A wide band, integrated linear printed antenna array with low sidelobe cosecant square-shaped beam pattern is presented. Array synthesis mainly about the wide shaped coverage, low ripple and sidelobe level (SLL) has been done using the modified least square method by matrix inversion. A printed dipole integrated with wideband balun has been chosen as the array element for wide bandwidth and goo...

A 50 to 550MHz wideband gallium nitride (GaN) HEMT power amplifier with over 43 dBm output power and 63% drain efficiency has been successfully developed. The demonstrated wideband power amplifier utilizes two GaN HEMTs and operates in a push-pull voltage mode Class D (VMCD). The design is based on a large signal simulation to optimize the power amplifier’s output power and efficiency. To assur...

This paper presents a circularly polarized turnstile antenna for meteor radar system. The employs pair of radiators, 1:2 power divider and 90° phase shifter. After series simulations optimizations, the maximum gain at 39 MHz is 5.9 dBic with 96° 3 dB beam width. simulated axial ratio below from −39° to 39° within band interest. Then, proposed fabricated applied Two tests are carried out radiati...

Broadband transformers are not difficult to understand. They are commonplace in today's amateur technology. Most broadband transformers are wound on ferrite toroids or rods. Some are wound on powdered-iron cores, while others are formed on pot or cup cores. We will confine our discussion to transformers that are wound on ferrite toroids or balun cores (sometimes called "binocular" cores. Basic ...

In this paper, a balanced antenna for mobile handset applications with enhanced bandwidth performance, that covers four bands (GSM1800, GSM1900, UMTS and 2.4-GHz WLAN), is investigated. The antenna is a slot planar dipole with folded structure and a dual-arm on each monopole. A wide bandwidth planar balun is employed to feed the wideband balanced antenna from an unbalanced source. A prototype o...