Title :
Direct antenna modulation - a promise for ultra-wideband (UWB) transmitting
Author :
Yao, Weijun ; Wang, Yuanxun
Author_Institution :
Dept. of Electr. Eng., California Univ., USA
Abstract :
A novel antenna design concept is proposed based on antenna´s nonlinear transient responses. The essential idea is to integrate RF switches into a resonant antenna such as a patch antenna. Driven by modulating signals, the switches are able to shut off and turn on the antenna´s radiation slots directly. It is observed that narrow pulses can be generated and radiated this way. Thus, the patch antenna´s bandpass phenomenon, which limits the antenna´s bandwidth, can be overcomed. The experimental results show that a patch antenna with a resonate frequency 2.4 G and a 30 MHz bandwidth can transmit a digital modulated signal with beyond 400 MHz bandwidth.
Keywords :
antenna radiation patterns; broadband antennas; broadband networks; microstrip antennas; modulation; signal processing; transient response; transmitters; 2.4 GHz; 30 MHz; RF switches; UWB; conventional transmitter; digital modulated signal; direct antenna modulation; narrow pulses; nonlinear transient responses; patch antenna; radiation slots; resonant antenna design; resonate frequency; ultra-wideband transmission; Bandwidth; Patch antennas; Pulse generation; Radio frequency; Resonance; Slot antennas; Switches; Transmitting antennas; Ultra wideband antennas; Ultra wideband technology;
Conference_Titel :
Microwave Symposium Digest, 2004 IEEE MTT-S International
Print_ISBN :
0-7803-8331-1
DOI :
10.1109/MWSYM.2004.1339221
