bluuebunny/crossref_metadata_2025_split huggingface dataset:
Dual‐band CPW‐fed rectangular patch antenna reactively loaded with a circular slot
Authors: Mebaoudj Hicham , Bouslimani Yassine , Sellal Kheireddine 
Published: December 2015

ABSTRACTThis article presents a rectangular patch antenna designed to work at Global Positioning System and C frequency bands. The dual‐band operation is obtained by combining the capacitive‐coupled coplanar waveguide with the reactive loading method, which consists of a circular slot etched on the rectangular patch. This latter was designed first to resonate at the principal frequency f10 then a circular slot was etched on the radiator to enhance the electric characteristics of the secondary frequency f30. The simulated and fabricated antenna resonates at 1.575 and 4.6 GHz. The achieved work shows a good concordance between the simulated and experimental results. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:360–363, 2016
Patch array antenna with cavity‐backed SIW feed for X‐band applications
Authors: Kamalzadeh Saeed , Arand Bijan Abbasi 
Published: December 2015

ABSTRACTIn this article, a new arrangement of patch array antenna incorporated with cavity back substrate integrated waveguide (SIW) and stacked structure is which operating at X‐band, is presented. The proposed structure enhances the gain and bandwidth of the array antenna markedly. The prototype antenna contains a 2 × 2 patch array formation with compact feed network that helps to miniaturize the structure and improve radiation properties in antenna. The inner metallic posts inside of the antenna limit the propagation of the lower mode and therefore TM220 mode is propagated as a dominant mode. For designing of the antenna, equivalent cavity model is used, but for the final full wave simulations, it is replaced with SIW configuration. The stack layer is added to the antenna to improve its bandwidth, efficiency, and gain. The proposed antenna is fabricated on RO4003 substrate with thickness of about 0.8 mm, and total dimensions of 38 × 38 mm2 and stacked layers are etched on RT‐Duroid 5880 substrate with thickness of 1.6 mm. An acceptable agreement is obtained between measured and simulated results. The proposed antenna has 2.7% bandwidth and at the center frequency (9.01 GHz) its gain is 10.8 dBi with 95% efficiency and 25.02 dB front to back ratio. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:319–323, 2016
Design of 5 GHz‐compact reconfigurable DGS‐bandpass filter using varactor‐diode device and coupling matrix technique
Authors: Boutejdar Ahmed 
Published: December 2015

ABSTRACTIn this work, a novel electrical reconfigurable second order microstrip bandpass filter is presented. The investigated filter structure consists of two neighbor coupled octagonal‐DGS resonators. The capacitor and varactor are placed on the DGS‐shape. According to the tunable characteristic of discrete lumped capacitors and varactor diode, the resonant frequencies can be tunable. The proposed filter occupies an area of 2.5 × 1.5 cm2. The coupling method has been applied and leads to an extended coupling matrix that assumes multiple couplings between both filter resonators. The measured relative tuning range of the bandpass filter is 23.5% with a fractional bandwidth of 12%. Varactors loaded on the octagonal DGS resonator allow us to control the center frequency with quasi constant bandwidth as well as to have a large tuning bandwidth. Based on the detailed analysis, the varactor‐tuned DGS bandpass filter is designed, in which the tuning bandwidth reaches 12% of the center frequency at 5 GHz. The proposed reconfigurable bandpass filter was fabricated and tested. The measured results show a variation of the center frequency from 4.3 GHz (0V) to 5.4 GHz (15V) tunable range, while the insertion loss varies from 5 to 3 dB. The measured performance of the tunable bandpass filter agrees well with the simulation results. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:304–309, 2016
Patch crossover with bandpass filtering function
Authors: Gao Teng , Li Yong Chao , Zheng Shao Yong , Bao Yan Xiang 
Published: December 2015

ABSTRACTFiltering patch crossovers with single‐ and dual‐band operation are implemented for the first time. For the single‐band filtering crossover, it is composed of four inset fed input/output ports and a circular patch. The dual‐band property can be easily realized with high flexibility by loading four open stubs. To verify the design concept, three filtering crossovers are implemented. The measured results agree well with the simulation, exhibiting crossover characteristics throughout the specific passband and high rejection level within the suppression band. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:301–304, 2016
Design of a dual band V‐shaped patch antenna using shorting posts
Authors: Borah Pranjal , Bhattacharyya Satyajib 
Published: December 2015

