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940 documents found for International Journal
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
Design of dual band-notched lamp-shaped antenna with UWB characteristics
Swati Yadav, Anil Kumar Gautam, Binod Kumar Kanaujia
Published online : 01-03-2017
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To restrict electromagnetic interference at WiMAX (3.3?3.7GHz) and wireless local area network (WLAN) (5.15?5.825GHz) bands operating within ultra wide bandwidth (UWB) band, a novel design of lamp-shaped UWB microstrip antenna with dual band-notched characteristics is presented. The proposed antenna is composed of a lamp-shaped radiating patch with two rectangular ground planes on both the sides
Novel star-shaped fractal antenna for multiband applications
Neeraj Rao, Ankit Malik, Rahul Kumar, Shobhit Goel, Dinesh Kumar V
Published online : 01-03-2017
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Fractals have unique properties such as self-similarity and space-filling. The use of fractal geometry in antenna design provides a good method for achieving the desired miniaturization, multi-band, and wideband properties. In this communication, novel fractal geometry is proposed based on which a multiband antenna is designed. The proposed antenna has fractal patches which are shaped as different
Dual/wideband hybrid DRA with reconfigurable operation
Ravi Dutt Gupta, Manoj Singh Parihar
Published online : 01-03-2017
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In this paper, a rectangular dielectric resonator antenna (DRA) with a parasitic gap-coupled microstrip resonator (MSR) is investigated; analytically, and experimentally. The proposed antenna uses an open-ended half-wavelength MSR patch as a hybrid radiator. Radiating modes are identified for both the radiators. Two separate and fully independent modes are merged together to get an enhanced bandwi
MEMS-based LC tank with extended tuning range for low phase-noise VCO
Alessandro Cazzorla, Paola Farinelli, Laura Urbani, Fabrizio Cacciamani, Luca Pelliccia, Roberto Sorrentino, Flavio Giacomozzi, Benno Margesin
Published online : 01-03-2017
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This paper presents the modeling, manufacturing, and testing of a micro-electromechanical system (MEMS)-based LC tank resonator suitable for low phase-noise voltage-controlled oscillators (VCOs). The device is based on a variable MEMS varactor in series with an inductive coplanar waveguide line. Two additional parallel stubs controlled by two ohmic MEMS switches have been introduced in order to in
Dual-band-notched antenna for UWB MIMO applications
Zamir Wani, Dinesh Kumar
Published online : 01-03-2017
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In this report, a compact antenna system with dual-band-notched characteristics is proposed for ultra-wideband (UWB) multiple-input multiple-output (MIMO) applications. Two antenna elements are placed side by side and fed with matched microstrip lines on a substrate with an area of 35 30 mm. Notched characteristics at WiMAX (3.4?3.6 GHz) and WLAN (5.725?5.825 GHz) have been achieved using comple
CPW-fed circular-shaped fractal antenna with three iterations for UWB applications
Sarthak Singhal, Ankit Pandey, Amit Kumar Singh
Published online : 01-03-2017
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A coplanar waveguide (CPW)-fed circular-shaped fractal antenna with third iterative orthogonal elliptical slot for ultra-wideband applications is presented. The bandwidth is enhanced by using successive iterations of radiating patch, CPW feedline, and tapered ground plane. An impedance bandwidth of 2.9?20.6 GHz is achieved. The designed antenna has omnidirectional radiation patterns along with ave
Wideband dipole antenna using multi-mode resonance concept
Wen-Jun Lu, Lei Zhu, Kam Weng Tam, Hong-Bo Zhu
Published online : 01-03-2017
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Wideband dipole antennas are proposed using the multi-mode resonance concept. By symmetrically introducing one-pair or two-pair of stubs at the nulls of current distribution of the second odd-order mode, two radiation modes are excited in a single, center-fed dipole resonator. Using these stubs, the second odd-order mode gradually moves down to its first counterpart, resulting to achieve a wideban
Novel compact dual-band-notched ultra-wideband printed antenna with a parasitic circular ring strip
Zhijun Tang, Xiaofeng Wu, Zaifang Xi, Shigang Hu
Published online : 01-03-2017
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A simple and compact printed ultra-wideband antenna with dual-band-notched characteristics is presented. The proposed antenna is composed of a rectangular patch and a modified ground plane. The rectangular patch is etched onto a lossy FR4 substrate. A circular ring strip parasitizes the rectangular patch embedded by a U-shaped slot. Two inverted-L slits and a rectangular slit are embedded onto the
Reduction of the mutual coupling in patch antenna arrays based on EBG by using a planar frequency-selective surface structure
Ehsan Beiranvand, Majid Afsahy, Vahid Sharbati
Published online : 01-03-2017
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This paper describes a new configuration of frequency-selective structure (FSS) structures to reduce mutual coupling between the radiating elements. Also, the antenna performance before and after the implementation of FSS have been investigated. The proposed configuration provides an improvement in mutual coupling by 14 dB (measured value) with a reduced edge-to-edge spacing of 23 mm. The reductio
Dual-band linearly and circularly polarized microstrip patch antennas with meandering slot and metallic vias
Jin Zhang, Xianqi Lin, Jiawei Yu, Liying Nie
Published online : 01-03-2017
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Patch antennas with a meandering slot and different distributions of grounded metallic vias are presented in this paper. The meandering slot is adopted to stimulate dual-band operation, while the number and position of the grounded metallic vias are suggested to achieve different radiation performances. The characteristics are analyzed in detail where we find that the existence of the vias also im
Design of a CPW-fed UWB printed antenna with dual notch band using mushroom structure
Tapan Mandal, Santanu Das
Published online : 01-03-2017
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A coplanar waveguide-fed planar hexagonal monopole ultra-wideband antenna with dual-band rejection characteristics is proposed in this paper. The desired notch frequencies at 3.5 and 5.5 GHz are realized by incorporating mushroom structures. The input impedance and surface current distributions are used for analysis and explanation of the effects of mushroom cells. The prototype and proposed anten
A planar multiband Koch snowflake fractal antenna for cognitive radio
S. Sivasundarapandian, C.D. Suriyakala
Published online : 01-03-2017
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This paper of lettering reveals about a modified Koch snowflake fractal multiband antenna for cognitive radio applications. Multiband antennas can be employed for spectrum sensing in cognitive radio. This new microstrip-modified Koch fractal antenna exhibits multiple actions in four dissimilar resonant frequencies at 3.2, 5.2, 6, and 9.5 GHz correspondingly that covers the frequency bands such as
Compact modified circular patch quad-band MIMO antenna with high isolation and low correlation
Chithradevi Rajagopal, Nafiza Noorullakhan, Sreeja Balakrishnapillai Suseela, Radha Sankararajan
Published online : 01-04-2017
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A compact quad band slot antenna with high isolation suitable for multiple-input?multiple-output (MIMO) applications is developed. The quad bands are achieved by introducing slots in a modified, size reduced circular patch antenna. The single-antenna element consists of a substrate sandwiched between a modified circular patch with F shape slot, a feeder line and a via running between the radiating
UWB MIMO antenna with common radiator
Garima Srivastava, B. K. Kanuijia, Rajeev Paulus
Published online : 01-04-2017
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A compact printed 2 2 ultrawideband UWB multiple input multiple output MIMO antenna with a single circular patch as a common radiator for both the antenna elements is presented in this paper. A single circular patch is excited by two tapered CPW feeds for dual polarization. To improve the isolation between two ports, a rectangular slot of dimension L W is created in the radiator. The UWB MIMO
MRF volume 9 issue 2 Cover and Back matter
Published online : 01-02-2017
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