scholarly journals Control Radiation Pattern for Half Width Microstrip Leaky Wave Antenna by Using PIN Diodes

2018 ◽  
Vol 8 (5) ◽  
pp. 2959
Author(s):  
Mowafak khadom Mohsen ◽  
M.S.M. Isa ◽  
Z. Zakaria ◽  
A.A.M. Isa ◽  
M. K. Abdulhameed ◽  
...  
Keyword(s):  
Radiation Pattern ◽  
Impedance Matching ◽  
Control Cell ◽  
Single Layer ◽  
Free Edge ◽  
Half Width ◽  
Main Beam ◽  
Leaky Wave ◽  
Pin Diodes ◽  
Operation Frequency

<p class="Default">In this paper, a novel design for single-layer half width microstrip leakywave antenna (HW-MLWA) is demonstrated. This model can be digitally control its radiation pattern at operation frequency and uses only two values of the bias voltage, with better impedance matching and insignificant gain variation. The scanning and controlling the radiation pattern of leaky-wave antennas (LWA) in steps at an operation frequency, by using switches PIN diodes, is investigated and a novel HW-MLWA is introduced. A control cell reconfigurable, that can be switched between two states, is the basic element of the antenna. The periodic LWA is molded by identical control cells where as a control radiation pattern is developed by combining numerous reconfigurable control cells. A gap capacitor is independently connected or disconnected in every unit cell by using a PIN diode switch to achieve fixedfrequency control radiation pattern scanning. The profile reactance at the free edge of (HW-MLWA) and thus the main lobe direction is altered by changing the states of the control cell. The antenna presented in this paper, can scan main beam between 18o to 44o at fixed frequency of 4.2 GHz with measured peak gain of 12.29 dBi.</p>

Novel and active technique for controlling the radiation pattern of the half-width microstrip leaky wave antenna array

2019 ◽  
Vol 110 ◽  
pp. 152823 ◽  
Author(s):  
Mowafak Khadom Mohsen ◽  
Mohd saari Bin Mohamad Isa ◽  
Azmi Bin Awang Md Isa ◽  
Muhannad Kaml Abdulhameed ◽  
Mothana Lafta Attiah ◽  
...  
Keyword(s):  
Antenna Array ◽  
Radiation Pattern ◽  
Half Width ◽  
Leaky Wave ◽  
Leaky Wave Antenna ◽  
Wave Antenna ◽  
Active Technique

scholarly journals ANALYSIS OF A NEW LEAKY-WAVE ANTENNA FOR W-BAND APPLICATIONS

2020 ◽  
Vol 8 (12) ◽  
pp. 358-363
Author(s):  
Charmolavy Goslavy Lionel Nkouka Moukengue ◽  
◽  
Rostand Martialy Davy Loembe Souamy ◽  
Nzonzolo a ◽  
Aristide Mankiti Fati ◽  
...  
Keyword(s):  
Radiation Pattern ◽  
Main Beam ◽  
Leaky Wave ◽  
Software Analysis ◽  
Leaky Wave Antenna ◽  
Wave Antenna ◽  
W Band

In this article, we present a dielectric leaky-wave antenna with periodic metallic patches. Its design is made using HFSS software. Analysis of the antennas radiation pattern shows that one can control the direction of the main beam and the levels of minors lobes from the diameters and numbers of the holes. This significantly reduces the weight of the antenna while improving its performance.

scholarly journals Increasing radiation power in half width microstrip leaky wave antenna by using slots technique

2022 ◽  
Vol 12 (1) ◽  
pp. 392
Author(s):  
Muhannad Kaml Abdulhameed ◽  
Sarah Rafil Hashim ◽  
Noor Kamil Abdalhameed ◽  
Ahmed Jamal Abdullah Al-Gburi
Keyword(s):  
Radiation Power ◽  
Half Width ◽  
Main Beam ◽  
Substrate Integrated Waveguide ◽  
Cross Polarization ◽  
Leaky Wave ◽  
Leaky Wave Antenna ◽  
Wave Antenna ◽  
Aerial Vehicle ◽  
Power Radiation

<p class="Default">The radiation power in the endfire is decreased while the main beam of half substrate integrated waveguide scan from broadside to endfire in a forward. The design of half-width microstrip leaky-wave antenna (HW-MLWA) has been presented in this work to increase the power radiation near endfire by using the slots technique in the radiation element. This slot leads to a decrease the cross-polarization. The proposed design comprises one element of HW-MLWA with repeated meandered square slots in the radiation element. One aspect of this antenna is generated by using a half substrate integrated waveguide with a full tapered feed line. The proposed antenna was terminated by load of 50 Ω, and feed on the other end of the antenna. Finally, the suggested design is simulated and acceptable results were found. The released gain is increased from 10.6 dBi to 12 dBi at 4.3 GHz. This design is suitable for unmanned aerial vehicle UAVs at C band application.</p>

scholarly journals Electronically beamscannable sinusoidally modulated reactance surface antenna

2019 ◽  
Vol 6 ◽  
pp. 13
Author(s):  
Doohyun Yang ◽  
Sangwook Nam
Keyword(s):  
Radiation Pattern ◽  
Design Method ◽  
Design Procedure ◽  
Main Beam ◽  
Beam Angle ◽  
Beam Direction ◽  
Leaky Wave ◽  
Input Matching ◽  
Surface Reactance

An electronically beamscannable sinusoidally modulated reactance surface (SMRS) antenna and its design procedure are investigated. The antenna is composed of capacitively modulated reactance surface whose profile is a sinusoidally varying form. This configuration generates a radiating leaky wave and the antenna's radiation pattern including beam angle and beamwidth can be controlled with different parameters of the modulated surface reactance of the SMRS period. A beamscanning characteristic of the capacitively modulated SMRS antenna is shown with the design procedure and the simulated results. Designed antenna was simulated using commercial EM tool and the result was well matched with the calculated main beam direction verifying the validity of design method. About 33° of beamcanning range was obtained with the center radiating angle of 45° at 9 GHz. Designed antenna showed reasonable input matching and efficiencies within beamscanning range of the antenna.

