Yaya Sulaeman

S-band two stage low-noise-amplifier using single stub matching network

Two-stage low-noise-amplifier (LNA) using single stub matching networks for S-band operation is proposed, designed, and developed. The configuration aims to obtain high gain amplifier with minimum voltage standing wave ratio (VSWR). The proposed LNA consists of the first and the second stages using hetero junction FET NE3509M04 as active device where it has high associated gain. The proposed LNA is designed with planar structure on a Rogers RO4003C substrate. The planar structure is also used for obtaining good matching condition. The Agilent Design System (ADS) 2011.10 software is used for analysis of gain, VSWR, noise figure (NF) values and impedances. Characterizations of the designed LNA at 3 GHz are 1.71 of VSWRin, 3.07 of VSWRout, 6.17 dB of NF and 23.71 dB for gain which is lower 8.66 dB than simulated result.

Double stage Low Noise Amplifier at 1.27 GHz for Synthetic Aperture Radar application

Synthetic Aperture Radar (SAR) is radar technology for remote sensing which transmits electromagnetic pulse to earth where the pulse is reflected back to SAR and received by antenna receiver. The received signal is very low, it should be amplified by Low Noise Amplifier (LNA). To satisfy the SAR system, this paper propose to design a double stage LNA which operate at 1.27 GHz. In the design process, it used active component BJT Transistor of BFP 640 for the both stage. While to achieve the impedance matching condition is deployed on an FR4 substrate which has 4.6 of dielectric permittivity. The Advanced Design System (ADS) is applied to determine gain, voltage standing wave ratio (VSWR), and noise figure (NF) as LNA characterization. The simulation results at 1.27 GHz recorded 42.10 dB of gain, 1.87 of NF, while input VSWR and output VSWR are 1.15 and 1.25 respectively.

Narrow-band microwave planar filter using multiple-poled hairpin resonators

A microwave planar filter using multi-poled Hairpin resonators in a Roger substrate is proposed for narrow-band operation in S-band applications. The proposed filter is composed of several pole resonators with Hairpin structures and designed with planar structures on a Roger substrate. 100 MHz bandwidth in 3 GHz operational frequency is designed for the proposed filter. Calculation methods using simulation software and results of the characteristics are discussed and reported. The proposed device is analyzed using Advanced Design System (ADS) software where the substrate with dielectric constant of 3.48 and thickness of 1.524 mm is used. The designed device has a simple and compact structure, easy in design and fabrication, and compatible with integrated microwave circuit.

Evaluation on detection range of ISRA S-band coastal surveillance radar

In this paper, evaluation of detection range for our ISRA S-band coastal radar is presented. The range of detection for this radar has been compared based on trihedral calibrator computation, simulation of the distance to horizon and the field experiment using the calibrator as a target and mounted on the pole of a ship. Height of the radar antenna against the sea level, height of target and size of target influence the detection range. Based on our field experiment, the target can be detected up to 6 NM (=10.8 Km). The target can be detected beyond 6 NM range scale because of the ship cannot maintain the calibrator always facing the radar site due to the effects of sea waves and there are three islands in front of the radar site that obstruct the radar from detecting targets behinds or nearby the islands.

Dielectric resonance oscillator (DRO) 9.6 GHz for RADAR application

The research of high frequency oscillator module which can be used for radar communications system is reported. This microwave oscillator module is applied using dielectric resonance oscillator (DRO) which operates in 9.6 GHz. The measured charateristics of DRO are bandwidth, power output, frequency oscillation, voltage, current delivery. The experimental results showed that the developed system could be applied in the frequency range from 9.6 GHz to 9.75 GHz, with the voltage of 9 to 12 volts and the current from 11 mA to 17 mA, respectively. The output power of the oscillator about 7 dBm can also be obtained using mechanical tuning at 9.6 Ghz.