8Polenz C M,Ta~uo Itoh.A Microwave Noncontact Identification Transponder using Subharmonic Interrogation[J].IEEE Trans on Microwave Theory and Tech,1995,43(7):1673-1679.
10Montiel C M,Fan Lu,Chang Jai.A Novel Active Antenna with Serf-Mixing and Wide-band Varactor-Tuning Capabilities for Communication and Vehicle Identification[J].IEEE Trans on Microwave Theory and Techniques,1996(12):2421-2430.