Will a patch with very high er (80) bring the near field/far field boundary closer to the antenna by concentrating the radiated field more closely to itself?
Thank you
Why does antenna loading actually occur? In placing an object in the reactive near field the antenna resonance frequency shifts, but why? Is there a 'physical' connection (inductance/capacitance in the space between them) that causes the antenna to appear longer altering the resonance frequency...
Thank you Higgler and Biff44. You are right, the gain is about -40 dBi when implanted.
If antenna diameter constrains the NF, would spiraling even further through tighter curling effect the spatial distribution of the NF? I guess I am asking if there is a way to calculate the near field...
It's a 1/4 wavelength, spiral microstrip antenna. It is side fed and the substrate has an Er of 35.
The antenna is to work in the human body. I assumed that if the near field could be made as short as possible, loading effects of the human tissue would be minimal. Hence a large Er for...
Is there any way to minimise the length of the near field for a microstrip radiating at 403MHz. The strip is 1/4 lamda, and the substrate is Zirconia (Er=35). Thank you.
Best regards.
