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940 documents found for International Journal
New Ku-band reflectarray antenna by using anisotropic superstrate on an artificial magnetic conductor
Mahmood Rafaei-Booket, Zahra Atlasbaf
Published online : 01-05-2017
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A new Ku-band reflectarray with an artificial anisotropic slab that consists of periodic holes, backed by a planar artificial magnetic conductor (AMC) is proposed. The unit-cell of the reflectarray is a two-layered structure that consists of a dielectric with a hole on a grounded patch. The phase diagram of the proposed unit-cell is calculated by a full-wave computational technique, which uses the
MRF volume 9 issue 3 Cover and Back matter
Published online : 01-03-2017
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MRF volume 9 issue 3 Cover and Front matter
Published online : 01-03-2017
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A compact reconfigurable sub-nanosecond pulse generator with pulse-shape modulation
Arash Valizade, Pejman Rezaei, Ali Asghar Orouji
Published online : 01-05-2017
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A new design of reconfigurable sub-nanosecond pulse generator (PG) with pulse shape selection ability is presented in this paper. Step recovery diode is used as the pulse sharpening device and the pulse shaping circuit consists of a controllable RC differentiator in which a single PIN diode is embedded, which provides two different switchable pulse shaping performances. The realized PG has a compa
Small embedded LTE/WWAN antenna integrated with keyboard ground plane in a laptop computer
Shu-Chuan Chen, Yun-Tsan Lee, Po-Wei Wu
Published online : 01-05-2017
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A novel small embedded long-term evolution/wireless wide area network (LTE/WWAN) antenna integrated with the keyboard ground plane in a laptop computer is presented. The antenna is installed on a notched region (40 × 8 mm) of the keyboard ground plane at a distance of 10 mm from the laptop computer hinge. A coupled-fed loop antenna was used because of its suitability for integration with the groun
Broadband circular patch antenna with monopolar radiation pattern for indoor wireless communication
Xi Wang Dai, Sheng Wen Mao, Tao Zhou
Published online : 01-05-2017
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A circular patch antenna with wide impedance bandwidth and monopolar radiation pattern for indoor wireless communication is proposed and analyzed in this paper. The antenna is a combination of circular patch and four capacitive feeds. By incorporating a cross-connected shorted conducting strip over the circular patch, the proposed antenna provides an enhanced impedance width of 65.4%, ranging from
Planar wideband band-stop filter with T-inverted shaped open stubs for wideband applications
Lahcen Yechou, Abdelwahed Tribak, Kacim Mohamed, Jamal Zbitou, Abdelmalik Bouyahyaoui, Angel Mediavilla Sanchez
Published online : 01-05-2017
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This paper presents a wideband band-stop filter (BSF) structure designed by using planar technology. The proposed filter consists of a modified conventional band-stop structure with open stubs, inner T-inverted shape, and two input/output feed lines. Based on series of optimization and a specific design method, two compact filters with good electrical performance are obtained. In order to characte
Theoretical study of ground radiation tag antenna with Tunable open-slot exciter
Yi-Fang Lin, Ming-Jui Chang, Hua-Ming Chen, Shih-Ting Huang
Published online : 01-05-2017
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A novel radio frequency identification tag antenna is composed of a resonant open-slot exciter and a dipole-type ground radiator. For a conjugate match to the Alien Higgs-4 chip impedance of 8?j149 ? at 925 MHz, a quarter wavelength open-slot resonator embedded at the center of the dipole-type ground plane (130 × 18 mm) was investigated and fabricated. Simple size adjustments and various loaded in
RF CMOS power amplifier using a split inter-stage inductor for IEEE 802.11n applications
Minoh Son, Jinho Yoo, Inseong Kang, Changhyun Lee, Jihoon Kim, Ho Jong Park, Young-Bae Park, Changkun Park
Published online : 01-05-2017
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In this study, we design a differential CMOS power amplifier using a 180-nm SOI RFCMOS process for 802.11n (64-QAM, 20 MHz bandwidth, 9.6 dB peak to average power ratio (PAPR)) applications. To minimize the chip area and mismatch in differential signals, we propose a layout method with an inter-stage matching network using a split inductor. By virtue of the symmetrical layout of the proposed split
