CN108011159A - A kind of rectangular waveguide TE10Mould-circular waveguide TE01Mode converter - Google Patents

Abstract

The invention discloses a kind of rectangular waveguide TE10 moulds circular waveguide TE01 mode converters, belong to microwave, millimeter wave transmission apparatus technical field.Including rectangular waveguide power division network, quadrupole waveguide TE01 mode transition structures, quadrupole waveguide circular waveguide transition structure.The TE of standard rectangular waveguide input₁₀Mould is divided into the TE of four constant amplitudes by rectangular waveguide power division network₁₀Mould；Then quadrupole waveguide TE is injected at the same time₀₁In mode transition structure, corresponding TE has been encouraged₀₁Pattern；Finally, quadrupole waveguide TE₀₁TE in mode transition structure₀₁Mould fades to circular waveguide TE by quadrupole waveguide circular waveguide transition structure₀₁Mould, realizes rectangular waveguide TE₁₀Pattern is to circular waveguide TE₀₁The conversion of pattern.The present invention can effectively suppress the generation of spurious mode so that whole mode converter has the characteristics that high efficiency, high-purity, wide band.In addition, the waveguide mode conversion device of the present invention is compact-sized, simply, easy to process and assembling, has good engineering practicability.

Description

A kind of rectangular waveguide TE10Mould-circular waveguide TE01Mode converter

Technical field

The invention belongs to microwave, millimeter wave transmission apparatus technical field, and in particular to a kind of rectangular waveguide TE₁₀Mould-circle ripple Lead TE₀₁Mode converter.

Background technology

Gyrotron traveling wave tube be it is a kind of there is high power, broadband, the microwave and millimeter wave amplifier of high-gain, wait from Daughter heating, millimetre-wave radar, electronic countermeasure etc. have very big application value, in the world attention.Circular waveguide TE₀₁ Pattern has the characteristics that wall loss is minimum and field is symmetrical, is the common operating mode of gyrotron traveling wave tube.In grinding for gyrotron traveling wave tube In system and its application process, it is necessary to high frequency assembly, export structure, changeover portion and corresponding mode converter, waveguide bend etc. Low-power test is carried out, to examine the performance of these components (device).The pumping signal of signal source output is TEM coaxial mould or square Shape waveguide TE₁₀Mould, it is necessary to be converted into circular waveguide TE using mode converter₀₁Mould, could simulate the output of gyrotron traveling wave tube.Cause This, develops high efficiency, the rectangular waveguide TE of high-purity₁₀Mould-circular waveguide TE₀₁Mode converter is the development high-power milli of high-performance The important step of metric wave traveling wave duct member and its transmission apparatus.

In addition, in millimeter wave frequency band, can correspondingly reduce with the rising device size of frequency.If using traditional rectangular Waveguide TE₁₀Pattern carries out electromagnetic wave signal transmission, and waveguide ohmic loss is larger, it is difficult to realizes that high-effect long distance transmits.And justify ripple Lead TE₀₁Pattern has the characteristics that ohmic loss is less, can ensure the efficiency that electromagnetic wave signal transmits at a distance.Therefore, by square Shape waveguide TE₁₀Pattern is efficiently converted into high-purity circular waveguide TE₀₁Mould has for reducing transmission loss, improving efficiency of transmission Significance.

