Home » International Journal

International Journal

Find a document written by the best international scientists in our secure database.

1382 documents found for International Journal
A miniaturized CPW-fed on-chip UWB monopole antenna with band-notch characteristics
S. Mandal, A. Karmakar, H. Singh, S. K. Mandal, R. Mahapatra, A. K. Mal
Published online : 01-02-2020
Article Access
View abstract
This paper presents the design and analysis of a miniaturized, coplanar waveguide-fed ultra-wideband monopole on-chip antenna with band-notch characteristics. By incorporating a ?U?-shaped slot in the feedline, a band-notch is realized in the frequency range of 7.9?8.4 GHz to avoid interference from the X-band uplink satellite communication system. The proposed antenna achieved good voltage standi
Effects of vibration on passive intermodulation of microwave connector
Tuanjie Li, Mingtai Li, Wangmin Zhai, Jie Jiang
Published online : 01-02-2020
Article Access
View abstract
This paper investigates the generation of passive intermodulation (PIM) in coaxial connectors during vibration. A series of experiments were designed and the simulation model and method were proposed for understanding these phenomena. We found that PIM is mainly influenced by the contact stress and contact surface roughness during vibration. Thus, a power spectral density method is presented to id
Localization of unknown electromagnetic source using 3D-antenna arrays
Sreenivasulu Pala, Srividhya Palliyani, Mohamed Himdi, Olivier Lafond, Dhanesh G. Kurup
Published online : 01-02-2020
Article Access
View abstract
In this article, we propose three-dimensional antenna systems for determining the position of electromagnetic radiation source at an unknown location. Received signal power at different antennas and position of radiation source are used as training data for Artificial Neural Network (ANN). It is found that, a well-trained ANN is computationally efficient and capable of predicting the unknown locat
A compact four-port UWB MIMO antenna with connected ground and wide axial ratio bandwidth
Sachin Kumar, Gwan Hui Lee, Dong Hwi Kim, Wahab Mohyuddin, Hyun Chul Choi, Kang Wook Kim
Published online : 01-02-2020
Article Access
View abstract
A new design method of an ultra-wideband circularly-polarized planar multiple-input-multiple-output (MIMO) antenna is presented in this paper. The proposed MIMO antenna consists of four unit cell antennas, being comprised of a microstrip feed line and a square slotted ground plane. In the proposed unit cell design, a circular stub is protruded from the ground plane strip for achieving circular pol
MRF volume 11 issue 10 Cover and Back matter
Published online : 01-12-2019
Article Access
View abstract
MRF volume 11 issue 10 Cover and Front matter
Published online : 01-12-2019
Article Access
View abstract
Behavioral modeling and digital pre-distortion techniques for RF PAs in a 3 × 3 MIMO system
Mahmoud Alizadeh, Peter Händel, Daniel Rönnow
Published online : 01-12-2019
Article Access
View abstract
Modern telecommunications are moving towards (massive) multi-input multi-output (MIMO) systems in 5th generation (5G) technology, increasing the dimensionality of the systems dramatically. In this paper, the impairments of radio frequency (RF) power amplifiers (PAs) in a 3 × 3 MIMO system are compensated in both the time and the frequency domains. A three-dimensional (3D) time-domain memory polyno
Single transistor low phase noise active dielectric resonator oscillator
Zahra Soltani, Shahrooz Asadi, Esfandiar Mehrshahi
Published online : 01-12-2019
Article Access
View abstract
In this paper, the design theory of an 8 GHz oscillator with a new structure of active dielectric resonator (DR) is presented. The new structure emphasizes on phase noise reduction by using only one active device. The proposed structure uses additional feedback from transistor to resonator in order to increase the quality factor. Measurement results report that phase noise is reduced to ?145.19 dB
A bottom-feed omni-directional circularly polarized antenna array
Xi Li, Lin Yang, Jia-Wei Zhao, Yi Liu, Fang-Zhou Sun
Published online : 01-12-2019
Article Access
View abstract
A bottom-feed omni-directional CP (circularly polarized) antenna array is proposed in this letter. The antenna array is composed of four elements (two printed ZPS (zero-phase-shift) line loops and two half-wavelength dipoles). The four elements are fed with the same phase and amplitude. The ZPS line loops provide the horizontal polarization while the dipoles provide the vertical polarization. Ther
Rectenna panel design optimization for maximum RF power utilization
