EP2311133A1 - Orthomode transducer for the reception of two orthogonally polarized waves - Google Patents

Orthomode transducer for the reception of two orthogonally polarized waves

Info

Publication number
EP2311133A1
EP2311133A1 EP08784164A EP08784164A EP2311133A1 EP 2311133 A1 EP2311133 A1 EP 2311133A1 EP 08784164 A EP08784164 A EP 08784164A EP 08784164 A EP08784164 A EP 08784164A EP 2311133 A1 EP2311133 A1 EP 2311133A1
Authority
EP
European Patent Office
Prior art keywords
orthomode transducer
wall
antennas
section
reflexive
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Withdrawn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
EP08784164A
Other languages
German (de)
French (fr)
Inventor
Shuji Saito
Milan Sevcik
Jaroslav Pernica
Jan Otruba
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.)
Alps Electric Czech sro
Original Assignee
Alps Electric Czech sro
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 Alps Electric Czech sro filed Critical Alps Electric Czech sro
Publication of EP2311133A1 publication Critical patent/EP2311133A1/en
Withdrawn legal-status Critical Current

Links

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 an orthomode transducer for the reception of two orthogonally polarized electromagnetic waves in which two mutually perpendicular antennas are arranged.
  • the body of low noise converter exceeds or may easily exceed the width of the feedhorn, which is unsuitable and unfavourable for the multifocus systems.
  • Fig. Ia shows the first embodiment of the orthomode transducer in a schematic oblique view
  • Fig. 2 shows a view from the direction of the received electromagnetic waves
  • Fig. Ic is a cross sectional view taken along cross section A-A of Fig. Ib
  • Fig. 2a shows the second embodiment of the orthomode transducer in a schematic oblique view
  • Fig. 2b shows a view from the direction of the received electromagnetic waves
  • Fig. 2c is a cross sectional view taken along cross section A-A of Fig. 2b
  • Fig. 3a is the third embodiment of the orthomode transducer in a schematic oblique view
  • Fig. Ia shows the first embodiment of the orthomode transducer in a schematic oblique view
  • Fig. 2 shows a view from the direction of the received electromagnetic waves
  • Fig. Ic is a cross sectional view taken along cross section A-A of Fig. Ib
  • Fig. 3a is the third embodiment of
  • FIG. 3b shows the view from the direction of the received electromagnetic waves
  • Fig. 3c is the cross sectional view taken along cross section A-A of Fig. 3b
  • Fig. 4a shows the fourth embodiment of the orthomode transducer in a schematic oblique view
  • Fig. 4b is a view from the direction of the received electromagnetic waves
  • Fig. 4c is a cross sectional view taken along cross section A-A of Fig. 4b
  • Fig. 5a shows the fifth embodiment of the orthomode transducer in a schematic oblique view
  • Fig. 5b is a view from the direction of the received electromagnetic waves
  • Fig. 5c is a cross sectional view taken along cross section A-A of Fig. 5b
  • FIG. 6a is the sixth embodiment of the orthomode transducer in a schematic oblique view
  • Fig. 6b is a view from the direction of the received electromagnetic waves
  • Fig. 6c is a cross sectional view taken along cross section A-A of Fig. 6b
  • Fig. 7 shows an embodiment of the orthomode transducer in a schematic oblique view complete with the indication of the printed circuit board
  • Fig. 8a is an embodiment with a double sided shoulder in a schematic oblique view
  • Fig. 8b is a view from the direction of the received electromagnetic waves
  • Fig. 8c is a cross sectional view taken along cross section A-A of Fig. 8b
  • Fig. 9 shows the dependence of the electric properties of the orthomode transducer according to the present invention on the frequency for both the vertical and the horizontal electromagnetic waves.
  • An object of the present invention is to provide an orthomode transducer (OMT) ⁇ that eliminates to the minimum the shortcomings of the known solutions and that can be implemented by the application of pressure die casting technology.
  • OMT orthomode transducer
  • the subject matter of the present invention consists in the fact that in the body of the orthomode transducer a shoulder is formed narrowing the cross section of the body, which forms the reflexive wall for the first of the antennas in the direction of propagation of the electromagnetic waves, the reflexive wall being linked with a plane wall essentially parallel to the body axis.
  • the first of the antennas in the direction of propagation of the electromagnetic waves has its longitudinal axis parallel to the reflexive wall.
  • the body of the orthomode transducer ends in a closing wall constituting a reflexive wall for the second antenna in the direction of propagation of the electromagnetic waves.
  • OMT orthomode transducer
  • the transitional edges of the steps are bevelled or rounded off. It is advantageous for the simplicity of the embodiment, if one of the antennas is constituted by a microstrip antenna embedded directly in the printed circuit board of the low noise converter and the other antenna is constituted by a conductive wire connected direct to the printed circuit board of the low noise converter.
