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967 documents found for International Journal
Highly compact UWB bandpass filter based on composite right/left-handed transmission line and meander fractal like ring slot in ground
Babu Lal Shahu, Srikanta Pal, Neela Chattoraj, Dileep Kumar Upadhyay
Published online : 01-06-2017
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An ultra-wideband (UWB) highly compact bandpass filter with extremely high passband bandwidth is presented. The proposed structure is made using three-staged stepped-impedance lines and a composite right/left-handed transmission line (CRLH-TL) synthesized with meander fractal like ring slot in the ground and series capacitive gap in conductor strip. The capacitive gap in conductor strip and meande
Countering method for active jamming based on dual-polarization radar seeker
Qiang Zhang, Weijun Pan
Published online : 01-06-2017
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In order to counter active jamming, an adaptive polarization cancellation method based on dual-polarization radar is proposed in the paper. First, respectively being obtained by vertical and horizontal polarization channels of dual-polarization radar, the signals from the real target and active jamming are analyzed in composition and characteristic. Then, the weight coefficient is timely derived i
Compact hybrid fractal antenna for wideband wireless applications
Yogesh Kumar Choukiker, Jagadish Chandra Mudiganti
Published online : 01-06-2017
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A compact size hybrid fractal antenna is proposed for the application in wideband frequency range. The proposed antenna structure is the combination of Koch curve and self-affine fractal geometries. The Koch curve and self-affine geometries are optimized to achieve a wide bandwidth. The feed circuit is a microstrip line with a matching section over a rectangular ground plane. The measured impedanc
Design of differential-mode bandpass filter with common-mode suppression using ring dielectric resonator
Jugul Kishor, Binod K. Kanaujia, Santanu Dwari, Ashwani Kumar
Published online : 01-06-2017
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Synthesis of differential-mode bandpass filter (BPF) with good common-mode suppression has been described and demonstrated on the basis of ring dielectric resonator (RDR) for high-performance communication system. A RDR with two pairs of feeding lines has been used to excite TE-mode. This unique combination of feeding lines and the ring resonator creates a differential passband. Meanwhile, TM-mode
Waveguide T-junctions with resonant coupling between sections of different dimensions
Sergey L. Berdnik, Victor A. Katrich, Mikhail V. Nesterenko, Yuriy M. Penkin
Published online : 01-06-2017
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Electromagnetic characteristics of the E-plane T-junction for two rectangular waveguides using resonant coupling between the waveguide sections were studied by mathematical modeling. The problem of coupling between infinite and semi-infinite rectangular waveguides through a resonant slot in the end-wall of the semi-infinite waveguide in the presence of resonant monopole is solved in a strict elect
A CPW-fed tapered slot antenna with improved time and frequency domain characteristics
Alireza Hokmabadi, Asghar Keshtkar, Alireza Bayat, Ahmad Keshtkar
Published online : 01-06-2017
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In this paper, a miniaturized CPW-fed tapered slot antenna (TSA) with a modified CPW to slot-line transition structure was introduced. An air-bridge and tapered slot edge (TSE) structure was also employed to broaden the transition bandwidth. Through these applied modifications, negative features of the original TSA (limitation of transition) and antipodal Vivaldi antenna (bad cross-polarization) a
Enhancement of the gain and bandwidth of the microstrip patch antenna with modified ground plane
Kalyan Mondal, Partha Pratim Sarkar
Published online : 01-06-2017
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In this work, microstrip antenna with W- and V-shaped radiating patches have been proposed. Here square- and circular-shaped modified ground planes have been designed by poly tetra fluoro ethylene (PTFE) substrate with dielectric constant 2.4. Broadband with high gain is obtained by optimum selection of radiating patch with modified ground plane. The ground planes are modified by loading a U-shape
Performance parameters prediction of slotted microstrip antennas with modified ground plane using support vector machine
Chandan Roy, Taimoor Khan, Binod Kumar Kanaujia
Published online : 01-06-2017
