Title :
A compact broad-band helical antenna with two-wire helix
Author :
Noguchi, Keisuke ; Betsudan, Shin-ichi ; Katagi, Takashi ; Mizusawa, Motoo
Author_Institution :
Div. of Electr. Eng., Kanazawa Inst. of Technol., Ishikawa, Japan
fDate :
9/1/2003 12:00:00 AM
Abstract :
A new method of increasing the bandwidth of normal-mode helical antennas (NMHA) is proposed. The antenna has length of around 0.1 of the target wavelength, and consists of a helix constructed with two flat wire strips. The method exploits the two current modes of the two-wire design to obtain wideband response. Based on an analysis of the equivalent circuits of the two modes and subsequent optimization of design parameters, a final two-strip NMHA design is proposed that is demonstrated to have a bandwidth of 12% in the 760-MHz band at a voltage standing wave ratio of less than 2.
Keywords :
antenna radiation patterns; broadband antennas; equivalent circuits; helical antennas; optimisation; 760 MHz; compact broadband antenna; current modes; equivalent circuits; normal-mode helical antennas; optimization; small antennas; two-strip NMHA design; two-wire helix; voltage standing wave ratio; wideband response; Antenna radiation patterns; Bandwidth; Broadband antennas; Current distribution; Dipole antennas; Equivalent circuits; Helical antennas; Impedance; Transceivers; Wires;
Journal_Title :
Antennas and Propagation, IEEE Transactions on
DOI :
10.1109/TAP.2003.816358
