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1110 documents found for International Journal
A metamaterial absorber based high gain directional dipole antenna
Sarin Valiyaveettil Pushpakaran, Jayakrishnan M. Purushothama, Manoj Mani, Aanandan Chandroth, Mohanan Pezholil, Vasudevan Kesavath
Published online : 01-05-2018
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A novel idea for generating directional electromagnetic beam using a metamaterial absorber for enhancing radiation from a microwave antenna in the S-band is presented herewith. The metamaterial structure constitutes the well-known stacked dogbone doublet working in the absorption mode. The reflection property of the dogbone metamaterial absorber, for the non-propagating reactive near-field, is uti
Wideband high-efficiency linearized PA design with reduction in memory effects and IMD3
Xuekun Du, Chang Jiang You, Yulong Zhao, Xiang Li, Mohamed Helaoui, Jingye Cai, Fadhel M. Ghannouchi
Published online : 01-05-2018
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An analytical method is proposed to reduce the memory effects and third-order intermodulation distortions for improving the linearity of wideband power amplifier (PA). An excellent linearity can be obtained by reducing the second-harmonic output power levels and reducing the envelope voltage components in the megahertz range. An improved wideband Chebyshev low-pass matching network including the b
Compact microstrip bandpass filter using dual closed-loop stepped impedance resonator
Salif N. Dembele, Ting Zhang, Jingfu Bao, Denis Bukuru
Published online : 01-05-2018
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A dual closed-loop stepped impedance resonator (DCLSIR) is investigated and used in designing a compact microstrip bandpass filter (BPF). The proposed DCLSIR is symmetrical; as a result, the symmetric characteristics of the resonator have been used. The design equations are derived and used to support the circuit design. The center frequency, position of transmission zeros, and fractional bandwidt
Microstrip diplexer design based on two square open loop bandpass filters for RFID applications
Hafid Tizyi, Fatima Riouch, Abdelwahed Tribak, Abdellah Najid, Angel Mediavilla
Published online : 01-05-2018
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In this work, a simple and efficient approach to design a microstrip diplexer is proposed. It is based on the combination of two compact Square Open Loop Resonator band pass filters. These filters are designed for Radio Frequency Identification application at 2.45 GHz frequency. Using the Chebychev approximation, the two filters and diplexer are designed, simulated, fabricated, and measured. The r
Longitudinal slotted waveguide array feed networks
J. Soleiman Meiguni, S. Keshavarz Haddad, A. Hosseinbeig
Published online : 01-05-2018
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In this paper, two new feed network designs for single layer and double layer slotted waveguide array antennas are presented. A microstrip to substrate integrated waveguide transition is applied to the single layer antenna. The aperture coupling mechanism is used in order to find the optimum feed network for double-layer structure and to obtain stable radiation characteristics over the frequency b
Inferring the atmospheric duct from radar sea clutter using the improved artificial bee colony algorithm
Chao Yang, Lixin Guo
Published online : 01-05-2018
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In this paper, an orthogonal crossover artificial bee colony (OCABC) algorithm based on orthogonal experimental design is presented and applied to infer the marine atmospheric duct using the refractivity from clutter technique, and the radar sea clutter power is simulated by the commonly used parabolic equation method. In order to test the accuracy of the OCABC algorithm, the measured data and the
Substrate integrated waveguide fed dual-frequency dual-linearly-polarized dielectric resonator antenna
Abhishek Sharma, Anirban Sarkar, Animesh Biswas, M. Jaleel Akhtar
Published online : 01-05-2018
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In this paper, a single-feed dual-frequency dual-linearly-polarized dielectric resonator antenna is proposed which finds application in two- way internet satellite system and modern radar system. In order to achieve dual linear polarization at distinct frequencies, two rectangular dielectric resonators of same dimensions are excited in and modes by a narrow longitudinal and transverse slot, resp
Inverted-L microstrip open slot antenna with wideband circularly polarization for Wimax application
Cheng-Zhong Lv, Lu-Chun Yang
Published online : 01-05-2018