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Artificial neural networks (ANNs) have acquired enormous importance in computing of the performance parameters of microstrip antennas due to their generalized and adaptive features. However, recently the concept of support vector machines (SVMs) has become very much popular in performance parameters computation due to several attractive features over ANNs. Specifically, SVMs outreach ANNs noticeab
A miniature tri-band RFID reader antenna with high gain for portable devices
Bo Wang, Wenqing Wang
Published online : 01-06-2017
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This paper presents a miniature monopole reader antenna for tri-band radio frequency identification (RFID) portable devices. The proposed antenna operates at the main RFID frequencies and can alleviate and compensate for the shortcomings of a single-band antenna. An additional rectangular stub couples with the bent monopole antenna, allowing the latter to resonate at the RFID bands at 902?928 MHz,
Editorial
Ian Hunter, Alaa Abunjaileh, Laith Danoon
Published online : 01-09-2017
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MRF volume 9 issue 6 Cover and Back matter
Steve Nightingale, Alaa Abunjaileh, Laith Danoon
Published online : 01-09-2017
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MRF volume 9 issue 6 Cover and Front matter
Steve Nightingale, Alaa Abunjaileh, Laith Danoon
Published online : 01-09-2017
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Prediction of odd-mode instabilities under output mismatch effects
Almudena Suárez, Franco Ramírez, Sergio Sancho
Published online : 01-07-2017
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A methodology is presented to predict odd-mode instability in power amplifiers under output mismatch effects, as in the case of amplifiers connected to an antenna. This kind of instability is often observed in multi-device configurations, due to their symmetry properties. Unlike the single-ended situation, there is a cancellation of odd multiples of the oscillation frequency at the circuit output,
Bitstream radar waveforms for generic single-chip radar
Øystein Bjørndal, Svein-Erik Hamran, Tor Sverre Lande
Published online : 01-07-2017
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Bitstreams, square wave digital signals, enable flexible radar implementations in modern digital technology. By using bitstreams in place of analog sinusoidal waveforms, we can realize continuous-wave (CW), stepped-frequency CW, frequency-modulated CW, or even pseudo random noise-sequence and pulsed radars, all with a single bit of amplitude resolution. The building blocks are a programable wavefo
A new modulator for digital RF power amplifiers utilizing a wavetable approach
Florian Hühn, Andreas Wentzel, Wolfgang Heinrich
Published online : 01-07-2017
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This paper presents for the first time a wavetable-based coding scheme to generate a high-speed binary input signal for digital RF power amplifiers. The approach maximizes the utilization of the time domain handling capabilities of the pulse forming circuit. Key features are a greatly improved output spectrum purity in comparison with common digital modulators, the ability to adjust the modulator
Recognition of jet engines via sparse decomposition of ISAR images using a waveguide scattering model
Simon Wagner, Joachim Ender
Published online : 01-07-2017
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Air target recognition is a critical step in the radar processing chain and reliable features are necessary to make a decision. The number and position of jet engines are useful features to perform a pre-classification and give a list of possible targets. To extract these features, a sparse decomposition framework for inverse synthetic aperture radar (ISAR) images is presented. With this framework
Waveform diversity for SAR ECCM based on random phase and code rate transition
Kee-Woong Lee, Woo-Kyung Lee
Published online : 01-07-2017
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In this paper, we propose an effective waveform diversity scheme that can be applicable to synthetic aperture radar (SAR) operations affected by interfering signals. A novel approach is taken to achieve fully adaptive SAR waveform diversity that generates sufficient number of orthogonal signals with modest performance trade-off. To this purpose, multiple phased-code waveforms are arbitrarily gener
Broadband sub-THz spectroscopy modules integrated in 65-nm CMOS technology
Marion K. Matters-Kammerer, Dave Van Goor, Lorenzo Tripodi
Published online : 01-07-2017
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The design and characterization of a broadband 20?480 GHz continuously tuneable on-chip spectrometer based on non-linear transmission lines in 65-nm CMOS technology is presented. The design procedure of the sampler that detects the ultra-broadband signal from the transmitter in time and frequency domain is described in detail. It consists of a non-linear transmission line, a passive pulse differen
