40 research outputs found
Design of Low Power Wideband Low Noise Amplifier for Software Defined Radio at 100 MHz to 1 GHz
This paper describes the design of wideband low noise amplifier (LNA) for mobile software defined radio (SDR) application which
targeted to be applied in two-way communication mobile system architecture. The technical specification was deduced from the TIA-
603C standard receiver system sensitivity and intermodulation. The proposed LNA exhibit low power consumption and adopts a negative
feedback wideband amplifier topology, operated from 100 MHz to 1 GHz which covers the whole Land Mobile FM Communication
Equipment (136 941 MHz) frequency band. The proposed topology solve the RF tracing problem inherited in the targeted frequency
and also the problem of economically impractical PCB size rendered by other wideband amplifier methods. The Advanced Design System
software is used to perform the simulations. The measured result show the proposed LNA has a stable gain of more than 15 dB, noise
figure less than 1.5 dB, S11 and S22 less than -10 dB, with current consumption of 8 mA from voltage supply at 1.8 V
Development of Greenhouse Monitoring using Wireless Sensor Network through ZigBee Technology
Greenhouses are often used for growing flowers, vegetables, fruits, and tobacco plants. Most
greenhouse systems still use the manual system in monitoring the temperature and humidity in the greenhouse, a
lot of problems can occur not for worker but also affected production rate because the temperature and
humidity of the greenhouse must be constantly monitored to ensure optimal conditions. The Wireless Sensor
Network (WSN) can be used to gather the data from point to point to trace down the local climate parameters in
different parts of the big greenhouse to make the greenhouse automation system work properly. This paper
presents the design of low cost greenhouse monitoring system to monitor a greenhouse temperature and
humidity parameters by applying the ZigBee technology as the WSN system. During the design process,
Peripheral Interface Controller (PIC), LCD Display and Zigbee as the main hardware components is used as
hardware components while C compiler and MP Lab IDE were used for software elements. The data from the
greenhouse was measured by the sensor then the data will be displayed on the LCD screen on the receiver
which support up to 100 m range. By using this system, the process of monitoring is easier and it also cheaper
for installation and maintenance. The feasibility of the developed node was tested by deploying a simple sensor
network into the Agriculture Department of Melaka Tengah greenhouse in Malaysia
Design of Low Cost Greenhouse Monitoring using ZigBee Technology
Greenhouses are often used for growing flowers,
vegetables, fruits, and tobacco plants. Most greenhouse
systems still use the manual system in monitoring the
temperature and humidity in the greenhouse, a lot of
problems can occur not for worker but also affected
production rate because the temperature and humidity of
the greenhouse must be constantly monitored to ensure
optimal conditions. The Wireless Sensor Network (WSN)
can be used to gather the data from point to point to trace
down the local climate parameters in different parts of the
big greenhouse to make the greenhouse automation system
work properly. This paper presents the design of low cost
greenhouse monitoring system to monitor a greenhouse
temperature and humidity parameters by applying the
ZigBee technology as the WSN system. During the design
process, Peripheral Interface Controller (PIC), LCD
Display and Zigbee as the main hardware components is
used as hardware components while C compiler and MP
Lab IDE were used for software elements. The data from
the greenhouse was measured by the sensor then the data
will be displayed on the LCD screen on the receiver which
support up to 100 m range. By using this system, the
process of monitoring is easier and it also cheaper for
installation and maintenance. The feasibility of the
developed node was tested by deploying a simple sensor
network into the Agriculture Department of Melaka
Tengah greenhouse in Malaysia
Simulation of 2.4 GHz Low Power RF Front End Design for Radio over Fiber Technology
This paper presents the simulation low power RF front end design of radio access point (RAP) for Radio over Fiber (RoF) technology at 2.4 GHz. Wireless network based on radio over fiber (RoF) technology has been proposed as a promising cost effective solution to meet ever increasing user bandwidth and wireless demands. In this network, a central station (CS) is connected to numerous functionally simple radio access point (RAP) via an optical fiber.The only components required at the passive RAP are Electro Absorption Modulator (EAM) and antenna where EAM is used as a remote transceiver. Pico cell has a coverage range up to 100 m. To achieve this distance, RAP needs to operate in active mode, by inserting RF power amplifier and Bandpass Filter (BPF) between EAM and the antenna for the downlink path. BPF is needed remove out of band interference after EAM while the power amplifier is used to improve the dynamic range of RAP. The implementation of the design is based on microstrip technology and Advanced Design System (ADS) software used to perform the simulation. In the simulation, the analyses of scattering parameters are concerned which presents the gain and return loss of the front end. At the end of design, the combination between parallel couple BPF and power amplifier is purposed as a RF front end of RAP for RoF technology
Design of Low Noise Amplifier for Radio over Fiber at 5.2 GHz
This paper presents the design and simulation of low noise amplifier (LNA) used in an active radio
access point (RAP) for Radio over Fiber (RoF) technology at 5.2 GHz. RoF is integration of optical fiber for
radio signal transmission within network infrastructures that is considered to be cost effective, practical and
relative system configuration for long haul transport of millimeter frequency band wireless signal. The LNA
