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Articles 1 - 22 of 22
Full-Text Articles in Electronic Devices and Semiconductor Manufacturing
Multi-Hole Waveguide Directional Couplers, Mahmoud Moghavvemi, Hossein Ameri Mahabadi, Farhang Alijani
Multi-Hole Waveguide Directional Couplers, Mahmoud Moghavvemi, Hossein Ameri Mahabadi, Farhang Alijani
Hossein Ameri Mahabadi
1. Introduction The directional couplers are inherently assumed as four-port devices, which consisted of two transmission lines that are electromagnetically coupled to each other. The first port is named as input, and the second one as output or transmitted, the third one as sampling or coupled and the fourth one as isolated or terminated. By using a special design the input power is divided between output and coupled port in a certain ratio named coupling factor. The required value for coupling factor P1/P3 defines the range of applications for directional couplers. Based on the application, coupling factor could be any …
Itex2012 Gold Medal, Prof.Dr. Mahmoud Magha Vvemi, Hossein Ameri Mahabadi, Aliyar Attaran
Itex2012 Gold Medal, Prof.Dr. Mahmoud Magha Vvemi, Hossein Ameri Mahabadi, Aliyar Attaran
Hossein Ameri Mahabadi
This is to certify that PROF.DR. MAHMOUD MAGHA VVEMI, HOSSEIN AMERI, ALIYAR ATTARAN has been awarded the ITEX GOLD MEDAL for the invention SIGNAL INTEGRITY ENHANCEMENT IN C-BAND RADIO LINK SYSTEM CONSIDERING JITTER AND PHASE PRECISION at the 23rd International Invention, Innovation & Technology Exhibition ITEX2012 Kuala Lumpur, Malaysia 17th_ 19th May 2012
Planning Of Low-Cost 77-Ghz Radar Transceivers For Automotive Applications, Hossein Ameri Mahabadi, A. Attaran, M. Moghavvemi
Planning Of Low-Cost 77-Ghz Radar Transceivers For Automotive Applications, Hossein Ameri Mahabadi, A. Attaran, M. Moghavvemi
Hossein Ameri Mahabadi
The key to prevent driving accidents by automotive radar systems at high speed is to have optimum and accurate estimation of position representation and fast visualization of the environment.
Fabricate An 8.35-Ghz Frequency Synthesizer, A. Attaran, Hossein Ameri Mahabadi, M. Moghavvemi
Fabricate An 8.35-Ghz Frequency Synthesizer, A. Attaran, Hossein Ameri Mahabadi, M. Moghavvemi
Hossein Ameri Mahabadi
The article presents information on designing a low-noise frequency synthesizer for achieving low-phase-noise outputs past 8 GHz for digital microwave radios (DMRs). These synthesizers can be used with the DMRs, depending on advanced digital modulation such as quadrature-amplitude-modulation (QAM) and quadrature-phase-shift-keying (QPSK) formats.
Exposing To Emf, Mahmoud Moghavvemi, Farhang Alijani, Hossein Ameri Mahabadi, Maryami Ashayer Soltan
Exposing To Emf, Mahmoud Moghavvemi, Farhang Alijani, Hossein Ameri Mahabadi, Maryami Ashayer Soltan
Hossein Ameri Mahabadi
No abstract provided.
Assembly Of Low Phase Noise Sub-Millimeter Wave Local Oscillator In Ku Band Frequency, M. Moghavvemi, Hossein Ameri Mahabadi, A. Attaran
Assembly Of Low Phase Noise Sub-Millimeter Wave Local Oscillator In Ku Band Frequency, M. Moghavvemi, Hossein Ameri Mahabadi, A. Attaran
Hossein Ameri Mahabadi
A design and fabrication of a dual-band synthesizer device is presented in this paper. The noise analysis in synthesizer loop block component is modeled individually. The Design methodology is elaborated along with the test results. The initial frequency synthesizer in 1.8-2.4GHz frequency range (L and S-band) is designed and it is multiplied by 8. Microstrip bandpass filters (LFCN) are used to filter out the spurious frequency contents; the final output frequency is 14-20GHz (Ku-band). Phase noise investigation, design steps, filter assembling of 14-20GHz synthesizer is presented in this paper.
Novel Client Booking System In Klcc Twin Tower Bridge, Hossein Ameri Mahabadi, R. Ameri
Novel Client Booking System In Klcc Twin Tower Bridge, Hossein Ameri Mahabadi, R. Ameri
Hossein Ameri Mahabadi
This system should help managing the visitors and tour guides as well as scheduling tours to visit “Petronas Twin Towers Sky Bridge”. The system should at least support the following characteristics. It should keep track of visitors and or tourists. It should keep information about tour guides and their working hour and other related information about such employees. The administrators should be able to schedule their visiting hours. This is a work-flow system and it need to keep track of daily visitors. The requirement was meant for this system is straight forward and very clear with so little complexity. On …
A Compact Analytical Design Of Dual-Loop 18 Ghz Frequency Synthesizer To Enhance Signal Reliability In Digital Millimeter Radio Link System, M. Moghavvemi, Hossein Ameri Mahabadi, A. Attaran
A Compact Analytical Design Of Dual-Loop 18 Ghz Frequency Synthesizer To Enhance Signal Reliability In Digital Millimeter Radio Link System, M. Moghavvemi, Hossein Ameri Mahabadi, A. Attaran
Hossein Ameri Mahabadi
In this paper a high resolution dual-loop 17.7–19.7 GHz frequency synthesizer is presented which is compatible with ITU-R (F.595-6) standards. The investigations of phase noise and spur frequency contents are discussed in detail. The simulated and measured phase noise and spur frequency contents are similar to one another. Phase noise of –81 dBc/Hz in 17.7 GHz at 10 KHz offset frequency is measured by (HP8560) series Spectrum analyzer and it matches with predicted measurements.
