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1513 documents found for International Journal
MRF volume 13 issue 5 Cover and Back matter
Published online : 01-06-2021
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MRF volume 13 issue 5 Cover and Front matter
Published online : 01-06-2021
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A Pythagorean tree fractal shape stub-loaded resonator as a UWB bandpass filter with wide stopband
Puja Kumari, Pankaj Sarkar, Rowdra Ghatak
Published online : 01-06-2021
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A compact ultrawideband (UWB) bandpass filter (BPF) is designed by harnessing the efficacy of a Pythagorean tree fractal shape stub-loaded resonator. The design inherently provides the passband transmission poles, which make it convenient to be used in wide passband filtering circuits. The number and the position of the resonating modes can be controlled by increasing the iterations of the Pythago
Machine learning-based broadband GaN HEMT behavioral model applied to class-J power amplifier design
Jialin Cai, Justin King, Shichang Chen, Meilin Wu, Jiangtao Su, Jianhua Wang
Published online : 01-06-2021
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A novel, broadband, nonlinear behavioral model, based on support vector regression (SVR) is presented in this paper. The proposed model, distinct from existing SVR-based models, incorporates frequency information into its formalism, allowing the model to perform accurate prediction across a wide frequency band. The basic theory of the proposed model, along with model implementation and the model e
Graphene-based microwave coaxial antenna for microwave ablation: thermal analysis
Burak Uzman, Adem Yilmaz, Hulusi Acikgoz, Raj Mittra
Published online : 01-06-2021
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In this study, the problem of backward heating in microwave ablation technique is examined and an electromagnetic solution based on the use of high impedance graphene material is presented for its mitigation. In this context, a one-atom-thick graphene layer is added on the coaxial double slot antenna. In addition to the electromagnetic behavior, thermal effects caused by the graphene-covered anten
Compact quintuple notched-band UWB BPF with high selectivity and wide bandwidth
Lei Bai, Yiqi Zhuang, Zhibin Zeng
Published online : 01-06-2021
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In this paper, a compact quintuple notched-band ultra-wideband bandpass filter with high selectivity and wide bandwidth is proposed. The filter adopts an approximate closed-loop C-shaped stepped impedance resonator to generate triple notched bands, and uses Hilbert fractal curve slit and L-shaped resonator to create single notched band, respectively. Multiple notched-band are centered at 5.29, 6.6
A multi-slotted antenna for LTE/5G Sub-6 GHz wireless communication applications
Rezaul Azim, AKM Moinul H. Meaze, Adnan Affandi, Md Mottahir Alam, Rumi Aktar, Md S. Mia, Touhidul Alam, Md Samsuzzaman, Mohammad T. Islam
Published online : 01-06-2021
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This paper presents a low-profile multi-slotted patch antenna for long term evolution (LTE) and fifth-generation (5G) communication applications. The studied antenna comprised of a stepped patch and a ground plane. To attain the required operating band, three slots have been inserted within the patch. The insertion of the slots enhances the capacitive effect and helps the prototype antenna to achi
A miniaturized tri-band bandpass microstrip filter using multiple resonators with sharp skirts
Chenhao Wang, Xiaoli Xi, Yuchen Zhao, Xiaomin Shi
Published online : 01-06-2021
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In this paper, a miniaturized tri-band bandpass microstrip filter using stub loaded rectangular ring resonator (SLRRR)?shorted stub loaded stepped impedance resonators (SSLSIR), and stepped impedance resonators (SIR) with sharp skirts is presented. Two SSLSIRs are embedded paralleled inside SLRRR to generate a quasi-elliptic response at second and third passband. The odd-even fundamental resonant
Bandwidth enhancement of compact patch antennas by loading inverted ?L? and ?T? strips
Abdelheq Boukarkar, Rachdi Satouh
Published online : 01-06-2021
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We propose simple designs of compact patch antennas with bandwidth enhancement. Firstly, an inverted ?L? strip is loaded onto the corner of one radiating patch edge to create an additional resonant mode which can be combined with that one of the conventional patch to enhance the operating bandwidth. Secondly, the ?L? strip is replaced by inverted ?T? strip to improve further the bandwidth by creat