Currently, rectangular waveguide TE₁₀Mould-circular waveguide TE₀₁Mode converter can be coupled with through type, the side of side wall excitation Formula is realized.Through type coupling such as marie mode converters, first by the TE in rectangular waveguide₁₀Mould is converted into TE₂₀Mould, recycles Cruciform shape structure produces TE in cross waveguide₂₂Pattern, finally by the mode of waveguide gradual change by TE₂₂Mould is transitioned into round ripple Lead TE₀₁Mould.The mode purity that this mapping mode produces is high but complicated, and transition length is longer, to requirement on machining accuracy Height, generally requires by way of plating to realize, cost is high.The mode of side wall excitation is laterally through symmetrically or non-symmetrically Energisation mode realizes TE₀₁The generation of mould, it is compact-sized.Zewei Wu etc. are using mating structures such as diaphragm, matching chambers, by rectangle TE in waveguide₁₀Mould is coupled in rectangular waveguide by side is converted to TE₂₀Mould, recycles waveguide continuous gradation structure, by rectangle Waveguide TE₂₀Mould is progressively converted to the TE in circular waveguide₀₁Mould [Zewei Wu, Hao Li, Hua Fu, et.al, " ATE₀₁-mode generator for testing high power transmission devices”,Review of Scientific Instruments 84,114702(2013)].This pattern conversion regime can be real in the range of 29.3GHz-31.8GHz Existing efficiency of transmission is more than 90%, and the TE exported₀₁Mould purity is higher than 98%.Obviously, the working band of this mode converter is difficult To meet the application demand of wide frequency band device.The TE that C.F.Yu et al. inputs rectangular waveguide first with Y types power division network₁₀Mould etc. It is divided into four road TE₁₀Mould signal, then by four road TE of generation₁₀Mould signal is injected into round ripple at the same time by way of sidewall coupling Lead, so as to encourage the TE in circular waveguide₀₁Mould [C.F.Yu and T.H.Chang, " High Performance Circular TE₀₁,Mode Converter,"IEEE Transaction on Microwave Theory and Techniques, vol.53,no.12,Dec.2005].The result shows that：In Ka frequency bands, this designing scheme TE₁₀Mould efficiency of transmission is higher than -1dB's Bandwidth is 5.8GHz, and efficiency of transmission can reach 98.5%.In working band, the transfer efficiency of remaining pattern is less than 0.01%.Although the output performance of this mode converter has the characteristics that broadband, high-purity, efficiency of transmission is relatively still It is not high.In order to expeditiously encourage TE in broader working band₀₁Mould, Wang Yongshuai et al. is introduced in circular waveguide bottom Cross waveguiding structure, that is, first pass through T-shaped power division network by the TE in rectangular waveguide₁₀Mould is divided into four road signals, then will produce Four road signals be injected into cross waveguide positioned at circular waveguide bottom at the same time, produce the TE in cross waveguide₂₂Mould, finally by ripple Changeover portion is led by the TE of generation₂₂Mould is transformed into the TE in circular waveguide₀₁Mould [Wang Yongshuai, Cai Zhongbin, small gram of health, Liu's Yue tinkling of pieces of jade, Zheng Gui By force, Xiao Hongwei.A kind of circular waveguide TE₀₁Mould mode converter [P] patent No.s：CN102280676A,2011-12-14.].It is this Pattern conversion regime is in the range of 28GHz-37GHz, and input reflection is less than -20dB, and output mode is circular waveguide TE₀₁ Mould.Although the introducing of cross waveguide is effectively improved the working band and transfer efficiency of waveguide mode conversion device, cross The waveguide transition structure of waveguide to circular waveguide is complex, to requirement on machining accuracy height.

The content of the invention

For existing rectangular waveguide TE₁₀Mould-circular waveguide TE₀₁It is complicated existing for mode converter, transform length is long, Inefficient etc. deficiency, the present invention propose a kind of high-purity high efficiency broadband TE₀₁Mode converter technical solution.

To achieve these goals, present invention employs following technical scheme：

Structure of the present invention is as follows：

A kind of rectangular waveguide TE₁₀Mould-circular waveguide TE₀₁Mode converter, including rectangular waveguide power division network, quadrupole waveguide TE₀₁Mode transition structure, quadrupole waveguide-circular waveguide transition structure.Wherein：

The rectangular waveguide power division network input terminal is standard rectangular waveguide, and output terminal is the four of 90 degree of outbound course interval A standard rectangular waveguide.Including two-stage Waveguide branching structure, waveguide linkage section and waveguide transition section into.Level-one Waveguide branching Structure is T-shaped work(separation structure, will input standard rectangular waveguide and is divided into the level-one waveguide arm that two narrow side length halve, in level-one Metallic membrane is provided with Waveguide branching structure intermediate projections, to widen bandwidth of operation.At two of level-one waveguide branched structure Output port is respectively arranged with level-one rectangular waveguide changeover portion, and two level-one waveguide arms are faded to standard waveguide output.One The waveguide linkage section that level rectangular waveguide changeover portion is followed by includes one section of rectangular waveguide linkage section and two sections of quadrant arcs Rectangular waveguide turning structure, makes two level-one waveguide arms complete to turn through 180 degree, connects with two level waveguide branched structure input terminal Connect；The two level waveguide branched structure is identical with level-one waveguide branched structure, and level-one waveguide arm is divided into four two level waveguides Branch, is turned so that four two level waveguide arm outbound courses by 135 degree of arc section rectangular waveguide turning structures respectively afterwards 90 degree of interval；Four two level waveguide arms are connected with two level waveguide changeover portion respectively, are converted into standard rectangular waveguide output, finally With quadrupole waveguide TE₀₁Mode transition structure input port connects.

