scholarly journals Design and Development of a Wideband Planar Yagi Antenna Using Tightly Coupled Directive Element

Micromachines ◽  
2020 ◽  
Vol 11 (11) ◽  
pp. 975
Author(s):  
Muhammad A. Ashraf ◽  
Khalid Jamil ◽  
Ahmed Telba ◽  
Mohammed A. Alzabidi ◽  
Abdel Razik Sebak
Keyword(s):  
Reflection Coefficient ◽  
Wireless Communication ◽  
Radiation Pattern ◽  
Excellent Agreement ◽  
Frequency Range ◽  
Fractional Bandwidth ◽  
Yagi Antenna ◽  
Tightly Coupled ◽  
Simulation Results ◽  
Novel Concept

In this paper, a novel concept on the design of a broadband printed Yagi antenna for S-band wireless communication applications is presented. The proposed antenna exhibits a wide bandwidth (more than 48% fractional bandwidth) operating in the frequency range 2.6 GHz–4.3 GHz. This is achieved by employing an elliptically shaped coupled-directive element, which is wider compared with other elements. Compared with the conventional printed Yagi design, the tightly coupled directive element is placed very close (0.019λ to 0.0299λ) to the microstrip-fed dipole arms. The gain performance is enhanced by placing four additional elliptically shaped directive elements towards the electromagnetic field’s direction of propagation. The overall size of the proposed antenna is 60 mm × 140 mm × 1.6 mm. The proposed antenna is fabricated and its characteristics, such as reflection coefficient, radiation pattern, and gain, are compared with simulation results. Excellent agreement between measured and simulation results is observed.

scholarly journals Rectangular Ring Antenna Excited by Circular Disc Monopole for WiMAX System

2014 ◽  
Vol 2014 ◽  
pp. 1-7
Author(s):  
Souphanna Vongsack ◽  
Chuwong Phongcharoenpanich ◽  
Sompol Kosulvit ◽  
Kazuhiko Hamamoto ◽  
Toshio Wakabayashi
Keyword(s):  
Radiation Pattern ◽  
Circular Disc ◽  
Impedance Bandwidth ◽  
Frequency Range ◽  
Compact Size ◽  
Ring Antenna ◽  
Parametric Studies ◽  
Simulation Results ◽  
Wimax System ◽  
Good Agreement

This research presents a rectangular ring antenna excited by a circular disc monopole (CDM) mounted in front of a square reflector. The proposed antenna is designed to cover a frequency range of 2.300–5.825 GHz and thereby is suitable for WiMAX applications. Multiple parametric studies were carried out using the CST Microwave Studio simulation program. A prototype antenna was fabricated and experimented. The measurements were taken and compared with the simulation results, which indicates good agreement between both results. The prototype antenna produces an impedance bandwidth (|S11|< −10 dB) that covers the WiMAX frequency range and a constant unidirectional radiation pattern (θ=0°and∅=90°). The minimum and maximum gains are 3.7 and 8.7 dBi, respectively. The proposed antenna is of compact size and has good unidirectional radiation performance. Thus, it is very suitable for a multitude of WiMAX applications.

scholarly journals The Improvement of first Iteration Log Periodic Fractal Koch Antenna with Slot Implementation

2018 ◽  
Vol 8 (4) ◽  
pp. 2564
Author(s):  
N. S. M. Yaziz ◽  
M. K. A. Rahim ◽  
F. Zubir ◽  
N. S. Nadzir ◽  
R. Dewan ◽  
...  
Keyword(s):  
Reflection Coefficient ◽  
Radiation Pattern ◽  
Digital Television ◽  
Frequency Range ◽  
Operating Bandwidth ◽  
Good Agreement

<span>In this paper, a slotted is introduced at each of the radiating elements on the 1<sup>st</sup> iteration log periodic fractal Koch antenna (LPFKA). The antenna is designed to testify the appropriate performance at UHF Digital television which operates from 4.0 GHz to 1.0 GHz. The dimension of the conventional 0<sup>th</sup> iteration LPKFA is successfully reduced by 17% with the implementation of slotted. The results show a good agreement with a stable radiation pattern across the operating bandwidth, stable gain more than 5 dBi and reflection coefficient of below -10 dB over the desired frequency range.</span>

scholarly journals Perancangan Dan Implementasi Antena Yagi 2.4 GHz Pada Aplikasi WIFI (Wireless Fidelity)

