CN101562269A - High-dielectric attenuation-containing small-dimension rectangular waveguide tube - Google Patents

Abstract

The invention relates to a high-dielectric attenuation-containing small-dimension rectangular waveguide tube, which is formed by cascade connection of one or more rectangular metallic waveguide tubes, wherein each rectangular metallic waveguide tube is filled with a nonferromagnetic isotropic medium of a high dielectric constant Epsilon, so that the dimension of the waveguide tube is correspondingly reduced and the attenuation is introduced; and both ends of each rectangular waveguide tube are provided with a flanged interface respectively, so that the attenuation of various values can be realized by the cascade connection of a plurality of rectangular metallic waveguide tubes with filling media of different lengths. The invention can simulate an actual channel and bring convenience to scientific research.

Description

High-dielectric attenuation-containing small-dimension rectangular waveguide tube

Technical field

The present invention relates to electronic communication industry microwave technical field, is the waveguide that a kind of Transmission Microwave is used.

Background technology

At present, in microwave technology, the hollow metal waveguide of all size has been arranged.Can be divided into rectangular waveguide, circular waveguide, ridge waveguide and elliptical guide etc. according to metal tube shape of cross section difference.When the frequency of microwave when not being very high, the size of waveguide is just bigger.For example transmit 5.8GHZ microwave (free space wavelength λ ₀=5.17cm) rectangular hollow waveguide realizes TE ₁₀Single mode transport, the wide b of the long a of its cross sectional dimensions should satisfy 0.5 λ ₀＜a＜λ ₀B＜0.5 λ ₀, i.e. 2.58cm＜a＜5.17cm; B＜2.58cm.Lower size limit is still bigger, seems heavy.When research application need decay, conventional waveguide can not satisfy specific demand, need add attenuator in addition.

Summary of the invention

The objective of the invention is to be mainly used in Transmission Microwave at waveguide, several zero-decrement problems provide a kind of high-dielectric attenuation-containing small-dimension rectangular waveguide tube, and packing material makes that the size of waveguide is corresponding to be reduced, and introduce decay, can obtain any decay by the waveguide cascade simultaneously.By experiment or the application scenario of researcher in the needs decay utilized.

For achieving the above object, conception plans of the present invention is: according to the electromagnetic field microwave theory, in undersized circular hollow metal waveguide, fill a kind of material of high-k, reduced the microwave operation wavelength, thereby make small sized waveguide satisfy transmission requirement.After introducing the filling high dielectric constant, because the losstangenttan of medium _eEffect, dielectric loss is amid a sharp increase, is just utilized in the experiment or the application scenario of have a mind to introducing decay by researcher.Find the filled media that is fit to demand, carry out appropriate design, adopt Rectangular Waveguide Structure according to the dimensional requirement of waveguide design.Designing an end simultaneously is flange-interface, and an end is that the adapter of SMA coaxial interface is realized the electromagnetic sidelong conversion of guided wave.

According to the foregoing invention design, the present invention adopts following technical proposals:

A kind of high-dielectric attenuation-containing small-dimension rectangular waveguide tube, comprise a kind of high-dielectric attenuation-containing small-dimension rectangular waveguide tube, comprise the rectangular metal waveguide, it is characterized in that: constitute by the cascade of one or more described rectangular metal waveguide, fill the nonferromagnetic isotropic medium of high-k ε in each rectangular metal waveguide, reduce thereby the size that makes waveguide is corresponding, and introduce decay.

The above-mentioned transversal face length a=4.14mm of internal channel that holds waveguide, wide b=2.07mm, the internal channel length L is 9.63mm, 19.3mm, three kinds of sizes of 48.2mm, wall thickness 1.5mm.

The medium of filling in the above-mentioned rectangular waveguide is that dielectric constant is ε _r=76.7 distilled water.

The two ends of each above-mentioned rectangular metal waveguide are flange-interface, and the rectangular metal waveguide cascade of the filled media by a plurality of different lengths realizes the decay of multiple value.

It is 76.7 capping that the two ends interface of each above-mentioned rectangular metal waveguide adopts the composite material of rubber and ceramic powders to produce relative dielectric constant, distilled water is sealed, and bonding with the waterproof viscose glue.

In the above-mentioned waveguide, rectangular metal waveguide is connected with waveguide-to-coaxial adapter by the flange-interface of self end, connects the cascade of other end flange-interface another or a plurality of rectangular metal waveguide then.