A millimeter-wave fundamental and subharmonic hybrid CMOS mixer for dual-band applications
Fang Zhu, Guo Qing Luo
Published online : 01-06-2021
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This paper proposes and presents a millimeter-wave (MMW) fundamental and subharmonic hybrid mixer in a 65-nm CMOS technology. Based on a hybrid structure with two switching quads and a quasi-diplexer, the proposed circuit can function either as a fundamental mixer (FM) or a subharmonic mixer (SHM) for dual-band applications. An application of the MMW hybrid mixer in a concurrent dual-band receiver
A compact double-band planar printed slot antenna for sub-6 GHz 5G wireless applications
Insha Ishteyaq, Issmat Shah Masoodi, Khalid Muzaffar
Published online : 01-06-2021
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A planar rectangular slot antenna with dual-band operation and realized higher peak gain is proposed, designed, and fabricated for sub-6 GHz 5G applications. The antenna possesses a rectangular radiating slot with the inverted stub on its upper edge excited simultaneously by a micro-strip feed line having a double folded T-shaped structure. The fabricated design is of compact size with the radiati
Binomial stub loaded compact Vivaldi antenna for superwideband applications
Abhik Gorai, Rowdra Ghatak
Published online : 01-06-2021
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A compact antipodal Vivaldi antenna with superwideband characteristics is presented in this paper. For improved matching of input impedance at lower frequency region, techniques like binomial tapering of outer edges, binomial slit loaded outer edge, and protruded binomial tapered stub loading have been adopted. The antenna operates in a wide frequency range from 2 to 20 GHz. Experimental results s
Periodic printed semi-annular substrate loaded ? mode converter
Ashish Chittora, Swati Varun Yadav
Published online : 01-06-2021
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A mode converter design using the concept of periodic substrates loading in a circular waveguide, to convert mode to mode is presented in this paper. The detailed design principle, simulation, and measurement results are included in this study. Simulation results show that the purity of output fundamental mode of the converter approaches 99.2% for an operating frequency of 3.2 GHz. The mode con
Switchable design of a frequency reconfigurable broadband whip antenna in high frequency
Hengfeng Wang, Chao Liu
Published online : 01-06-2021
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In this paper, the antenna reconfigurable technology is used to redesign a whip antenna in different sub-bands of high frequency (HF). According to the electrical characteristics of the antenna, on the one hand, two different radiation whip heights are designed to solve the problem of pattern up-warping in the high-frequency band; on the other hand, a common upper loading network and several diffe
MRF volume 13 issue 4 Cover and Back matter
Published online : 01-05-2021
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MRF volume 13 issue 4 Cover and Front matter
Published online : 01-05-2021
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Rollable metamaterial screen for magnetic resonance coupling-based high-efficiency wireless power transfer
Woosol Lee, Yong-Kyu Yoon
Published online : 01-05-2021
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This paper presents a rollable metamaterial screen for high-efficiency wireless power transfer (WPT) system based on magnetic resonance coupling, which operates at 4.5 MHz. The rollable metamaterial screen with a fully expanded area of 750 mm × 750 mm is located in the middle between transmitter and receiver coils and focuses the magnetic field and, by such a way, significantly improves power tran
Compact CPW-fed super wideband planar elliptical antenna
Umair Rafique, Sami ud Din, Hisham Khalil
Published online : 01-05-2021
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A compact co-planar waveguide (CPW) fed planar elliptical antenna has been designed and presented for super wideband (SWB) characteristics. The designed antenna has an overall size of 30 × 30 × 1.57 mm, and it consists of an elliptical patch radiator fed using a modified 50 ? CPW-fed tapered microstrip feed line. By using a semi-ring shaped structure with a tapered feed line, an impedance bandwidt
Dynamic behavioral modeling of RF power amplifiers based on decomposed piecewise machine learning technique