2013 ◽  
Vol 1 (1) ◽  
pp. 35
Author(s):  
BUDI PRATAMA ◽  
LITA LIDYAWATI ◽  
ARSYAD RAMADHAN DARLIS
Keyword(s):  
Wireless Communication ◽  
Radiation Pattern ◽  
Access Point ◽  
Communication Technologies ◽  
Limited Range ◽  
Antenna Gain ◽  
Average Increase ◽  
Directional Radiation ◽  
Yagi Antenna ◽  
Focused Beam

ABSTRAKPenggunaan teknologi komunikasi dengan menggunakan kabel kini sudah tergantikan oleh teknologi komunikasi tanpa kabel, dimana kebanyakan pengguna menggunakan perangkat access point yang memiliki jangkauan pancaran terbatas karena pola radiasi omnidirectional, sehingga diperlukan antena yang mempunyai pola radiasi directional untuk jangkauan pancaran yang lebih terarah. Antena yagi merupakan salah satu yang dapat digunakan untuk mengatasi masalah ini. Dalam penelitian ini, antena Yagi yang dirancang dapat diaplikasikan pada sistem WLAN. Hasil dari implementasi didapatkan bahwa antena Yagi dapat bekerja pada frekuensi kerja WLAN 2,4 GHz. Dan selainitudiperoleh level kuat medan dengan rata-rata peningkatan penguatan antena yagi terhadap antena omni sebesar 12,1 dB. Disamping itu diperoleh gain antena yagi sebesar 16 dB sedangkan hasil simulasi sebesar 10 dB, beamwidth vertikal 250 dan horizontal 260, dan bandwidth antena 150 MHz, Pada penelitian ini hasil yang didapatkan dibandingkan dengan hasil dari software vistumbler dan SuperNEC 2.9.Kata kunci: Access point, antenna yagi, directional, vistumbler, 2,4 GHz, SuperNEC 2.9ABSTRACTThe use of communication technologies by using cable technology has now been replaced by wireless communication, whichmost usersuse theaccess point device that has a limited range due to beam omnidirectional radiation pattern, so that the required antenna that has a directional radiation pattern to reach a more focused beam. Yagi antenna is one that can be used to overcome this problem. In this study, Yagi antenna is designed to be applied in WLAN system. Results obtained from the implementations that Yagi antennas can work at the operating frequency of 2.4 GHz WLAN. And besides it is obtained strong level terrain with an average increase of the antenna yagi antenna gain of 12.1dB omni. Besides, obtained yagi antenna gai nof 16 dB, while the simulation result sat 10 dB, 250 vertical and horizontal beamwidth of 260, and a bandwidth of 150 MHz antennas, In this study,the results obtained are compared with the results of the software vistumbler and SupeNEC 2.9.Keywords: Accesspoint, yagi antennas, directional, vistumbler, 2.4 GHz, SuperNEC 2.9

scholarly journals A Multiple L-Shaped Slot Loaded Antenna with Multiband Circularly Polarized for WLAN & WiMAX Applications

2019 ◽  
Vol 8 (6S) ◽  
pp. 976-980
Keyword(s):  
Wireless Network ◽  
Radiation Pattern ◽  
Frequency Band ◽  
Linear Polarization ◽  
Return Loss ◽  
Frequency Range ◽  
Ieee 802.11A ◽  
Circularly Polarized ◽  
Simulation Results ◽  
Loaded Antenna

In this paper, a compact four asymmetric Lshaped slots loaded antenna has been designed for the wireless network & WiMAX applications. The antenna consists of four asymmetrical L-shaped slots with an area of 94 mm2 , 66 mm2 , 44 mm2 & 28 mm2 respectively & probe fed provides for the excitation to the antenna. The antenna can be operated between 2.6 GHz to 5.4 GHz frequency range. The proposed antenna resonant at three different frequencies as 2.95 GHz, 4.85 GHz & 5.23 GHz & the return loss are -16.5 dB, -13.6 dB & -14.6 dB respectively. It produces one linear polarization at 2.95 GHz frequency & two circular polarizations at frequencies 4.84 GHz & 5.21 GHz. The proposed antenna finds its application in WLAN (2.94-3.05) GHz, WiMAX (4.81-4.92) GHz & IEEE 802.11a (5.15-5.35) GHz. The proposed antenna simulation results show that good radiation pattern with multi frequency band in comparison of reported designs.

