CN101707276B - Design method of waveguide single-port mismatch device - Google Patents

Abstract

The invention discloses a design method of a waveguide single-port mismatch device. The design method is realized by designing the broad side dimension and narrow side dimension of a waveguide port of a waveguide cavity (2), the length of the waveguide single-port mismatch device, an absorber (3), a flange (1) and a back cover (4). The reflective property of the waveguide single-port mismatch device depends only on the narrow side dimension of the waveguide port and has nothing to do with the thickness, thus eliminating the influence of frequency. The waveguide single-port mismatch device has consistent reflective property within full work frequency range and flat frequency response curve. The frequency response property of the waveguide single-port mismatch device is improved considerably compared with that of a two-port mismatch device.

Description

A kind of method for designing of waveguide single-port mismatch device

Technical field

The present invention relates to the method for designing of a kind of method for designing of mismatch device, particularly a kind of waveguide single-port mismatch device.

Background technology

Microwave and millimeter wave frequency range Wave guide system is extensively adopted with good stable property and repeated characteristics, so the value of Wave guide system S parameter is unified most important.At present, adopt the test stone of waveguide two-port mismatch device both at home and abroad usually as the Wave guide system reflection amplitudes.

Waveguide two-port mismatch device is made up of a series of certain thickness waveguide sheets, and its broadside size is identical with corresponding band standard waveguide mouth, and narrow limit is more young than corresponding band standard waveguide.Such waveguide sheet is inserted in the waveguide test macro, because the more coupled standard mouth size of its narrow limit size is little, so form the staircase waveform guide structure in the junction.The main mould TE of transmission in rectangular waveguide ₁₀During mould, electric field has only the Ey component, and magnetic field has only Hx and Hy component.Incident wave TE ₁₀When mould runs into the ladder waveguide, because TE ₁₀The field component of mould does not satisfy the boundary condition that staircase waveform is led, and certainly leads to the field component that makes new advances.Power line bends, compresses, and magnetic line of force shape invariance, so at waveguide ladder place, electric field energy is concentrated relatively, equivalence is a shunt capacitance.Form the staircase waveform guide structure in the junction, two ends, the two ends reflected signal superposes mutually, forms stable moving standing wave.

The reflection characteristic of waveguide two-port mismatch device depends on the thickness and the narrow limit size of two-port mismatch device.Because the overlaying relation difference that thickness is introduced the two ends reflected signal with frequency causes on the work full frequency band, stationary wave characteristic is a curve with frequency change, and the Frequency Response of waveguide two-port mismatch device is very poor, and this is the deficiency of two-port mismatch device.

Summary of the invention

The object of the invention is to provide a kind of method for designing of waveguide single-port mismatch device, solves the two-port mismatch device as the relatively poor problem of reflection amplitudes standard Frequency Response.

A kind of concrete steps of method for designing of waveguide single-port mismatch device are:

The first step: the broadside size and the narrow limit size of design waveguide cavity waveguide mouth

To main mould TE ₁₀Mould is analyzed.For the different mismatch errors of introducing of elimination pattern, waveguide single-port mismatch device broadside size is identical with the standard waveguide mouth.

If a, b are respectively the broadside size and the narrow limit size of standard waveguide mouth, b ' is the narrow limit of a waveguide single-port mismatch device size.In waveguide single-port mismatch device access standard waveguide system, the reflection amplitudes design object is:

$\left|\mathrm{\Γ}\right|=\left|\frac{b^{\′}-b}{b^{\′}+b}\right|=\frac{{b-b}^{\′}}{b^{\′}+b}$ (1)

When the reflection amplitudes design object was confirmed, the narrow limit of waveguide single-port mismatch device was of a size of:

$b^{\′}=\left(\frac{1-\left|\mathrm{\Γ}\right|}{1+\left|\mathrm{\Γ}\right|}\right)b$ (2)

Get from formula (two): the narrow limit of waveguide single-port mismatch device size is littler than the narrow limit of standard waveguide mouth size; When waveguide single-port mismatch device is inserted the waveguide test macro; The junction forms the staircase waveform guide structure; For perfect absorber, incoming signal is with separated into two parts: a part is reflected in the port junction, and the residue incoming signal is by the absorbed inside bulk absorption.Waveguide single-port mismatch device port reflection characteristic depends on the narrow limit of waveguide single-port mismatch device size, and is irrelevant with waveguide single-port mismatch device broadside size, length and operating frequency range, in full bandwidth, has consistent reflection characteristic, thereby improved Frequency Response.

