Title :
Radiating beyond the bandwidth using direct antenna modulation
Author :
Yao, Weijun ; Wang, Yuanxun Ethan
Author_Institution :
Dept. of Electr. Eng., California Univ., Los Angeles, CA, USA
Abstract :
A broadband transmitter design concept is proposed based on an antenna´s nonlinear transient responses when integrated with switching devices. The switches are placed on special locations on the anttenna so that they are able to shut off and turn on the antenna´s radiation slots in real time to produce the radiation of narrow pulses. The resonant antenna´s bandpass phenomenon, which limits the antenna´s bandwidth and further the system bandwidth, can be overcome. Experimental results show that a patch antenna with a resonant frequency of 2.4 GHz and a 30 MHz bandwidth can transmit a digital modulated signal with more than 400 MHz bandwidth.
Keywords :
UHF antennas; broadband antennas; microstrip antennas; pulse modulation; slot antennas; transient response; 2.4 GHz; 30 MHz; antenna radiation slots; broadband transmitter design concept; digital modulated signal; direct antenna modulation; narrow pulses; nonlinear transient response; resonant antenna bandpass phenomenon; resonant frequency; switching devices; Bandwidth; Broadband antennas; Digital modulation; Patch antennas; Resonance; Resonant frequency; Slot antennas; Switches; Transmitters; Transmitting antennas;
Conference_Titel :
Antennas and Propagation Society International Symposium, 2004. IEEE
Print_ISBN :
0-7803-8302-8
DOI :
10.1109/APS.2004.1329789
