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1368 documents found for International Journal
MRF volume 12 issue 5 Cover and Back matter
Published online : 01-06-2020
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MRF volume 12 issue 5 Cover and Front matter
Published online : 01-06-2020
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Compact SIW directional filter using substrate integrated circular cavities
Mohammad Sajjad Bayati, Tahsin Khorand
Published online : 01-06-2020
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In this paper, a novel directional filter (DF) is proposed and implemented using substrate integrated waveguide (SIW) technology which exhibits the advantages of compact size and simple structure. The proposed DF is realized by two half mode substrate integrated waveguides (HMSIWs) and two substrate integrated circular cavity (SICC) resonators operating in the TM degenerate modes in which an apert
A corrugated G-shaped grounded ring slot antenna for wideband circular polarization
Kapil Saraswat, Trivesh Kumar, A. R. Harish
Published online : 01-06-2020
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In this paper, a wideband circularly polarized corrugated G-shaped grounded ring slot antenna is presented. The proposed antenna structure is excited using a coplanar waveguide-fed monopole antenna, which is placed inside a corrugated G-shaped grounded ring. Due to the asymmetry in the ground plane, two orthogonal modes, having equal magnitude and out of phase by 90° are excited, resulting in circ
Rain fade slope model for terrestrial microwave links
Jalel Chebil, Md. Rafiqul Islam, Al-Hareth Zyoud, Mohamed Hadi Habaebi, Hassan Dao
Published online : 01-06-2020
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The dynamic characteristic of rain fade slope is one important factor in determining the availability of a communication system, and it is very useful in the design of fade countermeasures. In the literature, many models were proposed for rain fade slope for earth-to-satellite links. However, there are no models available for rain fade point to point terrestrial microwave links. This paper propose
Design of ultra-wide tetra band phased array inverted T-shaped patch antennas using DGS with beam-steering capabilities for 5G applications
Muhammad Anas, Hifsa Shahid, Abdul Rauf, Abdullah Shahid
Published online : 01-06-2020
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A novel 1 × 4 phased array elliptical inverted T-shaped slotted sectored patch antenna with defected ground structure (DGS), resonate at proposed ultra-wide tetra band at 28, 43, 51, and 64 GHz with high gain and beam-steering capabilities is presented. An inverted T-shaped slotted stub is used with the sectored patch to achieve ultra-wideband properties. In order to resonate the antenna at four d
Design and fabrication of a novel single-layer Ka-band reflectarray antenna
M. Abdollahvand, K. Forooraghi, Jose A. Encinar, Z. Atlasbaf, E. Martinez-de-Rioja
Published online : 01-06-2020
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A novel dual-polarization, single-layer reflectarray has been designed and manufactured to operate at receive (20 GHz) and transmit (30 GHz) frequencies for Ka-band terminal antennas. The reflectarray unit cell is composed of several types of resonant elements printed on the upper side of a conductor-backed substrate, which are designed to produce a collimated beam at 20 and 30 GHz in dual polariz
Dual-polarized, monostatic antenna array with improved ? isolation for 2.4 GHz in-band full duplex applications
Haq Nawaz, Ahmad Umar Niazi, M. Abdul Basit, Furqan Shaukat, Muhammad Usman
Published online : 01-06-2020
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This paper presents a two-elements based, dual polarized, single layer, patch antenna array with improved isolation between transmit () and receive () ports for 2.4 GHz in-band full duplex (IBFD) or simultaneous transmit and receive wireless applications. The differential feeding deployed at the port effectively suppresses the coupling which is termed as self-interference from the port to achiev
Development of gallium-arsenide-based GCPW calibration kits for on-wafer measurements in the W-band
Yibang Wang, Xingchang Fu, Aihua Wu, Chen Liu, Peng Luan, Faguo Liang, Wei Zhao, Xiaobang Shang
Published online : 01-06-2020