Above-mentioned design process is that the hypothesis absorber is desirable fully; Have and carry out under the condition of hypersorption characteristic; But the actual absorption body is also not exclusively desirable, and the actual reflected value that obtains will be less than the design object value, and this error can be revised through the narrow limit size that changes waveguide single-port mismatch device.Absorber reaches the return loss index less than 40dB, and reflection coefficient changes narrow limit size quantity and can revise this error term suc as formula (three) less than 0.01.

${\mathrm{\Δ\; b}}^{\′}=\frac{{-0.02b}^{\′}}{(1-|\mathrm{\Γ}|+0.01)(1+|\mathrm{\Γ}\left|\right)}$ (3)

In the formula (three), Δ b ' is a narrow limit round-off error size, | г | be the reflection amplitudes design object, b ' is the narrow limit size that formula () is designed.Reply b ' work is further revised, and the narrow limit of design waveguide single-port mismatch device is of a size of b '+Δ b '.

Second step: the length of design waveguide single-port mismatch device

Waveguide load has absorption characteristic, and its length is 3～5 times of low-limit frequency corresponding wavelength, and return loss is greater than 40dB.The length of waveguide single-port mismatch device and corresponding band waveguide load equal in length.

The 3rd step: design absorber

The absorber of waveguide single-port mismatch device is the carbonyl iron of vertebra shape structure.End is a cuboid, from the waveguide mouth inward direction look, cuboid upper and lower, left and right four sides fits tightly with the waveguide cavity inwall on four sides, fixes through the glue bond mode.Vertebra shape absorber has four faces, and the bottom surface is a right-angled triangle, and three sides intersect at the summit.Wherein, two sides are right-angled triangle, from the waveguide mouth inward direction look two sides respectively with the waveguide cavity inwall right side with below fit tightly, adopt the glue bond mode to fix.Another side is an acute triangle.Cuboid and vertebra body are that one processes, and the absorber total length is 3～4 times of low-limit frequency corresponding wavelength.

The 4th step: design flange and bonnet

Waveguide single-port mismatch device is the standard waveguide flange, is connected with the waveguide test macro with the pin mode with screw.

Waveguide single-port mismatch device is terminal, and bonnet is convex shape with the back lid may enclose, and type head and waveguide cavity waveguide mouth are measure-alike, fixes with waveguide cavity with how much cooperations, glue, screw mode.

Above-mentioned steps designs length, absorber, flange and the bonnet of the broadside size of waveguide cavity waveguide mouth and narrow limit size, waveguide single-port mismatch device respectively.At first design waveguide cavity, design absorber again, absorber is positioned in the waveguide cavity, design flange and bonnet afterwards, and the assembling waveguide cavity.So just design different waveguide single-port mismatch devices.

The reflection characteristic of waveguide single-port mismatch device only depends on the narrow limit of waveguide mouth size, and is irrelevant with thickness, eliminated the influence of frequency, has consistent reflection characteristic at the work full frequency band, and frequency response curve is smooth.The Frequency Response of waveguide single-port mismatch device is greatly improved than the two-port mismatch device.

Description of drawings

The waveguide single-port mismatch device two dimensional cross-section sketch map of the method for designing of a kind of waveguide single-port mismatch device of Fig. 1;

The waveguide single-port mismatch device three-dimensional appearance sketch map of the method for designing of a kind of waveguide single-port mismatch device of Fig. 2;

The three-dimensional generalized section of the waveguide single-port mismatch device of the method for designing of a kind of waveguide single-port mismatch device of Fig. 3;

The absorber sketch map of the method for designing of a kind of waveguide single-port mismatch device of Fig. 4.

1. flange 2. waveguide cavity 3. absorbers 4. bonnets 5. connecting holes

Embodiment

A kind of concrete steps of method for designing of waveguide single-port mismatch device are:

The first step: the broadside size and the narrow limit size of design waveguide cavity waveguide mouth

To main mould TE ₁₀Mould is analyzed.For the different mismatch errors of introducing of elimination pattern, waveguide single-port mismatch device broadside size is identical with the standard waveguide mouth.

