Title :
A low frequency spiral C-patch antenna design for automotive application
Author :
Liang, M.C. ; Huang, K.C. ; Lo, M.L.
Author_Institution :
Dept. of Electr. Eng., Nat. Univ. of KaoHsiung, Taiwan
Abstract :
A spiral shape C-patch antenna is presented. A slot between the feed and ground plane is used as an equivalent capacitor for the C-patch antenna. By controlling the size of the slot, the loaded capacitance can be changed. A high gain antenna of size less than 8 cm × 8 cm that operates at 174 MHz is needed for automotive applications. A spiral C-patch antenna is used for this design. The original operating frequency of the spiral C-patch antenna is 420 MHz. By introducing the slot between the feed structure and the ground plane, the operating frequency of the spiral C-patch can be reduced to 170 MHz or less. The gain and efficiency of the antenna is qualitatively assessed using communication quality and radiated power. By experiment, the efficiency of this spiral C-patch antenna is shown to be much higher than a 45 cm commercial dipole antenna.
Keywords :
VHF antennas; antenna feeds; microstrip antennas; mobile antennas; spiral antennas; 174 MHz; 420 MHz; antenna efficiency; antenna feed structure; antenna gain; automotive application; commercial dipole antenna; communication quality; equivalent capacitor; ground plane; loaded capacitance; radiated power; spiral C-patch antenna; spiral antenna; Antenna feeds; Automotive applications; Capacitance; Capacitors; Dipole antennas; Frequency; Shape; Size control; Slot antennas; Spirals;
Conference_Titel :
Antennas and Propagation Society International Symposium, 2004. IEEE
Print_ISBN :
0-7803-8302-8
DOI :
10.1109/APS.2004.1329859
