Is there any standard procedure or rule to determine design dimensions at miniaturized antennas at lower frequencies like 915MHz or 2.45MHz?
If you are going to model it you will need to include the near-field region. Conductive or dielectric loss in the near electric field will be significant.
If you want to find out about how small antennas behave, read about Electrically Small Antennas, and particularly Wheeler, and Chu.
In air best efficiency is with magnetic materials in the antenna, but this may not be so when the outside is surrounded by lossy dielectric (tissue) so it may be best to have all the electrical energy stored for example in a capacitor in the antenna which may keep the electric fields in the near-field lower.
Consideration must be given to the materials around the antenna which may affect the radiation pattern. For 915 MHz you have to look for RFID systems.
Thanks sir for your quick reply. I appreciate your answer. Can you please calculate radiation box dimensions if we are using PDMS biocompatible material with permittivity =2.7, thickness =0.2 mm and loss tangent =0.02
Dear Atul Varshney
Set the radiation box dimensions at a distance of lambda/4 from every side of the antenna. For more details, please read the attached communication
Conference Paper A Compact Design for Dual-band Implantable Antenna Applications
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