This paper presents design and fabrication of 2way Wilkinson power divider (WPD) for dual operating frequency. This WPD use dual operating frequencies on 2.4GHz and 4.928GHz. In this WPD, two branches of impedance transformer and the output ports are shunted with parallel connection of a resistor (R), an inductor (L) and a capacitor (C).Simulation and measurement results of this WPD design are shown by the graphs of insertion loss (S21 and S3t>, return loss both of input and output (Sl1, S22 and S33) and also isolation between the output ports (S32). Based on the simulation and measurement results, this WPD have a better insertion loss and isolation, and also produce a better return loss of input and output ports for operating on the both frequencies of2.4GHz and 4.928GHz.
In this paper, a research on coastal Radar to support C4ISR (Command, Control, Communications, Computers, Surveillance and Reconnaissance) was carried out.This coastal Radar has an advantage of easy to be transported in order to observe seas/coastal areas in different locations. The Radar technology used in this research is FM-CW (frequency modulated continuous wave) with a S-band working frequencies, where this type of Radar has a LPI (low probability of intercept) capability. In this paper, the presentation is on antenna and hardware development, while the radar software is currently still on progress for the installation. The Radar consists of antenna system (dual antenna), an antenna moving parts (stator + motor), the high frequency part of RF (radio frequency), power supply, rotary joint for connecting between the RF with antenna, down converter to convert the signal RF to IF (intermediate frequency), power splitter 3-1 and 1-3 serves as a multiplexer and de-multiplexer. The mux/de-mux connects to the signal processing part of IF, part of the data processing and Radar signal, and the Radar display. The designed and fabricated antenna system produces bandwidth of 61.25 MHz, VSWR at 3 GHz = 1.303, one degree of horizontal angle and vertical angle of 19.6 degrees. The measurement results show a similarity between the designed and the measured antennas, i.e., the vertical beamwidth <20 ° and antenna gain array of 27.52 dBi.
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