i wanted to know the dimensions of air box i should use in my antenna. it has a cylindrical substrate Neltec NY9217 having radius 150mm height 3.175mm and using coax feed. for a frequency range 12 to 13 GHz.
One typically wants a minimum of a quarter wavelength of free space (at the lowest frequency) between the edge of the simulated object and the radiation boundary.
ya...but is it different in case of coax feed? i have seen the patch antenna example in hfss help and i found it to be different. Moreover, my antenna is 300x300 mm^2 in dimension and according to the quarter wavelength factor the radiation boundary is coming out to be just 6.25mm above the simulated object. so is it alright?
could u tell me the meaning of focusing plane? it is given that height of focusing plane is 150mm. Does it means i have to keep air box 150mm above the substrate?
usually big airbox is used if you want to monitor spatial diversity of waves in E-Field. I am not sure about bessel beam if these require a height of 150mm. like 4-6 times lambda.Regards,