EP0285879A1 - Filtre de polarisation à large bande - Google Patents

Filtre de polarisation à large bande Download PDF

Info

Publication number
EP0285879A1
EP0285879A1 EP88104292A EP88104292A EP0285879A1 EP 0285879 A1 EP0285879 A1 EP 0285879A1 EP 88104292 A EP88104292 A EP 88104292A EP 88104292 A EP88104292 A EP 88104292A EP 0285879 A1 EP0285879 A1 EP 0285879A1
Authority
EP
European Patent Office
Prior art keywords
waveguide
inner conductor
switch according
polarizing switch
rectangular waveguide
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.)
Granted
Application number
EP88104292A
Other languages
German (de)
English (en)
Other versions
EP0285879B1 (fr
Inventor
Eberhard Dr.-Ing. Schuegraf
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.)
Siemens AG
Siemens Corp
Original Assignee
Siemens AG
Siemens 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 Siemens AG, Siemens Corp filed Critical Siemens AG
Priority to AT88104292T priority Critical patent/ATE90813T1/de
Publication of EP0285879A1 publication Critical patent/EP0285879A1/fr
Application granted granted Critical
Publication of EP0285879B1 publication Critical patent/EP0285879B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P1/00—Auxiliary devices
    • H01P1/16—Auxiliary devices for mode selection, e.g. mode suppression or mode promotion; for mode conversion
    • H01P1/161—Auxiliary devices for mode selection, e.g. mode suppression or mode promotion; for mode conversion sustaining two independent orthogonal modes, e.g. orthomode transducer