Design and Development of wide beam width Antenna for Ionosphere Wireless Remote Sensing Applications

2020 ◽  
Vol 10 ◽  
Author(s):  
M. Durga Rao ◽  
I. Srinivasa Rao
Keyword(s):  
Remote Sensing ◽  
Reflection Coefficient ◽  
Radiation Pattern ◽  
Beam Width ◽  
New Approach ◽  
Wide Beam ◽  
Sensing Applications ◽  
Remote Sensing Applications ◽  
Simulation Results ◽  
Ionospheric Radar

Background: The Yagi-Uda antenna is a highly directive antenna used widely in many applications including pulsed Doppler radars to study the dynamics of the atmosphere. Yagi antennas configured in planar array configurations in phased array radars to achieve high peak powers to probe the atmosphere from troposphere. In this paper, a twoelement Yagi-Uda antenna design is presented to investigate the ionospheric irregularities from the Gadanki Ionospheric Radar Interferometer. A new approach devised for the first time to design the two element, wide beam width tilted Yagi antenna, where folded dipole acts as active driver element and reflector as parasitic element. Methods: Several design techniques have been studied and new approach has been employed in designing the antenna and simulations have been carriedout and optimized the performance at 30 MHz with 14o tilt towards geometric north from vertical (zenith) direction for the maximum back scattered echo gain. Based on the design antenna has been fabricated and the system performance has been evaluated. Detailed validation methods have been listed to validate the parameters like reflection coefficient, gain, bandwidth and front-to-back ratio. Results: The antenna is designed and simulated results with 4NEC2 provided the optimized parameters before fabrication. The measured results indicate that the antenna has a gain of 5.65dBi and a reflection coefficient of -30 dB and these results are in close agreement with the simulation results. The band width obtained is about 2MHz is very good for the ionospheric remote sensing applications. The peak power handling capability upto 1kW shows the reliable system design for continuous and long term use of the system. Conclusion: Two element wide beam width 14o tilted Yagi-Uda antenna at 30MHz has been designed, simulated and optimized. Realized system performance validated to use for ionospheric radar remote sensing application. Details of the test methodologies are explained and the same have been executed to characterize the performance of the fabricated antenna with simulation results by measuring reflection coefficient, gain, radiation pattern. All the measured results have very close agreement with the simulation results and satisfy the design requirements to fit into 30 MHz radar antenna array for dedicated ionospheric probing. In future, we intended to carry out the radiation pattern simulation of the 20x8 phased array antennas to describe the overall radiation pattern.

The Dual Piston-Shaped Monopole Antenna for Wireless Communication Applications

2015 ◽  
Vol 781 ◽  
pp. 61-64 ◽  
Author(s):  
Amnoiy Ruengwaree ◽  
Songsomsak Boonming ◽  
Watcharaphon Naktong
Keyword(s):  
Wireless Communication ◽  
Radiation Pattern ◽  
Empirical Method ◽  
Monopole Antenna ◽  
Simulation Technique ◽  
Ieee 802.16E ◽  
Ieee 802.11A ◽  
Average Gain ◽  
Optimization Parameters ◽  
Simulation Results

This paper presents the dual piston-shaped monopole antenna for wireless communication applications. The analysis of optimization parameters used the empirical method and simulation technique with CST program. The design of matching impedance of proposed antenna is 50 ohms. The applications of prototype antenna are RFID, WLAN ( IEEE 802.11a/j ) and WiMAX ( IEEE 802.16e ) system. The simulation results show the bandwidth of proposed antenna is 2.93 GHz (2.80 – 5.73 GHz) by the average gain is 4.27 dBi and radiation pattern is omni-directional.

scholarly journals Waveguide-Based Antenna Arrays for 5G Networks

2018 ◽  
Vol 2018 ◽  
pp. 1-10 ◽  
Author(s):  
Arismar Cerqueira Sodré ◽  
Igor Feliciano da Costa ◽  
Renan Alves dos Santos ◽  
Hugo Rodrigues Dias Filgueiras ◽  
Danilo Henrique Spadoti
Keyword(s):  
Reflection Coefficient ◽  
Radiation Pattern ◽  
Cellular Networks ◽  
Frequency Spectrum ◽  
Excellent Agreement ◽  
Antenna Arrays ◽  
High Performance ◽  
Dual Band ◽  
5G Networks ◽  
Millimetre Wave

This work reports the development of two high-performance waveguide-based antenna arrays for 5G cellular networks, operating in the underutilized millimetre wave (mm-wave) frequency spectrum. Two different scenarios of mm-wave communications are proposed for illustrating the applicability of the proposed arrays, which provide specific radiation patterns, namely, 12 dBi gain omnidirectional coverage in the 28 GHz band and dual-band sectorial coverage using the 28 and 38 GHz bands with gain up to 15.6 dBi. Numerical and experimental results of the array reflection coefficient, radiation pattern, and gain have been shown in an excellent agreement.