Vinita Daiya, Jemimah Ebenezer, R. Jehadeesan
Published online : 01-12-2019
Article Access
View abstract
Now-a-days, far-field wireless power transfer/energy harvesting is underutilized due to the unavailability of proper methodology to design efficient system for maximum radio frequency (RF) power utilization. For efficient utilization of far-field RF energy an array/grid of rectenna, i.e. rectenna panel is required to generate the power from wireless signal. To minimize the engineering design phase
A novel defect ground structure for decoupling closely spaced -plane microstrip antenna array
Zicheng Niu, Hou Zhang, Qiang Chen, Tao Zhong
Published online : 01-12-2019
Article Access
View abstract
In this paper, a novel decoupling technique for closely spaced -plane patch antennas using defect ground structure (DGS) is proposed. The electric field coupling between the antennas is suppressed by etching DGS which consists of a pair of rectangular slots and four stubs on the ground plane. Moreover, unlike the other methods, the DGS is not etched in the middle of the antennas but loaded along t
Aperture coupled stacked patch thin film antenna for automotive radar at 77 GHz
Osama Khan, Johannes Meyer, Klaus Baur, Saeed Arafat, Christian Waldschmidt
Published online : 01-12-2019
Article Access
View abstract
A hybrid thin film multilayer antenna for automotive radar is presented in this work. A 2 × 8 aperture coupled stacked patch antenna array is realized on a single layer printed circuit board (PCB) using a novel thin film-based approach. Using a compact 180 phase difference power divider, inter-element spacing in a 2×2 sub-array is reduced. Measurement results show a 19% (67.9?82.5 GHz) impedance b
A polarization and band reconfigurable cross-slot antenna for multiband application
Kapil Saraswat, A. R. Harish
Published online : 01-12-2019
Article Access
View abstract
A polarization and band reconfigurable cross-slot antenna for multiband applications is presented in this paper. The antenna consists of four p?i?n diodes embedded in the cross-shaped slot in a ground plane and excited by a microstrip feed line. The p?i?n diodes are placed in such a way that they produce multiple bands, with linearly and circularly polarized (CP) radiation. By switching the states
Selectivity and in-band impedance enhancement of a compact slot antenna with defected ground structures
Hailong Yang, Xiaoli Xi, Lili Wang, Yuchen Zhao, Xiaomin Shi
Published online : 01-12-2019
Article Access
View abstract
In this study, a new ultra-wideband (UWB) band-edge selectivity antenna with a modified radiation slot using defected ground structure (DGS) is presented to obtain bandpass filtering reflection coefficient and gain performance. The well-designed DGS is designed on backside metallic of the substrate and can be seen as a low-pass filter that provides a good roll-off at a higher frequency. By connect
Broadband dual linear polarized (DLP) antenna array for energy harvesting system
Dalia N. Elsheakh
Published online : 01-12-2019
Article Access
View abstract
A broadband linear polarized antenna is designed for radio frequency energy harvesting. The antenna covers the frequency range from 1 up to 6 GHz with relative impedance bandwidth of 126% at ?6 dB reflection coefficient || and extended from 1.1 to 3.3 GHz and from 4.2 to 5.6 GHz at |S| ? ?10 dB. A 2 2 dual linear polarized (DLP) antenna array is designed based on the antenna element by using equa
A miniaturized dual band EBG unit cell for UWB antennas with high selective notching
Mahmoud A. Abdalla, Abdullah A. Al-Mohamadi, Ibrahim S. Mohamed
Published online : 01-12-2019
Article Access
View abstract
A high selective dual band and miniaturized electromagnetic band gap (EBG) unit cell is presented in this paper. The analysis and characterization of the new cell are explained. The modified compact EBG unit cell is based on cutting two inverted U-shaped slots inside the typical mushroom-like EBG. The modified EBG has a 70% size reduction. The dual-band functionality of the structure is confirmed
Multi-cut four-port shared radiator with stepped ground and diversity effects for WLAN application
Leeladhar Malviya, Sanjay Chouhan
Published online : 01-12-2019
Article Access
View abstract
A four-port shared radiator is proposed for 5.2 GHz wireless application using multiple-cut rectangular geometry and partially stepped ground. The difficulty in making the shared radiator structure is almost removed in the presented design, and without the help of any isolating structure, sufficient value of isolation is achieved. The proposed shared geometry produces isolation of >10 dB in the 4.
