Ken Paramayudha

Enhancement performance tapered slot vivaldi antenna for weather radar application

Tapered slot vivaldi antenna is an antenna type that has a very wide bandwidth. With that performance, tapered slot vivaldi antenna can cause interference if it is applied on a weather radar that requires a fairly narrow bandwidth only. Therefore, this paper will discuss the design and simulation to narrow bandwidth of the tapered slot vivaldi antenna in order to provide good performance when applied for weather radar that operates at 9.4 GHz. Design and simulation uses CST Microwave Studio software by varying its dimension. From simulation has been obtained vivaldi tapered slot antenna bandwidth narrowed down to 13% at frequency operation, while other antenna parameters still meet to the weather radar antenna requirement.

Adaptively compensated multiband spectral subtraction for robust noise reduction

An adaptively compensated multiband spectral subtraction (MBSS) is presented in this paper. In this research, the adaptive compensation in the MBSS utilizes artificial neural network. The purpose of this compensation is to improve the quality of speech signal after denoising of MBSS step. This compensation is calculated adaptively depend on the MBSS parameters, estimated noise, and difference between input and estimated speech signal. The neural network used was Multi-Layer Perceptron consisted of three hidden layers. The proposed neural network was trained by three speech signals contaminated by white gaussian noises with SNR 0dB and 30dB. For investigating the performance, the proposed method was tested by five noised speech signals with SNR 0dB to 10dB. The result of experiment is examined and evaluated by SNR and PESQ scores. Based on the examination, the proposed speech enhancement method exposed the better performance than the origin MBSS algorithm.

Modified sierpinski patch antenna with co-planar waveguide feed for multiband wireless applications

In this paper, a modified fractal sierpinski patch antenna suitable for multiband wireless application is proposed. Various heights of a triangle component in sierpinski antenna are compared to achieve the desired resonant frequencies and then a coplanar wave guide feed is used to achieve more multiband resonant frequencies within 0-7 GHz frequency range. Return loss characteristics suggest that the antenna is suitable for WLAN, Wimax and also GSM bands for VSWR<;2. Bandwidth measurement based on VSWR=2 for 900 MHz is 245 MHz, at 2.4 GHz is 620 MHz, at 3.3 GHz is 1020 MHz , and for 5.8 GHz is 400 MHz.

Design and realization multi layer parasitic for gain enhancement of microstrip patch antenna

Microstrip antenna has a small gain, bandwidth and efficiency. To overcome those weaknesses, this paper focused on a design of multilayer parasitic substrate for enhancing antenna gain. The distance between first layer parasitic and second layer parasitic had been optimized to maximize electromagnetic coupling and improve antenna main lobe. The microstrip antenna had been fabricated using FR-4 epoxy substrate with 4.2 dielectric constant. Measured antenna acquires unidirectional radiation pattern, 70° beamwidth azimuth, 2.333 GHz–2.377 GHz of operating frequency at VSWR ≤ 2, 44 MHz of bandwidth, and Gain = 4.64 dB. The dimension of realized antenna was 151.5 mm × 151.5 mm. This antenna was purposed to work for LTE band 40 at 2.35 GHz.

Four port diversity patch antennas for MIMO WLAN application

A four port diversity microstrip patch antennas for WLAN was designed, working in the 5.180 to 5.220 GHz frequency. Port diversity was carried out by changing the orientation of the port as of 90° between each consecutive port to reduce mutual coupling and reduce overall dimensions of the antenna. Dimension of realized antenna was 49.48 mm × 49.48 mm. All antenna element has VSWR ≤ 1.5 and mutual coupling ≤ −20 dB. Bandwidth of the antenna 1 to 4 was 92, 96, 68, and 83 MHz respectively. The resulting gain antenna 1 to 4 was 3.306, 3.428, 3.38, and 3.315 dBi respectively. The antenna had unidirectional radiation pattern with elliptical polarization.

X-band antenna design for Indonesian ground surveillance man pack radar

In this paper, an X Band antenna for ground surveillance manpack radar was designed with 15 × 38 cm dimension using RT/Duroid 5880 substrate. The array consisted of 64 patches antenna with a carved slit to obtain a horizontal polarization. The gap between antenna feed were evaluated and the results are that that antenna gain and side lobe level will decrease as the gap became larger. This design has 200 MHz bandwidth with gain of 25.2 dB and side lobe level of −22.7 dB.

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.

Design and realization of circular patch antenna for S-Band Coastal Radar

In this paper, a design and realization of a coastal radar antenna that works on S-Band frequency was presented. Type of antenna that had been used in this research is a microstrip patch antenna. One antenna module consist of eight patch that was horizontally arranged. The microstrip antenna had been fabricated using FR-4 epoxy substrate with 4.6 dielectric constant and a thickness of 1.6mm. Measured antenna acquires unidirectional radiation pattern, 16° beamwidth azimuth, 2.93 GHz – 3.093 GHz of operating frequency at Voltage Standing Wave Ratio (VSWR) ≤ 2; 166 MHz of bandwidth and Gain = 11.98 dB. There was a satisfactory agreement between simulation and measurement result. This circular patch antenna will be implemented for S-Band Coastal Radar.

Design and implementation of UWB band pass filter using modified optimum distributed method for ESM system

This paper presents a design of a microstrip Ultra Wide Band (UWB) Band Pass Filter at 3-12GHz for the Electronic Support Measure (ESM) System. This UWB filter is designed using a modified optimum distributed method, which consist of short-circuited stubs, to meet certain specification. It consists of 10 grounds via hole stub to achieve -60dB rejection at 2GHz with an L-shape to attain the compact size which later be placed inside ESM system module. The filter is simulated using ADS 2011.10 and then fabricated in microstrip using Duroid 5880 substrate. The results of measurement were close to with the results of simulation. The measurement result gave the rejection -60.653dB at 2GHz with insertion loss were about -2.828dB, and the passband cover approximately 3.102GHz-10.926GHz.