A topology optimized metamaterial-based electrically small antenna configuration that is independent of a specific spherical and/or cylindrical metamaterial shell design is demonstrated. Topology optimization is shown to provide the optimal value and placement of a given ideal metamaterial in space to maximize far-field radiated power.

In this paper, a new electrically small metamaterial-inspired monopole antenna is presented. It consists of a simple square-shaped coplanar waveguide (CPW-fed) monopole with an embedded complementary split ring resonator (CSRR). It operates at three distinct frequency ranges around 2.45, 4.2, and 5.8GHz, with low return loss and uniform radiation patterns, making it a perfect candidate for mode...

There has been an ever growing demand for antenna designs that possesses compact size, low profile and multiband features. Recently the possibility of developing antenna designs that exploit in some way the properties of fractals to achieve these goals, at least in part, has attracted a lot of attention. Fractal antennas have useful applications in cellular telephone and microwave communication...

The demand of small size electronic systems has been increasing for several decades. The physical size of systems is reduced due to advancements in integrated circuits. With reduction in size of electronic systems, there is also an increasing demand of small and low cost antennas. Patch antennas are one of the most attractive antennas for integrated RF front-end systems due to their compatibili...

This paper seeks to succinctly e aluate and summarize the large body of literature on the radiation Q of electrically small antennas. The alidity of the different analytic models is discussed, with key Q-dependent physical properties compared with experimental data and numerical simulations. 2001 John Wiley & Sons, Inc. Microwave Opt Technol Lett 28: 172 177, 2001.

A radio frequency identification (RFID) system consists of a reader, a writer, and a tag. Filmtype half-wavelength dipole antennas (shown in Fig. 1.1) have been used as tag antennas in many applications [1]. The antenna performance is governed by the electric current in the tag. When the abovementioned antenna is mounted on the surface of a metallic object, the radiation characteristics are ser...

Passive UHF RFID systems have drawn considerable attention because these can provide a long reading range, high data rate and small antenna size. However, a passive UHF RFID system has challenges in tagging a metallic object due to the effects of conducting materials on the tag antenna performance. This paper proposes two widely used label-type antennas: folded dipole antenna and meandered dipo...

Large channel capacity is achieved by MIMO (Multiple-Input Multiple-Output) technology with multi-antenna at the transmitting and receiving side [1]. Many studies to maximize the MIMO channel capacity have been performed, and measurements show that channel capacity is enhanced by directional antennas [2] and multi-polarization [3] in indoor environment. Various MIMO antennas with pattern and po...

9 In this paper, we introduce a new communication scheme based on cooperative 10 multiple-input multiple-output (MIMO) communication for mobile ad hoc networks 11 (MANETs) in which nodes are endowed with M antennas. According to our new 12 approach, adjacent nodes no longer interfere with each other but rather cooperate 13 attempting to communicate concurrently. In our scheme, during transmissi...