Definitions

  • the invention relates to a broadband polarization switch for separating orthogonally linearly polarized electromagnetic microwaves with a branching device which divides a waveguide guiding the two orthogonal polarizations into two rectangular waveguide arms which each only carry one of these polarizations.
  • K / a the cross-sectional factor for the respective wave in the rectangular waveguide
  • Z o the field wave resistance of a plane wave in free space
  • ⁇ o the wavelength in free space
  • ⁇ k the respective critical wavelength, which is also called the cut-off wavelength of the wave type under consideration.
  • a broadband adjustment of the wave resistance jump between the lines is - in principle over large bandwidths of one octave and more - impossible.
  • the object of the invention is to provide a possibility with which the disturbing jumps in wave resistance in the case of broadband polarization switches to be used are reduced or completely eliminated.
  • this object is achieved in that measures are provided in the waveguide guiding the two polarizations, by means of which its originally about twice as large a characteristic impedance to the inherently equal characteristic impedances of the two Rectangular waveguide arms are approximated or adjusted in the best case, for which two conditions have to be met, namely on the one hand the approximation of the cross-sectional factors in the wave resistance equations of the waveguides to be matched and on the other hand the approximation of the cut-off frequencies of the wave types to be merged in these waveguides, and that remaining reactances in the Waveguides can be adapted by means of transformation measures requiring only short lengths.
  • the invention is based on the idea that the line wave resistances of the rectangular crossover waveguide arms with their aspect ratio a ⁇ 2 b are fixed, whereas the line wave resistance of the waveguide carrying the two orthogonal polarizations is not fixed and can therefore be freely selected.
  • This opens up the previously unused possibility of lowering the line wave resistance of the waveguide guiding the two orthogonal polarizations by the specified measures and thus at least approximating the line wave resistances of the rectangular waveguide arms.
  • Ideal adaptation conditions prevail if the line wave resistances of the waveguide carrying the two orthogonal polarizations are broadband matched to those of the rectangular waveguide arms.
  • the inner conductor 6 is easier to manufacture than the conductive webs 2, 3, 4 and 5 extending in the longitudinal direction of the waveguide.
  • the inner conductor 6 is in the arranged middle longitudinal axis of the outer conductor 1 and thus runs concentrically.
  • the inner conductor 1 is preferably fixed in the bifurcation zone of the three polarization switch waveguides with the outer conductor contours, i.e. conductive, connected. This specially created attachment can be used universally and can be used for reflection compensation of both polarizations.
  • the simplest form of an inner conductor 6 is the circular cross-sectional shape shown in the right-hand illustration of FIG. 1.
  • a significant expansion of the uniqueness range for the coaxial waveguide is also achieved, for which quantitative information will follow in the further course of the description.
  • the inner conductor 6 can be, for example, cruciform, and combinations with a round or square outer conductor 1 without or with conductive longitudinal webs 2, 3, 4 and 5 are also possible.
  • the inner conductor 6 causes very little additional losses and brings the following additional advantages.
  • the inner conductor 6, which is extended beyond the polarization switch, is suitable for improving the behavior of a consumer connected to the polarization switch, e.g. to improve the bandwidth of the low reflection of a grooved horn and its cross-polarization properties compared to horn feeding through a pure waveguide - i.e. without an inner conductor.
  • the inner conductor 6 can end in the horn neck, in the groove area or outside the horn aperture in a continuous, stepped or abrupt manner.
  • space can be created in a hollow inner conductor 6 for waves of the same or different type with the same or different frequency as those waves already present outside the inner conductor 6.
  • the interior of the inner conductor can in turn be suitably provided with conductive material or with a dielectric.
  • Coupling devices for waves can also be arranged in the interior of the inner conductor 6 and / or near its surface, which are coupled from the space outside the inner conductor to its interior and vice versa.
  • the inner conductor 6 predominantly increases the transverse capacitance in the wave resistance equivalent circuit diagram for H waves.
  • the wave resistance of the H11 wave or the H10 wave - as intended - and the associated cutoff wavelengths increase.
  • the coaxial waveguide with a circular inner and outer conductor 3 shows the quantitative relationship between the characteristic impedance of this coaxial waveguide and its diameter ratio d / D k from inner conductor diameter d to outer conductor diameter D k .
  • the measurements are carried out in such a way that, for coaxial waveguides with specific values of the diameter ratios (d / D K ) n , that rectangular waveguide with its aspect ratio (b / a) n is determined, which results in broadband adaptation at the abrupt transition between the respective coaxial waveguide and the rectangular waveguide.
  • the limit frequencies of the H10 wave in the rectangular waveguide and the H11 wave in the coaxial waveguide are made the same.
  • the diameter D o of the imaginary circular waveguide that determines the has the same H11 cutoff frequency as the coaxial waveguide.
  • the reactance remaining at the cross-sectional jump is broadband compensated by a suitable longitudinal offset of the beginning of the inner conductor relative to the jump point.
  • Such abrupt transitions from the rectangular waveguide to the coaxial waveguide require practically no overall length. They reach bandwidths of poor reflection up to an octave, and over 50% bandwidth their reflection is less than 1%.
  • An important basic component of wave resistance homogeneous polarization switches is thus available.
  • their theoretical uniqueness ranges are then determined in view of the E11 interference wave that occurs first with symmetrical H11 excitation.
  • the E11-following H31 interference wave according to Fig. 6 is also included in the observation.
  • the H31 interference wave is excited despite symmetrical excitation next to the H11 fundamental wave, because according to Fig. 6 e.g. the E-field strengths of the H13 wave at diametrically opposite points on the circumference in the coaxial waveguide always have the same direction as the E-fields of the H11 wave.
  • the range of uniqueness f kH31 / f kH11 is also expanded.
  • a broadband polarization filter of a two-band antenna system for the directional radio frequency ranges 3.58 to 4.2 GHz and 6.425 to 7.125 GHz is explained below with reference to FIG. 7.
  • the inevitable expansion of the unambiguity range succeeds with the introduction of an inner conductor 8, so that according to FIG. 7, for example from the article by E.
  • the E11 interference field of the double branch 9 is sufficiently attenuated; and - since the inner conductor 8 is extended into the vicinity of the first groove of a connected grooved horn - the E11 useful excitation in the groove region is decoupled from the horn waveguide with the aperiodic E11 damping as desired.
  • the shape of the inner conductor 8 has a very decisive influence on the horn reflection and also on the cross-polarization suppression, even with very small changes.
  • the rotationally symmetrical transformer offers many, easily implemented correction options that always have the same effect for both polarizations.
  • the polarization switch shown in the exemplary embodiment according to FIG. 7 has a very large useful bandwidth. Therefore, it is particularly suitable for the fact that on its rectangular waveguide arms 10 and 11 a crossover for two or more directional radio frequency ranges of different frequency positions are connected (directly).
  • the connection between the two rectangular waveguide arms 10 and 11 of the polarization crossover shown in FIG. 7 and the two crossovers can also be established by two long lines, which are designed, for example, as having corresponding transitions, overmoded, bendable rectangular waveguides and by all conceivable measures are suitable to expand their clear transmission frequency range, more than one directional radio range of the same polarization from the location of the crossovers, e.g. at the foot of the antenna tower, low attenuation, reflection and delay distortion to the broadband polarization switch arranged directly on the antenna, i.e. for example on the tower and vice versa.
  • the inner conductor shown in Figure 7 of the already mentioned article by E. Schuegraf in the magazine “NTZ”, Volume 38 (1985), No. 8 is not a round inner conductor in the sense of the invention, with which a wave resistance homogenization is achieved along the two passages of a polarization switch, but around a ⁇ / 4 transformer.
  • the inner conductor shown in FIGS. 2a and 2b of DE-PS 28 42 576 also represents a narrow-band ⁇ / 4 transformer network with additional reactances, specifically for good adaptation in two narrow frequency ranges that are relatively far apart (narrow octave ), specially tailored and cannot be compared with an inner conductor dimensioned according to the invention.
  • new polarization switches can now be dimensioned, each of which has two rectangular waveguide arms, for example, with the following aspect ratios (calculation table):
  • the coaxial waveguide is determined in each case which has the same H11 cutoff frequency and frequency-independent same waveguide resistances as the rectangular waveguide arms in the case of a round outer and inner conductor.
  • the respective d / D K value of the coaxial waveguide follows from Fig.