The quadrupole waveguide TE₀₁Mode transition structure be section bore gradual change quadrupole waveguiding structure, its cross-sectional edge The function expression of profile is：r₀+a₁Cos (4t), wherein r₀For section mean radius, a₁For Discontinuous Factors.Wherein a₁With height Increase and reduce.It should be noted that a₁Reduction can be that linear change can also be nonlinear change.Quadrupole waveguide TE₀₁ Four high spots of mode transition structure bottom are respectively arranged with a standard rectangular waveguide input port, with rectangle power division network Output terminal is connected.Quadrupole waveguide TE₀₁Mode transition structure bottom, which is set, also has taper multistage frustum cone structure to carry out impedance matching, To realize the efficiency of transmission of higher and bandwidth of operation.The radius of round platforms wherein at different levels successively decreases step by step, and mating structure total height does not surpass Cross the long side of input standard rectangular waveguide.

Quadrupole waveguide-circular waveguide the transition structure is the waveguiding structure of section bore gradual change, its input terminal and quadrupole ripple Lead TE₀₁Mode conversion structure output end is connected.In quadrupole waveguide-circular waveguide transition structure, its cross-sectional edge profile Function expression is also：r₀+a₁Cos (4t), a₁It is reduced to 0, r with the increase of height₀Also become with the increase of height and turn to r₁, So that it is r that output terminal, which finally transforms to radius,₁Circular waveguide；It should be noted that a₁And r₀Change can be linear change It can be nonlinear change.

The design theory of the present invention is as follows：

From the TE of standard rectangular waveguide input₁₀Pattern electromagnetic wave is first input into rectangular waveguide power division network, by fist-order wave Lead branched structure and be divided into two anti-phase TE of constant amplitude₁₀Mould, enters two level waveguide by waveguide linkage section and waveguide transition section Branched structure, is divided into the TE of four constant amplitudes₁₀Mould, wherein two adjacent TE₁₀Mould is same phase, opposite two TE₁₀Mould is anti- Phase；The four road TE produced₁₀Mould passes through quadrupole waveguide TE₀₁Four projection portions of mode transition structure inject at the same time, in quadrupole ripple Lead TE₀₁Corresponding TE has been encouraged in mode transition structure₀₁Pattern.Due in quadrupole waveguide, interval between each pattern compared with Circular waveguide is wider, therefore can efficiently encourage operating mode, and then effectively suppresses the generation of other patterns.It is placed at the same time Quadrupole waveguide TE₀₁The taper multistage frustum cone structure of mode transition structure bottom can realize preferable impedance matching, reduce work( The influence that subnetwork is brought, realizes TE in broadband₁₀Pattern is to TE₀₁The efficient conversion of pattern.Finally, quadrupole waveguide TE₀₁ TE in mode transition structure₀₁Mould fades to circular waveguide TE by quadrupole waveguide-circular waveguide transition structure₀₁Mould, realizes rectangular wave Lead TE₁₀Pattern is to circular waveguide TE₀₁The conversion of pattern.

Beneficial effects of the present invention are as follows：

By the present invention in that with quadrupole waveguide TE₀₁Mode transition structure, can efficiently accomplish rectangular waveguide TE₁₀Pattern arrives Circular waveguide TE₀₁The conversion of pattern, and can effectively suppress the generation of spurious mode so that the height that whole mode converter has Efficiency, high-purity, wide band feature.In addition, the present invention waveguide mode conversion device it is compact-sized, simply, it is easy to process and Assembling, has good engineering practicability.

Brief description of the drawings

Fig. 1 is the cavity body structure schematic diagram of the present invention

Fig. 2 is the multistage matching round platform schematic diagram of taper of the present invention

Fig. 3 work(separation structure insertion metallic membrane schematic diagrames of the present invention

Fig. 4 is the transmission performance and reflection parameters simulation result schematic diagram of the present invention

Fig. 5 is the output mode purity simulation result schematic diagram of the present invention

Wherein, reference numeral is：1-1 level-one waveguide branched structures, 1-2 level-one waveguide changeover portions, 1-2 level-ones waveguide connection Section, 2-1 two level waveguide branched structures, 2-2 two level waveguide changeover portions, 2-3 two level waveguide linkage sections, 3-1 level Four waveguides TE₀₁Pattern Transformational structure, 3-2 multi-stage taper round platform mating structures, 4 quadrupole waveguides-circular waveguide transition structure.

Embodiment

Below based on above-mentioned theory and designing points, the rectangular waveguide for being operated in a Ka wave bands TE is devised₁₀Mould-circle Waveguide TE₀₁Mode converter and with reference to attached drawing, is described further the advantage of the present invention, but the invention is not limited in the reality Example.

