Abstract
A newly developed AVI transponder is to be used in Automatic Vehicle Identification (AVI) system, which provides identification of moving vehicles passing by a certain location, as to its registration number, and classification etc. This AVI system is characterized by the fact that it utilizes ceramic resonators in the composition of a transponder identification code, and a single microwave carrier to convey an interrogation signal to, and a response signal from, that transponder.The transponder is a completely passive device free of any power supply, and operates as a “Reflector”. Overall external dimensions of transponder are 7 × 10 × 1 cm with a weight of 150 grams, the unit is compact, light weight and can be mounted easily on the vehicle, and is easy to carry.All of the circuitry required for the transponder is provided in the form of microstrip lines utilizing MIC (Microwave Integrated Circuit) technology on the PTFE-glass fibre laminate substrate. The transponder circuitry, which consists of printed antenna, microwave modem circuit and medium frequency circuit, is patterned on both surfaces of the single substrate. In this paper, operation principle, circuitry and construction of the transponder will be described.
Highlights
In recent years, in step with the significant progress of highway and railroad transportation systems, high speed and high volume of traffic has become the general trend
All of the circuitry required for the transponder is provided in the form of microstrip lines utilizing MIC (Microwave Integrated Circuit) technology mounted on the antenna substrate
The AVI transponder described in this paper is characterized by no-battery operation and simple construction which based on its unique operation principle, and by small light weight, and compactness which are realized by use of MIC (Microwave Integrated Circuit) and HIC (Hybrid Integrated Circuit) technology
Summary
In step with the significant progress of highway and railroad transportation systems, high speed and high volume of traffic has become the general trend. Another drawback lies in the short distance of several decimeters, permissible between the road-side loop antenna and the transponder’s loop Such drawbacks have practically precluded application of electromagnetic systems, in the identification of automotive vehicles and containers in motion. The newly developed microwave AVI system is characterized by the transponder This new transponder has the advantages that it is a completely passive device, small in size, of flat construction, light in weight, and has a considerably long operation range from the interrogator antenna. This has enabled the transponder to provide an ideal system for the identification of automotive vehicles, rail cars and containers
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