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1030 documents found for International Journal
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
Interference cancellation for higher harmonics of supply-modulated efficient RF power amplifier systems
Mohammad Omer, Farasat Munir
Published online : 01-05-2017
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In building highly efficient transmitters of today, one is forced to sacrifice linearity for efficiency. Some of the highest power amplifier efficiency figures are reported by envelope tracking (ET) amplifiers. These amplifiers can generate strong higher-order harmonics, which can lead to interference with receivers operating at the harmonic frequencies. Using non-linear interference cancellation,
A novel single-feed reconfigurable antenna for polarization and frequency diversity
Ailar Sedghara, Zahra Atlasbaf
Published online : 01-06-2017
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A novel dual-band single-feed reconfigurable annular-ring slot antenna with polarization diversity is proposed. This antenna has the ability to switch frequency bands and polarization at the same time whereas applying a simple structure. It consists of two concentric circular slots and two tuning stubs on one side of the substrate and a 50 ? microstrip feed line and two stubs on the other side. Th
Compact UWB?MIMO antenna with quad-band-notched characteristic
Ling Wu, Yingqing Xia
Published online : 01-06-2017
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With quad-band-notched characteristic, a compact ultrawideband (UWB) multiple-input-multiple-output (MIMO) antenna is introduced in the paper. The UWB?MIMO system has two similar monopole elements and occupies 30 × 45 mm. By inserting two L-shaped slots, CSRR and C-shaped stubs, four notched bands are achieved (3.25?3.9, 5.11?5.35, 5.5?6.06, and 7.18?7.88 GHz) to filter WiMAX, lower WLAN, upper WL
Gain and bandwidth enhancement of New Planar microstrip array antennas geometry for C band weather radar applications
Abdellatif Slimani, Saad Dosse Bennani, Ali El Alami, Mohamed Amellal
Published online : 01-06-2017
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A 4?8 GHz ultra wide band microstrip array antennas with improved gain for weather Radar applications was designed and fabricated. The microstrip radiating elements of the proposed array antennas are powered using a T-junction power divider with quarter wave-transformer impedance for a best matching. The design of this array antennas is based on the geometry of a linear array antennas well studied
Theoretical and experimental development of a high-conversion-efficiency rectifier at X-band
Feifei Tan, Changjun Liu
Published online : 01-06-2017
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Voltage doubler rectifiers are usually applied to systems with high voltage and low current requirement. An X band voltage doubler rectifier has been developed with 72% conversion efficiency. To the best of our knowledge, the obtained rectifying efficiency is the maximum reported to date at X band with Schottky diodes. The working characteristics of the diodes in the voltage doubler rectifier are
Compact dual-band antennas with large frequency ratio and bandwidth enhancement for wireless applications
Abdelheq Boukarkar, Xian Qi Lin, Yuan Jiang
Published online : 01-06-2017
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In this paper, compact single-feed dual-band antennas for different wireless applications are proposed. First, a dual-band antenna with a comparatively large frequency ratio of 2.58 is designed. Then, a novel dual-band antenna is introduced in order to enhance the upper frequency band. The technique consists of modifying the feed line structure, which leads to a 9.23% of impedance bandwidth at the
An ACS-fed F-shaped monopole antenna for GPS/WLAN/WiMAX applications
Wang Ren, Shu-Wei Hu, Chen Jiang
Published online : 01-06-2017
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In this paper, an asymmetric coplanar strip (ACS)-fed quad-band monopole antenna for the global positioning system (GPS), wireless local area network (WLAN), and worldwide interoperability for microwave access (WiMAX) applications is proposed. It is composed of an F-shaped monopole and a partial ground plane, which are both printed on one side of a low-cost FR4 substrate with a compact volume of 4
A compact microstrip low-pass filter with ultra wide stopband using compact microstrip resonant cells
Saeed Roshani
Published online : 01-06-2017
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In this paper, a novel compact microstrip low-pass filter (LPF) with ultra wide stop band and sharp roll off, is proposed. In the proposed structure, a high impedance transmission line is loaded by compact microstrip resonant cells, which results in ultra wide stopband. The ?3 dB cut-off frequency of filter is 1.5 GHz and the maximum insertion loss is <0.1 dB in the passband. The proposed LPF pres
Band-pass filtering Gysel power divider with inherent DC-block function and high all-frequency isolation
Yongle Wu, Lingxiao Jiao, Jiayu Wang, Weimin Wang, Yuanan Liu
Published online : 01-06-2017
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A novel small-size filtering power divider (PD) featured four-function integration is proposed. These four integrated functions are high-selectivity filtering, inherent DC block, high all-frequency isolation, and high-power applications. Using single-layer planar circuit technology, this proposed PD can be implemented easily. The measured results of a prototype show that it can operate at 2 GHz wi
Using intrinsic zero to notch satellite signals in UWB filter
Yang Xiong, Cheng Teng, Ming He, Kam-Weng Tam, Xian Yu, Wai-Wa Choi, Hai Hua Chen
Published online : 01-06-2017
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In this paper, an ultra-wideband (UWB) filter with a notch band using T-shaped step impedance resonator loaded with cross-shaped open stubs has been presented. The notch band is formed by utilizing intrinsic zero. The characteristics of the new quad-mode resonator have been analyzed using odd-even mode analysis method. It can be shown that it is the intrinsic zero that generates the notch band. In
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