  • the major part of the body is of quadrangular or circular cross section.
  • one of the antennas is located in the portion of the orthomode transducer body of constant cross section, approximately at a distance equal to a fourth part of the wave length of the entering electromagnetic waves from the reflexive wall and the other antenna is located approximately at a distance equal to a fourth part of the wave length of the entering electromagnetic waves from the closing wall of the body.
  • One of the antennas is constituted by a microstrip antenna embedded directly in the printed circuit board of the low noise converter.
  • the other antenna is constituted by an electrically conductive wire connected direct to the printed circuit board of the low noise converter proper.
  • the main advantages of the disclosed solution given to the orthomode transducer consist in the fact that there is no need to use an additional reflector or a phase shifter.
  • the whole orthomode transducer together with the waveguide, feedhorn and low noise converter frame can be manufactured by applying the pressure die casting technology.
  • the space solution of the orthomode transducer according to the present invention completed with a suitable location of the receiving antennas is advantageous for the design of the low noise converter and thus it facilitates its electrical design. Examples of preferred embodiments
  • the first embodiment of the orthomode transducer according to the present invention illustrates its fundamental principle.
  • the body 1 of the waveguide and orthomode transducer is constituted by a metal square thin- walled profile, whose whole cross section is open at one of its sides.
  • the cross section of its body need not be exactly square, it may be of rectangular or circular form.
  • the input part of body 1 is therefore a waveguide, while in the end part of body I the orthomode transducer proper is created.
  • the body profile 1 is narrowed by reflexive wall 4 orthogonal to the axis of body L Reflexive wall 4 thus forms the shoulder of body 1_ at one of its sides. It links up with the peripheral wall parallel to the opposite peripheral wall, which is plane in its whole length.
  • a vertical antenna 3 is located for the reception of vertically polarized waves.
  • Vertical antenna 3 forms a component part of the printed circuit board, on which the electronic circuit proper of low noise converter (LNC) is located.
  • Wall 4 carries out the function of the reflector for said vertical wall 3.
  • a horizontal antenna 2 for the reception of horizontally polarized waves is located.
  • Closing wall 5 (Fig. Ib) represents the reflector for said horizontal antenna 2.
  • Reflexive wall 4 influences the impedance accommodation between the waveguide and the horizontal antenna 2.
  • Horizontal antenna 2 is made of electrically conductive wire made of commonly used materials, as nickel, copper, brass etc., and it is connected to a printed circuit board (not shown) of the low noise converter proper. No fixing material is used here between horizontal antenna 2 and body 1, i.e. around horizontal antenna 2, nevertheless, materials in common use as polyethylene or polytetrafluorethylene may be used here.
  • the orthomode transducer according to the present invention functions as follows:
  • the polarized electromagnetic waves from the feedhorn enter body 1, as shown by the arrow and the symbol ⁇ in Fig. Ia.
  • the horizontally and vertically polarized wave passes through the waveguide until it reaches a portion of the orthomode transducer (OMT).
  • OMT orthomode transducer
  • the vertically polarized wave is received by the vertical antenna 3
  • the horizontally polarized wave is received by the horizontal antenna 2.
  • the second variant presents an improvement by the fact that one successive step has been added to the orthomode transducer, namely the second wall 6. Said second wall 6 improves the impedance accommodation between the orthomode transducer and horizontal antenna 2.
  • FIGs. 3a- 3c Another possible improvement is presented by the third variant (Figs. 3a- 3c).
  • bevels have been added by bevelling away edges 7, 8, 9 and JJ) connecting any of the direct portions of body 1 of the orthomode transducer with the reflexive wall 4 or with the second wall 6.
  • This embodiment also improves the impedance accommodation between the orthomode transducer and horizontal antenna 2. From the aspect of the orthomode transducer production, the bevelling of edges 7, 8, 9 and j_0 also facilitates the flow of material in the course of the pressure die forming and thus prolongs the service life of the mould - this results in a better quality and stability of the moulded product.
  • the fourth variant (Figs. 4-4c) is the modification of the third variant. Instead of bevelling edges 7, 8, 9 and 10, they are rounded off and the edges are designated with the same reference marks.
