Title :
Electrically small, circular inverted-F antenna based on a robust, minimal design space
Author :
Kakoyiannis, Constantine G. ; Constantinou, Philip
Author_Institution :
Mobile Radio Commun. Lab., Nat. Tech. Univ. of Athens, Athens, Greece
Abstract :
A printed circular inverted-F antenna (CIFA) is mirrored against a small, crescent-like ground plane (GNDP). The whole radiator is printed on a discoid substrate that conforms to the element and the ground plane. The edge of the PCB conforms to the circumscribing sphere. The CIFA-plus-GNDP combination is an electrically small element designed with only three parameters: two angles and a radius. It is resonant and matched at 2.5 GHz, where it achieved a 3.5% fractional impedance bandwidth. The antenna is highly efficient (91-95%) and approaches Thal´s limit on minimum Q-factor within 27%.
Keywords :
Q-factor; microstrip antennas; printed circuits; CIFA-plus-GNDP combination; PCB; Thal limit; crescent-like ground plane; discoid substrate; efficiency 91 percent to 95 percent; electrically small element; fractional impedance bandwidth; frequency 2.5 GHz; minimal design space; minimum Q-factor; printed circuit board; printed circular inverted-F antenna; Bandwidth; Microstrip; Mobile antennas; Substrates; Wireless communication; Wireless sensor networks; Microstrip antennas; mobile antennas; small antennas; wireless sensor networks;
Conference_Titel :
Microwave Conference (EuMC), 2012 42nd European
Print_ISBN :
978-1-4673-2215-7
Electronic_ISBN :
978-2-87487-026-2
