CN1059621A - Parabolic Antenna High Efficiency Feed Source - Google Patents

Abstract

Translated fromChinese

一种提高微波抛物面天线效率的馈源，其特征是在圆锥喇叭的内部和喇叭口的附近均放置有介质，圆锥喇叭中的TE₁₁模，在介质中激励出HE₁₁和HE₁₂模，控制介质的直径和长度，可以得到火山口形状的馈源辐射方向图，使抛物面反射面的口径场中间部分分布均匀，边缘照射在-20db左右，使前馈形抛物面天线的效率从0.6增加到0.75，天线增益提高1db，相当反射面直径增加12％，馈源的重量下降3/4，成本降低2/3。

A feed source for improving the efficiency of a microwave parabolic antenna is characterized in that a medium is placed inside the conical horn and near the horn mouth, and the TE₁₁ mode in the conical horn excites the HE₁₁ and HE₁₂ modes in the medium, and the control The diameter and length of the medium can obtain the radiation pattern of the feed source in the shape of a crater, so that the middle part of the aperture field of the parabolic reflector is evenly distributed, and the edge is irradiated at about -20db, so that the efficiency of the feedforward parabolic antenna increases from 0.6 to 0.75 , the gain of the antenna is increased by 1db, the diameter of the reflecting surface is increased by 12%, the weight of the feed source is reduced by 3/4, and the cost is reduced by 2/3.

Description

High-efficiency feeding source of paraboloid antenna

A kind of high efficiency feed that is used for parabolic antenna belongs to the radioelectronics field.

Microwave band parabolic antenna commonly used, its feed generally is used for HE₁₁The corrugated horn of mould, feed-forward type parabolic antenna with 90 ° of corrugated horns after its efficient about 60%, the revised dual reflector antenna of rear feed type just can make efficient reach 75%, but its design and processing are all very complicated, the cost height is when being operated in HE₁₁And HE₁₂Two when mixing the mould corrugated horn, volume and weight is all big, influence is promoted the use of.

The objective of the invention is to design a kind of feed of high efficiency feed-forward type parabolic antenna.Be described in detail operation principle of the present invention and embodiment below in conjunction with accompanying drawing.

Fig. 1 is a structural representation of the present invention, and 2 is conical horns among the figure, the 3rd, and medium, it is fixedlyed connected with conical horn 2 with screw 4, and the shape in conical horn is conical hollow, is cylindrical in the outside of conical horn mouth.The 1st, the ring flange on the conical horn, the TE in the conical horn₁₁Mould motivates HE inmedium 3₁₁And HE₁₂Mould, adjust the diameter and the length ofmedium 3, can obtain the feed antenna pattern of crater shape, as shown in Figure 2, to upwarp partly be that the energy that the spatial diffusion decay of the low parabolic reflector that disappears causes reduces in both sides among Fig. 2, paraboloidal aperture field is evenly distributed, bore efficient improves, approaching-20 decibels of edge illumination, excessive anergy is very little, and the efficient that makes the feed-forward type parabolic antenna is increased to 0.75 from 0.6, compares with Behaviors of Corrugated Feeds commonly used, antenna gain improves 1 decibel, and it is equivalent to the reflecting surface diameter increases by 12%.

The size of Fig. 1medium 3, according to the ratio size decision of focal length/bore, embodiments of the invention are when the ratio of focal length/bore equals 0.38～0.40, φ₂=1 λ, φ₃=3.6 λ_ε, L₁=2.7 λ_ε, L₂=1.2 λ, wherein λ is a free space wavelength, λ_εBe the medium wavelength.A among Fig. 1₀Be circular waveguide radius, φ₁=2a₀It is the circular waveguide diameter.

Advantage of the present invention is that Design and manufacture is all very simple, and the two mould corrugated horns that mix that have same radiation characteristic with acquisition are compared, and its antenna weight can reduce by 3/4, cost 2/3.

Claims (2)

Translated fromChinese

1、一种工作于微波波段的用于抛物面天线的高效率馈源，其特征是在圆锥喇叭2的内部及其辐射口附近均放置有介质3，其内部介质形状是锥状空芯的，外部介质形状是圆柱体形的，内部和外部的介质是连为一体的同一种材料。1. A high-efficiency feed source for a parabolic antenna working in the microwave band, characterized in that a medium 3 is placed inside the conical horn 2 and near its radiation port, and the shape of the internal medium is conical hollow. The outer medium is cylindrical in shape, and the inner and outer mediums are of the same material that is joined together.2、按权利要求1所述的高效率馈源，其特征是介质3的尺寸由抛物面天线的焦距/口径（F/D）之比的大小决定。2. The high-efficiency feed according to claim 1, characterized in that the size of the medium 3 is determined by the ratio of the focal length/aperture (F/D) of the parabolic antenna.

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