Multifrequency Wilkinson Power Divider Using Microstrip Nonuniform Transmission Lines, M. Khalaj-Amirhossein, M. Moghavvemi, Hossein Ameri Mahabadi
Multifrequency Wilkinson Power Divider Using Microstrip Nonuniform Transmission Lines, M. Khalaj-Amirhossein, M. Moghavvemi, Hossein Ameri Mahabadi
Hossein Ameri Mahabadi
A new idea is proposed to modify the conventional Wilkinson power dividers to operate at two or several desired frequencies. The proposed structure contains two Microstrip Nonuniform Transmission Lines (MNTLs) instead of two uniform ones with nearly the same length at the minimum frequency. The strip width of MNTLs is considered variable and is written as a truncated Fourier series. Three nonuniform power dividers are designed and one of them operating at frequencies 1.0, 2.8, and 4.5 GHz is fabricated and measured. The measured results of the fabricated diplexer have a good agreement with the theoretical results.
Body-Biased Vco Tunes 12 To 16 Ghz, M. Moghavvemi, Hossein Ameri Mahabadi, A. Attaran
Body-Biased Vco Tunes 12 To 16 Ghz, M. Moghavvemi, Hossein Ameri Mahabadi, A. Attaran
Hossein Ameri Mahabadi
This body-biased voltage-controlled oscillator provides reasonably good phase-noise performance over a broad tuning range with relatively low power consumption and low jitter timing noise in the time domain.
Microstrip Diplexers With Double-Stub Bandpass Filters, M. Khalaj-Amirhosseini, M. Moghavvemi, Hossein Ameri Mahabadi, A. Attaran
Microstrip Diplexers With Double-Stub Bandpass Filters, M. Khalaj-Amirhosseini, M. Moghavvemi, Hossein Ameri Mahabadi, A. Attaran
Hossein Ameri Mahabadi
This paper presents a microstrip diplexer using two Double-Stub Band-Pass Filters (DS-BPFs), composed of several double-stubs connected to a main microstrip line. Each DS-BPF has a null at the center frequency of the other. Therefore, these types of filters are suitable for diplexers with two near frequencies. A diplexer at frequencies 5.875 and 6.225 GHz is designed, fabricated and measured. Measured results of the fabricated diplexer have a good agreement with the calculated results.
Design A Stable 14-To-20-Ghz Source, M. Moghavvemi, A. Attaran, Hossein Ameri Mahabadi
Design A Stable 14-To-20-Ghz Source, M. Moghavvemi, A. Attaran, Hossein Ameri Mahabadi
Hossein Ameri Mahabadi
Careful selection of key components and the use of straightforward multiplication schemes can be applied to the design of a low-noise frequency synthesizer for Ku-band signals to 20 GHz.
Design An X-Band Frequency Synthesizer, Hossein Ameri Mahabadi, A. Attaran, M. Moghavvemi
Design An X-Band Frequency Synthesizer, Hossein Ameri Mahabadi, A. Attaran, M. Moghavvemi
Hossein Ameri Mahabadi
This frequency synthesizer design aims at achieving low phase and high reliability for X-band digital microwave radio applications, using a commercial device and frequency tripling techniques.
Electromagnetic Solutions For The Agricultural Problems, Hadi Aliakbarian, Amin Enayati, Maryam Ashayer Soltani, Hossein Ameri Mahabadi, Mahmoud Moghavvemi
Electromagnetic Solutions For The Agricultural Problems, Hadi Aliakbarian, Amin Enayati, Maryam Ashayer Soltani, Hossein Ameri Mahabadi, Mahmoud Moghavvemi
Hossein Ameri Mahabadi
Introduction In the recent years, interactive relations between various branches of science and technology have improved interdisciplinary fields of science. In fact, most of the research activities take place somewhere among these branches. Therefore, a specialist from one branch usually can propose novel methods, whenever enters a new field, based on his previous knowledge. Taking a look at the extensive problems in the field of agriculture, an expert in the field of Electromagnetic waves can easily suggest some innovative solutions to solve them. The major suffering problems with which a farmer faces are the damages caused by the harmful pests …
Application Of Electromagnetic Waves As A Solution To Some Agricultural Problems, B. M. Ida Idayu, Maryam Ashayer Soltani, Amin Enayati, H. Aliakbarian, Hossein Ameri Mahabadi, M. Moghawemi
Application Of Electromagnetic Waves As A Solution To Some Agricultural Problems, B. M. Ida Idayu, Maryam Ashayer Soltani, Amin Enayati, H. Aliakbarian, Hossein Ameri Mahabadi, M. Moghawemi
Hossein Ameri Mahabadi
A review of some applications of electromagnetic waves in agriculture is presented. There are many applications in the literature which are categorized in two sections of post-harvest indoor and pre-harvest outdoor applications. Taking a look at the applications suggested, there are still works to be done to industrialize the method. However, the proposed method is promising in special cases when the cost and hazards of other methods are high.
