What absorber material is suitable for the reflector antenna to reduce back lobe level? I would appreciate any suggestion and comments.
To answer that question I would need mor information of what the "reflector antenna" looks like...
احتاج الى معرفة كامله بالموضوع لكي استطيع الاجابة على سؤالك بصورة علمية
Thanks for your response,
A conventional method to reduce side lobe (or back lobe) level of the reflector antenna is to use an absorber layer on rim of the reflector. I have modeled a reflector antenna with absorber layer in CST software. MLFMM or MOM was chosen as solver method But lower side lobe level didn't observed. Absorber layer is validated by unit-cell simulation and high absorption rate was observed also for high angular incident angle. I am a little confused in the investigation of the simulation results. I would appreciate any comment from anyone who has experience in the same field with HFSS or CST.
best regards,
Well, side lobe cancelation was studied due to the dominating procedure in a paper, that procedure based on the next, the form or the shape distributed electric far from observation point or dominating region must be provided, in the other hand that field should equal the total electric that radiated from auxiliary sources for example, so it can weighting array elements. Notes that form of electric field real and imaginary parts is preferable to converting it to a polynomial form by the cftool in MATLAB and deeling with augmented matrix.
dear Eanass,
I guess your recommendation are related to the phased array antennas. But my question is clearly about absorbers used in reflector (parabolic) antennas. Cad geometry of my problem is depicted in attached picture.
I know, If you want, cancel from the desire field the rseduial taper by absobation. But no one can expect the difficulty behind such objective, good luck, and l dont have anything more.
You will need absorber designed to operate at the frequency you are using, and at the oblique incidence that it hits the absorber with when it arrives from the feed. A Jaumann absorber or Salisbury screen absorber may work, tuned for the right frequency band and incidence angle. If you want a large frequency range then you will need thicker absorber that isn't resonant.
Check for off-normal performance as it will be different to normal incidence.
see https://www.laird.com/products/microwave-absorbers/microwave-absorbing-foams/eccosorb-an
https://en.wikipedia.org/wiki/Radiation-absorbent_material
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