In this paper the ability to measure a radiation pattern of omnidirectional antennas without using an anechoic chamber is presented. For this purpose, the time domain technique is used and the influence of this solution on an antenna radiation pattern is shown. Moreover difference between radiation patterns obtained from an anechoic chamber and office room using postprocessing in time domain are presented.

Glass–ceramic composites containing cordierite, mullite, SiO2 glass and SiO2-B2O3-Al2O3-BaO-ZrO2 glass were fabricated in a process comprising solid state synthesis, milling, pressing and sintering. Thermal behavior, microstructure, composition and dielectric properties in the Hz-MHz, GHz and THz ranges were examined using a heating microscope, differential thermal analysis, thermogravimetry, scanning electron microscopy, energy dispersive spectroscopy, X-ray diffraction analysis, impedance spectroscopy, transmission method and time domain spectroscopy (TDS). The obtained substrates exhibited a low dielectric permittivity of 4.0–4.8. Spontaneously formed closed porosity dependent on the sintering conditions was considered as a factor that decreased the effective dielectric permittivity.

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This paper presents the challenge involved in designing LTCC leaky wave antenna operated in mm-wave band. Taking account a possibility of using LTCC technology in the mm wave, some advantages and limitations of its technology in these frequency band are described. Moreover the transition between waveguide to designed antenna is presented and the simulation results of each parts of the structure are shown. Moreover some manufactured parts of the antenna with using LTCC technology is shown. The antenna is optimized to obtain a minimum radiation pattern squint in all operated frequency bandwidth. Index Terms-Low Temperature Cofired Ceramic (LTCC), leaky wave antenna, mm-wave