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RF and Microwave Conference (RFM), 2011 IEEE International

Date 12-14 Dec. 2011

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Displaying Results 1 - 25 of 119
  • [Front cover]

    Page(s): c1
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  • [Title page]

    Page(s): ii
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  • [Copyright notice]

    Page(s): i
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  • Contents

    Page(s): iii
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  • Chairman's message

    Page(s): iv
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  • Organizing committee

    Page(s): v
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  • List of reviewers

    Page(s): vi - vii
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  • Technical program overview

    Page(s): viii - ix
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  • Technical program details

    Page(s): x - xxix
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  • Author index

    Page(s): 452 - 455
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  • Microwave Technology Centre

    Page(s): 456
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  • [Advertising backmatter]

    Page(s): 1
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  • Measurements and reduction of microwave oven electromagnetic leakage

    Page(s): 1 - 4
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (608 KB) |  | HTML iconHTML  

    Public believed that radiation leakage from microwave ovens was similar to atomic radiation that could lead to serious health problems, including cancer. For many years up to now, domestic microwave ovens were not considered to leak levels of microwave radiation that caused concerns; consequently, they have not been regularly monitored. According to Australian Standard 3301, the maximum allowable leakage from a microwave oven is 5 mW/ cm2 at 5 cm distance from the oven surface. These safety standards were based on the belief that the only danger from exposure to high intensity microwave energy is a thermal or overheating effect. Since the leakage from microwave oven becoming a new issue, this paper is proposed to investigate the effect of oven leakage, the issue of emission levels versus exposure levels and the application of power density measurements in order to measure the leakage from microwave ovens. There are six measurements have been conducted and it is found that all of the microwave ovens are having leakage. From the measurement results, only one microwave oven gives a value of 10.19 mW/cm2 which is exceeded the limit of 5mW/cm2. Due to this reason, ti is suggested to use Conductive Transparent Film to reduce the leakage from the microwave oven, since it is a relevant way in shielding to prevent unwanted leakage from the microwave oven. The result shows that the Conductive Transparent Film can reduce the microwave oven leakage by about 12.39 dB to 8.53 dB. View full abstract»

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  • Direct feed biconical antenna as a reference antenna

    Page(s): 5 - 8
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (475 KB) |  | HTML iconHTML  

    Antenna factor is the main parameter in EMC measurement. Therefore, accurate and low uncertainty antenna is important in order to gain a reliable antenna factor. Direct feed biconical antenna has low uncertainty because balun can be eliminated in the design. Furthermore, the biconical antenna has fix phase center. This paper focuses on type of connectors and antenna sizes that are suitable to be used as a calibration antenna. The return loss for frequency range between 200Mz to 2GHz was measured using network analyzer and found to vary between 10dB to 20dB. View full abstract»

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  • Calculable antenna factor of a biconical reference antenna

    Page(s): 9 - 12
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (326 KB) |  | HTML iconHTML  

    Calculable antenna is used as a reference antenna for antenna calibration to obtain accurate antenna factor. This paper focuses on calculable biconical antenna with low uncertainty. The proposed biconical antenna factor can be derived either by simulation or by analytical method. The antenna factor is directly derived from antenna gain. Therefore, the uncertainty could be improved due to no measurements involved. The antenna factor versus frequency is presented for frequency range 200 MHz up to 2GHz. View full abstract»

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  • The application of wire mesh ground plane in Open Area Test Site for radiated emission measurement

    Page(s): 13 - 18
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (949 KB) |  | HTML iconHTML  

    Nowadays, the manufacturers apply the radiated emission test for all of their electrical or electronic products in order to avoid disturbance to other electrical or electronic products and to fulfil national or international standards. An Open Area Test Site (OATS) is one of the facilities used in the radiated emission measurement which requires the equipment under test (EUT), a receiving antenna with the antenna mast, the ground plane, and the radiated emission measurement device. The focus of this research is mainly about the ground plane of the OATS which can reflect the emission from the EUT to the receiving antenna. The perfect ground plane is very expensive; therefore the wire mesh ground plane can be used to cut the cost. The investigation of the ground plane could lead to an applicable radiated emission test and the accuracy of the measurement by using the mesh ground plane in OATS. In solving the problems related to the ground plane, the measurement of Normalized Site Attenuation (NSA) will be compared with the theoretical NSA. NSA is measured by transmitting signal from the frequency of 30 Mega Hertz (MHz) until 1000 MHz, assuming only two waves propagation which are direct wave and reflected wave. View full abstract»

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  • Harum Manis mango dielectric properties based on maturity

    Page(s): 19 - 20
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (643 KB) |  | HTML iconHTML  

    This paper presents Harum Manis mango maturity characterizations based on dielectric properties. Currently, Harum Manis maturity is determined by referring to number of weeks of growth and farmer experience. This paper proposes a quick and simple microwave measurement technique. An open ended dielectric probe is used to measure dielectric properties of Harum Manis mango for frequency range from 500 MHz until 20 GHz. The relationship between dielectric constant and loss factor as well as week of growth is established. These data contributes to further research of Harum Manis maturity sensor application. View full abstract»

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  • Linearity and efficiency enhancement techniques in microwave transmitters

    Page(s): 21 - 25
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (607 KB) |  | HTML iconHTML  