  • the embodiment of the orthomode transducer is the same as the embodiment according to the fourth variant.
  • the only difference consists in the fact that horizontal antenna 2 is cranked.
  • This variant may be advantageous in relation to the size of the printed circuit board, the electronic circuit and its design and arrangement on the printed circuit board.
  • the body has a circular cross section, which is also advantageous from the aspect of its operation.
  • the design of the section of orthomode transducer starting from the reflexive wall 4 is essential and it corresponds to the third variant.
  • Both walls 4, 6 and bevels 7, 8, 9, JJ) and the design of both antennas 2 and 3 are essentially the same as in the third variant.
  • the design corresponds to the design shown in example 1 , but body 1 is shouldered on both sides. According to this embodiment, both opposite walls of body 1 (Fig. 8) are shouldered. The position of both antennas 2 and 3 is the same as in example 1.
  • the double sided shoulders of body j_ can be made analogically in all the remaining examples 2 to 7.
  • At least one shoulder is made narrowing the cross section of body 1, which forms reflexive wall 4 for the first of antennas 2, 3 in the direction of propagation of the electromagnetic waves, the reflexive wall 4 being linked up with the plane wall of body L, which is essentially parallel to the axis of body L
  • the first of said two antennas 2, 3 in the direction of propagation of the electromagnetic waves has its longitudinal axis parallel to said reflexive wall 4 - according to the exemplified embodiment the first of the antennas is said vertical antenna 3 for the reception of vertically polarized electromagnetic waves.
  • Body 1 ends in closing wall 5 which constitutes a reflexive wall for the second antenna in the direction of propagation of the electromagnetic waves.
  • Said shoulder formed in said body J_ perhaps the first shoulder, carries out the function of reflexive wall 4 and links up with a plane wall parallel to the axis of said body L
  • two single sided step-shaped shoulders are formed in a portion of the orthomode transducer.
  • the number of such shoulders may be even greater. They are either single sided, i.e. they narrow the orthomode transducer from one side only, preferably to approximately one half of the maximum cross section of body J_, the opposite wall being essentially identical in its whole length.
  • the pressure die casting technology is applied in the production of the orthomode transducer, slow gradual narrowing of the waveguide cross section and consequently of the orthomode transducer is preferred for production reasons. Nevertheless, it does not essentially affect the above-mentioned design of the waveguide and the orthomode transducer.
  • the radius of cylindrical body j_ is then gradually slightly reduced.
  • At least one double sided shoulder narrowing the cross section of the body from two opposite sides.
  • the function of the reflexive wall 4 is then carried out by the two opposite shoulders and, if need be - if there is more than one shoulder at each side - the first two shoulders. It is evident that such shoulders should not protrude up to the middle of the cross section of the body J_, as it could happen in case of a one-sided shoulder, nevertheless, for example two opposite shoulders may reduce at a single bound the cross section of the body I to a half- dimension of the cross section is to be chosen in dependence on the transmitted frequence band.
  • vertical antenna 3 and horizontal antenna 2 form an angle of 90°. It is specified in the description of the examples and shown in the respective figures that in view of propagation of the received signal, vertical antenna 3_ is located before horizontal antenna 2. Nevertheless, the position of said antennas 2 and 3_ may be mutually interchanged, while the operation of the orthomode transducer remains identical.
  • one of antennas 2, 1 is essentially located in a portion of body 1 of a constant cross section approximately at a distance equal to a fourth part of the wavelength ⁇ of the polarized waves entering from reflexive wall 4 and the second of the antennas 2, 3 is positioned approximately at a distance equal to a fourth part of the wavelength of the polarized waves entering from the closing wall 5 of body 1.
  • Fig. 9 shows the characteristics of an orthomode transducer achieved according to the embodiment described in example 3, where a bent antenna is used according to example 5.
  • the enclosed charts indicate evident merits of the orthomode transducer according to the present invention meeting the conditions of a quality reception for both plane-polarized electromagnetic waves.
  • the invention is designed, nevertheless not solely, for the application in a low noise converter feedhorn (LNCF) or a low noise block feedhorn (LNBF) for the reception of signal transmitted by communication satellites. Nevertheless, it may be generally used also for the reception of other two plane-polarized electromagnetic waves.
  • LNCF low noise converter feedhorn
  • LNBF low noise block feedhorn

