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Admin
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Everything posted by Admin
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,,,OKAY...!!!! ,,, BUT NOW I WORK ON THIS ... !!!
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Polystyrene foam can be found on all roads, even in garbage...!! If you do not want polyurethane foam spacers you can put two spacer screws but you need other dimensions ,,,for SMA 75 Ohm, you need another distance between vibrator and reflector, but this is not important, you must to try ... !!!
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,,, okay, if you put in place of rectangular patches, elliptical patches, like, what do you say ... ???
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,,,no,something like this...
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,,,no,I want just a drawing...!!!
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,,, clanon, you, can post its technical drawing...??? I am most interested in the transmission lines .. !!!
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okay, tomorrow you will have the simulation results ... !!! But why don't you try and this simple antenna....???
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I use the dielectric constant = 1.2
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,,, or maybe you want this...!!!
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,,,it"s good 0.8 mm galvanized iron...!!! You have to wait a little, because I now work on this antenna..!!!
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,,,Clanon, air antenna, other dimensions are required...!!!
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,,, welcome Vitaliy ... !! ,,, I will try to help you ... !!!! ,,, so, do you like ... ???
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,, yes, I know it... long ago...!!! ,,, this antenna is very complicated to execute on the PCB and for so many patches, the gain is very small..!!!! The patches should have a simpler geometry...!!! ,,, this variant in the air, is more interesting but with simpler patches...!!!
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,,, it would be interesting to see the adaptation of this antenna to the 75 Ohm cable...!!! I believe that the crossed-dipole, is built on double plated PCB
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These are the details... AX 2513.cst
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I am very busy these days, but in the yard, I will solve this problem..!!!
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,,, vars-cat, these are the results...!!!
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,,,thats for 3G 2025Mhz...!!!
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,,, if you do not understand something, ask me ... !!!!
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,,,, good, and then in what sense do you want me to optimize this antenna...????
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I'll try, my friend....!!! But, however, the frequency range is very large...350 MHz....???!!!
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,,, yes, it might, it must be tried ... !!!
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,,, I repeat, it seems that the adjustment on the frequency range,VSWR or impedance is made by rotating the first director...
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When a transmission line is terminated with impedance, ZL that is not equal to the characteristic impedance of the transmission line, ZO, not all of the incident power is absorbed by the termination. Some of the power is reflected back to the source so that phase addition and subtraction of the incident waves creates a voltage standing wave pattern on the transmission line. The ratio of the maximum to minimum voltage where the successive maxima and minima are spaced by 180˚ (λ/2) is known as the voltage standing wave ratio (VSWR).