    In microwave power amplifier (PA) design, high linearity is required in order to maintain the integrity of the amplified, modulated signals. High spectral efficiency in a communication signal can be achieved by the use of non-constant envelope modulations, which place particularly high demands on the PA linearity. High power efficiency is also increasingly important, given the drive to control CO2 emissions and reduce energy consumption. Simple measures to improve linearity, such as operating a Class A amplifier well backed off from saturation, result in very poor efficiency. The trade-off between linearity and efficiency can be improved by adopting a more complex amplifier topology or incorporating the amplifier into a more complex transmitter architecture. This paper presents a review of existing and recently developed techniques for the enhancement of PA linearity and efficiency. It explains the basic principles behind the techniques, provides comparisons of their relative advantages and disadvantages and discusses possible future directions. View full abstract»

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  • Tuning circuit based on varactor for tunable filter

    Page(s): 26 - 28
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (848 KB)  

    A tuning concept of a quarter wavelength side-coupled ring resonator is proposed by introducing varactor diode as tuning device at the four corners of the ring resonator to allow modification of the ring electrical length. This modification is typically used to allow the variation of the capacitance as a function of bias voltage thereby resulting in center frequency tuning. A complete tunable circuit is simulated using electromagnetic (EM) circuit simulator involving the integration of microstrip technology and lumped elements on Taconic substrate. The proposed tunable ring resonator manages to achieve13% of tuning range. View full abstract»

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  • Miniaturized multiband matched band-stop filter

    Page(s): 29 - 32
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (674 KB) |  | HTML iconHTML  

    Multiple stop-bands are required in order to suppress interference in radio spectrum with multiple wireless systems operating in it. In addition, wireless communication systems usually require small devices to fulfill the miniaturization requirements and simplicity of mobile unit. As a result, this paper is to propose a novel miniaturized matched band-stop filter with high rejection level. This filter results in 50 % size reduction compared with the dual-mode ring resonator that has an electrical length of 360°. In addition for the short electrical length of this filter the first spurious resonance occurs at 4.7 times the fundamental resonance frequency. The filter design is cascaded to achieve multiband band-stop filter at center frequencies of 0.99 GHz and 1.04GHz. Theoretical analysis together with experimental results is presented to demonstrate the feasibility of the approach. View full abstract»

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  • Wideband local oscillator design for wideband transceivers

    Page(s): 33 - 36
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (697 KB) |  | HTML iconHTML  

    The wideband transceivers like the software defined radio require designing wideband RF hardware covering octave bands. The local oscillator of the mixer should be a wideband frequency synthesizer. Building on the theory of oscillations in the voltage controlled oscillator, the paper reviews the concept of negative resistance in the transistor circuit with some base inductance. It also provides simulation of this concept. To apply the theory and simulation, the actual VCO hardware was designed and fabricated for the range covering 1200 to 2400 MHz. These VCOs were used in the design of wideband PLL frequency synthesizer. The results including very good phase noise performance are presented. This approach can be used to design wideband synthesizers in other RF range. View full abstract»

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  • Dual-path fourth-order microstrip coupled lines filter for wideband applications

    Page(s): 37 - 39
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (430 KB) |  | HTML iconHTML  

    A novel fourth order coupled lines filter topology is presented based on two parallel paths containing quarter-wavelength coupled lines. Three identical coupled lines are combined in series in each path to form a ring structure. This configuration leads to the compactness of a highly selective filter. The proposed filter is designed for wideband applications whose center is at 3 GHz with a fractional bandwidth around 41.9%. The filter is designed on a 1.6-mm-thick FR4 substrate with dielectric constant, εr = 4.1. Filter simulations are proposed throughout the paper to validate the idea. View full abstract»

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  • Accuracy of data acquisition approaches with ground penetrating radar for subsurface utility mapping

    Page(s): 40 - 44
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (703 KB) |  | HTML iconHTML  

    Ground penetrating radar (GPR) is widely used in subsurface utility mapping for extracting the position (x, y) and depth (z) information of the utility. This information is crucial for subsurface facility management, in particular as reference in excavation works. The locational and depth information of the utility features is therefore of very important in subsurface mapping, apart from the reliability of the entire data acquisition and information retrieval method. This study investigates the effects of GPR data acquisition techniques to the locational and depth accuracy retrieved. The techniques examined are: (i) widely used perpendicular to pipe scanning; (ii) along pipe scanning; and (iii) variation angles scanning. Results indicated that along pipe scanning reported better penetrative power, higher detectability and best detection accuracy. Most importantly, this acquisition accuracy conforms to Quality Level A utility data requirements of the utility industries, hence offers the opportunities of GPR as measuring tool for underground cadastre system. View full abstract»

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  • Development of a high precision timing and control unit for Synthetic Aperture Radar

    Page(s): 45 - 48
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (662 KB) |  | HTML iconHTML  

    This paper discusses the design and development of an Field Programmable Gate Array (FPGA) based timing and control unit for high resolution Unmanned Aerial Vehicle (UAV) Synthetic Aperture Radar (SAR). The unit controls sub modules of SAR such as the timing of the chirp generator, the data acquisition module, the motion compensation module and any other modules that requires a control signal. The control signal supplied can be in the form of a signal window or a trigger pulse. View full abstract»

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  • Design and simulation of beam forming network for TACAN Radar

    Page(s): 49 - 53
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1104 KB) |  | HTML iconHTML  

    In this paper a broad band beam forming network are presented which can be used in the TACAN systems. More over the details for design and simulation are given. Results from simulation indicated that the network is suitable for broadband operation such as TACAN Radar systems (0.960-1.22 GHz). This beam forming network is design using strip line technique. The thickness of the air substrate is 320 mil. For Simulation and optimization of this beam forming network is used ADS. View full abstract»

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