Landscapes

  • Waveguide Switches, Polarizers, And Phase Shifters (AREA)
  • Separation Using Semi-Permeable Membranes (AREA)
  • Filtration Of Liquid (AREA)
  • External Artificial Organs (AREA)
  • Networks Using Active Elements (AREA)
  • Control Of Motors That Do Not Use Commutators (AREA)
  • Waveguide Aerials (AREA)
EP88104292A 1987-03-24 1988-03-17 Filtre de polarisation à large bande Expired - Lifetime EP0285879B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT88104292T ATE90813T1 (de) 1987-03-24 1988-03-17 Breitband-polarisationsweiche.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3709558 1987-03-24
DE3709558 1987-03-24

Publications (2)

Publication Number Publication Date
EP0285879A1 true EP0285879A1 (fr) 1988-10-12
EP0285879B1 EP0285879B1 (fr) 1993-06-16

Family

ID=6323816

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88104292A Expired - Lifetime EP0285879B1 (fr) 1987-03-24 1988-03-17 Filtre de polarisation à large bande

Country Status (4)

Country Link
EP (1) EP0285879B1 (fr)
AT (1) ATE90813T1 (fr)
AU (1) AU614279B2 (fr)
DE (1) DE3881741D1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5109232A (en) * 1990-02-20 1992-04-28 Andrew Corporation Dual frequency antenna feed with apertured channel
EP0518218A1 (fr) * 1991-06-11 1992-12-16 Siemens Aktiengesellschaft Coupleur-polarisateur à micro-ondes
FR2907601A1 (fr) * 2006-10-24 2008-04-25 Satimo Sa Coupleur a bande de fonctionnement ultra large de jonction a mode orthogonal

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3871586D1 (de) * 1987-03-24 1992-07-09 Siemens Ag Breitbandige polarisationsweiche.

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3150333A (en) * 1960-02-01 1964-09-22 Airtron Division Of Litton Pre Coupling orthogonal polarizations in a common square waveguide with modes in individual waveguides
DE2521956A1 (de) * 1975-05-16 1976-11-18 Siemens Ag Polarisationsweiche
GB2175145A (en) * 1979-07-24 1986-11-19 Thomson Csf Wide-band polarization diplexer

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ATE58033T1 (de) * 1985-03-27 1990-11-15 Siemens Ag Polaristationsweiche fuer einrichtungen der hoechstfreqenztechnik.
DE3871586D1 (de) * 1987-03-24 1992-07-09 Siemens Ag Breitbandige polarisationsweiche.

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3150333A (en) * 1960-02-01 1964-09-22 Airtron Division Of Litton Pre Coupling orthogonal polarizations in a common square waveguide with modes in individual waveguides
DE2521956A1 (de) * 1975-05-16 1976-11-18 Siemens Ag Polarisationsweiche
GB2175145A (en) * 1979-07-24 1986-11-19 Thomson Csf Wide-band polarization diplexer

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES, Band MTT-33, Nr. 2, February 1985, Seiten 143-145, IEEE, New York, US; R. TERAKADO: "Exact wave resistance of coaxial regular polygonal conductors" *
NACHRICHTENTECHNISCHE ZEITSCHRIFT, N.T.Z., Band 38, Nr. 8, August 1985, Seiten 554-560, Berlin, DE; E. SCHUEGRAF: "Neuartige Mikrowellenweichen für Zweibandantennen" *

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5109232A (en) * 1990-02-20 1992-04-28 Andrew Corporation Dual frequency antenna feed with apertured channel
EP0518218A1 (fr) * 1991-06-11 1992-12-16 Siemens Aktiengesellschaft Coupleur-polarisateur à micro-ondes
FR2907601A1 (fr) * 2006-10-24 2008-04-25 Satimo Sa Coupleur a bande de fonctionnement ultra large de jonction a mode orthogonal
WO2008049776A1 (fr) 2006-10-24 2008-05-02 Ste D'applications Technologiques De L'imagerie Micro-Onde Coupleur à bande de fonctionnement ultra large de jonction à mode orthogonal
US8125295B2 (en) 2006-10-24 2012-02-28 Ste D'applications Technologiques De L'imagerie Micro-Onde Orthogonal-mode coupler of the coaxial type having a branched central conductor