If a, b are respectively the broadside size and the narrow limit size of standard waveguide mouth, b ' is the narrow limit of a waveguide single-port mismatch device size.In waveguide single-port mismatch device access standard waveguide system, the reflection amplitudes design object is:

$\left|\mathrm{\Γ}\right|=\left|\frac{b^{\′}-b}{b^{\′}+b}\right|=\frac{{b-b}^{\′}}{b^{\′}+b}$ (1)

When the reflection amplitudes design object was confirmed, the narrow limit of waveguide single-port mismatch device was of a size of:

$b^{\′}=\left(\frac{1-\left|\mathrm{\Γ}\right|}{1+\left|\mathrm{\Γ}\right|}\right)b$ (2)

Get from formula (two): the narrow limit of waveguide single-port mismatch device size is littler than the narrow limit of standard waveguide mouth size; When waveguide single-port mismatch device is inserted the waveguide test macro; The junction forms the staircase waveform guide structure; For perfect absorber 3, incoming signal is with separated into two parts: a part is reflected in the port junction, and the residue incoming signal is absorbed by absorbed inside body 3.Waveguide single-port mismatch device port reflection characteristic depends on the narrow limit of waveguide single-port mismatch device size, and is irrelevant with waveguide single-port mismatch device broadside size, length and operating frequency range, in full bandwidth, has consistent reflection characteristic, thereby improved Frequency Response.

Above-mentioned design process is that hypothesis absorber 3 is desirable fully; Have and carry out under the condition of hypersorption characteristic; But actual absorption body 3 is also not exclusively desirable, and the actual reflected value that obtains will be less than the design object value, and this error can be revised through the narrow limit size that changes waveguide single-port mismatch device.Absorber 3 reaches the return loss index less than 40dB, and reflection coefficient changes narrow limit size quantity and can revise this error term suc as formula (three) less than 0.01.

${\mathrm{\Δb}}^{\′}=\frac{{-0.02b}^{\′}}{(1-|\mathrm{\Γ}|+0.01)(1+|\mathrm{\Γ}\left|\right)}$

In the formula (three), Δ b ' is a narrow limit round-off error size, | г | be the reflection amplitudes design object, b ' is the narrow limit size that formula () is designed.Reply b ' work is further revised, and the narrow limit of design waveguide single-port mismatch device is of a size of b '+Δ b '.

Second step: the length of design waveguide single-port mismatch device

Waveguide load has absorption characteristic, and its length is 3～5 times of low-limit frequency corresponding wavelength, and return loss is greater than 40dB.The length of waveguide single-port mismatch device and corresponding band waveguide load equal in length.

The 3rd step: design absorber

The absorber 3 of waveguide single-port mismatch device is the carbonyl iron of vertebra shape structure.End is a cuboid, from the waveguide mouth inward direction look, cuboid upper and lower, left and right four sides fits tightly with waveguide cavity 2 inwalls on four sides, fixes through the glue bond mode.Vertebra shape absorber 3 has four faces, and the bottom surface is a right-angled triangle, and three sides intersect at the summit.Wherein, two sides are right-angled triangle, from the waveguide mouth inward direction look two sides respectively with the waveguide cavity 2 inwall right sides with below fit tightly, adopt the glue bond mode to fix.Another side is an acute triangle.Cuboid and vertebra body are that one processes, and absorber 3 total lengths are 3～4 times of low-limit frequency corresponding wavelength.

The 4th step: design flange and bonnet

Waveguide single-port mismatch device is a standard waveguide flange 1, is connected with the waveguide test macro with the pin mode with screw.

Waveguide single-port mismatch device is terminal, and bonnet 4 is convex shape with bonnet 4 sealings, and type head and waveguide cavity 2 waveguide mouths are measure-alike, fixes with waveguide cavity 2 with how much cooperations, glue, screw mode.

Above-mentioned steps designs length, absorber 3, flange 1 and the bonnet 4 of the broadside size of waveguide cavity 2 waveguide mouths and narrow limit size, waveguide single-port mismatch device respectively.At first design waveguide cavity 2, design absorber 3 again, absorber 3 is positioned in the waveguide cavity 2, design flange 1 and bonnet 4 afterwards, and assembling waveguide cavity 2.So just design different waveguide single-port mismatch devices.

