CN204966650U - Ka broadband orthogonal mode coupler - Google Patents

Abstract

The utility model discloses a ka broadband orthogonal mode coupler design has realized ka frequency channel antenna microwave signal orthogonal polarization's separation. It includes that the cross divides the wave head, the cross respectively connect an equal phase waveguide bend on dividing four waveguides export of wave head, wherein be in two equal phase waveguide bends that connect in two waveguides exports in the same rectilinear direction and become symmetric relations, every waveguide export T type that all assembles to two equal phase waveguide bends becoming the symmetric relation is synthetic overhead, has all connect a twisted waveguide on public mouthful of the synthetic head of every T type. This orthogonal mode coupler has ultra wide band, high isolation, equal phase, the standing wave is little, the loss is little, the power capacity is big excellent features, can satisfy especially circular polarized antenna's microwave network design demand of nearly all ka satellite communication duplexer, and compact structure is pleasing to the eye, the handling ease, has very high using value in the middle of engineering application.

Description

Ka broadband orthomode coupler

Technical field

The utility model relates to a kind of Ka broadband orthomode coupler design in satellite communication field, can meet the microwave network design requirement that all Ka frequency ranges defend logical dual-mode antenna, is particularly useful for the microwave network design of circular polarization dual reflector antenna.

Background technology

Since new century, the communication technology of satellite maked rapid progress, requires microwave technology constantly progress thereupon, broadband and the miniaturized theme becoming microwave passive component design.And new thought, new theory and new technology ensure that the design of many high accuracy components and parts completes.Orthomode coupler, be called for short OMT, be the core component in microwave network, its major function is the separation realizing orthogonally polarized signal.Directly be connected with feed during its application, therefore its bandwidth of operation determines the utilized bandwidth of antenna.Visible, the design of orthomode coupler quality is for most important antenna.

The development of orthomode coupler has had the history of 50 or six ten years, but until the nineties in last century, along with the development of broadband antenna technology, the design of broadband orthomode coupler has just had the progress of matter.Orthomode coupler kind is a lot, and different type application is in different places.At this, main orthomode coupler classification is enumerated as follows, and its general pluses and minuses are done simple analysis and summary.

1, traditional sidewall coupled quadrature device.Service band is narrower, and structure is asymmetric, but isolation is higher, handling ease;

2, fin line structure wideband orthogonal device.Such orthogonal device band designs is wider, and applying frequency is higher, handling ease, but interport isolation is not high, and cross-polarization performance is poor;

3, four ridge structure wideband orthogonal devices.Band designs is very wide, but is mainly used in lower frequency;

4, structure wideband orthogonal device.Design frequency is very wide, compact conformation, but the delivery outlet phase such as not, complex structure, it is more difficult to process;

5, the orthogonal device of two ridge structure.With orthogonal device is similar;

6, the orthogonal device of symmetrical negative feedback structure.Frequency of utilization is wider, waits and exports mutually.But complex structure, it is more difficult to process;

7, the orthogonal device of traditional turnsile structure.Design frequency is very wide, without probe and diaphragm, need not debug, but processed complex, cost is higher.

Utility model content

The purpose of this utility model is to provide a kind of device-Ka orthomode coupler that can be separated orthogonal polarization pattern, the plurality of advantages such as the utility model has the phases such as ultra broadband, high-isolation, output, insertion loss is little, standing-wave ratio is little, power capacity is large, handling ease.This orthogonal device can meet the design requirement of Ka communication Whole frequency band microwave network, is particularly useful for the design of circular polarization network.

The purpose of this utility model is achieved in that

Ka broadband orthomode coupler, it comprises, cross divides wave head 1, described cross divides on four of wave head 1 waveguide outlet and respectively connects first-class phase waveguide bend curved 2, wherein be in same rectilinear direction two waveguide outlet on phase waveguide bend 2 one-tenth symmetric relations such as connect two, often pair becomes the waveguide outlet of the phase waveguide bends 2 such as two of symmetric relation all to converge in a T-shaped synthesis 3, and the common port of each T-shaped synthesis 3 is connected to a waveguide twist.

Further, described cross divides wave head 1 by being stacked the circular waveguide 11 fixing through positioning welding up and down and impedance matching block 12 forms, be provided with square match block step in the central authorities of impedance matching block 12, the symmetry axis of square match block step of described impedance matching block 12 and the axis of the waveguide cavity of circular waveguide 11 coincide.

Further, bottom circular waveguide 11 with four branch roads all intersect, and have corner cut at each crossover location place.

Further, the step number of plies of the square match block step in described impedance matching block 12 is 5 layers.

Further, a pair one-tenth described symmetric relation etc. phase waveguide bend 2 symmetry axis with another to become symmetric relation etc. the symmetry axis of phase waveguide bend 2 perpendicular.

