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1129 documents found for International Journal
MRF volume 10 issue 8 Cover and Back matter
Published online : 01-10-2018
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MRF volume 10 issue 8 Cover and Front matter
Published online : 01-10-2018
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A triple-wideband bandpass filter with controllable bandwidths based on stub-loaded resonators
Li Gong, Yang Xiong, Fan Zhang, LiTian Wang, Yan Sun, XinJie Zhao, Ming He, Lu Ji, Xu Zhang, Bo Zhang
Published online : 01-10-2018
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In this paper, a triple-wideband bandpass filter (BPF) with controllable bandwidths based on two multi-mode stub-loaded resonators (MMSLRs) and a triple-mode resonator is presented. The MMSLR is loaded with two identical folded open-ended stubs and a T-shaped stub. Each passband of the tri-band BPF is formed by four resonant modes, which provide sufficient bandwidths to meet various application re
Substrate-integrated waveguide cross-coupled filters with mixed electric and magnetic coupling structure
Amit Ranjan Azad, Dharmendra Kumar Jhariya, Akhilesh Mohan
Published online : 01-10-2018
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This paper presents a substrate-integrated waveguide (SIW) mixed electric and magnetic coupling structure implemented on a single-layer substrate to create finite transmission zeros (TZs), which can be used to design microwave filters with higher frequency selectivity. Mixed coupling is realized by three slot-lines on the top metal plane combined with an iris-window between two adjacent SIW caviti
Modified Y-junction SIW power divider/combiner circuit
Kaijun Song, Zihang Luo, Song Guo, Maoyu Fan, Yedi Zhou
Published online : 01-10-2018
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A modified compact Y-junction substrate-integrated waveguide (SIW) four-way power divider (PD)/combiner is proposed in this paper. The proposed approach is based on the traditional Y-junction waveguide. By using direct transition structure from SIW to half-mode SIW, four-way PD that provides equal power split to all four output ports is achieved. The even- and odd-mode equivalent circuits are give
Ultra-wideband coplanar waveguide-to-asymmetric coplanar stripline transition from DC to 165 GHz
Yunfeng Dong, Tom K. Johansen, Vitaliy Zhurbenko
Published online : 01-10-2018
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This paper presents an ultra-wideband coplanar waveguide (CPW)-to-asymmetric coplanar stripline (ACPS) transition based on aluminum nitride (AlN) substrate. The concepts of designing CPW, ACPS, and CPW-to-ACPS transition are explained. In order to suppress parasitic modes, vias going through AlN substrate are added along the ground traces. The signal trace is tapered out and chamfered to reduce th
Design and realization of a self-actuated frequency-selective radome integrated with microstrip antenna
Qihui Zhou, Peiguo Liu, Bo Yi, Dingwang Yu
Published online : 01-10-2018
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In this paper, a self-actuated frequency-selective radome is presented and applied to a microstrip antenna. The radome acts as a self-triggered switchable screen to achieve adaptive electromagnetic protection in the L band. A prototype of the radome is fabricated to measure its transmission performance. The switchable characteristic is verified by a high-power radiation experiment carried out in a
Balun bandpass filter on slot-line resonators with intrinsic balanced performance in amplitude and phase
Lin-Ping Feng, Lei Zhu
Published online : 01-10-2018
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In this paper, a novel class of balun bandpass filters is presented on slot-line resonator (SLR) toward intrinsic balanced performance in amplitude and phase. The proposed balun filter consists of three inductive-coupled SLRs in the middle, one single-ended unbalanced port, and one balanced port with two terminals. According to the distinct field conversion from the slotline to the microstrip feed
Criticality mitigation in a quasi-constant coupling position independent resonant IPT network
Alex Pacini, Franco Mastri, Diego Masotti, Alessandra Costanzo
Published online : 01-10-2018
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This paper discusses some significant design issues that are faced in resonant inductive system for wireless power transfer ?on the move?. The targeted system adopts a single AC source to power a sequence of transmitting () coils, placed along the path, whose geometry is optimized to minimize the variations of coupling for every possible position. To retain a constant coupling coefficient, two n
A multi-band switchable antenna for Wi-Fi, 3G Advanced, WiMAX, and WLAN wireless applications
Sadiq Ullah, Shaheen Ahmad, Burhan A. Khan, James A. Flint
Published online : 01-10-2018
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This paper presents a hexa-band frequency reconfigurable planar antenna, printed on a 1.6 mm thicker FR 4 substrate and backed by a truncated ground plane. The given antenna operates in four different frequency modes, depending on the state of the two lumped element switches. The proposed antenna works at six frequencies, 2.10, 2.40, 3.35, 3.50, 5.28, and 5.97 GHz. These frequency bands are dedica
Axial ratio bandwidth enhancement of a circularly polarized rectangular dielectric resonator antenna
Gaurav Varshney, V. S. Pandey, R. S. Yaduvanshi
Published online : 01-10-2018
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This paper presents a new technique for the enhancement of axial ratio (AR) bandwidth of a circularly polarized dielectric resonator antenna with a single feeding. To enhance the AR bandwidth, adjacent 3-dB AR passbands are merged by inserting the notches and conductive coating in the dielectric resonator. The dimensions of the notches and conductive coating are selected in such manner that impeda
Detection of biological abnormalities using a near-field microwave microscope
Fatemeh Kazemi, Farahnaz Mohanna, Javad Ahmadi-Shokouh
Published online : 01-10-2018
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Microwave and millimeter-wave reflectometry is one of the potential techniques for the diagnosis and detection of biological abnormalities, such as subcutaneous masses or cancerous tumors in human body. In this paper, a high-quality microwave sensor based on planar misrostrip resonator is designed, fabricated, and successfully tested with different kinds of biological samples. The proposed sensor