Jialin Cai, Justin B. King, Chao Yu, Baicao Pan, Lingling Sun, Jun Liu
Published online : 01-05-2021
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Multi-device radio frequency power amplifiers (PAs) often exhibit strongly non-linear behavior in combination with long-term memory effects, leading to an extremely challenging model development cycle. This paper presents a new, dynamic, behavioral modeling technique, based on a combination of the real-valued decomposed piecewise method and concepts from the field of machine learning. The underlyi
Analysis and design of inclined fractal defected ground-based circularly polarized antenna for CA-band applications
Sonal Gupta, Shilpee Patil, Chhaya Dalela, Binod Kumar Kanaujia
Published online : 01-05-2021
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Design of single-feed circularly polarized (CP) microstrip antenna is proposed in this article. The design employs the concept of E-shape patch with inclined fractal defected ground structure (IFDGS), which can improve the impedance bandwidth, gain, and axial ratio (AR) bandwidth. The excellent enhanced impedance bandwidth, axial ratio bandwidth, and gain are achieved by an inclined E-shaped fract
Compact dual-/tri-/quad-band bandpass filters with independently frequency-tunable and switchable passbands
Zhao Li, Litian Wang, Ming He, Xiaqing Li, Zhelong Liang, Zhipeng Wang
Published online : 01-05-2021
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This paper presents the design of frequency-tunable dual-band, tri-band and quad-band bandpass filters (BPFs). The proposed three BPFs can be independently tuned and individually switched by varying the capacitances of the varactors. In the designed tunable dual-band BPF (TD-BPF), common input/output feed lines are utilized for two tunable dual-mode resonators (TDRs). Further, three TDRs and four
Determining the input reflection coefficient of integrated antennas using over-the-air measurements under near-field conditions
A.J. van den Biggelaar, D.P.P. Daverveld, A.C.F. Reniers, A.B. Smolders, U. Johannsen
Published online : 01-05-2021
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One of the current trends in the integrated circuit (IC) development is the integration of antennas on-chip or in the package of the IC. This poses challenges in the production testing process of the packaged IC, as the antenna functionality has to be included and at least one of the signal ports cannot be accessed at a conducted manner. In order to measure the reflection coefficient of an integra
A planar triple-band monopole antenna loaded with an arc-shaped defected ground plane for WLAN/WiMAX applications
Shiquan Wang, Fanmin Kong, Kang Li, Liuge Du
Published online : 01-05-2021
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In this paper, a new printed triple-band planar antenna combing two different modified monopoles and an arc-shaped defected ground plane is proposed and studied. The used two simple monopoles consist of a rectangular ring and a rectangular patch attached a straight metal strip. And a compact arc-shaped defected ground structure is proposed and used to excite higher resonance frequency and improve
A simple method to simultaneously increase the gain and bandwidth of wearable antennas for application in medical/communications systems
Farzad Khajeh-Khalili, Ali Shahriari, Fatemeh Haghshenas
Published online : 01-05-2021
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In this paper, a simple and efficient method to increase the gain and bandwidth of the wearable antennas used in several medical/communications systems is presented. To increase the gain and bandwidth simultaneously, the triple transmission lines (TTLs) method has been used. With this method, the frequency ranges of 1.7?2.5 and 5.4?5.95 GHz are covered with dual-band responses. Also, the simulated
Phase noise performance stabilization of PLL system under dynamic vibration condition for airborne applications
Vipin Kumar, R. Sivakumar, C. S. Jayasheela, Mahadev Sarkar, Shailendra Singh
Published online : 01-05-2021
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The purpose of this paper is to disclose improved crystal based frequency source system covering design techniques and experimental methodologies for the stabilization of phase noise performance of X-band phase-locked loop (PLL) at 10.6 GHz. Phase noise performance of PLL-based unit under test (UUT) is prone to disturbance occurred in random vibration profile frequency spectrum. UUT self-resonance
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