Second Iteration of Slotted Fractal Log Periodic Dipole Antenna for UHF Digital TV Band Application

2021 ◽  
Vol 20 (3) ◽  
pp. 48-52
Author(s):  
Muhammad Hafeez Rosmin ◽  
Mohamad Kamal A Rahim ◽  
Nur Syahirah Yaziz ◽  
Muhammad Naeem Iqbal ◽  
Osman Ayop ◽  
...  
Keyword(s):  
Reflection Coefficient ◽  
Radiation Pattern ◽  
High Frequency ◽  
Dipole Antenna ◽  
Digital Tv ◽  
Wet Etching ◽  
Tangent Loss ◽  
Frequency Range ◽  
Etching Technique ◽  
Good Agreement

This paper discusses the simulations and measurements of the antenna with and without slot implementation in terms of reflection coefficient (S11) and radiation pattern. The slot implementation on each of the radiating elements on the 2nd iteration log periodic fractal Koch antenna (LPFKA) was described in this paper. This method is utilised to reduce the antenna's size while also preventing the lower designated frequencies from shifting to the higher band as the iteration increases. The antenna is designed to test and observe performance in the Ultra High Frequency (UHF) band, which ranges from 0.5 GHz to 3.0 GHz. Computer Simulation Technology (CST) software is used to design and model the antenna, which was then built using the wet etching technique. The antenna's substrate is made of FR-4 laminated board with a dielectric constant of 4.6, tangent loss of 0.019, and a thickness of 1.6mm. The results demonstrate good agreement, with a steady radiation pattern over the operational bandwidth and a reflection coefficient of less than -10 dB for the frequency range of interest. The antenna is being tested with Digital TV decoder and the result is observed towards the picture of the Digital TV.

scholarly journals A Novel Ultrawideband Planar Inverted-F Antenna with Capacitive Ground Plane

2013 ◽  
Vol 2013 ◽  
pp. 1-6
Author(s):  
Haixia Liu ◽  
Fei Wang ◽  
Yang Yang ◽  
Xiaowei Shi ◽  
Long Li
Keyword(s):  
Wireless Communication ◽  
Radiation Pattern ◽  
Free Space ◽  
Input Impedance ◽  
Ground Plane ◽  
Ultra Wideband ◽  
Antenna Performance ◽  
Simulation Results ◽  
Metal Islands ◽  
Good Agreement

With the trend of the miniaturization, broadband, and integration of multisystems of wireless communication terminals, a new ultrawideband planar inverted-F antenna (PIFA) with capacitive ground plane is proposed in this paper. The capacitive ground plane is composed of a sheet of metal islands, which makes a major contribution to ultra-wideband from 2.3 GHz to 9.0 GHz by applying the capacitive compensation for input impedance of the PIFA in high-order modes frequency bands. The effect of geometric parameters of capacitive ground plane and antenna height on antenna performance is analyzed. It is found that the radiation pattern in free space and the gain of the proposed antenna also meet the demands of the wireless communication terminals. The reported antenna was fabricated and measured, and the experimental results are in good agreement with the simulation results.

scholarly journals Design Formulas for Broadband Concentric Circular-Loops Antennas

2015 ◽  
Vol 4 (1) ◽  
pp. 45 ◽  
Author(s):  
S. M. Ali Hamed ◽  
A. A. Osman
Keyword(s):  
Resonance Frequency ◽  
Standing Wave ◽  
Excellent Agreement ◽  
Frequency Band ◽  
Ground Plane ◽  
Simulation Software ◽  
Voltage Standing Wave Ratio ◽  
Fractional Bandwidth ◽  
Maximum Radius ◽  
Simulation Results

This paper presents a simple formulas for designing broadband concentric circular-loops antennas (CCLAs). The loop dimensions for widest bandwidth are expressented in terms of the resonance frequency of the driven loop. The analysis addresses both cases CCLAs with and without ground planes. The presented formulas are employed to design multiple CCLAs.  For example, a 3-elements CCLA of a maximum radius of 6.34 cm can be designed to operate with a voltage standing wave ratio (VSWR) < 2 over a frequencies band of a fractional bandwidth of 16.9% with a minimum directivity of 3.9 dB. Addionationally, a 4-elements CCLA of maximum radius of 15 cm can be design to operate in the frequency band extending from 825 MHz to 991 MHz (fractional bandwidth of 18.3%) with a VSWR < 2 and directivity higher than 5.2 dB over the entire band. Furthermore, the analysis shows that a 3-elements CCLA backed with a conducting ground plane improves the fractional bandwidth to 19.6% and directivity to 9.15 dB over the band of interest. The analytical results on designed antennas are validated with simulation results obtained by using the AN-SOF antenna simulation software. An excellent agreement is observed between analytical and AN-SOF simulations results.

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