Mariusz Pergol

Rectangular Microstrip Resonator Illuminated by Normal-Incident Plane Wave

In the paper, an Illuminating Modes concept is introduced in order to flnd microstrip antenna parameters | resonant frequency, resonant resistance and radiation pattern. The concept is based on illuminating the rectangular patch by a single normally-incident plane wave. It results in the surface current density induced on the patch which is found by means of two-dimensional Spectral Domain Approach. Then, the resonant frequency, the quality factor, the resonant resistance and the radiation pattern of the analysed antenna are found. Application of Illuminating Mode concept in Spectral Domain Approach efiects in analysis simpliflcation and less time consuming calculations with no waste of the accuracy. Exemplary results for several kinds of radiators are presented, showing satisfactory level of agreement with published data.

Compact planar balun for the UWB dipole feeding network

Results of numerical simulations of a compact ultra wideband planar microstrip-to-coplanar strips balun is described in this paper. This circuit has been designed on the basis of configuration referenced in the literature. However, for application in the UWB antenna feeding networks it has been redesigned for the appropriate substrate. The designed balun has been loaded with a planar circular dipole, in order to validate its usefulness. Results obtained from full-wave simulations are presented in the paper. Calculated parameters of the balun and antenna show satisfactory level and predestine the circuit for fabrication.

Unified Design Procedure for Planar Dipoles Oriented on UWB Application

In the paper, the unifled design procedure for planar dipoles oriented on UWB application is proposed. The procedure leads to obtain a good matching characteristic of planar dipoles in UWB frequency band. The design process is split into two parts: the radiator and the balun design. The Radiator Quality Factor (RQF) is deflned as an evaluation suitability of planar radiators to be matched in UWB frequency band. Based on RQF, the optimal circular radiator is chosen, and the whole dipole antenna is designed. The general algorithm of antenna design is formulated and utilised in the planar dipole with elliptical arms project. Two antennas, with circular and elliptical arms, have been fabricated and measured in order to verify the design procedure. Both antennas are characterized by the re∞ection coe-cient less than i10dB from 2GHz up to 14GHz.

Modal analysis of planar elliptical resonator deposited on unshielded dielectric slab

Modal analysis of isolated open planar elliptical patch placed on dielectric slab is presented in the paper. It applies concept of Illuminating Modes which is formulated for the case of two-side opened structure. The current on patch is expanded in basis functions in form of Mathieu radial and angular functions. The spectrum of excited modes for exemplary planar resonators is presented and discussed using the concept of power of single current mode and power of total current resulting from plane wave illumination of the structure. The corresponding radiation patterns are also presented and discussed.

Planar dipole antenna for radar application

A planar antenna for radar application is presented in the paper. The radiating structure is a dipole of elliptical arms. It has been designed by means of CST MWS 2013 as a single radiation source for application in an array. The antenna consists of dipole radiator, feeding structure and conducting block which is a part of transceiver operating in C-band. Reflection coefficient of the antenna is below -15 dB in the desired 8% band, radiation pattern is characterised by wide main beam with reduced backward radiation.