1. INTRODUCTION There is a great demand for broadband antennas used for many applications such as the ultra-wideband (UWB) communications, the EMI measurements and the wideband radars. Considering the transmission and reception of pulse signals, not only broadband characteristics of input impedance and radiation pattern but also the distortionless condition are required. Among many types of bro...

Multiple input multiple output antenna is the key technology which enables design of 5G networks. In order to achieve desired beam forming and side lobe reduction capabilities, antennas used in MIMO are required feed with signals having different phase amplitude. It possible variable shift attenuation using shifter amplitude limiters. However when these devices between source antenna, they make...

A low-cost method to 3D print and metalize circular waveguide components is demonstrated using polylactic acid (PLA) aluminum adhesive backed tape. gradient index (GRIN) lens, an externally metalized thin-walled conical horn, a WR90 rectangular linearly polarized transition are simulated, fabricated, measured. The horn lens were both monolithic prints that metallized simplify the metallization ...

This letter introduces a technique for the power density (PD) pattern measurement in near field taking into account antenna/body coupling at millimeter waves (mmW). The proposed method employs specifically designed structure reproducing reflection coefficient from human skin. is optimized to convert absorbed PD an infrared (IR) pattern, remotely recorded using high-resolution IR camera reconstr...

The environment of confined spaces such as tunnels and coal mines is complex changeable. When the wireless signal propagates in it, it will be affected by reflection diffraction shaft wall, which puts forward higher requirements for radiation beam mine antenna. In this paper, corrugated horn antenna model selected to design a whose pattern almost equal Gaussian beam. Starting from expression be...