designed function is to amplify extremely low signals without adding noise, thus preserving the required Signal
Noise Ratio (SNR) of system at extremely low power signal. The implementation of design is based on Agilent
ATF-5143 transistor and Microwave Office software is used to perform the simulation in S-parameters. The
design and simulation process including selecting the transistor based on RoF requirements, stability of
transistor, matching network, biasing and optimization. The design has shown an acceptable behavior with gain
of 16.046 dB and noise figure of 0.9368 dB using conjugate matching method
Design of Wideband Low Noise Amplifier using Negative Feedback Topology for Motorola Application
This paper describes the design of wideband low noise amplifier (LNA) for Motorola application which targeted to be applied in two-way communication mobile system architecture. The technical specification was deduced from the TIA-603C standard receiver system sensitivity and inter-modulation. The proposed LNA exhibit low power consumption and adopts a negative feedback wideband amplifier topology, operated from 100 MHz to 1 GHz which covers the whole Land Mobile FM Communication Equipment (136 – 941 MHz) frequency band. The proposed topology solve the RF tracing problem inherited in the targeted frequency and also the problem of economically impractical PCB size rendered by other wideband amplifier methods. The Advanced Design System software is used to perform the simulations. The measured result show the proposed LNA using FR4 board has a stable gain of more than 15 dB, noise figure less than 1.5 dB, S11 and S22 less than -10 dB, with current consumption of 8 mA from voltage supply at 1.8 V
Design the High Gain and Low Power Amplifier for Radio over Fiber Technology at 2.4 GHz
This paper describes the high performance design a power amplifier for Radio over Fiber (RoF) Technology at 2.4 GHz using Agilents HBFP-0450 transistor. Based on wireless network RoF technology has been proposed as a promising cost effective solution to meet ever increasing user bandwidth and wireless demands. In this network, a central station (CS) is connected to numerous functionally simple Radio Access Point (RAP) via an optical fiber. The only components required at the passive RAP are Electro Absorption Modulator (EAM) and antenna where EAM is used as a remote transceiver. There are practical limitations on the power that can produce by the passive RAP which can affect the dynamic range. In order to improve the dynamic range of passive pico cell RAP power amplifier is placed at the front end of RAP for the downlink transmission which operate in active mode. The central station (CS) is connected to numerous functionally simple RAP via an optical fiber in the RoF network. The design is based on the conjugate matching method which able to achieve the maximum gain. The performance of the design simulation done using Agilent Advanced Design System (ADS) software . The design has shown an acceptable behavior with gain of 13.172 dB. At the 1-dB compression point the output power is approximately 16.108 dB and the Power Added Efficiency (PAE) is 24.915 %
Simulation of WiMAX System Based on OFDM Model with Difference Adaptive Modulation Techniques
This paper presents the simulation of Worldwide Interoperability for Microwave Access (WiMAX)
system based on Orthogonal Frequency Division Multiplexing (OFDM) with different adaptive modulation
techniques. WiMAX is the next generation broadband wireless technology which offers greater range and
bandwidth compared to the other available broadband wireless access technologies such as Wireless Fidelity
(WiFi) and Ultra Wideband (UWB) family of standards. The simulation is based on the WiMAX physical
layer which adopted an OFDM model in the transmitter and receiver. The Matlab software is used to develop
the OFDM model and analysis the performance of WiMAX system. Hence the investigation of the
performance of OFDM physical layer in WiMAX system by using different adaptive modulation techniques
like Binary Phase Shift Keying (BPSK), Quadrature Phase Shift Keying (QPSK), Quadrature Amplitude
Modulation (QAM) for modulator and demodulator. The performance of system was compared between the
model with cyclic prefix and without cylic prefix. The cyclic prefix is added additional bits at the transmitter
end. The signal is transmitted through the channel and it is received at the receiver end. Then the receiver
removes these additional bits. The purpose of the cyclic prefix is to minimize the inter symbol interference
and to improve the bit error rate. The analysis is based on the Bit Error Rate (BER), Signal to Noise Ratio
(SNR) and probability error. At the end, the modulation BPSK and QPSK have the lower bit error rate while
the 64 QAM has the higher bit error rate at low SNR. For the probability of error, the lower order
modulation scheme also has the lower BER at low SNR
Compact Ultra-Wideband Antenna Using Coplanar Stripline (CPS)-Fed
Today’s wireless communication systems should be capable to fulfill various insatiable demands for higher data rate and resolutions requirement. In order to satisfy those requirements in UWB system, a lot of antennas that can provide wide bandwidth have been proposed. In this paper, a coplanar stripline (CPS)-fed antenna for ultra-wideband (UWB) application was proposed. This antenna was designed using FR4 board with dielectric constant, r = 4.4, tangent loss, tan = 0.02 and substrate’s thickness, h = 1.6mm. The simulation was done using Computer Technology (CST) software. The simulation result shows that the modified coplanar stripline (CPS)-fed antenna significantly improved the fractional bandwidth by 200 % at frequency range 3.386 GHz -12.943 GHz. The optimal results of this coplanar ultra-wideband antenna were 5.100 GHz, 9.836 GHz and 12.155 GHz with a gain of 2.598 dB, 4.452 dB and 5.383 dB and the return loss of – 46.845 dB, - 23.428 dB and – 13.595 dB