Design of Microstrip Antennas for 2.45 GHz on Different Substrates

This paper present designs of inset feeding rectangular microstrip antennas on different substrates with different dielectric constants (FR4 laminate, Green Tape (TM) 951 LTCC from DuPont and RT/duroid 6010LM from Rogers Corporation). All of antennas were designed for 2.45 GHz frequency band that is one of the most common frequency band for modern wireless communication (WiFi or Bluetooth). Antennas were simulated and results were realized from antenna miniaturization point of view. For antenna miniaturization were used substrates with higher dielectric constant (er) at approximately similar substrate thickness. CST Microwave Studio was used for design and optimization of antennas. As a result of our simulations, we find that with an increase of er the antenna area will be reduced but at the detriment of the reduction of the bandwidth at -10 dB. It is possible to eliminate this problem with the increase of the thickness of the substrate. In this way it is possible to achieve required miniaturization while maintaining the possibility of using this antenna in the WiFi area.