Landscapes

  • Waveguide Aerials (AREA)

Abstract

The orthomode transducer for the reception of orthogonally polarized waves in which two (2, 3) antennas orthogonal to each other are arranged. I n the body (1) of the orthomode transducer a shoulder is formed narrowing the cross section of body (1), which forms reflexive wall (4) for the first of the antennas (2, 3) in the direction of propagation of electromagnetic waves, the reflexive wall (4) being linked up with plane wall of body (1) essentially parallel to the axis of body (1).

Description

ORTHOMODE TRANSDUCER FOR THE RECEPTION OF TWO ORTHOGONALLY POLARIZED WAVES
Field of the invention
The invention relates to an orthomode transducer for the reception of two orthogonally polarized electromagnetic waves in which two mutually perpendicular antennas are arranged.
Description of the Prior Art
Well known solutions of the orthomode transducer for the reception of the satellite transmission are described for example in the patents EP 0853348 Bl, EP -1465282 Al and GB 2303496.
According to the above solutions, the body of low noise converter exceeds or may easily exceed the width of the feedhorn, which is unsuitable and unfavourable for the multifocus systems.
The embodiment according to said patents requires the application of additional elements. In the solution disclosed in EP 0853348 Bl and EP 1465282 it is an additional reflector. In the solution disclosed in EP 1465282 it is also a phase shifter. In entails necessity of a disadvantageous and exacting assembly of the low noise converter feedhorn and thus it results in an increase of its price. It is also disadvantageous that it is not possible to produce the phase shifter and the reflector by the application of pressure die casting technology. To ensure the best characteristics possible, it is necessary to ensure the best contact possible of the reflector and the phase shifter with the waveguide. It entails higher demands laid on the accuracy of manufacture and thus also the rise in price of the product. In the solution disclosed in GB 2303496, a too large surface of the printed circuit board is thus occupied, which results in larger dimensions of the low noise converter feedhorn and thus in an additional price increase.
Brief description of the drawings
The invention is described on the basis of the enclosed drawings, where Fig. Ia shows the first embodiment of the orthomode transducer in a schematic oblique view, Fig. 2 shows a view from the direction of the received electromagnetic waves, Fig. Ic is a cross sectional view taken along cross section A-A of Fig. Ib, Fig. 2a shows the second embodiment of the orthomode transducer in a schematic oblique view, Fig. 2b shows a view from the direction of the received electromagnetic waves, Fig. 2c is a cross sectional view taken along cross section A-A of Fig. 2b, Fig. 3a is the third embodiment of the orthomode transducer in a schematic oblique view, Fig. 3b shows the view from the direction of the received electromagnetic waves, Fig. 3c is the cross sectional view taken along cross section A-A of Fig. 3b, Fig. 4a shows the fourth embodiment of the orthomode transducer in a schematic oblique view, Fig. 4b is a view from the direction of the received electromagnetic waves, Fig. 4c is a cross sectional view taken along cross section A-A of Fig. 4b, Fig. 5a shows the fifth embodiment of the orthomode transducer in a schematic oblique view, Fig. 5b is a view from the direction of the received electromagnetic waves, Fig. 5c is a cross sectional view taken along cross section A-A of Fig. 5b, Fig. 6a is the sixth embodiment of the orthomode transducer in a schematic oblique view, Fig. 6b is a view from the direction of the received electromagnetic waves, Fig. 6c is a cross sectional view taken along cross section A-A of Fig. 6b, Fig. 7 shows an embodiment of the orthomode transducer in a schematic oblique view complete with the indication of the printed circuit board, Fig. 8a is an embodiment with a double sided shoulder in a schematic oblique view, Fig. 8b is a view from the direction of the received electromagnetic waves, Fig. 8c is a cross sectional view taken along cross section A-A of Fig. 8b and Fig. 9 shows the dependence of the electric properties of the orthomode transducer according to the present invention on the frequency for both the vertical and the horizontal electromagnetic waves.
Substance of the invention
An object of the present invention is to provide an orthomode transducer (OMT) < that eliminates to the minimum the shortcomings of the known solutions and that can be implemented by the application of pressure die casting technology.
The subject matter of the present invention consists in the fact that in the body of the orthomode transducer a shoulder is formed narrowing the cross section of the body, which forms the reflexive wall for the first of the antennas in the direction of propagation of the electromagnetic waves, the reflexive wall being linked with a plane wall essentially parallel to the body axis.
It is also important that the first of the antennas in the direction of propagation of the electromagnetic waves has its longitudinal axis parallel to the reflexive wall. The body of the orthomode transducer ends in a closing wall constituting a reflexive wall for the second antenna in the direction of propagation of the electromagnetic waves.
It is also advantageous for the function of the orthomode transducer (OMT), if at least two single sided shoulders forming stair steps are provided.
Better characteristics of the orthomode transducer may be achieved in an embodiment, where the transitional edges of the steps are bevelled or rounded off. It is advantageous for the simplicity of the embodiment, if one of the antennas is constituted by a microstrip antenna embedded directly in the printed circuit board of the low noise converter and the other antenna is constituted by a conductive wire connected direct to the printed circuit board of the low noise converter.
