TW575980B - Reflector antenna edge design with feed-horn equi-illumination pattern - Google Patents

Description

575980

Detailed description of the surface type ;; energy distribution field shape design of the feeder and other reflections; the energy source field design of the feeder can cut off part of the reflection surface area of the feed; Designed to be used in high-gain radar microwave systems, its basic design is around =; =: fabrication relationship, and the antenna appearance is more square. Therefore, the energy of the antenna part is: =! Transmitter = low distribution, and the edge of the reflecting surface is shown in the center. The antenna ’s antenna is designed so that the side wave is discerned. After testing the electrical specifications, the area of the display line is sufficient. Although the Tianhe She ® does not function as it should, overall the feeder feeds to efficien cloth efficiency (aPertUre ⑽ to order distribution eiriciency) μ φ ^ r. ,, 〆, / spill value value) is not ideal. Its appearance is mostly related to the structure. Its peripheral edge is slightly different from the intensity distribution of the feed, so that when the reflection surface is completed, it does not match the field-shaped energy distribution of the feeder, and the effect of antennaization. To solve the above-mentioned shortcomings, take the "King Wang". The method and features of the present invention will be explained below. After the antenna specifications are set, the relationship between the reflective surface and the feeder can be designed. Obtained through analysis or testing. The hair

Page 4 575980

The energy distribution field shape design of the antenna on the edge of the clear reflector is designed according to the energy distribution curve of the feeder and so on. The outside of the reflector will not need to be cut away, which can reduce the antenna volume and weight and achieve the best energy distribution efficiency on the reflector. effect. One of the characteristics is to surround the edge. When designing a search radar antenna to meet the needs, when the antenna specifications are set, the relationship between the reflective surface and the feeder 'the horizontal axis of the feeder to the reflective surface [about 144 degrees, the vertical axis covers about 35 degrees. Calculating the feeder 3]) The isoform of the field shape is approximately ellipse. Generally, the energy distribution of the edge of the reflective surface antenna is about -15db. The wide-shaped design of the energy distribution of the reflective surface antenna of the present invention uses a feeder and the like. Another feature is that after the fixed relationship between the reflective surface and the feeder structure, the ζ center frequency is -12db with the same energy distribution. The curve is projected on the anti-ejection surface according to the relevant position, and the perimeter of the reflective surface is according to the energy distribution curve such as -12db, which covers the design and production. Due to the specification requirements, the reflecting surface is a cylindrical paraboloid, and the longitudinal surface is a straight-faced feeder. After the energy is reflected by the reflecting surface, part of the electromagnetic waves will be shielded by the feeder and the transmission line. Therefore, the feeder for the edge of the reflective surface antenna of the present invention ^ Another feature of the energy distribution field shape design is that the feeder is tilted upwards, also l = μ 2 alpha clock, for example, tilted 10 degrees upwards, and the reflection tilted downwards, such as 5 degrees, (become ^ 36 ± reflector) in order to shield The effect is reduced. The energy distribution field design of the reflector for the edge of the reflective surface antenna of the present invention is another. The characteristic is that the energy distribution curve of the feeder is about -12 db and the corresponding to the &

575980 5. The scope of the description of the invention (3). According to this perimeter, the outer surface of the carbon fiber reflective surface is designed and manufactured. The unequal energy distribution (-lldb to Odb) curve of the feeder can be displayed from the reflective surface coordinates. The edge of the reflective surface antenna of the present invention. The advantages of using energy distribution field shape design such as feeder can be used to search the radar antenna field shape using physical optics analysis. After iso energy distribution curve is made, the cut-off area of the periphery will be about 28%, and its reflection surface energy distribution efficiency will increase from about 41%. To 48 · 5%, the overflow value increased from 13.2% to 14 · 5%. 〇 In the above method, there is not much distance. The anti-main flap change application will search for the test value, and the appearance is used. Invented reflective surface, the reflective surface, etc. have different specifications of the external surface cut, such as very small. Invented reflective surface Radar reflective surface not only meets the beauty of the line. The energy distribution of the antennas such as the feeder at the edge of the antenna # The energy distribution varies from the feeder to the reflective surface, but its energy distribution is divided by the difference in distance from the front and the cut after the field shape theory # Gain, horizontal beam width, vertical beam antenna edge After the antenna is partially cut off with the feeder and other energy, all the electrical specifications of the completed antenna are required. The radar reflective surface antenna has been designed in the same field shape, and its width and side are not displayed due to changes in position. Electrical verification of wave field shape design

575980 Brief description of the drawings The following illustrates the design of energy distribution fields such as the feeder for the edge of the reflective surface antenna of the present invention. Figure 1a is the H-p lane field shape calculated by the traditional feeder. Figure 1b is the E-plane field shape calculated by the traditional feeder. Figure 1c is the 3D field shape calculated by the traditional feeder. Figure 1d shows the energy distribution calculated by the traditional feeder. Figure 2a is the vertical vector energy distribution diagram of the incident reflecting surface of the feeder. Figure 2b is the horizontal vector energy distribution of the incident reflecting surface of the feeder. Figure 2c is a side view of the energy distribution of the incident reflecting surface of the feeder.

