The Design of Miniaturized Printed Wire Antennas Using Double-Layer Periodic Metallization

Abstract

Abstract-The design of miniaturized printed wire antennas using multilayer vias loaded periodic metallization is presented. The proposed structure is evolved from a periodic slow-wave transmission line, where each unit cell is made of a patch and two loops spread over two metal layers connected in series through vias. A section of the periodic metallization is used as a quarter-wave monopole antenna protruded over a truncated ground plane and fed by a microstrip line. The design prototype at 2.4 GHz band shows that it is possible to obtain 24% 10 dB bandwidth with 80% efficiency at an antenna length of 12 mm long without tuning inductors, more than a 50% reduction from a normal printed straight monopole.Index Terms-Electromagnetic band-gap, monopole antennas, slow wave structures, small antennas, wideband.

Low-cost surface-reduction technique for RFID reader antennas

“…The technique that we use is based on the FSS proposed by [3,4]. It allows the creation of slow wave on planar devises.…”

“…It allows the creation of slow wave on planar devises. This technique is useful for passive functions such as coupled line filters and power dividers [3,4]. As this FSS uses only two metallic layers without via, it seems to be appropriate for size reduction of antennas of low-cost applications.…”

“…As this FSS uses only two metallic layers without via, it seems to be appropriate for size reduction of antennas of low-cost applications. The structure proposed by [3,4] is composed of an array of patterned slots burned on the ground plane (see Fig. 1).…”

“…Good results have already been obtained, but it also suffers of important fabrication cost. Frequency selective surfaces (FSS) have been already used by [3,4]. Reference 3 uses slot patterned ground to suppress the substrate-wave losses of a patch antenna but not to reduce antenna size.…”

“…Reference 3 uses slot patterned ground to suppress the substrate-wave losses of a patch antenna but not to reduce antenna size. A small wire antenna has been published in the 2.5 GHz ISM frequency band [4], but it is based on multilayer vias loaded periodic metallization which increases the final cost of the antenna. In this article, the same FSS as [3] has been used to create slow wave phenomenon under a patch antenna.…”