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The performance of free-space optical (FSO) communications that using an optical amplifier (OA) in the scheme of an amplify-received (AR)-relaying has a major drawback in the detection of input signal quality under the effects of turbulence. As an OA is based on a fiber-detection (FD) method to receive and delivers a signal at the amplification process stage, there is an opportunity to implement an...
Communication and data transfer demands are growing fast in last few decades. In order to obtain higher data transfer, it is necessary to determine proper antenna placement in a wireless system. In this paper, we research propagation in tropical environment and L-Band frequency by conducting distance and high variation measurement at frequency 1.8 GHz and 2.4 GHz. The received power level decreases...
This paper demonstrated the radiation performance of the effect of connecting two narrow wall slotted waveguide antennas using flange connectors at X-Band Frequency. The antenna designs consist of 64 slot at WR90 waveguide, with UBR100 flange connector. The simulation results show that side lobe level is the most influenced performance by connection. The antenna without flange connector has a better...
The propagation model of repeaterless ultra-long span transmission system using bidirectional Raman amplifier is presented. General formulation of Raman gain, optical signal power, nonlinear phase shift, and optical signal to noise ratio as a function of fiber effective core area are analytically investigated. Numerical analysis results demonstrate the advantage of large effective core area on reducing...
This paper discusses about the design of a specific radar antenna at ISM frequency band. The overall radar system will be utilized as a trajectory generator for a developed autonomous chaser boat prototype in which the radar antenna was designed to meet this requirement. Fresnel Zone free-space calculation revealed that the radar antenna should be placed at the lake side with a minimum height of 2...
This paper discuses the design of wideband microstrip antenna which is for mobile communication especially for 4G/LTE application. The 4G/LTE applications use frequency bands 850 MHz, 900 MHz, 1800 MHz, and 2300 MHz. Therefore, an alternative to support all these bands in one antenna is to design a wideband antenna. To achieve the antenna specification that has the characteristics of wideband, one...
Radiation characteristics of an antenna should be tested through a precise measurement procedure. To provide an actual parameter of an antenna radiation, measurement must be performed in the far-field region and its distance is proportional to the antenna's dimension. Therefore, in a limited space of an anechoic chamber facility, antenna measurement has a constraint to a maximum dimension of the antenna...
Terahertz (THz) wave frequency region is part of the electromagnetic spectrum. This spectrum is located between 0.3 THz to 10 THz or between radio waves and optics. The THz frequency region has potentials in many different applications, such as imaging, spectroscopy, and wireless communication. However, some problems are still remaining and should be solved to develop THz technology system for an...
Kerr nonlinear signal distortion and optical signal to noise ratio degradation are two major limiting factors on repeaterless bidirectional Raman amplified ultra-long span system. Both of these limiting factors are affected by the size of the fiber effective core area. The impact of fiber effective core area to Raman amplification gain, Kerr nonlinear signal distortion, Raman amplifier induced noise...
In this paper, a novel non-uniform stretching method of linear sparse array antenna design is proposed. This method is developed by applying new approach of inter-element spacing stretching strategy based on Chebyshev polynomial technique. The performance of proposed method is compared to full array antenna configuration with half-wavelength spacing. The simulation result shown the stretching-Chebyshev...
Wireless Body Area Network (WBAN) is one of developed technology that supports telemedical services. WBAN provides low power consumption, mobile, and easier monitoring. This application needs a wearable device especially a textile antenna for implementation. So far, the antenna's performance is mainly affected by a human body when it is applied near to the human body. In this paper, we propose a novel...
This paper presents a Differentially-Driven Rectifier (DDR) for Radio Frequency (RF) energy harvesting system at WLAN frequency 2.4 GHz. This rectifier converts the RF signal into direct current (DC) voltage at the given frequency band. A parameter-S and transient analysis on rectifier circuit is carried out to investigate its band, efficiency and output voltage. The optimum parameters including the...
A Multiband microstrip antenna for Industrial, Scientific and Medical Band (ISM Band) application is proposed in this paper which have a working frequency at 902 – 928 MHz, 2400 – 2480 MHz and 5150 – 5350 MHz. The antenna design uses FR4 substrate with a relative dielectric constant 4.4, thickness 0.8 mm and has a simple structure with small size of 32×72 mm2. The simulation result showed impedance...
Indonesia requires microsatellites for surveillance & remote sensing applications including disaster management such as forest fire, volcanic activity, flood, or even for communication purpose. The first generation Indonesia microsatellite, called LAPAN-A1 (LAPAN-TUBSAT), has been launched on 10th January 2007 as the starting point to further develop microsatellite technology in Indonesia. The...
The Smart antenna for Broadband Wireless Access used beamforming method by focusing the direction of the antenna beam to some desired targets. This paper discusses beamforming control system to control the direction of the antenna beams electronically by using 16MHz Arduino platform-based microcontroller algorithm. The microcontroller was programmed to control the switching network that connects to...
This paper proposes the design of weather radar antenna on X-Band frequency with two polarizations. The antenna is built based on slotted waveguide antenna array (SWAA) with its antenna structure consists of 2 layers, first layer is a radiating waveguide and second layer is a feeder waveguide. The first layer is composed of 5 waveguides in which each of waveguide consist of 64 slots, while the second...
The main problem in a communication system that uses a single radar antenna as a receiver and transmitter is the possibility that the incoming signal is reflected back to the signal generator thereby disrupting the received signal. For the establishment of good communication, we need a device to redirect input and output signal, to dampen the signal (feedback) so that there is no reflections, and...
Microstrip antenna technology is currently widely used in various applications in the radar and telecommunications world, one of which is used for X-Band Radar application such as Vessel Traffic System (VTS) Radar Antenna. The choice of Microstrip Array Antenna is because this antenna type is simpler to array to obtain radiation characteristics like high directivity, high gain and narrow beamwidth...
This paper proposed a new approach of linear sparse array antenna design with a hybrid technique of non-uniform elements spacing and combinatorial cyclic different sets (CDS) to achieve high resolution requirement in radar applications. As an example, the spatial dimension of 64 elements linear microstrip full array configuration (d = 0.7λ) is reduced to 32 elements linear sparse array configuration...
This paper presents a 4×4 Butler matrix as a beamforming network that is combined with a 4-elements linear aperture coupled antenna arrays to produce four narrow steerable beams. The designed array is aimed to obtain a operating frequency at 2350 MHz for LTE applications by using the Advance Design System (ADS) and CST Microwave Studio. The measurement result shows that the bandwidth for each port...
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