Figure 2d is a perspective view of the energy distribution of the incident reflecting surface of the feeder. Figure 3a shows the analysis of the horizontal field shape before the radar antenna is cut. Figure 3b shows the horizontal field shape analysis value after the radar antenna is cut. Figure 3c shows the analysis of the vertical field shape before the radar antenna is cut. Figure 3d shows the analysis of the vertical field shape after the radar antenna is cut. Figure 3e shows the 3D field shape before the radar antenna is cut. Figure 3f shows the 3D field shape of the searched radar antenna. Figure 4a is the horizontal field shape test value after the radar antenna is cut. Figure 4b is the vertical field shape test value after the radar antenna is cut.

Figure 5a is a perspective view of a reflective radar antenna with an energy distribution field design such as a feeder for the edge of a reflective antenna of the present invention. Fig. 5b shows the system verification of a reflective radar antenna with an energy distribution field design such as a feeder for the edge of the reflective antenna of the present invention. Figures 1a, 1b, 1c, and 1d illustrate the conventional conventional feeders, respectively

Page 7 575980 Schematic description of the calculated H-plane, E-plane, 3D field shape and energy cycle diagram. Figures 2a and 2b illustrate the vertical and horizontal vector energy distribution diagrams of the incident reflecting surface of the feeder, respectively. Figures 2c and 2d are side and perspective views illustrating the energy distribution of the incident reflecting surface of the feeder, respectively. Figures 3a and 3b show the horizontal field shape analysis values of the search radar antenna before and after cutting, respectively. The electrical specifications before and after the cutting have little change. Figures 3c and 3d show the vertical field shape analysis values of the search radar antenna before and after cutting, respectively. The electrical specifications before and after the cutting have very little change. Figures 3e and 3f show the 3D field shape of the search radar antenna before and after cutting, respectively. ° Figure 4a shows the horizontal field shape test value of the search radar antenna after cutting. Its gain, beam width, and side lobe are very small. Figure 4b shows the vertical variation of the search radar antenna after cutting, its gain, beam width and side lobe are very small. Fig. 5a is a perspective view illustrating a reflective surface radar antenna having an eight-field layout design such as a feeder for the edge of the reflective surface antenna of the present invention. ° i The figure shows the system verification of the reflective surface radar antenna designed with energy-distribution such as the feeder for the edge of the reflective surface antenna of the present invention. It can be understood that the field-shaped design of the feeder such as the feeder for the edge of the reflective surface of the present invention is designed according to the energy distribution curve of the feeder and the like. The outer edge of the transmitting surface can be cut away. , While achieving the most efficient energy distribution on the reflecting surface = line

Page 8 575980

Claims (1)

575980 _Case No. 911milk 891 _ June 6, application for patent scope 1. A design method of the edge of the reflective surface antenna, using the energy distribution field design of the feeder, etc., that is, the peripheral edge of the reflective surface is made according to the energy distribution curve design of the feeder. And remove the unnecessary part outside the perimeter of the reflecting surface. The design and manufacturing steps include: 1) adjusting the feeder to tilt upward at an angle, and adjusting the reflecting surface to tilt downward at an angle to make its structural relationship After fixing, 2) project the center frequency -12db with the energy distribution curve to the reflecting surface according to the relevant position, 3) design and make the reflecting surface perimeter according to the range of the energy distribution curve such as -12db in step 2). 2. According to the 5th and 6th method of the antenna edge of the reflective surface according to item 1 of the scope of the patent application, wherein the feeder is tilted upward, for example, 10 degrees upward, and the reflective surface is tilted downward, for example, downward Inclined 5 degrees to become an offset reflector to reduce its shadowing effect. 3. According to the design method of the edge of the reflective surface antenna according to item 1 of the scope of patent application, the unequal energy distribution (-11 (11) to Odb) curve of the feeder can be displayed by the reflective surface coordinates. 4 · According to the design method of the edge of the reflective surface antenna according to item 1 of the scope of the patent application, which can be removed by the iso-energy distribution curve, the peripheral area can be removed by about 28%, and the energy distribution efficiency of the reflective surface is about 575980 _Case No. 91135891_ Year, Month, Date, Amendment 6. The scope of patent application increased from 41% to 48.5%, and the overflow value increased from 13.2% to 14.5%. Page 11