Development of a 70 MHz unit for hyperthermia treatment of deep-seated breast tumors
Johannes Crezee, Geertjan Van Tienhoven, Merel W. Kolff, Jan Sijbrands, Gerard Van Stam, Sabine Oldenborg, Elisabeth D. Geijsen, Maarten C.C.M. Hulshof, Henny P. Kok
Published online : 01-07-2017
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A dedicated hyperthermia (HT) system was designed for tumors in intact breast extending beyond the heating depth of our superficial 434 MHz antennas, consisting of a treatment bed fitted with a 50 cm × 40 cm × 16 cm temperature controlled open water bolus. The patient lies in prone position with the breast immersed in the water positioned in front of a 34 cm × 20 cm 70 MHz waveguide operating in t
Efficient 2-D leaky-wave antenna configurations based on graphene metasurfaces
Walter Fuscaldo, Paolo Burghignoli, Paolo Baccarelli, Alessandro Galli
Published online : 01-07-2017
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Different configurations of leaky-wave antennas (LWAs) based on graphene metasurfaces are studied. The electronic properties of a graphene metasurface in the low THz range are investigated in details in order to discuss the reconfigurability features of the presented structures. Simple exact formulas for evaluating the ohmic losses related to the surface plasmon polariton (SPP) propagation along a
A 0.4?3-GHz nested bandpass filter and a 1.1?1.7-GHz balun bandpass filter using tunable band-switching technique
Keiichi Motoi, Naoki Oshima, Masaki Kitsunezuka, Kazuaki Kunihiro
Published online : 01-07-2017
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This paper presents a second-order tunable single-ended (unbalanced) bandpass filter (BPF) with continuous 0.4?3-GHz coverage and a tunable balun BPF with continuous 1.1?1.7-GHz coverage for software-defined radio transceivers with the use of band-switchable and radio frequency (RF)-micro-electromechanical systems (MEMS)-tuned resonators. The BPFs are realized with two pairs of RF switches for coa
An efficient W-band InP DHBT digital power amplifier
Andreas Wentzel, Maruf Hossain, Dimitri Stoppel, Nils Weimann, Viktor Krozer, Wolfgang Heinrich
Published online : 01-07-2017
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This paper presents for the first time high-efficiency W-band power amplifiers (PAs), the design of which follows the digital PA (DPA) design concept. Two DPAs with different output networks have been realized: a single-band version (S-DPA) for 95 GHz and a dual-band design (D-DPA) for signal frequencies f of 68 GHz (first band) and 76 GHz (second band), respectively. The PAs are realized as monol
Palm tree structured wide band monopole antenna
Sandeep K. Palaniswamy, Kanagasabai Malathi, Arun K. Shrivastav
Published online : 01-11-2016
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This paper presents design, fabrication, and testing of a palm tree structured monopole antenna for wideband applications. The proposed antenna has a wide impedance bandwidth (?10 dB bandwidth) from 4 to 10.4 GHz. Palm tree antenna of compact size 23 mm × 20 mm is designed and fabricated on an FR4 substrate of thickness 1.6 mm. To validate the design, a mathematical relationship between the parame
A compact ultra wideband antenna with triple band-notch characteristics
Meenakshi Devi, Anil Kumar Gautam, Binod Kumar Kanaujia
Published online : 01-11-2016
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A novel design of a compact ultra wideband antenna with triple band-notched characteristics is proposed. Much wider impedance bandwidth (from 2.63 to 13.02 GHz) is obtained by using a star like-shaped radiator and a defected rectangular ground plane and band-notched functions are obtained by attaching L- and I-shaped structure on the ground and a capacitive-loaded loop (CLL) resonator on the patch
Design and implementation of a voltage-controlled oscillator for MICS-based sensor network system
Cihun-Siyong Alex Gong, Yu-Lin Tsou, Yan-Hsien Yang, Hwann-Kaeo Chiou, I-Chyn Wey, Meng-Tsan Tsai, Changhong Yu, Lingling Lin
Published online : 01-11-2016
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Wireless network has been emerged as one of the most promising technologies for sensor-integrated applications so far. The ever-increasing demand in long-term chronic monitoring of vital or essential signals is driving a technology revolution in dealing with critical issues of clinical, healthcare, fitness, and wellness, creating multidisciplinary collaborations to benefit mankind. The voltage-con
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