Design Of Integrated Antennas Using FDTD

In this paper, research and design of Integrated Antennas have been done using finite-difference time-domain (FDTD) algorithm. In recent years, with the development and maturity of Microwave Integrated Circuits (MIC) and Monolithic Microwave Integrated Circuits (MMIC), Integrated Antennas using microstrip structure have attracted great attention.Fundamental principle of FDTD and basic knowledge of Integrated Antennas design are introduced in this paper at first, then research and design of Radio Frequency Identification (RFID) antenna and Integrated-circuit package antenna (ICPA) have been done.Radio Frequency Identification (RFID) is also called electronical tags. RFID antennas are the data interchanged bridges between electronical tags and readers, they are used to receive the RF energy and information of electronical tags, and send the correlative information. Far distance electronical tags on 860MHz-960 MHz of UHF are the emphases of currently research, and one of the biggest challenges in RFID antennas design is tagging objects that consist of metal material. So research and design on 915MHz passive RFID antennas of metal objects have been done in this paper. The design of L-shape slotted Planar Inverted-F Antenna (PIFA) of 915 MHz passive RFID antenna, has the characters of small volume, low-cost, omnidirectional directivity in radiation pattern and tagging objects can consist of metal, the design satisfies the rules of UHF RFID antennas.Integrated-circuit package antenna (ICPA) for highly integrated wireless transceivers, which combines a microstrip patch antenna with an RF transceiver into a single package, and minimizes the electromagnetic interference between them, is required to operate on dual-frequency at 2.4 and 5.25 GHz. Through simulation, analysis and optimization of the H-shape slotted ICPA, this paper presents the design of a U-shape ICPA, short pins and planar capacitive patch are also used in the design. Compared with the previously work of H-shape ICPA, the U-shape ICPA has smaller volume and bandwidth is doubled according to the FDTD simulation results. The novelty design of U-shape ICPA will become a new possible form of dual-frequency ICPA.