As shown in Figure 1, the present invention is a kind of rectangular waveguide TE₁₀Mould-circular waveguide TE₀₁Mode converter, including rectangular wave Lead power division network, quadrupole waveguide TE₀₁Mode transition structure, and quadrupole waveguide-circular waveguide transition structure.Rectangular waveguide work(subnetting Four output branches of network and quadrupole waveguide TE₀₁The input port vertical connection of four high spots of mode transition structure；Quadrupole waveguide- Circular waveguide transition structure realizes that circular waveguide exports.

Wherein concrete structure is as follows：

The rectangular waveguide power division network input is BJ320 rectangular waveguides (7.112mm*3.556mm), by two-stage waveguide point Branch structure, waveguide linkage section and waveguide transition section composition.Level-one waveguide branched structure is T-shaped work(separation structure, is by radius 90 degree of arc section rectangular turns waveguides of 2.6mm carry out 90 degree and turn, by the BJ320 rectangular waveguides of input be divided into two it is anti-phase, And the waveguide arm that narrow side is 1.778mm；Long (L) 1mm, wide (W) are provided with level-one waveguide branched structure intermediate projections position The metallic membrane of 0.147mm, to widen bandwidth of operation.One is placed with respectively in two output ports of level-one waveguide branched structure Two level-one waveguide branch lines are faded to BJ320 waveguides by level rectangular waveguide changeover portion；The waveguide linkage section being followed by includes two A radius is 90 degree of arc section rectangular waveguide turning structures of 5.8mm, makes two level-one branches complete to turn through 180 degree, with two level Waveguide branching structure input port connects；Two level waveguide branched structure is identical with level-one, respectively by radius be 2.6mm 135 Spend arc section rectangular waveguide turning structure to turn so that four 90 degree of waveguide arm outbound course intervals；This four branches pass through Two level waveguide changeover portion is converted into BJ320 waveguides, finally with quadrupole waveguide TE₀₁Mode transition structure input port connects.

The quadrupole waveguide TE₀₁Mode transition structure be section bore gradual change waveguiding structure, its cross-sectional edge profile Function expression be：r₀+a₁Cos (4t), wherein r₀For 6.55mm, a₁For 1.842mm.Wherein a₁Increase with height and linearly subtract Small is 1mm.Quadrupole waveguide TE₀₁Four projection portions of mode transition structure set four BJ320 rectangular waveguides input ports, with square Four waveguide arms of shape power division network are connected.Mode transition structure bottom sets taper three-level frustum cone structure to carry out impedance Match somebody with somebody, wherein level-one round platform radius is 4.68mm, is highly 0.67mm；Two level round platform radius is 3mm, is highly 1.4mm, the third level Round platform radius is 1.5mm, is highly 0.82mm.

Quadrupole waveguide-circular waveguide the transition structure is the tapered waveguiding structure of section bore, its input terminal and quadrupole ripple Lead TE₀₁Mode transition structure output terminal is in smoothing junction, in transition structure, the function expression of its cross-sectional edge profile For：r₀+a₁Cos (4t), a₁Linearly it is reduced to 0, r with the increase of height₀Also with the increase of height and linear change is 6.6mm, So that output terminal finally transforms to the circular waveguide that radius is 6.6mm.

The operation principle of the present invention is as follows：

From the TE of BJ320 rectangular waveguides input₁₀Pattern electromagnetic wave is first input into rectangular waveguide power division network, by level-one work( Separation structure is divided into two anti-phase TE of constant amplitude₁₀Mould, enters two level work(separation structure by waveguide linkage section, by two level work(point knot Structure is divided into the TE of four constant amplitudes₁₀Mould, wherein two adjacent TE₁₀Mould is same phase, opposite two TE₁₀Mould is anti-phase；Produce Four road TE₁₀Mould is injected at the same time by four projection portions of mode transition structure, and TE is produced in quadrupole waveguide₀₁Pattern.Four It is widely spaced between each pattern in level waveguide, therefore the generation of remaining pattern is suppressed, and is exported as pure TE₀₁Mould Formula.Meanwhile mode transition structure bottom mating frustum cone structure reduces reflection, and TE is realized in broadband₁₀Pattern is to TE₀₁ The efficient conversion of pattern.Finally, the TE in quadrupole waveguide₀₁Mould fades to circular waveguide by quadrupole waveguide-circular waveguide transition structure TE₀₁Mould, realizes rectangular waveguide TE₁₀Pattern is to circular waveguide TE₀₁The conversion of pattern.

