The capability test of electronic tag
This paper introduces problems of electronic tag in actual application and the essentiality of capability test for electronic tag. We have established a test platform which is based on radio frequency and worked out some related schemes, which has laid the experimental foundations for further researching environmental influence factor in electronic tag in future.
On the read zone analysis of radio frequency identification systems with transponders oriented in arbitrary directions
One of the most important characteristics of a Radio Frequency IDentification (RFID) system is its "read zone", which is defined as the volume inside which the base station can communicate with the transponders (or, tags). This paper presents a systematic approach to analyzing the read zone of an RFID system where the base station antennas are a pair of switchable circularly polarized antennas and the transponder antennas are linearly-polarized and oriented in arbitrary directions.
Novel Coordinate System and Rotation Transformations for Antenna Applications
ABSTRACT General coordinate system transformations and rotation transformations for antenna, applications are presented in a novel coherent and unified fashion. In coordinate system transformations, the Cartesian transformation matrix (CTM) is used to relate the representations of a vector in two Cartesian coordinate systems. Useful CTMs such as the Cartesian–spherical transformation and the Eulerian transformation are formulated based on three elementary CTMs. In rotation transformations, the rotation transformation matrix (RTM) is used to describe the rotation of an object, which may be a point, a vector, a coordinate system, or any physical entity. The relationship between the representations of an RTM in different Cartesian coordinate systems art: developed. Three examples: (i) Scanning dual–reflector antennas, (ii) Map generation for satellite antennas, and (iii) Coordinate systems for antenna measurement (EL–over–AZ and AZ–OVER–EL) are given to demonstrate the versatility of the combined application...