Also Published As

Publication number Publication date
AU614279B2 (en) 1991-08-29
DE3881741D1 (de) 1993-07-22
EP0285879B1 (fr) 1993-06-16
ATE90813T1 (de) 1993-07-15
AU1339988A (en) 1988-09-22

Similar Documents

Publication Publication Date Title
DE69008116T2 (de) Ebene Antenne.
EP2830156B1 (fr) Émetteur de rayonnement à conducteur creux, émetteur de rayonnement de réseaux d'antennes et émetteur de rayonnement de radar à ouverture synthétique
DE3013903A1 (de) Antenne fuer zwei frequenzbaender
DE2443166A1 (de) Systemweiche zur trennung zweier signale, die aus je zwei doppelt polarisierten frequenzbaendern bestehen
DE2738326A1 (de) Mikrowellenanordnung zum umwandeln einer hohlleiterstruktur in eine mikrostreifenleiterstruktur
DE837404C (de) Verbindungsstueck zum Verbinden eines Erdsymmetrischen Stromkreises mit einem erdunsymmetrischen
DE3111106C2 (fr)
DE68917548T2 (de) Koaxialer Wellenleiterphasenschieber.
EP2100348A1 (fr) Émetteur de rayonnement à conducteur creux pour systèmes de radar à ouverture synthétique
DE2136759C2 (de) Antenne mit metallischem Rahmen und den Rahmen erregendem Unipol
EP0196065B1 (fr) Filtre de polarisation pour dispositifs HF
EP0154692A1 (fr) Filtre de polarisation pour deux bandes de fréquences
EP0285879B1 (fr) Filtre de polarisation à large bande
DE2703878A1 (de) Polarisationsweiche
DE2842576A1 (de) Polarisationsweiche
EP0284911B1 (fr) Filtre de polarisation à large bande
DE2521956C3 (de) Polarisationsweiche
DE2719283C2 (de) Antennenspeisesystem für Doppelpolarisation
DE2708271C2 (de) Polarisationsweiche
DE2541569C2 (de) Frequenzabhängiges Dämpfungsglied
EP4092914A1 (fr) Antennes couplées au rayonnement en réseau
DE2804132C2 (de) Wellentypenweiche
DE2747654B2 (fr)
DE68927515T2 (de) Hybrider RF-Phasenschieber
DE2431278C2 (de) Vierpol-Filter

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT BE CH DE ES FR GB GR IT LI LU NL SE

17P Request for examination filed

Effective date: 19890126

17Q First examination report despatched

Effective date: 19910703

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): AT BE CH DE ES FR GB GR IT LI LU NL SE

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 19930616

Ref country code: FR

Effective date: 19930616

Ref country code: ES

Free format text: THE PATENT HAS BEEN ANNULLED BY A DECISION OF A NATIONAL AUTHORITY

Effective date: 19930616

Ref country code: BE

Effective date: 19930616

REF Corresponds to:

Ref document number: 90813

Country of ref document: AT

Date of ref document: 19930715

Kind code of ref document: T

REF Corresponds to:

Ref document number: 3881741

Country of ref document: DE

Date of ref document: 19930722

ITF It: translation for a ep patent filed
GBT Gb: translation of ep patent filed (gb section 77(6)(a)/1977)

Effective date: 19930823

EN Fr: translation not filed
PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LU

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19940331

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
EAL Se: european patent in force in sweden

Ref document number: 88104292.3

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 19970224

Year of fee payment: 10

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: AT

Payment date: 19970305

Year of fee payment: 10

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: NL

Payment date: 19970320

Year of fee payment: 10

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: SE

Payment date: 19970321

Year of fee payment: 10

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: CH

Payment date: 19970620

Year of fee payment: 10

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19980317

Ref country code: AT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19980317

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19980318

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LI

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19980331

Ref country code: CH

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19980331

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: NL

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19981001

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 19980317

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

NLV4 Nl: lapsed or anulled due to non-payment of the annual fee

Effective date: 19981001

EUG Se: european patent has lapsed

Ref document number: 88104292.3

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 20010312

Year of fee payment: 14

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20021001

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES;WARNING: LAPSES OF ITALIAN PATENTS WITH EFFECTIVE DATE BEFORE 2007 MAY HAVE OCCURRED AT ANY TIME BEFORE 2007. THE CORRECT EFFECTIVE DATE MAY BE DIFFERENT FROM THE ONE RECORDED.

Effective date: 20050317