The present invention has following conspicuous outstanding substantive distinguishing features and remarkable advantage compared with prior art: waveguide of the present invention adopts and fills high-k ε in the rectangular metal waveguide _rThe nonferromagnetic isotropic medium, thereby make corresponding the reducing of size of waveguide, and introduced decay.There is flange-interface at the two ends of each rectangular metal waveguide, and the rectangular metal waveguide cascade of the filled media by a plurality of different lengths can realize the decay of multiple value.The present invention can simulate actual channel, for scientific research is provided convenience.

Description of drawings:

The present invention is further described below in conjunction with accompanying drawing and example.

Fig. 1 is the 3-D view of a rectangular metal waveguide of the present invention.

Fig. 2 is the vertical view of Fig. 1.

Fig. 3 is the profile (internal channel is filled media, and is sealed by capping) at A-A place among Fig. 2.

Fig. 4 is the 3-D view of waveguide-to-coaxial adapter.

Fig. 5 is the upward view of waveguide-to-coaxial adapter.

Fig. 6 is the sectional arrangement drawing of waveguide-to-coaxial adapter.

Fig. 7 is the connection diagram of the present invention and waveguide-to-coaxial adapter.

Embodiment:

Constructed embodiment accompanying drawings of the present invention is as follows:

Referring to Fig. 1 Fig. 2 and Fig. 3, this high-dielectric attenuation-containing small-dimension rectangular waveguide tube, comprise a kind of high-dielectric attenuation-containing small-dimension rectangular waveguide tube 1, it is characterized in that: constitute by one or more described rectangular metal waveguide 1 cascades, fill the nonferromagnetic isotropic medium 3 of high-k ε in each rectangular metal waveguide 1, reduce thereby the size that makes waveguide is corresponding, and introduce decay.

The two ends of each rectangular metal waveguide 1 are flange-interface, and rectangular metal waveguide 1 cascade of the filled media by a plurality of different lengths realizes the decay of multiple value.

Design as follows:

1. according to demand, choose the filled media material.Filling dielectric constant in rectangular metal waveguide 1 is ε _r=76.7 distilled water.

2. the operation wavelength in the medium 3 is calculated:

We know, in real medium $v_p=\frac{\mathrm{\&omega;}}{\mathrm{\&beta;}}=\frac{1}{\sqrt{\mathrm{\&mu;\&epsiv;}}}{\left[\frac{2}{\sqrt{1+{\left(\frac{\mathrm{\&sigma;}}{\mathrm{\&omega;\&epsiv;}}\right)}^2+1}}\right]}^{\frac{1}{2}}<\frac{1}{\sqrt{\mathrm{\&mu;\&epsiv;}}}$

Because distilled water is medium 3 in microwave band, $\frac{\mathrm{\&sigma;}}{\mathrm{\&omega;\&epsiv;}}<<1,$ Thereby when microwave operational frequencies f=5.8G, $v_p\&ap;\frac{1}{\sqrt{\mathrm{\&mu;\&epsiv;}}},$ The medium wavelength of microwave is like this: $\mathrm{\&lambda;}=\frac{1}{f\sqrt{\mathrm{\&mu;\&epsiv;}}}=\frac{{\mathrm{\&lambda;}}_0}{\sqrt{{\mathrm{\&epsiv;}}_r}}=\frac{5.17\mathrm{cm}}{\sqrt{76.7}}=5.91\mathrm{mm}$

3. rectangular metal waveguide 1 size design: be to realize TE ₁₀Single mode transport, theory require the wide b of its long a of cross section inwall size should satisfy 0.5 λ＜a＜λ, b＜0.5 λ.In order to make conductor losses less, get b=0.5a. on the engineering approximately simultaneously

As scheme to customize 5.8G microwave rectangle copper metal waveguide, get the long a=0.7 λ=4.14mm of inside dimension; Wide b=0.5a=2.07mm;

Wall thickness is calculated by skin depth, wherein the conductivity of copper=5.8 * 10 ⁷S/m, then skin depth $\mathrm{\&delta;}=\sqrt{\frac{1}{\mathrm{\&pi;f\&mu;\&sigma;}}}=\sqrt{\frac{1}{3.14\&times;5.8\&times;{10}^9\&times;4\mathrm{\&pi;}\&times;{10}^{-7}\&times;5.8\&times;{10}^7}}=0.87\mathrm{\&mu;m},$ Consider mechanical strength, getting thickness is 1.5mm;

By this specification, can transmit the TE of 5.8G in the rectangular metal waveguide 1 ₁₀The mould microwave is operated in the single mode mode.