The major part of the body is of quadrangular or circular cross section.
From the view of the application, it is important that one of the antennas is located in the portion of the orthomode transducer body of constant cross section, approximately at a distance equal to a fourth part of the wave length of the entering electromagnetic waves from the reflexive wall and the other antenna is located approximately at a distance equal to a fourth part of the wave length of the entering electromagnetic waves from the closing wall of the body. One of the antennas is constituted by a microstrip antenna embedded directly in the printed circuit board of the low noise converter. The other antenna is constituted by an electrically conductive wire connected direct to the printed circuit board of the low noise converter proper.
The main advantages of the disclosed solution given to the orthomode transducer consist in the fact that there is no need to use an additional reflector or a phase shifter. The whole orthomode transducer together with the waveguide, feedhorn and low noise converter frame can be manufactured by applying the pressure die casting technology. The space solution of the orthomode transducer according to the present invention completed with a suitable location of the receiving antennas is advantageous for the design of the low noise converter and thus it facilitates its electrical design. Examples of preferred embodiments
Example 1
The first embodiment of the orthomode transducer according to the present invention (Figs. Ia - Ic) illustrates its fundamental principle. The body 1 of the waveguide and orthomode transducer is constituted by a metal square thin- walled profile, whose whole cross section is open at one of its sides. The cross section of its body need not be exactly square, it may be of rectangular or circular form.
The electromagnetic waves enter body 1 from the input side from a known feedhorn (not shown). The input part of body 1 is therefore a waveguide, while in the end part of body I the orthomode transducer proper is created. In the region of the orthomode transducer, the body profile 1 is narrowed by reflexive wall 4 orthogonal to the axis of body L Reflexive wall 4 thus forms the shoulder of body 1_ at one of its sides. It links up with the peripheral wall parallel to the opposite peripheral wall, which is plane in its whole length.
Approximately at a distance corresponding to a fourth part of the wave length λ of the incoming electromagnetic waves from reflexive wall 4 towards the input part of body L1 a vertical antenna 3 is located for the reception of vertically polarized waves. Vertical antenna 3 forms a component part of the printed circuit board, on which the electronic circuit proper of low noise converter (LNC) is located. Wall 4 carries out the function of the reflector for said vertical wall 3.
In the narrowed portion of the orthomode transducer (OMT), at a distance corresponding approximately to a fourth part of the wave length of the incoming electromagnetic waves from the closing wall 5_ of body 1_, a horizontal antenna 2 for the reception of horizontally polarized waves is located. Closing wall 5 (Fig. Ib) represents the reflector for said horizontal antenna 2. Reflexive wall 4 influences the impedance accommodation between the waveguide and the horizontal antenna 2. Horizontal antenna 2 is made of electrically conductive wire made of commonly used materials, as nickel, copper, brass etc., and it is connected to a printed circuit board (not shown) of the low noise converter proper. No fixing material is used here between horizontal antenna 2 and body 1, i.e. around horizontal antenna 2, nevertheless, materials in common use as polyethylene or polytetrafluorethylene may be used here.
The orthomode transducer according to the present invention functions as follows:
The polarized electromagnetic waves from the feedhorn (not shown) enter body 1, as shown by the arrow and the symbol λ in Fig. Ia. The horizontally and vertically polarized wave passes through the waveguide until it reaches a portion of the orthomode transducer (OMT). Here, the vertically polarized wave is received by the vertical antenna 3, while the horizontally polarized wave is received by the horizontal antenna 2.
The location of vertical antenna 3_ in the orthomode transducer enables direct connection of both the vertical antenna 3 and horizontal antenna 2 to the same printed circuit board. As far as the location of both antennas is concerned, it should be noted that although their ideal position is in the middle of the cross section of the orthomode transducer, to ensure good operation of the orthomode transducer (OMT), it is not indispensable to adhere completely to this position. The variability in the positioning of both antennas in the orthomode transducer may lead to an even more convenient special arrangement.
The signals from both antennas 2, 3 are further processed as usual. Example 2
The second variant (Figs. 2a-2c) presents an improvement by the fact that one successive step has been added to the orthomode transducer, namely the second wall 6. Said second wall 6 improves the impedance accommodation between the orthomode transducer and horizontal antenna 2.
Example 3
Another possible improvement is presented by the third variant (Figs. 3a- 3c). In this embodiment, bevels have been added by bevelling away edges 7, 8, 9 and JJ) connecting any of the direct portions of body 1 of the orthomode transducer with the reflexive wall 4 or with the second wall 6. This embodiment also improves the impedance accommodation between the orthomode transducer and horizontal antenna 2. From the aspect of the orthomode transducer production, the bevelling of edges 7, 8, 9 and j_0 also facilitates the flow of material in the course of the pressure die forming and thus prolongs the service life of the mould - this results in a better quality and stability of the moulded product.