A compact omnidirectional to directional frequency reconfigurable antenna for wireless sensor network applications

2021 ◽  
pp. 1-12
Author(s):  
Melvin Chamakalayil Jose ◽  
Radha Sankararajan ◽  
Balakrishnapillai Suseela Sreeja ◽  
Mohammed Gulam Nabi Alsath ◽  
Pratap Kumar
Keyword(s):  
Wireless Sensor Network ◽  
Sensor Network ◽  
Radiation Pattern ◽  
Antenna System ◽  
Wireless Sensor ◽  
Dual Band ◽  
Design Parameters ◽  
Pin Diodes ◽  
Band Frequency ◽  
Directional Radiation

Abstract In the proposed research paper, a novel compact, ultra-wideband electronically switchable dual-band omnidirectional to directional radiation pattern microstrip planar printed rectangular monopole antenna (PRMA) has been presented. The proposed antenna system has an optimum size of 0.26 λ0 × 0.28 λ0. A combination of radiators, reflectors, and two symmetrical grounds does place on the same layer of the rectangular microstrip PRMA. The frequency agility and the radiation pattern from omnidirectional to directional are achieved using two SMD PIN diodes (SMP1340-04LF). The directional radiation patterns with 180° phase shifts are achieved at the C-band frequency spectrum. The parametric study of the proposed antenna system was performed for different design parameters, and the antenna characteristics were analyzed. An antenna prototype is fabricated using the printed circuit board etching method by using RMI UV laser etching and cutting tools. The measurements of the proposed antenna are conducted in an anechoic chamber to validate the simulations. There are three states of operations due to two SMD PIN diodes being used in switching circuits. In state-I, the proposed antenna radiates at 6.185 GHz (5.275–6.6 75 GHz) in the Ф = 270° direction with a gain of 2.1 dBi, whereas in state-II, it radiates at 5.715 GHz (5.05–6.8 GHz) in the Ф = 90° direction with a gain of 2.1 dBi. In state-III, the antenna exhibits the X-band frequency with center frequency at 9.93 GHz (8.845–10.49 GHz), and the omnidirectional pattern offers a gain of 4.1 dBi. The features of the proposed antenna are suitable for high-speed wireless sensor network communication in industries such as chemical reactors in oil and gas and pharmaceuticals. It is also well suited for IoT and 5G-sub-6-GHz applications.

scholarly journals Influence of pattern anisotropy on the structural behaviour of free-edge single-layer gridshells

2021 ◽  
Vol 8 (1) ◽  
pp. 119-129
Author(s):  
Fiammetta Venuti
Keyword(s):  
Single Layer ◽  
Free Edge ◽  
Boundary Structure ◽  
Structural Behaviour ◽  
Grid Pattern ◽  
Existing Building ◽  
Edge Orientation ◽  
Current Design ◽  
Service Conditions ◽  
Layer Steel

Abstract Free-edge gridshells represent the majority of built gridshells. Indeed, the gridshell reference geometry usually needs to be trimmed in order to provide building access or to insert the gridshell within an existing building, giving rise to one or more elastic boundaries. Despite the current design practice, so far a very limited number of scientific studies has been devoted to investigate the influence of elastic boundaries on the overall structural behaviour of gridshells. This paper focuses on the effects of the orientation of the boundary structure with respect to the grid direction. This is done by studying the buckling behaviour of an ideal single-layer steel gridshell, for different grid layout (quadrangular, hybrid, triangular) and orientation. The results of the parametric study demonstrate that the sensitivity of free-edge single-layer gridshells to the free-edge orientation strongly depends on the grid pattern. In particular, isotropic gridshells have shown an almost negligible influence of the free-edge orientation in terms of buckling load, in opposition to orthotropic gridshells. Moreover, the change in free-edge orientation induces significant variations of the global structural stiffness for all the layouts, resulting in possibly unacceptable displacements in service conditions.

scholarly journals A Planar Reconfigurable Radiation Pattern Dipole Antenna with Reflectors and Directors for Wireless Communication Applications

2014 ◽  
Vol 2014 ◽  
pp. 1-10 ◽  
Author(s):  
Imen Ben Trad ◽  
Jean Marie Floc’h ◽  
Hatem Rmili ◽  
M’hamed Drissi ◽  
Fethi Choubani
Keyword(s):  
Wireless Communication ◽  
Radiation Pattern ◽  
Dipole Antenna ◽  
Radiation Patterns ◽  
Pin Diodes ◽  
Dual Beam

A planar printed dipole antenna with reflectors and directors, able to steer its radiation pattern in different directions, is proposed for telecommunication applications. Starting from a dual-beam printed dipole antenna achieved by combining two elementary dipoles back to back, and by loading four PIN diodes, three modes of reconfigurable radiation patterns are achieved at the frequency 2.56 GHz thanks to switches states. A prototype of the structure was realized and characterized; an efficiency of 75% is obtained. Simulation and measured results of the results are presented and discussed.

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