Title :
Theoretical bandwidth of folded small antennas
Author :
Noguchi, Keisuke ; Makino, Shigeru ; Hirota, Tetsuo ; Itoh, Kenji ; Betsudan, Shin-ichi
Author_Institution :
Div. of Electr. Eng., Kanazawa Inst. of Technol., Nonoichi, Japan
Abstract :
Theoretical maximum bandwidth is derived for an equivalent circuit of small antennas consisting of a folded structure. Based on the equivalent circuit, input admittance as a function of frequency deviation is derived. Under the conditions of double resonance characteristics, the maximum bandwidth and characteristic impedance in balance mode are expressed with relation of the allowable VSWR and Q. As an example of design, a folded inverted-L antenna is presented.
Keywords :
antennas; double resonance characteristics; folded inverted-L antenna; folded small antennas; frequency deviation; input admittance; theoretical maximum bandwidth; Admittance; Antenna theory; Bandwidth; Dipole antennas; Equivalent circuits; Helical antennas; Impedance;
Conference_Titel :
Antennas and Propagation Society International Symposium (APSURSI), 2013 IEEE
Conference_Location :
Orlando, FL
Print_ISBN :
978-1-4673-5315-1
DOI :
10.1109/APS.2013.6711042
