Planar metamaterials and many microwave circuits and antennas are designed by means of resonators with dimensions much smaller than the wavelength at their resonance frequency. There are many types of such electrically small resonators, and the main purpose of this paper is to compare them as building blocks for the implementation of microwave components. Aspects such as resonator size, bandwid...

This paper presents the results of intensive investigations electromagnetic interference caused primarily by closely arranged antennas within subwavelength distance; potential applications involve principle scattering cancellation. A cloaked planar monopole antenna (CPMA) is newly proposed in this work. The performance CPMA compared with that a bare antenna. Numerical simulations two types were...

The development of a planar wideband directional channel model applicable to UMTS micro-cells is addressed. The model, a statistical one based on geometrical considerations, is implemented and simulated, its assessment being performed based on global parameters of channel impulse responses obtained from measurement results. Exemplifying results for the directional channel impulse response are d...

Layered dielectric media is encountered in many electromagnetic problems such as analysis of multi-layered substrate/superstrate microwave circuits and printed antennas as well as modeling the terrain with a dielectric stratified medium. In this section a procedure for evaluating the dyadic Green’s function for a multi-layered (with planar interfaces) medium with arbitrary positions of the sour...

We report broadband monolithic transmitters and receivers ICs for mm-wave electromagnetic measurements. The ICs use non-linear transmission lines (NLTL) and sampling circuits as picosecond pulse generators and detectors. The pulses are radiated and received by planar monolithic bow-tie antennas, collimated with silicon substrate lenses and off-axis parabolic reflectors. Through Fourier transfor...

The concept of optical phase discontinuities is applied to the design and demonstration of aberration-free planar lenses and axicons, comprising a phased array of ultrathin subwavelength-spaced optical antennas. The lenses and axicons consist of V-shaped nanoantennas that introduce a radial distribution of phase discontinuities, thereby generating respectively spherical wavefronts and nondiffra...

The properties of plane electromagnetic waves in free space, and evanescent waves which can exist near planar boundaries are discussed in detail, and their physical characteristics compared. The discussion is then generalised to other configurations, and with the help of Fourier synthesis several problems are considered from a unified physical viewpoint. Topics covered include particle accelera...

A capacitively loaded planar inverted{F antenna (PIFA) is proposed and studied. It is found that the capacitive load reduces the resonance length of the PIFA from =4 to less than =8. A design with a bandwidth of 178MHz centered at 1.8GHz is provided to demonstrate that compact antennas for mobile telephone handsets can be constructed using this approach. The nite diierence time domain method is...

In this paper, we present a noble pattern synthesis method of linear and planar array antennas, with non-uniform spacing, for simultaneous reduction of their side-lobe level and pattern distortion during beam steering. In the case of linear array, the Gauss-Newton method is applied to adjust the positions of elements, providing an optimal linear array in the sense of side-lobe level and pattern...