Multilayer Strip Dipole Antenna Using Stacking Technique and Its Application for Curved Surface

Abstract

This paper presents the design of multilayer strip dipole antenna by stacking a flexible copper-clad laminate utilized for curved surface on the cylindrical objects. The designed antenna will reduce the effects of curving based on relative lengths that are changed in each stacking flexible copper-clad laminate layer. Curving is different from each layer of the antenna, so the resonance frequency that resulted from an extended antenna provides better frequency response stability compared to modern antenna when it is curved or attached to cylindrical objects. The frequency of multilayer antenna is designed at 920 MHz for UHF RFID applications.

Impedance improvement with curved multilayer Strip Dipole antenna for RFID tag

“…A folded balun or quarter-wave coaxial balun is relatively easily constructed [10]. We connected an SMA connector to this balun and curved the antenna on different diameters of expanded polystyrene (EPS) foam for measurement, as shown in Figure 5b-d [5]. The balun is not part of the strip dipole antenna, and it can be considered as an external module used just for measurement purposes.…”

“…Otherwise, a radius of copper layer ( Cm R ) can be used as a radius of curved on each layer ( m R ). So, we can calculate an extended length of five-layer strip dipole antenna for each layer by (2) [5].…”

“…Especially, it is appropriate for different types of surface in which an antenna tunes itself by changing some properties depending on different environments as shown in [4,5]. This new technique of stacking layer namely Multilayer antenna has been analyzed by reflection coefficient and frequency response.…”