Example 4
The fourth variant (Figs. 4-4c) is the modification of the third variant. Instead of bevelling edges 7, 8, 9 and 10, they are rounded off and the edges are designated with the same reference marks.
Example 5
According to the fifth variant (Figs. 5a-5c), the embodiment of the orthomode transducer is the same as the embodiment according to the fourth variant. The only difference consists in the fact that horizontal antenna 2 is cranked. This variant may be advantageous in relation to the size of the printed circuit board, the electronic circuit and its design and arrangement on the printed circuit board.
Example 6
According to the sixth variant (Figs. 6a-6c), the body has a circular cross section, which is also advantageous from the aspect of its operation. The design of the section of orthomode transducer starting from the reflexive wall 4 is essential and it corresponds to the third variant. Both walls 4, 6 and bevels 7, 8, 9, JJ) and the design of both antennas 2 and 3 are essentially the same as in the third variant.
Example 7
It is the variant (Fig. 7) described in example 3, where a part of the printed circuit board JJ_ is shown for the sake of completeness.
Example 8
The design corresponds to the design shown in example 1 , but body 1 is shouldered on both sides. According to this embodiment, both opposite walls of body 1 (Fig. 8) are shouldered. The position of both antennas 2 and 3 is the same as in example 1.
The double sided shoulders of body j_ can be made analogically in all the remaining examples 2 to 7.
Summary
It follows from the foregoing examples that in a portion of the orthomode transducer, at least one shoulder is made narrowing the cross section of body 1, which forms reflexive wall 4 for the first of antennas 2, 3 in the direction of propagation of the electromagnetic waves, the reflexive wall 4 being linked up with the plane wall of body L, which is essentially parallel to the axis of body L
The first of said two antennas 2, 3 in the direction of propagation of the electromagnetic waves has its longitudinal axis parallel to said reflexive wall 4 - according to the exemplified embodiment the first of the antennas is said vertical antenna 3 for the reception of vertically polarized electromagnetic waves. Body 1 ends in closing wall 5 which constitutes a reflexive wall for the second antenna in the direction of propagation of the electromagnetic waves.
Said shoulder formed in said body J_, perhaps the first shoulder, carries out the function of reflexive wall 4 and links up with a plane wall parallel to the axis of said body L According to examples 2 to 7, two single sided step-shaped shoulders are formed in a portion of the orthomode transducer. The number of such shoulders may be even greater. They are either single sided, i.e. they narrow the orthomode transducer from one side only, preferably to approximately one half of the maximum cross section of body J_, the opposite wall being essentially identical in its whole length. When the pressure die casting technology is applied in the production of the orthomode transducer, slow gradual narrowing of the waveguide cross section and consequently of the orthomode transducer is preferred for production reasons. Nevertheless, it does not essentially affect the above-mentioned design of the waveguide and the orthomode transducer. In example 6, the radius of cylindrical body j_ is then gradually slightly reduced.
It is also possible to form at least one double sided shoulder narrowing the cross section of the body from two opposite sides. The function of the reflexive wall 4 is then carried out by the two opposite shoulders and, if need be - if there is more than one shoulder at each side - the first two shoulders. It is evident that such shoulders should not protrude up to the middle of the cross section of the body J_, as it could happen in case of a one-sided shoulder, nevertheless, for example two opposite shoulders may reduce at a single bound the cross section of the body I to a half- dimension of the cross section is to be chosen in dependence on the transmitted frequence band.
It holds for all the exemplified embodiments that vertical antenna 3 and horizontal antenna 2 form an angle of 90°. It is specified in the description of the examples and shown in the respective figures that in view of propagation of the received signal, vertical antenna 3_ is located before horizontal antenna 2. Nevertheless, the position of said antennas 2 and 3_ may be mutually interchanged, while the operation of the orthomode transducer remains identical. Therefore, it holds that one of antennas 2, 1 is essentially located in a portion of body 1 of a constant cross section approximately at a distance equal to a fourth part of the wavelength λ of the polarized waves entering from reflexive wall 4 and the second of the antennas 2, 3 is positioned approximately at a distance equal to a fourth part of the wavelength of the polarized waves entering from the closing wall 5 of body 1.
Fig. 9 shows the characteristics of an orthomode transducer achieved according to the embodiment described in example 3, where a bent antenna is used according to example 5. The enclosed charts indicate evident merits of the orthomode transducer according to the present invention meeting the conditions of a quality reception for both plane-polarized electromagnetic waves.
Industrial applicability
The invention is designed, nevertheless not solely, for the application in a low noise converter feedhorn (LNCF) or a low noise block feedhorn (LNBF) for the reception of signal transmitted by communication satellites. Nevertheless, it may be generally used also for the reception of other two plane-polarized electromagnetic waves.