ABSTRACTIn this article, shorting posts at the tips of a probe fed V‐shaped patch antenna is used for dual band communication. Measurements are performed for shorting posts placed at different distances from the tip of the arm and are compared with the V‐patch without shorting posts. The measured results show good return loss performance in the C‐ and X‐band. Radiation pattern in the broadside direction is observed for the lower resonant frequency whereas it tilts away from the broadside for the upper resonant frequency. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:376–378, 2016
Differential‐fed UWB antenna with dual band‐notched characteristics
Authors: Tang Zhaoyang , Lian Ruina , Yin Yingzeng 
Published: December 2015

ABSTRACTIn this letter, a differential‐fed ultrawideband (UWB) antenna with dual band‐notched characteristics is proposed. The proposed antenna mainly consists of two UWB rectangular ring monopole antennas which are placed face‐to‐face and a square ground plane with a modified square slot. To avoid the electromagnetic interference within the UWB band, a C‐shaped stub connected with the ring monopole is adopted to reject 3.5‐GHz WiMAX while an inverted‐Ω shaped slot embedded in the monopole antenna is used to filter 5.5‐GHz WLAN. A prototype of the antenna with the optimized parameters is fabricated and tested. Measured results show that the 10‐dB impedance bandwidth is from 2.53 to more than 11 GHz, along with dual notched bands of 3.27–4.13 and 4.95–6.28 GHz. In addition, the antenna has good radiation patterns and stable gain in the whole operating band. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:351–355, 2016
Comact varactor‐tuned wideband bandpass filter using lumped‐element tri‐mode resonator
Authors: Xu Jin 
Published: December 2015

ABSTRACTThis article presents a compact microstrip varactor‐tuned wideband bandpass filter (BPF) using lumped‐element tri‐mode resonator (LE‐TMR). Theoretically, the proposed LE‐TMR has three transmission zeros at most, resulting in high passband selectivity. The fabricated tunable wideband BPF occupies a compact size of 0.029λg × 0.118λg. The measured results show that the passband can be tuned in a frequency range from 0.724 to 1.041 GHz with an almost 3 dB constant fractional bandwidth of 44 ± 1%. Within the tuning range, the measured insertion loss varies from 1.4 to 0.9 dB and the measured return loss is better than 11 dB for all states. The simulation agrees very well with measurement. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:368–372, 2016
A fractal‐based compact broadband polarization insensitive metamaterial absorber using lumped resistors
Authors: Munaga Praneeth , Ghosh Saptarshi , Bhattacharyya Somak , Srivastava Kumar Vaibhav 
Published: December 2015

ABSTRACTIn this article, a broadband polarization insensitive metamaterial absorber has been proposed for C‐band (4–8 GHz) applications using lumped resistors. The unit cell of the proposed structure is based on an inverted Minkowski fractal loop, where four lumped resistors are mounted to obtain a broad absorption band at the expense of 5 mm thick dielectric substrate, which is only 0.033λ0 with respect to the lowest operating frequency. The proposed structure is polarization insensitive and also wide angle absorptive. A prototype of the proposed structure has been fabricated, which is experimentally verified with the simulated responses. The designed structure is much compact compared with other reported structures due to its unique design and thus can be considered as a compact broadband absorber for C‐band applications. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:343–347, 2016
Multiband FSS with wideband and sharp falling down characteristics
Authors: Luo Hui , Wu Weiwei , Xie Shaoyi , Fan Jiawu , Yuan Naichang 
Published: December 2015

ABSTRACTA multiband frequency selective surface (FSS) with wideband and sharp falling down characteristics is proposed. Measured results agree well with simulated ones and indicate that the proposed FSS performs well for any polarization. A study on how the parameters affect performances is proceeded and a guideline of how to regulate the related parameters to achieve desired resonant frequencies is introduced. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:378–382, 2016
Compact miniaturized half‐mode waveguide/high pass‐filter design based on SIW technology screens transmit‐IEEE C‐band signals
Authors: Rabah Mohamed Amine , Abri Mehadji , Badaoui Hadjira Abri , Tao Junwu , Vuong Tan‐Hoa 
Published: December 2015