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We present details of on-wafer-level 16-term error model calibration kits used for the characterization of W-band circuits based on a grounded coplanar waveguide (GCPW). These circuits were fabricated on a thin gallium arsenide (GaAs) substrate, and via holes, were utilized to ensure single mode propagation (i.e., eliminating the parallel-plate mode or surface mode). To ensure the accuracy of the
Low-cost thin-film passive RFID circuits and detector system
Salma El-Sawy, Wasim Nawaz, Mohamed Osama, Ahmet Tekin
Published online : 01-06-2020
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This paper discusses the design of chip-less RFID tags of a standard pocket size of 69 mm by 156 mm. These tags are based on lumped elements of copper metal traces constructed on a thin polyamide flexible substrate. Moreover, a low-cost single-chip Bluetooth detector circuit system is demonstrated. Two different detection methods: variable coil load coupling and optical light intensity detection w
Compact bandpass filter with wide-stopband using substrate integrated waveguide cavities and short-circuited coplanar line
Amit Ranjan Azad, Akhilesh Mohan
Published online : 01-06-2020
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This article presented a compact bandpass filter with wide-stopband performance. Two substrate integrated waveguide (SIW) cavities and a short-circuited coplanar line introduced between the two cavities are used to realize a compact third-order bandpass filter. The passband is generated by combining the resonant frequency of TE mode of the SIW cavities and the fundamental resonant frequency of the
Circularly polarized ACPW Fed CRLH-TL based ZOR antenna with band notch characteristics
Kalyanbrata Ghosh, Sushrut Das
Published online : 01-06-2020
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In this paper, two asymmetric co-planar waveguide (ACPW) fed circularly polarized (CP) zeroth-order resonance (ZOR) antennas (Antenna I and II) are presented using a composite right and left-handed transmission line (CRLH-TL) approach. By adding a stub on the left side of the ACPW ground and adjusting its length, circularly polarization property has been achieved in Antenna I. The simulated 3 dB a
Scattering of the H-polarized plane wave by finite and semi-infinite multilayer systems of infinite graphene strip gratings in the THz range
Mstislav E. Kaliberda, Leonid M. Lytvynenko, Sergey A. Pogarsky
Published online : 01-06-2020
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We consider the scattering and absorption of the H-polarized plane wave by finite and semi-infinite systems of layers in the THz range. Every layer consists of an infinite graphene strip grating embedded into a dielectric slab. The solution of the problem we obtain in several steps. First, with the use of the method of singular integral equations we obtain scattering matrices of a single layer. Th
MRF volume 12 issue 4 Cover and Back matter
Published online : 01-05-2020
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MRF volume 12 issue 4 Cover and Front matter
Published online : 01-05-2020
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Planar 180° hybrid coupler with non-interspersed ports for millimeter-wave applications
Jaber Moghaddasi, Ke Wu
Published online : 01-05-2020
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This paper presents a simple topology of 180° hybrid coupler with non-interspersed inputs and outputs, as opposed to the conventional rat-race topology. Such hybrid coupler topologies with inputs located on one side and outputs at the opposite side simplify the design of signal routings and module packaging when integrated with other circuits and components. It also relaxes the necessity of using
A wideband dielectric resonator antenna with switchable diversity patterns
Ahmad Abdalrazik, Adel B. Abdel-Rahman, Ahmed Allam, Mohammed Abo-Zahhad
Published online : 01-05-2020
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In this paper, a reduced-size dielectric resonator antenna with switchable diversity patterns is proposed. Ring- and linear-shaped slots are etched in the ground plane of the antenna so as to generate two modes and at a center frequency of 19 GHz. Moreover, two groups of PIN diodes are integrated into these slots to short one group of slots, and let the other group generates the required mode. T
Circularly polarized ferrite patch antenna for LEO satellite applications
E. Arnaud, L. Huitema, R. Chantalat, A. Bellion, T. Monediere
Published online : 01-05-2020