Claims

C L A I M S The orthomode transducer for the reception of orthogonally polarized waves in which two (2, 3) antennas orthogonal to each other are arranged characterized in that in its body (1) a shoulder is formed narrowing the cross section of body (1), which forms reflexive wall (4) for the first of the antennas (2, 3) in the direction of propagation of electromagnetic waves, the reflexive wall (4) being linked up with plane wall of body (1) essentially parallel to the axis of body (1). The orthomode transducer of claim 1 characterized in that the first of the antennas (2, 3) in the direction of propagation of electromagnetic waves has its longitudinal axis parallel to the reflexive wall (4). The orthomode transducer of claim 1 or 2 characterized in that the body
(1) ends in a closing wall (5), which constitutes a reflexive wall for the second antenna in the direction of propagation of electromagnetic waves.
The orthomode transducer of claim 1 characterized in that at least two step-shaped shoulders are formed.
The orthomode transducer of claim 4 characterized in that the edges of the step-shaped shoulders are bevelled.
The orthomode transducer of claim 4 characterized in that the edges of the step-shaped shoulders are rounded. The orthomode transducer of any of the foregoing claims characterized in that one of the antennas (2, 3) is formed by a microstrip antenna formed direct in the printed circuit board of a low noise converter and the second of the antennas (2, 3) is formed by an electrically conductive wire connected direct to the printed circuit board of a low noise converter.
The orthomode transducer of any of the foregoing claims characterized in that the prevailing portion of body (1) has a square cross section.
The orthomode transducer of any of the foregoing claims characterized in that the prevailing portion of body (1) has a circular cross section.
. The orthomode transducer of claim 4 characterized in that one of the antennas (2, 3) is positioned in a portion of the body (1) of a constant cross section approximately at a distance equal to a fourth part of the wavelength of the polarized waves entering from the reflexive wall (4) and the second of the antennas (2, 3) is positioned approximately at a distance equal to a fourth part of the wavelength of the polarized waves entering from closing the wall (5) of the body (1).
EP08784164A 2008-07-22 2008-07-22 Orthomode transducer for the reception of two orthogonally polarized waves Withdrawn EP2311133A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/CZ2008/000086 WO2010009682A1 (en) 2008-07-22 2008-07-22 Orthomode transducer for the reception of two orthogonally polarized waves

Publications (1)

Publication Number Publication Date
EP2311133A1 true EP2311133A1 (en) 2011-04-20

Family

ID=40243797

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08784164A Withdrawn EP2311133A1 (en) 2008-07-22 2008-07-22 Orthomode transducer for the reception of two orthogonally polarized waves

