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1030 documents found for International Journal
Design development and experimental validation of an EBG matrix antenna for tracking application
Hussein Abou Taam, Georges Zakka El Nashef, Eric Arnaud, Nicolas Chevalier, Bertrand Lenoir, Bernard Jecko, Mohamed Rammal
Published online : 01-02-2017
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Today's increase of functions, improvement of performances, and cost reductions required on an agile electronically scanned antenna, drive researchers to develop an innovative antennas? concept in order to deal with the proposed challenge. In this context, this article describes and demonstrates an experimental prototype to show the reliability and efficiency of the electromagnetic band gap EBG ma
Cognitive null steering in frequency diverse array radars
Sarah Saeed, Ijaz Mansoor Qureshi, Abdul Basit, Ayesha Salman, Waseem Khan
Published online : 01-02-2017
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Null steering has been a challenge in radar communications for the past few decades. In this paper, a novel cognitive null steering technique in frequency diverse array radars using frequency offset selection is presented. The proposed system is a complete implementable framework that provides precise and deep null placement in the range and angle locations of the interference source. The proposed
Design of CPW-fed tapered MIMO antenna for ISM band applications
Srimathi Mathialagan
Published online : 01-02-2017
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In this paper, an implantable coplanar waveguide-fed tapered monopole antenna for industrial scientific and medical band (2.4?2.48 GHz) applications is proposed. This proposed design has an overall dimension of 44 44 0.5 mm. The designed antenna is made compatible for implantation on human tissues such as skin, fat, or muscles by embedding it on the RT Duroid substrate and the 10 dB return los
Rotman lens combined with wide bandwidth antenna array for 60 GHz RFID applications
Ali Attaran, Rashid Rashidzadeh, Roberto Muscedere
Published online : 01-02-2017
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This paper presents a novel technique to design a Rotman lens feeding a wide bandwidth microstrip patch antenna array for 60 GHz radio frequency identification (RFID) applications. The proposed scheme supports both location positioning and increases the communication range through beam forming. The antenna array is designed using ?/4 microstrip transmission lines to support high gain, directivity,
Design of compact dual-frequency antenna with bandwidth enhancement
Liping Han, Longfei Hao, Liyun Yan, Runbo Ma, Wenmei Zhang
Published online : 01-02-2017
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A compact dual-frequency antenna with enhanced bandwidth is proposed in this paper. Dual-frequency operation is realized by cutting a slot in the elliptical patch, and bandwidth enhancement is achieved by using a partial ground plane. Compared with the conventional half-wave antenna, the antenna has a compact size of 24 20 mm, which equals to 0.38 ? 0.31 ? (?, the guided wavelength at the firs
Compact asymmetric coplanar strip fed Sinc shaped monopole antenna for multiband applications
Ritesh Kumar Badhai, Nisha Gupta
Published online : 01-02-2017
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A compact asymmetric coplanar strip fed Sinc shaped monopole antenna suitable for multifrequency operations is proposed for portable wireless devices. The proposed Sinc shaped monopole antenna with truncated half ground plane operates at three frequency bands, 2110?2380, 4180?4600, and 5200?5678 MHz, showing fractional impedance bandwidths of 12, 9, and 8.8%, respectively, suitable for Universal M
Compact dual-band bandpass filter using asymmetric stepped impedance stub loaded multimode resonator
Manimala Pal, Rowdra Ghatak, Pankaj Sarkar
Published online : 01-02-2017
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This paper presents, a dual-band bandpass filter using asymmetric stepped impedance stub loaded open loop resonator (OLR) for WLAN and WiMAX application. The outer OLR is realized to operate at lower passband of 2.45 GHz which is directly coupled to input and output ports whereas the asymmetric stepped impedance stub that loads the outer resonator contributes to 3.5 GHz passband. The introduction
Total efficiency enhancement of X-band compact choke horn antenna with circular polarization and isoflux pattern
Eric Arnaud, Luc Duchesne, Kevin Elis, Jamil Fouany, Thierry Monediere, Marc Thevenot
Published online : 01-02-2017
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This paper presents a solution to reduce the feed complexity and to improve the total efficiency of X-band compact choke horn antenna with circular polarization and isoflux pattern. This kind of antenna had been designed before by our laboratory for nanosatellite applications, but it required a 4-way divider with phase shifter which generates the insertion losses and therefore a lower realized gai
Inverted L-slot triple-band antenna with defected ground structure for WLAN and WiMAX applications
Alaknanda Kunwar, Anil Kumar Gautam, Binod Kumar Kanaujia
Published online : 01-02-2017
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To incorporate two different communication standards in a single device, a compact triple-band antenna is proposed in this paper. The proposed antenna is formed by etching an inverted L-shaped slot on the patch with defected ground structure. The antenna is targeted to excite three separate bands first from 2.39?2.51, second from 3.15?3.91, and third from 4.91?6.08 GHz that covers entire Wireless
A multilayer dual wideband circularly polarized microstrip antenna with DGS for WLAN/Bluetooth/ZigBee/Wi-Max/ IMT band applications
Amanpreet Kaur, Rajesh Khanna, Machavaram Kartikeyan
Published online : 01-03-2017
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In this paper, a three layered stacked circularly polarized rectangular dual band microstrip antenna with a defected ground structure (DGS) and a feed network with stub (showing dual wideband characteristic) is designed, fabricated, and tested for WLAN, Zig bee, Wi-Max, and IMT band applications. The proposed antenna is fabricated on an FR4 substrate with dielectric constant (?) of 4.4; tan? of 0.