ABSTRACTIn this article, a novel compact structure with a compact size and low insertion loss half‐mode substrate integrated waveguide/high pass‐filter dedicated for microwave signal guiding and high signal filtering that screen transmit‐IEEE C‐band signals is optimized, fabricated, and measured. The measurements results of the S parameters are compared with those provided by the commercial software CST Microwave Studio. Agreements between measurements data and the CST software results were achieved. It numerically compares how the transmission in C‐band can be successfully achieved with HMSIW. The Half‐Mode SIW Waveguide/High Pass‐Filter design size achieved is 7.5 × 35 mm2. A size reduction of about 50% in comparison with a similar SIW Waveguide/High Pass‐Filter has been achieved. The measured insertion loss is below −2 dB while the return loss is less than 10 dB. It is attractive which can be used for the radio communication system applications. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:414–418, 2016
Interferometer method using abel inversion to deduce a mapping of helium gas density and temperature
Authors: Benyahia D. , Lemerini M. 
Published: December 2015

ABSTRACTIn this work is presented an optical method using the Mach–Zehnder Interferometer for diagnose a pure helium gas subjected to a stationary point‐plane corona dischargeat atmospheric pressure, and visualize the spatial map of refraction index, density and temperature.The Mach‐Zehnder interferometer that we have applied here is assumed to be cylindrically symmetric and the distance between electrodes equals 6 mm.By studying the interferograms obtained in the experiment, it is possible to determine the distribution of the refraction index and extract the density and temperature through the Gladstone–Dale relation and the ideal gas law respectively. The obtained results are in close agreement with values available in the literature.The obtained results show that the rate variation of the density is varying from 20 to 40% in all the space. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:393–398, 2016
Stabilization effect by the temperature of immersion liquid in the 3–6 GHz microwave tomography system
Authors: Kim Jang‐Yeol , Lee Kwang‐Jae , Son Seong‐Ho , Kim Hyuk‐Je , Lee Jong‐Moon , Jeon Soon‐Ik , Kim Nam 
Published: December 2015

ABSTRACTA study on temperature stabilization effect of the immersion liquid in a 3‐6 GHz microwave tomography (MT) system for medical diagnosis is presented. The designed temperature control device unit is applied in the MT system for the analysis of the temperature impact. This control unit with an advanced control method is required to precisely maintain the temperature of the immersion liquid for obtaining stable measurement data. If the temperature of the liquid is maintained ideally, the peak to peak deviation of the measured amplitude and phase are very small within approximately 0.18 dB and 1.3 degree over the entire frequency range. The temperature variation of the liquid is a key factor for high spatial resolution to detect small tumors. The detailed results are presented and discussed. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:461–464, 2016
Wideband dielectric resonator antenna using CPW fed segments
Authors: Nawaz Hamza , Shahid Saleem , Gentili G. Guido 
Published: December 2015

ABSTRACTIn this article, a wideband dielectric resonator antenna with relative bandwidth of 81.25% is proposed. The antenna is coplanar waveguide fed and is provided with two different dielectric loadings to obtain the desired results. The antenna has been fabricated using FR4 as a substrate and Roger RT/duroid 5880 and Roger RT/duroid 6010 as dielectric resonators with a total size of 42 × 36 × 6.6 mm3. The proposed antenna is suitable for wide‐band applications, has a rather uniform radiation pattern, and a high radiation efficiency throughout the operational bandwidth along with being low‐profile and small in size. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:441–445, 2016
Dual‐band on‐body antenna for in‐on‐on WBAN repeater applications
Authors: Kang Do‐Gu , Tak Jinpil , Choi Jaehoon 
Published: December 2015

