antenna prolem related to yagi yuda or recmend me any other.

[saro]

yagi omega match

hi guys,
i need nec code for this problem.i need nec geometry of followig design antena.
i m using YAGI YUDA antenna for this prblem, but cant achive requirements.or you segest me good solution.
plz help me.

::
a high gain antenna designed to operate in the lowest UHF amature radio bands and should have following specification.


feed foint impidance 50 ohm
cain 8dbi
front to back ratio 15db
sidelob suppersassion 15db
::



regards
saro

 

[aboozar.hamidipoor]

omegamatch

if you have familiar with log-perodic antenna, I think log-periodic antennas could satisfy your problem. amonge log-perodic antenna LPDA and LPLA are better but I think you could also use LPTPA and LPTTA with smaller and thick arms for lower frequencies of UHF band.

 

[saro]

Re: antenna prolem related to yagi yuda or recmend me any ot

but how can achieve my requirement.tell me and pass me any help.

 

[scoppulal]

Re: antenna prolem related to yagi yuda or recmend me any ot

HI!
First of all I think that to obtain 50 ohm feed impedence you have to use some matching technique (beta match, omega match, ...) Don't forget to use a balun!!

For the other specs... it is hard to say... you can write a parametrized .nec file and do some testing.

I think that a 4 elements yagi could perform as you need.
You could try with DL6WU design (search the internet), I'm not sure that
4NEC2 or yagimax have some tools that will allow you to optimize your design for your specs.

BR

 

[plasma]

Re: antenna prolem related to yagi yuda or recmend me any ot

A few words on this subject.