MRF volume 9 issue 1 Cover and Back matter
Published online : 01-02-2017
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MRF volume 9 issue 1 Cover and Front matter
Published online : 01-02-2017
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Threshold voltage-level change in ASK demodulator related to RF input signal amplitude for the ultra-high frequency RFID passive tag
Rezvan Dastanian, Ebrahim Abiri, Khadije Taherinia
Published online : 01-02-2017
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In this paper, an amplitude shift keying (ASK) demodulator with 100% modulation depth is proposed. In order to achieve the higher power and wider reading range the designed ASK demodulator works in the ultra-high frequency. In this design, the average detector and voltage divider are used in order to define the appropriate threshold voltage level for the radio frequency input signal which leads to
An 850 nm SiGe/Si HPT with a 4.12 GHz maximum optical transition frequency and 0.805A/W responsivity
Zerihun Gedeb Tegegne, Carlos Viana, Marc D. Rosales, Julien Schiellein, Jean-Luc Polleux, Marjorie Grzeskowiak, Elodie Richalot, Catherine Algani
Published online : 01-02-2017
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A 10 10 ?m SiGe heterojunction bipolar photo-transistor (HPT) is fabricated using a commercial technological process of 80 GHz SiGe bipolar transistors (HBT). Its technology and structure are first briefly described. Its optimal opto-microwave dynamic performance is then analyzed versus voltage biasing conditions for opto-microwave continuous wave measurements. The optimal biasing points are the
Switchable bandpass filter using CRLH cells based on a new kind of admittance inverter
Samaneh Keshavarzi, Zahra Atlasbaf
Published online : 01-02-2017
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In this paper, a new kind of admittance inverter and design of a switchable microstrip bandpass filter using composite right/left-handed (CRLH) cells has been presented. The proposed filter has two states (or passbands). One of the two passbands, is accessible at each time by on/off state of three PIN diodes. This filter is a three-pole, coupled resonator filter, composed of short-circuited shunt
Phase shift combiner for multi-channel VHF communication
E. Holdengreber, M. Mizrahi, E. Glassner, Y. Koral, S.E. Schacham, E. Farber
Published online : 01-02-2017
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The growing demand for communication systems requires multi-channel solutions. However, the number of antennas in communication systems is dictated by the number of channels in each system which is limited by the available space on a broadcasting platform and by the limited available resources. We have developed a Multi-Channel Phase Control coupler in the VHF frequency range enabling a reduction
Polarization-independent single-layer ultra-wideband frequency-selective surface
Ramprabhu Sivasamy, Balaji Moorthy, Malathi Kanagasabai, Jithila V. George, Livya Lawrance, Dinesh Babu Rajendran
Published online : 01-02-2017
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An ultra-wideband (UWB) frequency-selective surface (FSS) exhibiting band rejection characteristic is presented in this paper. The proposed unit cell has the size of 14 14 mm which is approximately 0.18 0.18 ?, where ? corresponds to free space wavelength at the lower cut-off frequency. The proposed UWB FSS consists of a single-layer substrate and provides 20 dB attenuation level for a wide ba
A planar microwave phase shifter using microstrip?CPW?microstrip transition with defected ground structures
Indhumathi Kulandhaisamy, Malathi Kanagasabai, Indira Gandhi Sannasi, Srivastav ArunKumar, Gulam Nabi Alsath
Published online : 01-02-2017
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A novel planar printed phase shifter design is proposed in this paper. The design is developed with microstrip?conductor-backed coplanar waveguide? microstrip (MP?CBCPW?MP) transition line with different defected ground structures (DGS). The differential phase shift can be controlled by altering the DGS dimensions. Three prototypes with DGS dimensions 5 10, 10 20, and 10 30 mm, are employed
Switchable square ring bandpass to bandstop filter for ultra-wideband applications
Mushtaq Alqaisy, Chandan K. Chakrabraty, Jawad K. Ali, Adam Reda Alhawari, Tale Saeidi
Published online : 01-02-2017
