Waveguide distribution system

FIELD: radio communication facilities; waveguide microwave measurement technology and antenna engineering; stand-alone antennas and antenna arrays.

SUBSTANCE: proposed waveguide distribution system designed for operation within wide frequency band (>5 - 7% of f0) has four line-column dividers each incorporating one distribution column and n lines of multiple-slit directional couplers sequentially integrated by common main-line waveguide and microwave adders. Width of directional-coupler waveguide channels a = (0.7 ± 0.1)λ, where λ is free-space wavelength; its height b ≤ 0.2λ, slit length being not over ≤ 0.2λ. Microwave adder is assembled of four twin T-joints with waveguide channel height not over b ≤ 0.2λ.

EFFECT: enlarged functional capabilities.

1 cl, 3 dwg

 

The invention relates to radio communications industry and can be used in waveguide microwave measurement and antenna technology both independently and as part of antenna arrays.

Known small megaplay waveguide power divider [see U.S. Patent No. 5196812, NCI 33/113, 1994], consisting of waveguide sections connected to each other through a common wide wall through two elongated holes. The input section forks the given microwave energy into several parallel waveguide sections similar in design.

Known multi-channel divider using composed of directional couplers on the crossed waveguides [see U.S. Patent No. 3518576, NCI 333-10, 1970], consisting of N directional couplers, joint rectangular main waveguide, and having N branched channels of square cross section, spaced from one of the wide walls of the main waveguide. As elements of communication in each tap are two narrow slits spacedwhere λinthe wavelength in the waveguide, and the branched channels are oriented at an angle of 90° to the axis of the main waveguide.

Known multichannel waveguide divider consisting of N multislot directed otvet the residents, United by the main waveguide, and having N branched channels oriented at an angle β to the axis of the main waveguide and located on both of its wide walls. Slit cut in the common broad wall of the branch and trunk channels [see Patent No. 2158049 RF, NR 5/18, H01Q 13/26, 03.1999,].

The closest in technical essence and design to the proposed technical solution is the distribution system [waveguide distribution system onboard antenna with electronic control beam waveguide. Aieinai, Redmondstraat, Mitin, V.A., Proc. of "Antenna", issue 6(61) 2002], consisting of four line-column dividers, powered using microwave-adder, each of which includes one dispenser-column and n-lines rows.

As distributors columns, and line-line, consist of series-connected in each dispenser General trunk waveguide multislot directional couplers (BUT).

The main disadvantages of the known technical solutions are:

- limited width of the operating frequency range (Δf˜5-7% f0), where f0- frequency design;

- strong change of the amplitude distribution linesand the consequent violation of the amplitude distribution in up the round phased antenna array (PAA) in the range of 5-7% f 0where Pithe output power of the first channel strips, RI- power input line;

- disruption of the microwave adder and, as a consequence, the destruction of the total differential characteristics of the waveguide distribution system (VRS) and the corresponding directional diagrams) (total channel - Σ, differential channels - ΔAZand ΔMIND, difference-differential channel - ΔΔ) in the composition of the HEADLIGHTS in the range of 5-7% f0.

The technical result of the proposed solution is to extend the operating frequency range while simultaneously stabilize in this range the amplitude-phase distribution in the aperture of the HEADLIGHTS.

The essence of the invention consists in the improved functionality HRV when working in a wide range of frequencies (>5-7% f0), which is provided by the fact that the waveguide distribution system, consisting of four line-column dividers, each of which are made of multislot directional couplers, consistently common trunk waveguide, one grid-columns and n lines-lines, and microwave adder, waveguide channels directional couplers made of width a=(0.7±0.1)λwhere λ is the wavelength in free space, and the height b≤0.2λin many who Eselevich directional couplers length of cracks does not exceed 1 ≤ 0.3λand microwave adder is made of four double tees with waveguide channels with a height of no more than b≤0.2λ [see Reference "elements of radio-electronic devices", editor Dr. Sci, Ph.D. Vigolana, Msiac, Moscow, Energia, 1977, str, 555-556].

The possibility of the implementation of the proposed technical solution is the fact that

1) these limits change the width of the waveguide channels DIF:=(0.7±0.1)λ - allow bandwidth wave H10through HRV up to 40% f0and remove the fundamental limitation of the operating frequency range, resulting each time in microwave devices, when used waveguide channels with very different dimensions "a", one of which is close toand the other end to a=λ and to eliminate the in-phase addition reflected from BUT signals;

2) reduction in the height of all waveguides line-column dividers to size b≤0.2λ also allows you to extend the working range of HRV and stabilize in this range the amplitude distribution, ensuring efficiency≥0.5-0.6;

3) the limitation imposed on the size of the slit: 1≤0.3λ - allows to stabilize the transient decay BUT distributors-columns and lines-lines in a wide range of frequencies and thereby stabilizing the amplitude distribution and the efficiency of the HRV in the frequency band in comparison with the prototype;

4) the use of microwave adder double tees with height channels b≤0.2λ allows you to extend the working frequency band of the microwave adder to 35-40% f0that retains its ability to form the amplitude-phase distribution corresponding to Σ-Δ the chart orientation of the HEADLIGHTS.