Country Status (2)

Country Link
EP (1) EP2311133A1 (en)
WO (1) WO2010009682A1 (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5800689B2 (en) * 2011-11-17 2015-10-28 三菱電機株式会社 Polarization splitter
GB201806856D0 (en) * 2018-04-26 2018-06-13 Pro Brand International Europe Ltd Improvements to satellite receiving and transmitting apparatus
RU2691673C1 (en) * 2018-06-29 2019-06-17 Публичное акционерное общество "Радиофизика" Waveguide polarization selector
EP4052330B1 (en) 2019-10-29 2025-09-10 European Space Agency Waveguide component for use in an orthomode junction or an orthomode transducer
US12040522B2 (en) * 2021-10-19 2024-07-16 Rohde & Schwarz Gmbh & Co. Kg Over-the-air measurement system

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04134901A (en) 1990-09-26 1992-05-08 Toshiba Corp Input device for receiving both horizontally and vertically polarized waves
JPH06204701A (en) * 1992-11-10 1994-07-22 Sony Corp Polarizer and waveguide-microstrip line converter
TW344152B (en) 1995-07-19 1998-11-01 Alps Electric Co Ltd Outdoor converter for receiving satellite broadcast
US20020153962A1 (en) 1996-09-09 2002-10-24 Baird Andrew Patrick Waveguide for use in dual polarisation probe system
JP3210889B2 (en) 1997-01-14 2001-09-25 シャープ株式会社 Orthogonal dual polarization waveguide input device and satellite broadcast receiving converter using the same
JP3662446B2 (en) 1999-07-30 2005-06-22 シャープ株式会社 Dual frequency feed
JP4027244B2 (en) 2002-08-05 2007-12-26 アルプス電気株式会社 Converter for satellite broadcasting reception
JP2004297532A (en) 2003-03-27 2004-10-21 Alps Electric Co Ltd Primary radiator

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2010009682A1 *

Also Published As

Publication number Publication date
WO2010009682A1 (en) 2010-01-28

Similar Documents

Publication Publication Date Title
JP4822262B2 (en) Circular waveguide antenna and circular waveguide array antenna
US6304219B1 (en) Resonant antenna
EP1354370B1 (en) Radio frequency antenna feed structures
KR101059047B1 (en) Metamaterial Omni-directional Circularly Polarized Antenna
US20210288391A1 (en) Waveguide microstrip line converter
US20020097109A1 (en) Waveguide to microstrip transition
US10218076B1 (en) Hexagonal waveguide based circularly polarized horn antennas
CN113300089A (en) Low-frequency oscillator, antenna array and antenna device
CA1211208A (en) Electromagnetic wave radiator and use thereof in an electronic sweep antenna
US11303004B2 (en) Microstrip-to-waveguide transition including a substrate integrated waveguide with a 90 degree bend section
CN101315997A (en) Phase shifter
EP2311133A1 (en) Orthomode transducer for the reception of two orthogonally polarized waves
JP5597065B2 (en) Waveguide / planar line converter and high frequency circuit
JP4712841B2 (en) Waveguide / stripline converter and high-frequency circuit
JP6219324B2 (en) Planar transmission line waveguide converter
CZ285794B6 (en) Flat antenna
Wei et al. Design methodology of single-/dual-band polarization rotator with coupled slotlines
CN112259969B (en) A Metasurface-Based Millimeter-Wave Broadband Circularly Polarized Feed Antenna
CN115458892A (en) Four-way in-phase unequal power divider based on circular SIW resonant cavity
KR100222668B1 (en) Combination polarizer for linear and circular polarized wave
KR100358970B1 (en) Mode Converter
RU2730381C1 (en) Single 90-degree angle bending in n-plane in rectangular waveguide structure
RU2812810C2 (en) Method for exciting slot antenna with multi-loop conductor and device for its implementation
CN114204277B (en) A broadband coaxial metal-dielectric composite ridge waveguide polarizer
CZ22163U1 (en) Polarization switch for reception of two orthogonally polarized waves

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

17P Request for examination filed

Effective date: 20110216

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MT NL NO PL PT RO SE SI SK TR

AX Request for extension of the european patent

Extension state: AL BA MK RS

RAP1 Party data changed (applicant data changed or rights of an application transferred)

Owner name: ALPS ELECTRIC CZECH S.R.O

DAX Request for extension of the european patent (deleted)
STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 20120201