ABSTRACTA dual‐band on‐body antenna for in‐on‐on wireless body area network repeater applications is proposed. This antenna consists of a dual‐patch antenna and a zeroth‐order resonance (ZOR) element. The two patch antenna elements form dual resonances that cover the 2.4 GHz ISM band. In addition, a triangle cut made at the lower edge of patch Element 1 improves the impedance matching in the 2.4 GHz ISM band. The ZOR element operates in the 403 MHz MICS band. The antenna has near surface radiation in the 2.4 GHz ISM band and nearly omnidirectional radiation in the 403 MHz MICS band. To evaluate the performance of the antenna on a human body, the proposed antenna is placed on a human equivalent flat phantom. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:436–441, 2016
Reconfigurable vivaldi antenna with improved gain for UWB applications
Authors: Herzi Rabiaa , Zairi Hsan , Gharsallah Ali 
Published: December 2015

ABSTRACTThis article presents a new reconfigurable modified Vivaldi antenna with improved gain. A simple Vivaldi antenna is modified by adding slots in the extremities to demonstrate good radiation characteristics. The antenna reconfiguration is attended by inserting diodes PIN switches at specific localizations in the aperture antenna to change its resonance frequency. A wide bandwidth from 2 to 5 GHz and several narrow bands are obtained. This antenna is a good candidate for multi‐applications necessitating frequency reconfigurable antenna. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:490–494, 2016
An optoelectronic multiplexer for wireless transmissions of high‐speed data‐modulated microwave sub‐carriers
Authors: Gutiérrez‐Martínez Celso , Santos‐Aguilar Joel , Morales‐Díaz Adolfo , Torres‐Fórtiz José Alfredo , Meza‐Pérez Jacobo 
Published: December 2015

ABSTRACTIn this article, an optoelectronic multiplexing scheme is reported. This scheme results from the association of a multimode laser and the chromatic dispersion on standard single mode optical fiber. The frequency response of this system shows a series of microwave band‐pass windows, which can be used for allocating modulated microwave subcarriers. Under this operating principle, the multiplexing of two data‐modulated microwave subcarriers at 2.4 and 7.2 GHz is described in this work. 100 Mbps‐NRZ and vector digital data (QPSK, mQAM) were transmitted and evaluated. The performance of the multiplexing scheme shows that it can be used for high‐speed wired or wireless transmissions. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:486–490, 2016
Ground plane booster antenna technology using a self‐diplexed matching network for multiband operation
Authors: Picher Cristina , Anguera Jaume , Bujalance Adrian , Andújar Aurora 
Published: December 2015

ABSTRACTThe non‐stop evolution of wireless handset devices together with the apparition of new communication standards encourage antenna engineers to design new concepts able to satisfy the current market demands. The objective of the present article is to provide a radiating system for a smartphone platform capable of operating at the most common mobile frequency bands (LTE‐800, GSM‐850, GSM‐900, LTE‐1700, LTE‐1800/GSM‐1800, GSM‐1900, LTE‐2100/UMTS, and LTE‐2300). The proposed design is based on a non‐resonant element only requiring a volume of 250 mm3 able to provide radiation thanks to the ground plane and a self‐diplexed matching network. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:453–461, 2016
Analysis of antenna gain enhancement using new frequency selective surface superstate
Authors: Bouslama Moufida , Traii Moubarek , Gharsallah Ali , Denidni Tayeb Ahmed 
Published: December 2015

ABSTRACTIn this article, a new high‐gain resonant cavity (RC) antenna with a frequency selective surface (FSS) superstrate is presented at 6 GHz operating frequency. The high‐gain FSS antenna is constructed by a new FSS superstrate layer, providing more freedom to improve the radiation pattern characteristics. A hybrid FSS element placed on top of the antenna is also investigated to estimate the required number of unit cells. The achieved simulation results for this antenna are thoroughly studied and the FSS superstrate enhancing the proposed antenna gain is discussed. Moreover, parametric studies for the patch antenna with and without FSS superstrate are also presented to demonstrate the effect of the new FSS superstrate on the radiation pattern characteristics. The measured results are achieved to support the simulation ones. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:448–453, 2016
Miniaturized unilateral coplanar waveguide‐fed asymmetric planar antenna with reduced radiation hazards for 802.11ac applications
Authors: Gunavathi N. , Kumar D. Sriram 
Published: December 2015