Consequently, the proposed technical solutions are provided with stable amplitude and phase characteristics of HRV in the range of not less than (35-40%)f0.

The essence of the proposed technical solution is illustrated by the following description and appended certini:

1 shows a diagram of the waveguide distribution system.

Figure 2 shows the amplitude distribution of the prototype (the vertical plane) in the frequency range 40% f0.

Figure 3 shows the amplitude distribution (AR) (vertical plane) of a particular implementation of the proposed technical solutions in the range of up to 40% f0.

Waveguide distribution system contains

four line-column divider(1, 2, 3, 4), in each of which includes one dispenser-column (51-4) and n-lines-lines (61-n);

- each of the four distributors-columns and lines-lines made of multislot directional couplers (7), connected in series in each will distribute the Le column and each line is a single line trunk waveguide (8), and

- Microwave-adder (9), consisting of four double-tees (10)having four inputs: total (Σ), differential ΔAZthat ΔMINDand differential-difference (ΔΔ).

A specific example of implementation of the proposed technical solutions:

- HRV includes four line-column divider, each of which contains the control column and fourteen lines-lines consisting of BUT United in each grid-column and line-line its main waveguide, and forming a corresponding number BUT branched channels. Number BUT in the dispenser-column (for example, j=14), lines-lines (e.g., I=14-44).

- Line-column dividers have the following section of the waveguide channels:

1) the main and branched waveguides of the distributor-column: a=0.7λ, b=0.15λ;

2) the main waveguides lines-lines: a=0.7λ, b=0.2λ;

3) branched channels lines-lines: a=0.65λ, b=0.12λ;

the sizes of gaps in the field of communication BUT:

- the length of the slits l=(0,3-0.24)λ;

- Microwave-adder is made of four double tees with the height of the waveguide channels 0.15λ.

Implemented electrical characteristics of the proposed distribution system:

- operating frequency range up to 40% f0where the serviceability HRV;

- the maximum change in efficiency and amplitude distribution for the example grid is a column in the frequency range up to 40% f 0shown in figure 3.

The principle of the proposed device (analysis mode HRV transfer) is as follows:

Microwave energy from any of the inputs HRV (total Σdifferential ΔMINDand ΔAZor difference-difference ΔΔ) is divided in the microwave adder into four equal parts (the unequal division of power and efficiency are the main characteristics of the adder) and enters the main channels (8) distributors column (5), respectively. The phase of the signals in the channels (8) are defined so that from any of the entrances powered HRV, the four line-column divider (1-4) form the same amplitude distribution in the following mutual phases:

- total (Σ) channel - all in-phase dividers;

- differential channels (ΔAZand ΔMIND) - pair in opposite phase in azimuth and elevation planes, respectively, and

- the difference-differential channel (ΔΔ) - all adjacent dividers wsaenoprotoopt.

Stability of fixed amplitude characteristics of microwave-adder frequency range and preserving the phase relationship between the factors (1-4) provide for the formation of the total differential characteristics of HRV and accordingly the total differential NAM as part of HEADLAMP when the restructuring is astate in a wide band of frequencies. This problem is solved through the use of double tees, made of waveguide height b<0.2λ.

The shape of the amplitude distribution and the efficiency of the HRV is determined by the length of the slits 1 and sections of waveguide channels (a, b) distributors-columns and lines-lines. Changing the shape of the AR in the frequency range due to a change in the transient damping (Ln). In a wide band of frequencies (>20% f0) transient attenuation directional couplers in General vary with the operating frequency tuning, which leads to a strong distortion of the shape of the amplitude distribution (figure 2). Change AR when the frequency change in the proposed technical solution is minimized by limiting the sizes of gaps due directional couplers (1≤0.3λ) and waveguide channels (a=(0.7±0.1)λb≤0.2λ)that allows you to implement additional positive effect to improve the layout and weight characteristics HRV, to ensure that important for wide-angle scanning the reduction steps of radiating elements in the aperture of the antenna array.

Thus, technical appraisal and economic benefits of the proposed solution compared to the prototype are to increase the operating frequency range HRV up to 35-40% f0simultaneous stabilization in this range amplit the bottom-phase distribution and in addition, the reduced mass, improving the compactness of the design, and when used in the composition of the HEADLIGHTS in the expansion of the sector scan by reducing the waveguide channels HRV and a corresponding reduction steps emitters in the aperture grille.

Waveguide distribution system (VRS), consisting of four line-column dividers, each of which are made of multislot directional couplers, consistently common trunk waveguide, one grid-columns and n lines-lines, and microwave adder, characterized in that the channels of directional couplers made of width a=(0,7±0,1)λand the height b≤0,2λwhere λ is the wavelength in free space, and the length cracks in multislot directional taps does not exceed 1≤0,3λand microwave adder built from four double tees with the height of the waveguide channels is not more than b≤0,2λ.



 

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