a little question for u a huge solution for me:)
I am supposed to design a microstrip meander line antenna but I dont know how to determine here in uploaded figure s d and l parameters for vertical polarization and the angle of the radiation pattern is lets say 30 degree(but I dont know that either).the antenna will work @2.5 ghz and will be in fr4 Er=4.5 and thickness of substrate is 1.5 mm if necessary
and beside that if you want to share other important points or experiences about microstrip meander line antenna be my guest plz:)
hope you help me
thanks for everything
Is it an antenna ? I don't think so..
I hardly believe you are serious by asking that coz this my antenna thesis. is there any chance that u dont understand what we got here?
I didn't exactly understand how this "terminated" structure will radiate ? What it will have radiation impedance while it's terminated as a transmission line ?
Agree with BigBoss, it looks more like a transmission line with an end-termination. It is the opposite to an antenna, as a ideal transmission line do not radiate.
Never seen an antenna with a terminator before. Generally free space is the terminator... 377 ohms.
ok I tried to upload our point of start as an attachment.
Interesting..
It creates phase shifts and consequently traveling wave on it by connecting series varicaps..
Traveling wave is radiated in such a way by small discrete antennas...
Is practically it applicable ? I guess no...
Agree with BigBoss, again. It is a transmission line. A bit ineffective TL and worse if it is called antenna. 10 degree beam steering is either not very impressing compared to other methods.
Do a minor redesign so it can be an electrical controlled delay line(LCLCLC..) with an integrated dipole or monopole array. Let L be a part of each antenna element. You will achieve same thing but much more effective from radiation view and resulting in a much more steerable lobe.
Guess you know that varactor diodes cause big problem if used in a tuned antenna arrangement for TX, due to that RF voltage will be a part of varactor biasing.
Terminating resistors are used for many years in some antenna types, mostly Beverage Wire Antennas.
Generally the antennas using termination resistors are long, at least one wavelength, and the value of the resistor need to be tuned (and not in the other way, to tune the antenna function of the terminating resistor).
Was proven by measurements that the terminating resistor helps only to improve the VSWR of the antenna, and not its radiation.
ok thanks for your shares. In fact I dont know very much about antennas actually its the first semester we met. And I dont think I liked it.
anyway lets say I wont terminate the antenna. but again does anyone know about how will I gonna calculate the s d and l parameters?
E kafeman this is my thesis so first thing is first:) in a microstrip Meander-line antenna with an open end what should be the and why?
Beverage wire antennas is a bit same idea, and in both cases is termination needed due to that it is a traveling wave, and without resistor will reflections ruin radiation pattern.
Also Beverage wire antennas can have a steerable beam: NASWA Journal Columns · Technical Topics, April 1997.
Reminds me a bit about that I in younger days did use telegraph lines and railroad tracks as antennas for VLF experiments.