Claims (1)

1. the method for designing of a waveguide single-port mismatch device is characterized in that the concrete steps of this method are:

The first step: the broadside size and the narrow limit size of design waveguide cavity waveguide mouth

To main mould TE ₁₀Mould is analyzed; For the different mismatch errors of introducing of elimination pattern, waveguide single-port mismatch device broadside size is identical with the standard waveguide mouth;

If a, b are respectively the broadside size and the narrow limit size of standard waveguide mouth, b ' is the narrow limit of a waveguide single-port mismatch device size; In waveguide single-port mismatch device access standard waveguide system, the reflection amplitudes design object is:

$\left|\mathrm{\Γ}\right|=\left|\frac{b^{\′}-b}{b^{\′}+b}\right|=\frac{{b-b}^{\′}}{b^{\′}+b}$ (1)

When the reflection amplitudes design object was confirmed, the narrow limit of waveguide single-port mismatch device was of a size of:

$b^{\′}=\left(\frac{1-\left|\mathrm{\Γ}\right|}{1+\left|\mathrm{\Γ}\right|}\right)b$ (2)

Get from formula (two): the narrow limit of waveguide single-port mismatch device size is littler than the narrow limit of standard waveguide mouth size; When waveguide single-port mismatch device is inserted the waveguide test macro; The junction forms the staircase waveform guide structure; For perfect absorber (3), incoming signal is with separated into two parts: a part is reflected in the port junction, and the residue incoming signal is absorbed by absorbed inside body (3); Waveguide single-port mismatch device port reflection characteristic depends on the narrow limit of waveguide single-port mismatch device size, and is irrelevant with waveguide single-port mismatch device broadside size, length and operating frequency range, in full bandwidth, has consistent reflection characteristic, thereby improved Frequency Response;

Above-mentioned design process is that hypothesis absorber (3) is desirable fully; Have and carry out under the condition of hypersorption characteristic; But actual absorption body (3) is also not exclusively desirable; The actual reflected value that obtains will be less than the design object value, and this error can be revised through the narrow limit size that changes waveguide single-port mismatch device; Absorber (3) reaches the return loss index less than 40dB, and reflection coefficient changes narrow limit size quantity and can revise this error term suc as formula (three) less than 0.01;

${\mathrm{\Δ\; b}}^{\′}=\frac{{-0.02b}^{\′}}{(1-|\mathrm{\Γ}|+0.01)(1+|\mathrm{\Γ}\left|\right)}$ (3)

In the formula (three), Δ b ' is a narrow limit round-off error size, | г | be the reflection amplitudes design object, b ' is the narrow limit size that formula () is designed; Reply b ' work is further revised, and the narrow limit of design waveguide single-port mismatch device is of a size of b '+Δ b ';

Second step: the length of design waveguide single-port mismatch device

Waveguide load has absorption characteristic, and its length is 3～5 times of low-limit frequency corresponding wavelength, and return loss is greater than 40dB; The length of waveguide single-port mismatch device and corresponding band waveguide load equal in length;

The 3rd step: design absorber

The absorber of waveguide single-port mismatch device (3) is the carbonyl iron of vertebra shape structure; End is a cuboid, from the waveguide mouth inward direction look, cuboid upper and lower, left and right four sides fits tightly with waveguide cavity (2) inwall on four sides, fixes through the glue bond mode; Vertebra shape absorber (3) has four faces, and the bottom surface is a right-angled triangle, and three sides intersect at the summit; Wherein, two sides are right-angled triangle, from the waveguide mouth inward direction look two sides respectively with waveguide cavity (2) the inwall right side with below fit tightly, adopt the glue bond mode to fix; Another side is an acute triangle; Cuboid and vertebra body are that one processes, and absorber (3) total length is 3～4 times of low-limit frequency corresponding wavelength;

The 4th step: design flange and bonnet

Waveguide single-port mismatch device is standard waveguide flange (1), is connected with the waveguide test macro with the pin mode with screw;

Waveguide single-port mismatch device is terminal, and bonnet (4) is convex shape with bonnet (4) sealing, and type head and waveguide cavity (2) waveguide mouth is measure-alike, fixes with waveguide cavity (2) with how much cooperations, glue, screw mode;

Above-mentioned steps designs length, absorber (3), flange (1) and the bonnet (4) of the broadside size of waveguide cavity (2) waveguide mouth and narrow limit size, waveguide single-port mismatch device respectively; At first design waveguide cavity (2), design absorber (3) again, absorber (3) is positioned in the waveguide cavity (2), design flange (1) and bonnet (4) afterwards, and assembling waveguide cavity (2); So just design different waveguide single-port mismatch devices.

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