Further, T-shaped synthesis wherein 3 is connected to 45 ° along waveguide twists 4, another T-shaped synthesis 3 is connected to 45 ° of inverse waveguide twists 5,45 ° parallel with the broadsides of the waveguide mouth of 45 ° of inverse waveguide twists 5 along waveguide twists 4.

Further, described waveguide twist is formed by the impedance matching block welding that 3 have high accuracy seam.The utility model tool compared with background technology has the following advantages:

1, the utility model inherits cross partial wave head broadband character, square column matching layer is changed into by traditional cross being divided cylinder coupling in wave head, and branch road crossover location adds the further expansion that corner cut achieves bandwidth in circular waveguide, orthogonal device bandwidth meets Ka communication frequency full bandwidth and covers, and relative bandwidth reaches 54%.

2, the utility model adopts the phase waveguide bend composition polarity combination networks such as 4, and ensure that the symmetry of orthomode coupler two signal output channels electrical structure and physical structure, its simple waveguiding structure greatly simplify the difficulty of processing of orthogonal device.

3, in the utility model, the direction of an electric field of pairwise orthogonal polarized wave is changed to same direction by 2 kinds of 45 ° of waveguide twists by delivery outlet, is beneficial to the microwave network synthesis of rear end;

4, cross divides the round and smooth process of chamfering of matching layer in match block and T-shaped synthesizer in wave head 1, and the pure wave guide structure design of waveguide comprise network, improves the power bearing ability of orthogonal device.

5, electrical specifications is excellent, has high-isolation, ultra broadband characteristic, low standing wave, the characteristic of low insertion loss;

6, the utility model principle is simple, structure is attractive in appearance, it is easy to design, be easy to processing, for the design of Ka communication antenna particularly circular polarized antenna microwave network provides safeguard.

Accompanying drawing explanation

Fig. 1 is structural representation of the present utility model;

Fig. 2 is the structural representation that in the utility model, cross divides wave head;

Fig. 3 is bottom view and the internal cross section diagram of circular waveguide in the utility model;

Fig. 4 is top view and the cross section cut-away view of the utility model middle impedance match block;

Fig. 5 is the structural representation of waveguide comprise network in the utility model;

Fig. 6 is the structural representation of Y type synthesizer in the utility model;

Fig. 7 is 45 ° of structural representations along waveguide twist in the utility model;

Fig. 8 is the structural representation of 45 ° of inverse waveguide twists in the utility model;

Fig. 9 is the cross-sectional view of 45 ° of inverse waveguide twists in the utility model;

Description of reference numerals: cross divide wave head-1, etc. phase waveguide bend-2, T-shaped synthesis head-3,45 ° along waveguide twist-4,45 ° of inverse waveguide twist-5, circular waveguide-11, impedance matching block-12, the first coupling flange-51, match block-52, the second coupling flange-53.

As shown in Figure 1, the utility model divides waveguide comprise network 2,2 T-shaped synthesis of the phase waveguide bend compositions such as wave head 1, four joint 3,45 ° of suitable waveguide twists 4 and 45 ° of inverse waveguide twists 5 to form primarily of broadband cross, the spiral shell that each parts add sealing ring by negative and positive flange connects the air-tightness design that mode ensures broadband orthomode coupler.Rectangular waveguide design flanged outlet is BJ220 standard exit, performs GB GB11449.2-89.Broadband orthomode coupler design size is 95mm × 65mm × 50mm.

As Fig. 1, shown in 2, described cross divides wave head 1 to comprise the sagging circular waveguide 11 that stacks and square impedance matching block 12, circular waveguide 11 and impedance matching block 12 fix through positioning welding, wherein impedance matching block 12 central authorities are provided with square match block step, the symmetry axis of square match block step of described impedance matching block 12 and the axis of the waveguide cavity of circular waveguide 11 coincide, cover for meeting Ka frequency full bandwidth, square coupling step design is 5 layers, and bottom circular waveguide 11 with four branch roads all intersect, and have corner cut at each crossover location place.。

As shown in Figure 1,5, divide on wave head 1 four waveguide outlet at cross and respectively connect first-class phase waveguide bend 2, wherein be in phase waveguide bend 2 one-tenth symmetric relations such as two that two waveguide outlet in same rectilinear direction connect, a pair one-tenth symmetric relation etc. phase waveguide bend 2 symmetry axis with another to become symmetric relation etc. the symmetry axis of phase waveguide bend 2 perpendicular, ensure the structural symmetry of broadband orthomode coupler.

From electric, be main mould TE11 mould in circular waveguide 11 by the signal of beacon reception, divide the pattern encouraged in wave head 1 to be transferred in waveguide comprise network 2 by the branch road that 4, bottom is mutually orthogonal at cross, be converted to the TE10 mould in rectangular waveguide, and due to the design of the phase waveguide bends such as 4, ensure that vertical (or level) polarized signal electromagnetic wave of two-way is combined to again synthesizing Shi Wei etc., do not have polarization energy to lose.