Fig. 3 is rectangular waveguide TE₁₀Mould-circular waveguide TE₀₁Mode converter transfer efficiency and its input port reflection, TE in 32GHz-38GHz₀₁The transfer efficiency of mould is above 98%, and wherein transfer efficiency is up to 99.5%；Show the present invention Rectangular waveguide TE can be realized in broadband₁₀Mould-circular waveguide TE₀₁The efficient conversion of pattern.

Fig. 4 is emulation gained rectangular waveguide TE₁₀Mould-circular waveguide TE₀₁Mode converter purity, in 32GHz-38GHz TE₀₁The purity of mould is higher than 99.4%, and it is circular waveguide TE to show that the present invention exports substantially all₀₁Pattern.

Above example is only of the invention for convenience of description, and the present invention may be equally applicable for the rectangular waveguide TE of other frequency ranges₁₀ Mould-circular waveguide TE₀₁On mode converter, the change made under other any Spirit Essences and principle without departing from the present invention, Modification, replacement, combination, simplification are regarded as equivalent substitute mode, are included within protection scope of the present invention.

Claims (3)

1. A kind of 1. rectangular waveguide TE₁₀Mould-circular waveguide TE₀₁Mode converter, it is characterised in that：Including rectangular waveguide power division network, Quadrupole waveguide TE₀₁Mode transition structure, and quadrupole waveguide-circular waveguide transition structure；

   The rectangular waveguide power division network input terminal is standard rectangular waveguide, and output terminal is four marks at 90 degree of outbound course interval Quasi-retangular wave is led, and output terminal and quadrupole waveguide TE₀₁Mode transition structure input port connects；

   The quadrupole waveguide TE₀₁Mode transition structure be section bore gradual change quadrupole waveguiding structure, its cross-sectional edge profile Function expression be：r₀+a₁Cos (4t), wherein r₀For section mean radius, a₁For Discontinuous Factors, a₁Increase with height and subtract It is small；Quadrupole waveguide TE₀₁Four high spots of mode transition structure bottom are respectively arranged with a standard rectangular waveguide input port, with The output terminal of rectangle power division network is connected；Quadrupole waveguide TE₀₁Mode transition structure bottom is additionally provided with taper multistage round platform knot Structure；The radius of round platforms wherein at different levels successively decreases step by step, and total height is no more than the long side of input standard rectangular waveguide；

   Quadrupole waveguide-circular waveguide the transition structure is the waveguiding structure of section bore gradual change, its input terminal and quadrupole waveguide TE₀₁ Mode conversion structure output end connects；In quadrupole waveguide-circular waveguide transition structure, the function representation of its cross-sectional edge profile Formula is also：r₀+a₁Cos (4t), a₁It is reduced to 0, r with the increase of height₀Become with the increase of height and turn to r₁So that output terminal It is r finally to transform to radius₁Circular waveguide.
2. A kind of 2. rectangular waveguide TE as claimed in claim 1₁₀Mould-circular waveguide TE₀₁Mode converter, it is characterised in that：It is described Rectangular waveguide power division network includes two-stage Waveguide branching structure, waveguide linkage section and waveguide transition section.
3. A kind of 3. rectangular waveguide TE as claimed in claim 2₁₀Mould-circular waveguide TE₀₁Mode converter, it is characterised in that：It is described The level-one waveguide branched structure of rectangular waveguide power division network is T-shaped work(separation structure, input standard rectangular waveguide is divided into two narrow The level-one waveguide arm that edge lengths halve, the level-one waveguide branched structure intermediate projections position are provided with metallic membrane；It is described Two output ports of level-one waveguide branched structure are respectively arranged with level-one rectangular waveguide changeover portion, by two level-one waveguide arms Fade to standard waveguide output；The waveguide linkage section that level-one rectangular waveguide changeover portion is followed by include one section of rectangular waveguide linkage section, And two sections of quadrant arc rectangular waveguide turning structures, make two level-one waveguide arms complete to turn through 180 degree, with two level Waveguide branching structure input port connects；The two level waveguide branched structure is identical with level-one waveguide branched structure, by fist-order wave Lead branch and be divided into four two level waveguide arms, turned respectively by 135 degree of arc section rectangular waveguide turning structures afterwards so that four A 90 degree of two level waveguide arm outbound course interval；Four two level waveguide arms are connected with two level waveguide changeover portion respectively, conversion Into standard rectangular waveguide export, finally with quadrupole waveguide TE₀₁Mode transition structure input port connects.