ABSTRACTThis article presents a printed asymmetric planar antenna with unilateral CPW feed for smart mobile phone technology for recently developed, less crowded 802.11ac (5 GHz Wi‐Fi) applications. The unilateral CPW feed as well as asymmetric (inverted L shaped) radiating elements have been printed on low cost single sided PCB. The proposed antenna offers a wider impedance bandwidth from 4.35 GHz to 5.82 GHz, compactness of about 40.659% compared to conventional CPW‐fed antenna and reduced radiation hazards. It has been printed on a FR4‐epoxy substrate with dielectric constant (εr) of 4.4. The overall dimension of the antenna is 18 mm × 18 mm × 1.6 mm. The impact of all the geometrical parameters on return loss plots and other antenna parameters have been studied using electromagnetic simulation software High Frequency Structured Simulator 14.0. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:467–471, 2016
Life and Death in Neolithic Southeastern Italy: The Strontium Isotopic Evidence
Authors: Tafuri M. A. , Fullagar P. D. , O'Connell T. C. , Belcastro M. G. , Iacumin P. , Conati Barbaro C. , Sanseverino R. , Robb J. 
Published: December 2015

AbstractThere is a strong relation between people's structured identities and their chemical biographies: these can reflect the way individuals choose to reside and/or move. The strontium isotope ratio (87Sr/86Sr) of skeletal remains is considered a useful proxy to assess residential mobility and social practices in past populations; however, so far, it has only occasionally been applied to prehistoric contexts in the Mediterranean. In this paper, we present 87Sr/86Sr data of human and animal samples from several Neolithic sites in the Apulian Tavoliere (southeastern Italy), namely, Grotta Scaloria, Passo di Corvo, Masseria Candelaro and La Torretta/Poggio Imperiale. Data obtained from dental enamel reflect the local origin of the individuals and allowed us to differentiate function and meaning of the sites examined. In particular, within a generally homogeneous background of Sr signatures, the range of 87Sr/86Sr at Scaloria Cave is greater than at the other sites, with variation likely to be related to funerary practices. We interpret this as the evidence of the ritual use of the cave, which implied the gathering of people of different origin. The relative variation of the Sr signature among individuals, either intersite or intrasite can be tentatively associated with mobility during life as well as with social practices, such as access to foods from geologically different environments. Copyright © 2015 John Wiley & Sons, Ltd.
Management and Outcome of Ewing Sarcoma of the Head and Neck
Authors: Grevener Knut , Haveman Lianne M. , Ranft Andreas , van den Berg Henk , Jung Susanne , Ladenstein Ruth , Klco‐Brosius Stephanie , Juergens Heribert , Merks J Hans M. , Dirksen Uta 
Published: December 2015

BackgroundEwing sarcoma (EWS) of the head and neck is rare. Multimodal treatment consists of chemotherapy and local treatment; however, local treatment for EWS of the head and neck is challenging. The first objective was to describe local treatment administered to the patients with localized EWS of the head and neck according to the EURO‐E.W.I.N.G.99‐trial, and to assess the impact on survival. The second objective was to systematically review the scientific literature available for this topic.ProcedureFifty‐one patients were included. Local control consisted of surgery and/or radiotherapy (RT). Event‐free survival (EFS) and overall survival (OS) were determined. Outcome was analyzed by comparing local treatment approaches. A Medline search was performed for EWS of the head and neck.ResultsEighty‐six percent of patients had localized disease. Most common primary sites included the skull (45%), maxilla (14%), and mandible (12%). Three‐year EFS was 74% and 3‐year OS was 87% for patients with localized disease. EFS was 40% for patients >15 years compared to 81% for patients <15 years. Local control consisted of surgery (S; 33%), RT (18%), or S + RT (45%). Related 3‐year EFS was 81% (S), 80% (RT), and 72% (S + RT); 3‐year OS was 80%, 76%, and 81%, respectively.ConclusionsIn patients with EWS of the head and neck, age, and stage are important prognostic factors. Although not statistically significant, large tumor volume seems to be a negative prognostic factor. No difference in EFS and OS could be found when comparing patients treated with surgery, RT, or combined surgery and RT.