I need a source (factory or company) which provides materials with high epsilon r in different shapes. Epsilon r >= 10.
Also want to know, do those who are working on DRA actually buy the material or do they build them by themselves?
Hi Ali,
I have mixed my own composite and made my own DRAs. However, there are lots of sources that you can ask for the materials, and then you can fabricate your DRAs in a shop.
Which permittivity are you looking for? Sigma-Aldrich is a well known provider of materials that you perhaps can find useful. But it really depends on what permittivity you are looking for.
My personal suggestion is not to look for very high permittivities since they are usually made of ceramics, and therefore very hard to fabricate. It also depends on your actual shape. If it's the normal cylindrical or rectangular shapes, it would be much easier to build.
Hope these help you.
Hi Matt
Thanks alot for your reply.
Well actually my project is about investigating DRA for radar system at L,S and C bands. Therefore, if i would be about to build an array, size of each individual DRA block matters, and since i've read in papers, size of antenna is inversely proportional to epsilon r that's why i am looking for high permittivity. However, i was thinking of using glass, where is easy to find and is much easier to to fabricate compare to ceramic, but it's permittivity is around 7-8 only. But, if you have any better suggestions or if you think i'm on the wrong path, i'd like to hear from you. And also about shape, as i got to know working with cylindrical is more convenient due to obtaining desire mode, but rectangular shape is easier to build. So what's your opinion on this?
And if you would help me or give me a good source for propagation mode and exciting methods that'd be very helpful.
I'm really grateful.
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