Novel rat-race coupler design of arbitrary coupling coefficient using substrate integrated waveguide cavity
Min-Hua Ho, Yi-Hao Hong, Jen-Chih Li
Published online : 01-10-2018
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The contribution of this paper is to propose a novel rat-race hybrid coupler of arbitrary coupling coefficient. Traditionally, the rat-race hybrid couplers are built by various loop-alike transmission-lines of multiple quarter-wavelength, and in this paper, we approach the coupler design by using a circular substrate integrated waveguide (SIW) cavity (SIWC). The employed SIWC supports two mutually
Bi-layered/tri-layered bio-media in direct contact with metal diagonal horn for hyperthermia
Soni Singh, Bhagirath Sahu, S. P. Singh
Published online : 01-10-2018
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In this paper, theoretical/simulation study of specific absorption rate (SAR) and/or temperature distributions in a bi-layered bio-media (fat and muscle)/realistic tri-layered bio-media (skin, fat, and muscle layers) in direct contact with water-loaded metal diagonal horn (MDH) designed at 915 MHz are investigated. The effects of fat thickness on the input reflection coefficient, reflection coeffi
WiMAX and C bands semi-fractal circularly polarized antenna with satellite bands filtering properties
T. Sedghi, T. Aribi, A. Kalami
Published online : 01-10-2018
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A compact coplanar waveguide (CPW)-fed circular polarization (CP)-antenna for new generation applications with dual bands filtering performance along with CP feature based on unit-cell semi-fractal is proposed in this paper. The CP-antenna privileges from semi-fractal radiator causes to have a miniaturized size. The stopped bands are designed to suppress the interference with present WLAN and ITU-
Penta-band microstrip patch antenna with small frequency ratios using metamaterial for wireless applications
Praveen Chaurasia, Binod Kumar Kanaujia, Santanu Dwari, Mukesh Kumar Khandelwal
Published online : 01-10-2018
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A novel shape penta-band microstrip patch antenna is presented in this paper. The proposed antenna shows five operating frequencies and can be used for various wireless applications, i.e. 2.58 GHz for non-direct line of sight, wireless Internet service providers, and compatible with Navini Networks; 3.17 and 3.42 GHz for WiMAX; 4 GHz for C-band application such as weather radar systems; and 5.3 GH
A compact planar circularly polarized eighth-mode substrate integrated waveguide antenna
Ni Wang, Xiaowen Xu
Published online : 01-10-2018
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A compact and planar broadband circularly polarized (CP) eighth-mode substrate integrated waveguide (EMSIW) antenna is proposed in this paper. An isosceles right triangular waveguide with one electric sidewall (located on one of its catheti) and two magnetic sidewalls (located on the other two edges of the triangle) is presented to investigate the characteristics of the EMSIW. The closed-form mode
A miniaturized UWB-MIMO antenna with quadruple band-notched characteristics
Ling Wu, Yingqing Xia, Xia Cao, Zhengtao Xu
Published online : 01-10-2018
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A simple multiple-input-multiple-output (MIMO) antenna with quad-band-notched characteristics for ultra-wideband (UWB) system is proposed and tested in the article. Based on two similar radiators, the UWB-MIMO system only occupies 22 mm × 28 mm. By etching an inverted L-like meander slot, two inverted L-shaped slots, and adding a C-shaped stub beside the feeding line, four notched bands are realiz
Increasing the bandwidth of cavity-backed SIW antennas by using stacked cavities
Hiba Abdel Ali, Enrico Massoni, Lorenzo Silvestri, Maurizio Bozzi, Luca Perregrini, Ali Gharsallah
Published online : 01-10-2018
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This paper presents a technique to increase the bandwidth in substrate integrated waveguide (SIW) cavity-backed antennas, inspired by the design of cavity filters. The proposed structure consists of a slot antenna backed by two cavities, located one on top of the other and coupled through a slot. To demonstrate the bandwidth increase, a standard cavity-backed SIW antenna, with a rectangular slot e
MRF volume 10 issue 7 Cover and Back matter
Krzysztof Kulpa
Published online : 01-10-2018
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MRF volume 10 issue 7 Cover and Front matter
Krzysztof Kulpa
Published online : 01-10-2018
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Editorial
Krzysztof Kulpa
Published online : 01-10-2018
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Parylene coated waterproof washable inkjet-printed dual-band antenna on paper substrate
Sangkil Kim, Manos M. Tentzeris
Published online : 01-09-2018
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In this paper, the first reported waterproof inkjet-printed dual-band monopole antenna on the flexible organic paper substrate is presented. The antenna, which operates at 900 MHz and 2.4 GHz, is inkjet-printed on commercially available photopaper using conductive silver nano-particle ink. To protect it from ambient humidity, a 1 µm thick Parylene-C layer was deposited on top of the antenna. To ve
Closed-form model to determine the co-axial probe reactance of an equilateral triangular patch antenna
Manotosh Biswas, Mihir Dam
Published online : 01-09-2018
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A simple closed-form analytical formula is proposed to compute the probe reactance of an equilateral triangular patch antenna. The variation of the probe reactance with the variation of antenna dimension, substrate electrical parameters, and probe location is examined thoroughly. The computed values employing the present model show excellent agreement with experimental and simulation results.
Radio bearing of sources with directional antennas in urban environment
Cezary Zió?kowski, Jan M. Kelner
Published online : 01-09-2018
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This paper focuses on assessing the limitations in the direction-finding process of radio sources with directional antennas in an urbanized environment, demonstrating how signal source antenna parameters, such as beamwidth and maximum radiation direction affect bearing accuracy in non-line-of-sight conditions. These evaluations are based on simulation studies, which use measurement-tested signal p
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