik in der//- und Ε-Ebene möglichst ser D des konusförmigen Hybrid-Mode-Erregers E the directional characteristic in the // and Ε planes as much as possible D of the conical hybrid-mode exciter E.

gleich zu machen. Dieses Antennensysem besteht aus ungefähr 3 λ gewählt Mit AH ist in der Figur eineto do the same. This antenna system consists of approximately 3 λ selected with AH in the figure

einem Parabolspiegel, der durch einen speziellen 60 dielektrische Abdeckhaube bezeichnet, die als Wetter-a parabolic mirror, which is characterized by a special 60 dielectric cover, which is used as a weather

Horn antenna is illuminated. In the aperture level protection for aperture A of the feed waveguide // is used

des Hornstrahlers ist eine Platte mit einer zentralen Eine gemäß der Erfindung aufgebaute Antennenan-of the horn antenna is a plate with a central antenna assembly constructed according to the invention

Recess for the horn opening made. On the order resulted in an opening angle of the conical

dem Parabolspiegel zugewandten Oberfläche der Platte migen Teils von ungefähr 230° eine 10 dB-Keulenbreitethe surface of the plate facing the parabolic mirror migen part of about 230 ° a 10 dB lobe width

befinden sich mehrere Schlitzreihen, die im Viereck 65 von 130° mit einer Änderung von weniger ±8% überthere are several rows of slots in the square 65 of 130 ° with a change of less ± 8% over

oder im Kreis um die Aperturöffnung verlaufen. Die ein Frequenzband von ±18%. Dabei liegt der ersteor run in a circle around the aperture opening. The a frequency band of ± 18%. Here lies the first

Schlitze sind ungefähr λ/4 tief. Der Abstand zwischen Nebenzipfel bei ca. 35 dB.
c«ui;.,„„ ,.,;„ „..„u a*~o~ □-<,:·.. l,i.hm <>·..,« mn Slots are approximately λ / 4 deep. The distance between side lobes at approx. 35 dB.
c «ui;.,"",.,;"".." u a * ~ o ~ □ - <,: · .. l, i.hm <> · .., « mn

UWIllllCVll ITIW UUWII UVI Vll l·»! WIlW WVlIUgI WlTTM #Vf IViUWIllllCVll ITIW UUWII UVI Vll l · »! WIlW WVlIUgI WlTTM #Vf IVi

1 sheet of drawings

Claims

ι 2

The directional characteristics match

Claim: with this design of the antenna system only in

a relatively narrow area.

Antenna system consisting of a parabolic The present invention therefore has the task

mirror with an illuminating antenna, which is made up of a 5 to form the antenna mentioned at the beginning so

Feeding waveguide is formed, which at his that you can with her both in the H and in the

Aperture opening a conical hybrid-mode Er- f plane receives the same characteristics as possible

lively with the parabolic mirror facing the invention this is achieved in that the

Conical side concentrically attached slots parabolic mirror an opening angle between 120 °

has, the depth of which is equal and approximately λ / 4 is io and 180 °, and that the slotted cone in

and the width of which is between A / 10 and A / 20, with the direction of emission towards the parabolic mirror being an open

at least four slots are present, thereby having angle of approximately 230 °, and that the

characterized in that the parabolic mirror spacing two successive slits between

has an opening angle between 120 ° and 180 °, is A / 4 and A / 8

and that the slotted cone (K) in the radiation direction 15 Contrary to the usual way of opening the

towards the parabolic mirror, an opening angle of less than 180 ° has to be selected for the illumination tan antenna

angle («) of approximately 230 °, and that the surprisingly

Distance (a) between two successive slots is shown that in the case of the one selected here

The opening angle is between Λ / 4 and A / 8, the requirements are met

20 could be.