Novel Biconical Antenna Configuration With Directive Radiation, M. Shahpari, F. H. Kashani, Hossein Ameri Mahabadi
Novel Biconical Antenna Configuration With Directive Radiation, M. Shahpari, F. H. Kashani, Hossein Ameri Mahabadi
Hossein Ameri Mahabadi
In this paper a novel biconical antenna geometry has been proposed that has directive radiation pattern, higher gain and enhanced front to back ratio. Wide band performance is another characteristic of this new antenna.
Assemble A Ku-Band Frequency Synthesizer, Hossein Ameri Mahabadi, M. Moghavvemi
Assemble A Ku-Band Frequency Synthesizer, Hossein Ameri Mahabadi, M. Moghavvemi
Hossein Ameri Mahabadi
This straightforward design shows how to assemble commercial components into a low-noise 14.4-to-15.5-GHz frequency synthesizer with 625-kHz tuning steps for digital microwave radio systems.
Dual Band Dual Polarized Antenna With High Efficiency For Base Transceiver Stations, F. H. Kashani, M. Shahpari, Hossein Ameri Mahabadi
Dual Band Dual Polarized Antenna With High Efficiency For Base Transceiver Stations, F. H. Kashani, M. Shahpari, Hossein Ameri Mahabadi
Hossein Ameri Mahabadi
In this paper new array element for use in dual band dual polarized antenna will be introduced that has high efficiency (more than 95%) and has high isolation in both 900MHz and 1800MHz bands. Also radiation pattern of this antenna is according to IEC recommendation.
A Novel Bandpass Waveguide Filter Structure On Siw Technology, Z. Sotoodeh, B. Biglarbegian, F. Hojat Kashani, Hossein Ameri Mahabadi
A Novel Bandpass Waveguide Filter Structure On Siw Technology, Z. Sotoodeh, B. Biglarbegian, F. Hojat Kashani, Hossein Ameri Mahabadi
Hossein Ameri Mahabadi
Taking the advantage of common waveguide filters and SIW technology, a new filter structure is proposed.This structure can be implemented for various microwave frequencies by choosing appropriate low loss substrates.An example of suggested structure in Ku band is presented in this paper.The filter is designed and simulated on a low loss RT/Duroid 5880 laminate.The resulted filter has a Quality factor around 150.The main advantage of the structure is low size and cost, simplicity in fabrication, and the ability of integration with other elements of the circuit
Agricultural Applications For Electromagnetic Exposure, H. Aliakbarian, A. Enayati, Hossein Ameri Mahabadi, M. Ashayer Soltani
Agricultural Applications For Electromagnetic Exposure, H. Aliakbarian, A. Enayati, Hossein Ameri Mahabadi, M. Ashayer Soltani
Hossein Ameri Mahabadi
Despite the advances in bug controlling and antifreezing operations of agricultural products, the devastation of Sunne pests and freezing is still enormous. Traditional treatments such as chemical insecticides for bug controlling and covering to avoid freezing have not been sufficient. In the presented paper, new ideas of using electromagnetic treatment for anti-freezing operation, pre-harvest Sunne pest control, and Orchid flower control are introduced.
A Low-Phase-Noise 18-Ghz-Band Frequency Synthesizer With Low Frequency Step Size, B. Biglarbegian, F. Hodjat Kashani, Hossein Ameri Mahabadi
A Low-Phase-Noise 18-Ghz-Band Frequency Synthesizer With Low Frequency Step Size, B. Biglarbegian, F. Hodjat Kashani, Hossein Ameri Mahabadi
Hossein Ameri Mahabadi
Due to development of both wireless communication users and communication line users, utilization of high-speed communications has become a vital essence. High speed digital microwave radios have a great contribution in wireless telecommunications. Having a different and high capacitance, these radios can transmit and receive data in point to point links in far distances up to 30 km. Considering the high rate of utilization such digital microwave radios have in lower bands, it is imperative to utilize such kind of radios in upper bandsfor accessing more channels. One of the radios that plays a significant role in communications is digital …
Gain Enhancement Of Dielectric Resonator Loaded Waveguide Antennas With Dielectric Overlays, M. Hakkak, Hossein Ameri Mahabadi
Gain Enhancement Of Dielectric Resonator Loaded Waveguide Antennas With Dielectric Overlays, M. Hakkak, Hossein Ameri Mahabadi
Hossein Ameri Mahabadi
The gain characteristics of a dielectric resonator loaded coaxial probe fed circular waveguide antenna (DRLWA) with overlaying parasitic discs have been investigated experimentally. Results indicate that, when properly spaced, the overlays can enhance the gain by more than 6 dB.