Broadside subwavelength microstrip antennas partially loaded with metamaterials

IET Microwaves, Antennas & Propagation

et al. 2013

In this study, a novel technique to achieve multi-band performance for both reduced and conventional size circular microstrip patch antennas loaded with metamaterial has been proposed. Incorporation of symmetric slotting concept with the concept of additional mode modification for both MNG (µ negative) and ENG (ɛ negative) metamaterial loaded circular patch antennas have been shown. The use of metamaterial creates an unconventional mode, whereas symmetrical slotting not only modifies another band but also improves the gain by around 1 dB of unconventional mode for MNG loaded antenna. Design algorithms for metamaterial loaded circular patch antennas have been developed to achieve size reduction and highly directive multiband property. Based on these design algorithms, at first a reduced size triple band circular patch antenna loaded with MNG metamaterial has been shown where around 35% size reduction is achievable. Later, a triple band conventional size circular patch antenna partially loaded with ENG metamaterial has been designed with high gain and directive performances for all three bands compared to previously reported such antennas.

Section: Introductionmentioning

confidence: 95%

Reduced and conventional size multi‐band circular patch antennas loaded with metamaterials

IET Microwaves, Antennas & Propagation

et al. 2013

“…Alù et al proposed design method to obtain electrically small rectangular patch antennas using DPS (double positive) ENG metamaterial juxtaposed layer [3]. But such rectangular patches give broadside null radiation pattern at subwavelength regime as illustrated in Figure 2 of [4]. Finally, it was predicted that all these electrically small rectangular antennas loaded with metamaterial can only be good resonators but may not be good radiators.…”

Section: Introductionmentioning

confidence: 99%

“…Finally, it was predicted that all these electrically small rectangular antennas loaded with metamaterial can only be good resonators but may not be good radiators. But if the shape is circular [4,5] or elliptical [6], theoretically it is possible to achieve electrically small size without deterioration of radiation performance. With this concept we developed a proper algorithm in [1], where achieving additional unconventional mode in metamaterial loaded circular patch antenna has been possible.…”

Section: Introductionmentioning

confidence: 99%

Novel Dual Band Microstrip Circular Patch Antennas Loaded with ENG and MNG Metamaterials

International Journal of Antennas and Propagation

et al. 2014

Novel design of a dual band microstrip circular patch antenna loaded with ENG (εnegative) metamaterial has been shown in the first section. Using ENG metamaterial instead of the conventional dielectric, unconventional TMδ10(1<δ<2) mode was produced to yield a dual band performance. Optimized parameters such as permittivity (ε1) and filling ratio (η) of metamaterials were selected with the aid of a MATLAB based parameter optimization algorithm, developed for all these sort of patch antennas. In the second section, a dual band circular patch antenna loaded with MNG (µ negative) metamaterial has been reported. An unconventional modified TMδ10(0<δ<1) mode has been produced along with conventional TM110mode due to using MNG metamaterial. Here also the optimum values of permeability (µ1) and filling ratio (η) for these sorts of patch antennas have been calculated from a MATLAB based parameter optimization algorithm. Both the proposed antennas provide good and resonance and satisfactory radiation performances (directivity, radiation efficiency, and gain) with a dual band performance.

“…At first Alu et al proposed design method to obtain electrically small rectangular patch antennas using DPS (Double Positive)-ENG metamaterial juxtaposed-layer [5]. But such rectangular patches give broadside null radiation pattern at subwavelength regime as illustrated in Fig.2 of [6]. Finally, it was predicted that all these electrically small rectangular antennas loaded with metamaterial can only be good resonators but may not be good radiators.…”

Section: Introductionmentioning

confidence: 99%

Conceptual and practical realization of reduced size multi-band circular microstrip patch antenna loaded with MNG metamaterial

2012 7th International Conference on Electrical and Computer Engineering

et al. 2012

In this paper, an MNG metamaterial loaded circular microstrip patch antenna has been reported. This antenna not only shows multi-band performance but also provides maximum possible size reduction (35%) with realizable gain performance. Achieving triple band performance was made possible by modifying TM δ10 (0<δ<1) mode (using µ-negative metamaterial) along with TM 210 mode modification with symmetrical slots. At first, simulation performance of this antenna on the basis of proper design algorithm [1] has been shown. Later, with appropriate choice of parameters, a practical modeling of MNG metamaterial using helices that can be used to fabricate this sort antenna, has been demonstrated for verification. In [2] three helices were used to fabricate MNG metamaterial, but here it is shown that one helix provides better directivity instead of three. This will certainly minimize fabrication complexity in MNG metamaterial.