The National Natural Science Foundation of China(No.60621002);the National High Technology Research and Development Program of China(863 Program)(No.2009AA011801)
An RF transceiver composed of a zero-IF receiver and a direct up-conversion transmitter for cognitive radio applications is presented. The adjustable channel filter array in the receiver is used to suppress adjacent c...
The National Natural Science Foundation of China(No.60621002,60702027,60921063);the National Basic Research Program of China(973Program)(No.2010CB327400);the National High Technology Research and Development Program of China(863Program)(No.2008ZX03005-001,2008AA01Z223,2009AA011503)
A novel dual-band planar microstrip filter using parallel coupled microstrip lines and open-loop stepped-impedance resonators(SIRs)loaded with two shunt open stubs is presented.By tuning the physical lengths of open...
Supported by the National High-Tech Project (No. 2009AA011801);National Natural Science Foundation of China (No. 60621002)
This paper presents an RF receiver of zero-Intermediate Frequency(IF) architecture for Cognitive Radio(CR) communication systems.Zero-IF architecture reduce the image reject filter and IF filter,so it is excellent in ...
supported in part by the Natural Science Foundation of Jiangsu Province (BK2008031);National Basic Research Program of China (2004CB719802);"111" Project (111-2-05);National Natural Science Foundation of China (60871016,60671015,and 60621002)
We present a Luneberg-like cylindrical lens antenna experimentally using metamaterials.The cylindrical lens antenna with a broad bandwidth is made up of the non-resonant I-shaped metamaterial structures.The near-field...