In order to ensure that circular waveguide 11 and waveguide comprise network 2 only transmit main mould TE11 mould and TE10 mould in required bandwidth in theory, circular waveguide radius need meet 0.293 λ max < r < 0.61 λ min, rectangular waveguide broadside need meet 0.5 λ max < a < λ min, and narrow limit need meet 0 < b < 0.5 λ min.

As shown in Fig. 1,6,7,8, often pair becomes the waveguide outlet of the phase waveguide bends 2 such as two of symmetric relation all to converge in a T-shaped synthesis 3, and like-polarized two branch path signals can newly synthesize a road signal by T-shaped synthesis is nose heave.And two the 45 ° waveguide twist rectangular waveguide Way outs that T-shaped synthesis connects for 3 times are consistent, when facing broadband orthomode coupler along circular waveguide 11 waveguide mouth normal direction, if two waveguide twists are in the below of circular waveguide and waveguide outlet broadside is just placed along horizontal line direction, then the waveguide twist of circular waveguide lower left is 45 ° of inverse waveguide twists, and the bottom-right waveguide twist of circular waveguide is 45 ° of suitable waveguide twists.The combination of T-shaped synthesis head and 2 kinds of waveguide twists completes two tasks jointly, one is that the grading structure on multiple stage rank meets the impedance transformation of 2 road TE10 mould signals to 1 road TE10 mould signal, two is when making antenna transmit-receive sharing, and the orthogonally polarized signal direction of an electric field of two-way synthesis is in same direction.

As shown in Figure 9, described 45 ° identical with the procedure of processing of 45 ° of inverse waveguide twists 5 along waveguide twist 4, similar, for 45 ° of inverse waveguide twists 5, consider from processing technology, be divided into the first coupling flange 51, match block 52 and the second coupling flange 53 3 part by 45 ° against waveguide twists 5, wherein the first coupling flange 51 and the second coupling flange 53 are made with precision welding seam, guarantee the precision of the rear each size of waveguide twist of three parts welding and angle.

Its concise and to the point operation principle is as follows:

When receiving vertical-horizontal polarized wave TE11 mould by orthogonal device circular waveguide 11 by feed, first wave head 1 is divided to be 2 parts by horizontal or vertical polarized wave energy in part through cross, enter corresponding perpendicular polarization or horizontal branches and waveguide comprise network 2, electromagnetic field becomes the TE10 mould in rectangular waveguide, then again uniting two into one of 2 portion of energy is realized in T-shaped synthesis 3 position for correspondence, the consistent of vertically polarized wave and horizontal polarized wave POLARIZATION CHANNEL Way out is realized, so that the synthesis of circular polarization microwave network along the inverse waveguide twist of waveguide twists 4 or 45 ° finally by 45 °.

Claims (7)

1.Ka broadband orthomode coupler, it is characterized in that: comprise cross and divide wave head (1), described cross divides on four waveguide outlet of wave head (1) and respectively connects first-class phase waveguide bend curved (2), wherein be in same rectilinear direction the phase waveguide bend (2) such as two waveguide outlet, two of connecing become symmetric relation, often pair becomes the waveguide outlet of the phase waveguide bends (2) such as two of symmetric relation all to converge on a T-shaped synthesis head (3), the common port of each T-shaped synthesis head (3) is connected to a waveguide twist.

2. Ka broadband orthomode coupler according to claim 1, it is characterized in that: described cross divides wave head (1) to form through the circular waveguide (11) of positioning welding and impedance matching block (12) by being stacked up and down, be provided with square match block step in the central authorities of impedance matching block (12), the axis of the symmetry axis of the square match block step of described impedance matching block (12) and the waveguide cavity of circular waveguide (11) coincides.

3. Ka broadband orthomode coupler according to claim 2, is characterized in that: circular waveguide (11) bottom with four branch roads all intersect, and have corner cut at each crossover location place.

4. Ka broadband orthomode coupler according to claim 2, is characterized in that: the step number of plies of the square match block step in described impedance matching block (12) is 5 layers.

5. Ka broadband orthomode coupler according to claim 1, is characterized in that: a pair one-tenth described symmetric relation etc. phase waveguide bend (2) symmetry axis with another to become symmetric relation etc. the symmetry axis of phase waveguide bend (2) perpendicular.

6. Ka broadband orthomode coupler according to claim 1, it is characterized in that: a T-shaped synthesis head (3) is connected to 45 ° wherein along waveguide twist (4), another T-shaped synthesis head (3) is connected to 45 ° of inverse waveguide twists (5), and 45 ° parallel with the broadside of the waveguide mouth of 45 ° of inverse waveguide twists (5) along waveguide twist (4).

7. Ka broadband orthomode coupler according to claim 1, is characterized in that: described waveguide twist is formed by the impedance matching block welding that 3 have high accuracy seam.