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A novel wideband circularly polarized printed antenna is proposed in this paper. It consists of asymmetrical ground and monofilar spiral stubs connecting to it. By employing an inverted L-shaped microstrip feedline to excite the slit etched in the ground and spiral stubs, a wideband culalry polarized performance of the proposed antenna is realized. After optimization, the measured results of the f
Design of compact frequency agile filter-antenna using reconfigurable ring resonator bandpass filter for future cognitive radios
Hany A. Atallah, Adel B. Abdel-Rahman, Kuniaki Yoshitomi, Ramesh K. Pokharel
Published online : 01-05-2018
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In this paper, a new miniaturized frequency agile filter-antenna with a wide reconfigurable frequency band is proposed for interweave cognitive radios (CRs). A tunable bandpass filter (BPF) composed of a symmetrical ring resonator is cascaded to the feed line of an ultra-wideband planar antenna. The structure of the proposed ring resonator BPF is simple and compact so that the total size of the pr
Design and analysis of a compact quad band loaded monopole antenna with independent resonators
Mahmoud A. Abdalla, Zhirun Hu
Published online : 01-05-2018
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A quad band antenna with good gain and omni-directional pattern is proposed in this paper. The antenna design is based on loading a conventional monopole antenna by three different resonators. The resonators are inspired from the shunt branch of composite right-/left-handed cell. The resonators have a simple structure and compact size. The control of the frequency bands can be achieved arbitrarily
A versatile reconfigurable antenna with integrated sensing mechanism
Sonia Sharma, Chandra Charu Tripathi, Rahul Rishi
Published online : 01-05-2018
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An integrated reconfigurable antenna capable of spectrum sensing along with various reconfiguration features such as polarization, frequency, bandwidth, and radiation pattern is proposed here. The proposed antenna senses the spectrum by UWB antenna from 2 to 11 GHz to identify the spectrum conditions. After identifying the direction of maximum traffic or interference, the proposed antenna accordin
A novel ACPW-fed quad-band hybrid antenna for wireless applications
Wang Ren, Li-Juan Zhang, Shu-Wei Hu
Published online : 01-05-2018
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This paper presents a novel asymmetric coplanar waveguide-fed quad-band hybrid antenna for wireless applications. The proposed hybrid antenna combines a conventional monopole antenna and a zeroth-order resonator antenna to perform a dual-mode operation. The first mode is generated by a slotted monopole antenna, supporting the two higher resonances at about 3.5 and 5.8 GHz. The second mode is suppo
High gain low profile wideband dual-layered substrate microstrip antenna based on multiple parasitic elements
Haixiong Li, Bozhang Lan, Jun Ding, Chenjiang Guo
Published online : 01-05-2018
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In this paper, a high gain broadband low profile microstrip antenna with the dual-layered substrate and four parasitic metal elements is presented. The proposed microstrip antenna is mainly composed of four parts: four circular parasitic metal patches with dual arced breaches, a rectangular metal patch sandwiched between substrates, a square ground plane, and two-square substrates. The circular pa
1D and 2D phase gradient perforated dielectric reflective surfaces at Wave
Mustafa K. Taher Al-Nuaimi, Wei Hong, Xiqi Gao
Published online : 01-05-2018
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This paper presents the design of all dielectric non-absorptive phase gradient reflective surfaces that can be used to manipulate the reflected electromagnetic waves at millimeter-wave regime. Compared with a bare perfect electrical conductor reflector which obeys the classical Snell's law of reflection, the presented design can effectively alter both the shape and level of the backscattered energ
MRF volume 10 issue 3 Cover and Back matter
Published online : 01-05-2018
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MRF volume 10 issue 3 Cover and Front matter
Published online : 01-05-2018
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A highly selective UWB bandpass filter using stepped impedance stubs
Minjae Jung, Byung-Wook Min
Published online : 01-04-2018
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We present a new ultra-wideband (UWB) band-pass filter (BPF) configuration with a stepped impedance short-circuited stub (SISS)-loaded triple-mode resonator (TMR) and stepped impedance radial stub (SIRS). The novel SISS-loaded TMR and SIRS improve the roll-off ratio at both ends. Even though this UWB BPF is based on a single resonator, the measured results show excellent in-band performance with a
Novel compact microstrip diplexer for GSM applications
Abbas Rezaei, Leila Noori
Published online : 01-04-2018