Editorial
Frank Ellinger, Tilo Meister
Published online : 01-11-2019
Article Access
View abstract
MRF volume 11 issue 9 Cover and Back matter
Published online : 01-11-2019
Article Access
View abstract
MRF volume 11 issue 9 Cover and Front matter
Published online : 01-11-2019
Article Access
View abstract
A fully reconfigurable bandpass-to-bandpass-with-embedded-stopband filter with an ultra-wide 0.09?1.41 GHz bandwidth tuning range
Bo-Zhang Lan, Yan Qu, Chen-Jiang Guo, Jun Ding
Published online : 01-11-2019
Article Access
View abstract
A varactor-based fully reconfigurable microstrip bandpass-to-bandpass-with-embedded-stopband filter is presented in this paper. This filter offers wide center frequency and bandwidth tuning flexibility under both bandpass mode and bandpass-with-embedded-stopband mode. The entire tuning ability is based on multiple mode resonator theory and external quality factor tuning structure for bandpass mode
Design of multiband circularly/linearly polarized antenna for multiple wireless (WWAN/Bluetooth/WiMAX/WLAN/Downlink Satellite System)
Manish Sharma
Published online : 01-11-2019
Article Access
View abstract
In this article, a multiband antenna for various wireless communications is proposed for WWAN, Bluetooth, WiMAX, WLAN, and Downlink satellite system. The antenna consists of a radiating patch and a rectangular ground plane with four -shaped stubs which are embedded as side arms to obtain a resonating band for WWAN (1.9GHz), Bluetooth (2.4 GHz), WiMAX (2.5, 3.5, and 5.5 GHz), and WLAN (5.5 GHz) wir
A novel dual-band filter based on single-cavity CTSRR-loaded triangular substrate-integrated waveguide
Q. F. Geng, H. J. Guo, Y. Y. Zhu, W. Huang, S. S. Deng, T. Yang
Published online : 01-11-2019
Article Access
View abstract
In this paper, a novel single-cavity triangular substrate-integrated waveguide (TSIW) dual-band filter loading a complementary triangular split ring resonator (CTSRR) is proposed, which has three transmission zeros (TZs) in the stopband in total. The dual-band response is achieved by the CTSRR and the degenerate modes of the TSIW cavity. In order to control the TZs, we propose two adjustment techn
Design criteria of X-wave launchers for millimeter-wave applications
Walter Fuscaldo, Santi C. Pavone, Davide Comite, Guido Valerio, Matteo Albani, Mauro Ettorre, Alessandro Galli
Published online : 01-11-2019
Article Access
View abstract
Bessel-beam launchers are promising and established technologies for focusing applications at microwaves. Their use in time-domain leads to the definition of a new class of devices, namely, the -wave launchers. In this work, we discuss the focusing features of such devices with a specific interest at millimeter waves. The spatial resolutions of such systems are described under a rigorous mathemati
A bi-directional dual-bandwidth microwave absorber for applications in X and Ku bands
Gobinda Sen, Santanu Das
Published online : 01-11-2019
Article Access
View abstract
This paper presents a microwave absorber with dual absorption bandwidth response based upon the direction of electromagnetic wave incident on the surface. The design unit cell comprises a staircase shape metallic patch on the top plane and an array of 2×2 meander square ring shape dual layer frequency selective surfaces (FSS) in the middle and bottom planes. The relative absorption bandwidth (RAB)
0 document found for International Journal

ArtWhere Création de site Internet