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This paper presents the capacity of an S band circularly polarized patch antenna using a ferrite material for low-earth orbiting satellites (2025?2100 MHz for TeleCommand) to obtain a semi-isotropic radiation pattern. Indeed, circularly polarized antennas are generally large and bulky which is often incompatible for spatial applications especially for small satellites. A new antenna design is prop
High-isolation diplexer based on dual-mode substrate integrated waveguide resonator
Kaijun Song, Mou Luo, Cuilin Zhong, Yuxuan Chen
Published online : 01-05-2020
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A high-isolation diplexer based on a dual-mode substrate integrated waveguide (SIW) resonator is proposed in this paper. Based on the theory of the dual-mode resonator, the miniaturized diplexers are designed by using the SIW dual-mode resonators. The superior isolation of the diplexers is obtained because the two operating modes of the dual-mode SIW resonators are not directly coupled and there i
Novel sunflower MIMO fractal antenna with low mutual coupling and dual wide operating bands
Amer T. Abed
Published online : 01-05-2020
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A novel multiple-input and multiple-output (MIMO) fractal antenna excited by a coplanar waveguide was investigated in this study. A novel technique was used to improve the isolation of 20 dB between the dual radiating elements by inserting a strip line into the outer edges of the ground plane. A sunflower structure was used to configure the antenna in three steps. At each step, an additional sunfl
Center frequency and bandwidth switchable substrate integrated waveguide filters
Fei Cheng, Ping Lu, Kama Huang
Published online : 01-05-2020
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This paper presents center frequency and bandwidth switchable substrate integrated waveguide filters loaded with PIN diodes. The diodes are added in the slot on the surface of the resonators to switch the resonant frequencies and the coupling coefficients. Although the introduction of the slot causes extra radiation loss, it is small and acceptable. The proposed center frequency switchable filter
Target range?angle estimation based on time reversal FDA-MIMO radar
Tong Mu, Yaoliang Song
Published online : 01-05-2020
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Different from traditional multiple-input and multiple-output (MIMO) radar, the frequency diverse array MIMO (FDA-MIMO) radar generates beampattern that is dependent on both range and angle, making it applicable for joint range?angle estimation of targets. In this paper, we propose a novel time reversal based FDA-MIMO (TR-FDA-MIMO) approach for target detection. Based on the time reversal theory,
A low-profile wideband circularly polarized MIMO antenna with pattern and polarization diversity
Prashant Chaudhary, Ashwani Kumar, B. K. Kanaujia
Published online : 01-05-2020
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The present work describes a unique planar low-profile wideband circularly polarized Multiple-Input and Multiple-Output (MIMO) antenna operating in the X-band, with pattern and polarization diversity over the entire axial-ratio bandwidth (ARBW). The design is unique in the sense that a simple grounded stub introduced between two linearly polarized monopole antennas has been used to realize wideban
Quintuple-mode wideband bandpass filters with improved out-of-band rejection
Musab Hameed, Gaobiao Xiao, Lina Qiu, Tayyab Hameed
Published online : 01-05-2020
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This paper presents design of quintuple-mode wideband bandpass filters, implemented with off-centered perturbed metallic cylinders in a rectangular waveguide cavity. Three perturbation cylinders are placed at the bottom of the rectangular waveguide cavity, along with a pair of perpendicularly fed coaxial lines; excite five quasi-transverse magnetic modes to realize the desired passband. The height
Dual band circular polarized bow tie slotted patch antenna over high impedance surface for WiMAX application
Kumar Goodwilll, Neha Singh, M.V. Kartikeyan
Published online : 01-05-2020
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A novel planar dual-band bow-tie slotted patch antenna backed by high-impedance surface (HIS) is designed at 2.5 and 3.5 GHz for wireless application. The antenna employs coplanar waveguide fed patch and bow-tie slot as radiating elements. The bow-tie slot enables dual-band operation for the antenna. The HIS is made asymmetric in design to make it polarization dependent. This polarization-dependen
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