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In this paper, a microstrip diplexer is designed based on a novel structure consisting of the meandrous and patch cells. It operates at 0.8 and 0.9 GHz for global system for mobile communications applications. The proposed diplexer is well miniaturized with an overall size of 0.01 g. It has the narrowband channels making it appropriate for the modern long-range communication systems, which are wid
Ring filter synthesis and its BiCMOS 60 GHz implementation
Pedro Rynkiewicz, Anne-Laure Franc, Fabio Coccetti, Matthias Wietstruck, Christian Wipf, Selin Tolunay Wipf, Mehmet Kaynak, Gaëtan Prigent
Published online : 01-04-2018
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The detailed synthesis of a direct access ring filter topology fully controlled with the following targeted specification (center frequency, low transmission zero frequency, and matching level in the passband) is hereby presented. For this topology, the lowest achievable bandwidth is limited by technological constraints. Thereby a solution consisting in adding capacitive loads is proposed. The ass
Terahertz antenna technology for imaging applications: a technical review
Isha Malhotra, Kumud Ranjan Jha, Ghanshyam Singh
Published online : 01-04-2018
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The terahertz (THz) regime of the electromagnetic spectrum is rich with the emerging possibilities in imaging applications with unique characteristics to screening for weapons, explosives and bio-hazards, imaging of concealed objects, water content, and skin, and these advantages can be harnessed by using the effective THz sources and detectors. In THz imaging systems, the pulsed THz sources and d
Wideband Gysel HMSIW power divider with high power-handling capability
Kaijun Song, Te Kong, Yu Zhu, Hongxing Xu, Lifei Jiang, Yong Fan
Published online : 01-04-2018
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A novel Gysel power divider with high power-handling capability based on half-mode substrate integrated waveguide (HMSIW) has been presented in this paper. A HMSIW ring is used and good input/output impedance matching is achieved based on HMSIW-microstrip taper transition. Two microstrip stubs are introduced in HMSIW ring to assemble two isolation resistors to improve the isolation between the out
Metamaterial inspired DNG superstrate for performance improvement of microstrip patch antenna array
Chirag Arora, Shyam S. Pattnaik, Rudra Narayan Baral
Published online : 01-04-2018
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To utilize the manipulation of wave properties by metamaterials, in this paper, a microstrip-fed patch antenna array, loaded with metamaterial superstrate, has been proposed. Under unloaded conditions, the conventional patch antenna array resonates at IEEE 802.16a 5.8 GHz Wi-MAX band with gain of 4.31 dBi and bandwidth of 425 MHz, whereas when each patch of this array is loaded with a metamaterial
Frequency reconfigurable dual-band MIMO antenna using pentagon slot resonator with improved bandwidth
Deepali Borakhade, Sanjay Pokle
Published online : 01-04-2018
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In this paper, multiple-input?multiple output (MIMO) antenna with dual-band frequency reconfiguration is presented. The proposed antenna consists of two symmetrical pentagon radiating elements. These radiating elements support bands of 1.5 GHz (GPS) and 2.4 GHz (Wi-Fi) frequency. The two PIN diodes are appropriately located on slot line in order to control the current flowing through the radiator.
Millimeter-wave beam-steering high gain array antenna by utilizing metamaterial zeroth-order resonance elements and Fabry-Perot technique
Asghar Bakhtiari, Ramezan Ali Sadeghzadeh, Mohammad Naser-Moghaddasi
Published online : 01-04-2018
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Millimeter-wave (mm-wave) beam-steering antennas are preferred for reducing the disruptive effects, such as those caused by high atmospheric debilitation in wireless communications systems. In this work, a compact broadband antenna array with a low loss feed network design is introduced. To overcome the short-range effects on mm-wave frequencies, a feed network ? with a modified Butler matrix and
Synthesis of non-uniform circular antenna arrays with multiple constraints
Hua Guo, Lin Cui, Xiaodan Zhang, Yameng Jiao
Published online : 01-04-2018
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Synthesis of non-uniform circular antenna arrays using a hybrid invasive weed optimization is introduced in this paper. The excitation weights and positions of array elements are optimized to reduce the peak side lobe level (PSLL) of the radiation pattern. The method proposed in this paper can effectively constrain the number of the array elements, size of the array, and the angular spacing of the
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