3 edition of Antenna pattern control using impedance surfaces found in the catalog.
Shipping list no.: 92-2227-M.Microfiche. [Washington, D.C. : National Aeronautics and Space Administration, 1992] 1 microfiche.
|Statement||National Aeronautics and Space Administration, AVRADA Joint Research Program Office, Langley Research Center|
|Publishers||National Aeronautics and Space Administration, AVRADA Joint Research Program Office, Langley Research Center|
|The Physical Object|
|Pagination||xvi, 140 p. :|
|Number of Pages||66|
|2||NASA contractor report -- NASA CR-190218.|
nodata File Size: 5MB.
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The aperture has been realized by modulated grain of rice elements and a detail of the feeding point is also shown in Fig.
And it is necessary to know the impedance of the point where the transmission line is to be connected. This is so because now there will be some current Antenna pattern control using impedance surfaces the nearby active elements that will lead to cause the mutual inductance.
This is so because an antenna can be either transmitting or receiving one. For this reason, placing a 4:1 balun in the line may be a poor choice for converting the balanced line to a single-ended or unbalanced line. Overall, the complete synthesis part is extremely fast from few minutes to one hour, depending on PC speed and dimension of the antenna. The closer the feedpoint impedance is to the line's characteristic impedance, the less radical will be the transformation of resistance and reactance.
It pays to have a small calculation program to assist in finding and visualizing the data. We can suspend non-conductive rings slices of PVC or similar from limbs and posts to support the line on its way to the antenna. The other condition that would allow the feedpoint impedance to reappear is an exact match between the feedpoint impedance and the characteristic impedance of the cable.
We can arrive at some answers by using a program like TLW. Here, we have briefly summarized the design process and we have provided several new examples of MTS antenna designs. Metasurface MTS antenna design has sprung up and significantly evolved during the last ten years, becoming a significant innovation in the field.
For example, a dipole concentrates the signal into two lobes. How you orient a center-fed doublet depends on understanding both the elevation and the azimuth patterns for the wire. Outdoor supports can be of two general types: rings or clamps. and Liu, Kefeng Unspecified Center NAG1-1183. The missing bands would show elevation angles of maximum radiation that are part way between the bands in the illustration.
Suppose that we connect a typical coaxial cable to the feedpoint and use 100' of the line to reach the shack.
:V 12 represents the voltage in circuit 1 due to current in circuit 2.
In high-volume applications, you could even get a special antenna designed.