4. loss is calculated and is measured

Finding selected dielectric loss angle tangent is tan δ _e=0.157

Calculate cut-off wavelength ${\mathrm{\&lambda;}}_c=\frac{2\mathrm{\&pi;}}{K_C}=\frac{2}{\sqrt{{\left(\frac{m}{a}\right)}^2+{\left(\frac{n}{b}\right)}^2}}=2a=8.28\mathrm{mm}$

The conductivity of copper is σ=5.813 * 10 ⁷So S/m is sheet resistance $R_s=\sqrt{\frac{\mathrm{\&omega;}{\mathrm{\&mu;}}_0}{2\mathrm{\&sigma;}}}=0.0198\mathrm{\&Omega;}$

Conductor losses ${\mathrm{\&alpha;}}_c=\frac{R_S}{b\sqrt{\frac{\mathrm{\&mu;}}{\mathrm{\&epsiv;}}}\sqrt{1-{\left(\frac{\mathrm{\&lambda;}}{2a}\right)}^2}}[1+\frac{2b}{a}{\left(\frac{\mathrm{\&lambda;}}{2a}\right)}^2]=0.479\mathrm{Np}/m=4.15\mathrm{dB}/m$

Being calculated as follows of dielectric loss:

${\mathrm{\&alpha;}}_d=\frac{\mathrm{\&pi;}\tan {\mathrm{\&delta;}}_e}{\mathrm{\&lambda;}\sqrt{1-{\left(\frac{\mathrm{\&lambda;}}{{\mathrm{\&lambda;}}_c}\right)}^2}}=119.15\mathrm{Np}/m=1033.8\mathrm{dB}/m$

Total losses are α=α _d+ α _c=1038dB/m

5. for obtaining 10dB, 20dB, the fixed attenuation value of 50dB is got length L and is respectively 9.63mm, 19.3mm, 48.2mm in Fig. 3.

6. according to the high medium small scale of the L size fabrication and processing band decay rectangle metallic waveguide 1 of Fig. 2, Fig. 3 and step 5, material selection is a red copper; Make waveguide-to-coaxial adapter according to Fig. 5, Fig. 6 dimensioned, material selection is a red copper; In waveguide-to-coaxial adapter 6 and decay rectangle metallic waveguide, fill distilled water as medium 3 materials; Use the composite material of rubber and ceramic powders to produce relative dielectric constant by Fig. 3 and be 76.7 capping 5, water is sealed, and bonding with waterproof viscose 4.

7. when using, according to the required pad value of engineering, the high medium small scale band decaying wave conduit of choosing some makes up, thereby obtains the required high medium small scale band decaying wave conduit with any pad value.

Claims (6)

1. high-dielectric attenuation-containing small-dimension rectangular waveguide tube, comprise that rectangular metal waveguide (1) is characterized in that: constitute by one or more described rectangular metal waveguides (1) cascade, fill the nonferromagnetic isotropic medium (3) of high-k ε in each rectangular metal waveguide (1), reduce thereby the size that makes waveguide is corresponding, and introduce decay.

2. high-dielectric attenuation-containing small-dimension rectangular waveguide tube according to claim 1 is characterized in that: the transversal face length a=4.14mm of internal channel of described rectangular metal waveguide (1), wide b=2.07mm, the internal channel length L is 9.63mm, 19.3mm, three kinds of sizes of 48.2mm, wall thickness 1.5mm.

3. high-dielectric attenuation-containing small-dimension rectangular waveguide tube according to claim 1 is characterized in that: medium (3) dielectric constant of filling in described rectangular metal waveguide (1) is ε _r=76.7 distilled water.

4. high-dielectric attenuation-containing small-dimension rectangular waveguide tube according to claim 1, it is characterized in that: the two ends of each described rectangular metal waveguide (1) are flange-interface, and rectangular metal waveguide (1) cascade of the filled media by a plurality of different lengths realizes the decay of multiple value.

5. high-dielectric attenuation-containing small-dimension rectangular waveguide tube according to claim 3, it is characterized in that: the two ends interface of each described rectangular metal waveguide (1), adopting the composite material of rubber and ceramic powders to produce relative dielectric constant is 76.7 capping (5), distilled water is sealed, and bonding with waterproof viscose glue (4).

6. high-dielectric attenuation-containing small-dimension rectangular waveguide tube according to claim 1, it is characterized in that: a rectangular waveguide (1) is by the flange-interface of self end, be connected with waveguide-to-coaxial adapter (6), connect other end flange-interface (2) cascade another or a plurality of rectangular metal waveguide (1) then.

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