Millimeter-Wave Fresnel Zone Plate Lens with new technological process
Antoine Jouade, Jonathan Bor, Mohamed Himdi, Olivier Lafond
Published online : 01-05-2017
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Fresnel Zone Plate lens (FZPL) antennas working in the V and W band are reported in this paper with half and quarter phase correction respectively. A low cost and straightforward technological process is used to manufacture the dielectric lenses using only one foam material where the dielectric constant is controlled. Simulation and measurement results are in good agreement that confirms the viabi
On-wafer noise parameters measurement using an extended six-port network and conventional noise figure analyzer
Abdul-Rahman Ahmed, Dong-Hyun Lee, Kyung-Whan Yeom
Published online : 01-05-2017
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In this paper, we demonstrate the successful implementation of an onwafer noise parameters test set that employs an extended six-port network and a conventional noise figure analyzer. The necessary formulation that enables the calibration of the noise parameter test set as well as extraction of the noise wave correlation matrix of a two-port device under test (DUT) was tested for coaxial connector
A high-gain inkjet-printed UWB LPDA antenna on paper substrate
Syed M. Hamza, Farooq A. Tahir, Hammad M. Cheema
Published online : 01-05-2017
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An ultra-wideband (UWB) log-periodic dipole array (LPDA) antenna inkjet-printed on a 0.5 mm thick photo paper substrate is presented. The overall size of the LPDA antenna is 130 × 60 mm. The LPDA antenna exhibits stable input-impedance characteristics and a consistent end-fire radiation pattern over the whole operating band of 2.2?11 GHz. Fulfilling the need of high-gain flexible antennas for UWB,
Whispering gallery mode resonators in microwave physics and technologies
Alexander Barannik, Nickolay Cherpak, Alexander Kirichenko, Yurii Prokopenko, Svetlana Vitusevich, Vladimir Yakovenko
Published online : 01-05-2017
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We review the main results of the development of whispering gallery mode (WGM) resonators and their unique applications due to their quasi-optical functionality. Several types of advanced WGM resonators are proposed by the authors. The theoretical results are described for the resonators with an analytical solution of the electromagnetic problems. Special emphasis is given to the interaction of mo
Dual high-selectivity band-notched UWB monopole antenna using simple dual-mode resonator and high-impedance lines
Yingjiang Guo, Xiaohong Tang, Kai Da Xu, Jing Ai
Published online : 01-05-2017
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A new planar microstrip-fed monopole ultra-wideband (UWB) antenna with dual notched bands has been presented. By employing a simple dual-mode resonator with two symmetrical outer high-impedance lines beside the microstrip feed line of the proposed UWB antenna, two controllable rejection bands with high-frequency selectivity are created. The parametric studies of the proposed structure are explored
Wideband to concurrent tri-band frequency reconfigurable microstrip patch antenna for wireless communication
Sonia Sharma, Chandra Charu Tripathi
Published online : 01-05-2017
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This paper proposes a novel wideband to concurrent tri-band frequency reconfigurable microstrip antenna. The frequency reconfiguration is achieved by using a pair of PIN diodes in the antenna feed line to switch the antenna either in wideband mode or in concurrent tri-band mode. In order to improve the bandwidth and gain of the antenna for wideband operation, the properties of J-K inverter and spl
An X-band Schottky diode mixer in SiGe technology with tunable Marchand balun
Rasmus S. Michaelsen, Tom K. Johansen, Kjeld M. Tamborg, Vitaliy Zhurbenko, Lei Yan
Published online : 01-06-2017
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In this paper, we propose a double balanced mixer with a tunable Marchand balun. The circuit is designed in a SiGe BiCMOS process using Schottky diodes. The tunability of the Marchand balun is used to enhance critical parameters for double balanced mixers. The local oscillator-IF isolation can be changed from ?51 to ?60.5 dB by tuning. Similarly, the IIP can be improved from 41.3 to 48.7 dBm at 11
Application of SRRs in conventional waveguide slot array to achieve performance improvement and dual-band characteristics