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In this manuscript, serial-shunt of square ring resonators with step-impedance open circuited stub resonators to produce a new on-off switchable bandpass to bandstop response in the same ultra-wideband microstrip filter structure is proposed. The closed ring of series-shunt square ring resonators with a combine stubs are introduced to excite the bandpass response while bandstop characteristic exci
Data-rate-efficient CMOS modulator for wireless biomedical sensor network applications
Kai-Wen Yao, Cihun-Siyong Alex Gong, Yu-Ting Hsueh, Yu-Lin Tsou, Muh-Tian Shiue, Jian-Chiun Liou, Yih-Shiou Hwang
Published online : 01-02-2017
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A 0.18 m CMOS Binary Frequency Shift Keying Modulator with a novel frequency synthesizer structure is proposed in this paper. Based on an analog adder technique being the backbone of the synthesizer, this prototype demonstrates a compact modulator with low complexity, which achieves 1 Mbps at 400 MHz while dissipating 3.1 mW at 1.5 V supply. The proposed design is ideal for biomedical sensor netw
Accurate and efficient study of substrate-integrated waveguide devices using iterative wave method
Jamel Ben Romdhan Hajri, Hafedh Hrizi, Noureddine Sboui
Published online : 01-02-2017
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This paper proposes an efficient and fast analysis of substrate integrated waveguide (SIW) components using a new approach of the iterative method called WCIP, i.e. ?Wave Concept Iterative Process?. This method is based on the iterative resolution of waves between two domains. The first is the spectral domain. We use the Floquet?Bloch decomposition to describe all modes in the spectral domain. The
Tunable multiport system for measurement of two-port scattering parameters
Kamil Staszek, Slawomir Gruszczynski, Krzysztof Wincza
Published online : 01-02-2017
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A novel multiport system, allowing for measurements of scattering parameters in over-two-octave frequency range is proposed. It is composed of two directional couplers and a standard 4 4 Butler matrix, and does not require any isolators. The presented system features a uniform power distribution providing the high precision of measurements, which can be further enhanced by a simple adjustment of
A compact rhombus-shaped slot antenna fed by microstrip-line for UWB applications
Richa Chandel, Anil Kumar Gautam, Binod Kumar Kanaujia
Published online : 01-03-2017
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In this paper, a novel design and experimental study of microstrip-line-fed rhombus-shaped slot antenna is presented. The proposed antenna shows an ultra-wide band (UWB) operation with good impedance matching by choosing appropriate rhombus-shaped slot and feeding structure. The proposed antenna has a simple structure and compact size as compared with many reported antennas. The measured results v
Performance study of a 248 GHz voltage controlled hetero-integrated source in InP-on-BiCMOS technology
Maruf Hossain, Ina Ostermay, Nils G. Weimann, Franz Josef Schmueckle, Johannes Borngraeber, Chafik Meliani, Marco Lisker, Bernd Tillack, Olaf Krueger, Viktor Krozer, Wolfgang Heinrich
Published online : 01-03-2017
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This paper presents the performance study of a 248 GHz voltage-controlled hetero-integrated signal source using indium phosphide (InP)-on-bipolar complementary metal-oxide-semiconductor (BiCMOS) technology. The source consists of a voltage controlled oscillator (VCO) in 0.25 m BiCMOS technology and a frequency multiplier in 0.8 m transferred-substrate InP-heterojunction bipolar transistor techno
Wideband four-element two-segment triangular dielectric resonator antenna with monopole-like radiation
Ravi Kumar Gangwar, Pinku Ranjan, Abhishek Aigal
Published online : 01-03-2017
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In this paper, a wideband two-segmented four-element triangular dielectric resonator antenna (TDRA) with coaxial probe feed has been proposed. The proposed antenna has been analyzed, optimized, and studied through Ansoft HFSS simulation software. The prototype of the proposed antenna has been fabricated and its input characteristics are measured with the help of R&S Vector Network Analyzer. Good a
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