Avinash Chandra, Sushrut Das
Published online : 01-06-2017
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This paper presents application of split ring resonators (SRR) in conventional waveguide slot array antenna to achieve performance improvement and multiband characteristics. Three SRRs have been placed on the transverse plane of a conventional slotted waveguide and has been simulated and measured. The measured results show that the antenna has dual band response with respective 10 dB return loss b
A new efficient and proper modeling of isotropic/uniaxial anisotropic substrate specifications in design procedures of metasurfaces
Sara Moinzad, Ali Abdolali, Bagher Noorbakhsh
Published online : 01-06-2017
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Specifications of the substrates are among the most important and problematic parameters that still do not have proper models in the design procedures of metasurfaces. In this paper, a new fast and exact algorithm based on artificial neural networks (ANNs) is presented, which makes it possible to design frequency-selective surfaces (FSSs) on various kinds of standard substrates. Also for the first
An X-shaped fractal antenna with DGS for multiband applications
Ankush Gupta, Hem Dutt Joshi, Rajesh Khanna
Published online : 01-06-2017
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In this paper, an X-shaped fractal antenna with defected ground structure (DGS) is presented for multiband and wideband applications. The X shape is used due to its simple design and DGS is utilized to achieve size reduction with multiband and wideband features in the frequency range of 1?7 GHz. The proposed structure is fabricated on FR4 substrate with 1.6 mm thickness. We have proposed two diffe
MRF volume 9 issue 4 Cover and Back matter
Published online : 01-03-2017
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MRF volume 9 issue 4 Cover and Front matter
Published online : 01-03-2017
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Nonlinear modeling, time-domain analysis and simulation of non-Foster elements
Hamed Khoshniyat, Abdolali Abdipour, Gholamreza Moradi
Published online : 01-05-2017
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In this paper, the structure of a common field-effect transistor (FET)-based negative impedance converter (NIC) that behaves as a negative capacitor is presented. The nonlinear modeling, analysis, and simulation of this non-Foster structure are presented in the time domain and the transient response of the circuit can be used to study the stability of the circuit. For the analysis of the circuit p
Highly compact wideband double-section rat-race hybrid with harmonic suppression using series and shunt stepped impedance transmission lines
Kanaparthi V. Phani Kumar, S. S. Karthikeyan
Published online : 01-05-2017
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This paper presents the design of a size miniaturized and harmonic suppressed wideband double-section rat-race coupler (RRC). Series and shunt stepped-impedance transmission line units are proposed to replace the quarter wavelength transmission lines in the conventional design of wideband (50% fractional bandwidth) two-stage rat-race coupler. Design equations are derived using the lossless transmi
Rigorous study of propagation in metallic circular waveguide filled with anisotropic metamaterial
Hedi Sakli, Mohamed Yahia, Wyssem Fathallah, Jun Wu Tao, Taoufik Aguili
Published online : 01-05-2017
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This paper presents an extension of the formulation of wave propagation in transverse electric (TE) and transverse magnetic (TM) modes in the case of metallic circular waveguides filled with anisotropic metamaterials. The determined higher-order modes have been analyzed and exploited to the design of filters. Among the particularities of anisotropic material, the backward waves can propagate below
Broadband capacitively grounded coplanar to coupled microstrip transition for planar microwave photonic components
Massinissa Hadjloum, Mohammed El Gibari, Hongwu Li, Afshin S. Daryoush
Published online : 01-05-2017
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Broadband transitions are presented in this paper for capacitively grounded coplanar waveguide to coupled microstrip (CMS) lines. These transitions are realized on both thick Rogers RO3003 substrate (thickness of 10 mils) and a thin benzocyclobutene (BCB) polymer film (thickness of 20 µm). A flat bandwidth of 4?20 GHz and 3.2 to over 40 GHz are measured for the RO3003 and BCB polymer substrates, r
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