Tridimensional Yagi antenna: shaping radiation pattern with a non-planar array

2010 ◽  
Vol 4 (9) ◽  
pp. 1434 ◽  
Author(s):  
J.R. Brianeze ◽  
A. Cerqueira Sodré ◽  
H.E. Hernández-Figueroa
Keyword(s):  
Radiation Pattern ◽  
Yagi Antenna ◽  
Planar Array

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.

Calculation of the radiation pattern, gain and input impedance of a Yagi antenna

1975 ◽  
Vol 11 (13) ◽  
pp. 282
Author(s):  
P.S. Hall ◽  
B. Chambers ◽  
P.A. Mcinnes
Keyword(s):  
Radiation Pattern ◽  
Input Impedance ◽  
Yagi Antenna

scholarly journals Impact of Element Spacing on the Radiation Pattern of Planar Array of Monopole Antenna

2019 ◽  
Vol 07 (10) ◽  
pp. 36-51
Author(s):  
Ofem U. Omini ◽  
Donatus E. Baasey ◽  
Sulaiman A. Adekola
Keyword(s):  
Radiation Pattern ◽  
Monopole Antenna ◽  
Planar Array

scholarly journals Planar Array Failed Element(s) Radiation Pattern Correction: A Comparison

2021 ◽  
Vol 11 (19) ◽  
pp. 9234
Author(s):  
Navaamsini Boopalan ◽  
Agileswari K. Ramasamy ◽  
Farrukh Nagi ◽  
Ammar Ahmed Alkahtani
Keyword(s):  
Radiation Pattern ◽  
Phased Arrays ◽  
Signal To Noise Ratio ◽  
Near Field ◽  
Optimization Methods ◽  
Pattern Search ◽  
Reference Pattern ◽  
Optimal Weights ◽  
Planar Array ◽  
Field Radiation

Phased arrays are widely used in different fields, such as broadcasting, radar, optics, and space communications. The principle of phased arrays is to generate a directed signal from a large number of antennas to be steered at any desired angle. This, however, increases the probability of defective elements in an array. Faulty elements in an array cause asymmetry and result in increased sidelobe levels which rigorously distort the radiation pattern. Increased sidelobe radiation wastes energy and can cause interference by radiating and receiving signals in unintended directions. Therefore, it is necessary to find a method that can provide accuracy in the radiation pattern transmitted or received in the presence of failed element(s) in an array. This paper compares the few available optimization methods, namely, simulated annealing (SA), Genetic Algorithm (GA), Particle Swarm Optimization (PSO), and Pattern Search (PS) methods. For each method, various types of failures were examined, and the most suitable techniques to recover the far-field radiation are recommended. The optimization is then carried out by selecting the optimal weights of the remaining working elements in the planar array. The optimized radiation pattern’s efficiency was evaluated by comparing the Signal to Noise Ratio (SNR) value of the optimized radiation with reference and failed radiation patterns. The PSO method showed a better performance compared to all the other methods in reducing the failed radiation pattern’s SNR value. In various types of failure tests, this method reduced the failed radiation pattern’s SNR from 1 to 10 dB. This method also successfully produced a radiation pattern that closely matches the reference pattern before any failed element(s) are presented in the array. The life cycle of a planar array system with faulty elements can be increased by optimizing the remaining active elements in the array with the PSO method. It also reduces the cost of restoring and replacing the failed elements in an array regularly. This approach also prevents near-field measurement that requires complicated processes using costly equipment.

scholarly journals Design and Analysis of a Quasi-Yagi Antenna for an Indoor Location Tracking System

Sensors ◽  
2018 ◽  
Vol 18 (12) ◽  
pp. 4246 ◽  
Author(s):  
Sun-Woong Kim ◽  
Sun-Kuk Noh ◽  
Ho-Gyun Yu ◽  
Dong-You Choi
Keyword(s):  
Radiation Pattern ◽  
Standing Wave ◽  
Tracking System ◽  
Performance Comparison ◽  
Moving Target ◽  
Location Tracking ◽  
Directivity Characteristic ◽  
Indoor Location ◽  
Yagi Antenna ◽  
Moving Line

In this paper, a quasi-Yagi antenna for an indoor location tracking system is proposed. The performance of the proposed antenna was verified by testing it using an indoor location tracking system. To improve the bandwidth and gain, two parasitic directors were added near the dipole. The performance verification of the proposed antenna is explained, along with a performance comparison of the VSWR (voltage standing wave ratio) radiation pattern and the realized gain. The proposed antenna was connected to an NVA-R661 module of Xethru Inc. for indoor location tracking. The proposed antenna exhibited a wide bandwidth of 4.36 GHz by satisfying a VSWR ≤ 2 from 5.03 to 9.39 GHz, the maximum gain was 6.46 dBi in the 8 GHz band. The radiation pattern exhibited a good directivity characteristic within the proposed band. The location tracking result of a moving target clearly describes the route of the target along a moving line.

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 Planar Array Diagnostic Tool for Millimeter-Wave Wireless Communication Systems

Electronics ◽  
2018 ◽  
Vol 7 (12) ◽  
pp. 383 ◽  
Author(s):  
Oluwole Famoriji ◽  
Zhongxiang Zhang ◽  
Akinwale Fadamiro ◽  
Rabiu Zakariyya ◽  
Fujiang Lin
Keyword(s):  
Compressive Sensing ◽  
Antenna Array ◽  
Radiation Pattern ◽  
Millimeter Wave ◽  
Diagnostic Tool ◽  
Communication Systems ◽  
Noisy Data ◽  
Far Field ◽  
Field Samples ◽  
Planar Array

In this paper, a diagnostic tool or procedure based on Bayesian compressive sensing (BCS) is proposed for identification of failed element(s) which manifest in millimeter-wave planar antenna arrays. With adequate a priori knowledge of the reference antenna array radiation pattern, a diagnostic problem of faulty elements was formulated. Sparse recovery algorithms, including total variation (TV), mixed ℓ 1 / ℓ 2 norm, and minimization of the ℓ 1 , are readily available in the literature, and were used to diagnose the array under test (AUT) from measurement points, consequently providing faster and better diagnostic schemes than the traditional mechanisms, such as the back propagation algorithm, matrix method algorithm, etc. However, these approaches exhibit some drawbacks in terms of effectiveness and reliability in noisy data, and a large number of measurement data points. To overcome these problems, a methodology based on BCS was adapted in this paper. From far-field radiation pattern samples, planar array diagnosis was formulated as a sparse signal recovery problem where BCS was applied to recover the locations of the faults using relevance vector machine (RVM). The resulted BCS approach was validated through simulations and experiments to provide suitable guidelines for users, as well as insight into the features and potential of the proposed procedure. A Ka-band ( 28.9   GHz ) 10 × 10 rectangular microstrip patch antenna array that emulates failure with zero excitation was designed for far-field measurements in an anechoic chamber. Both simulated and measured far-field samples were used to test the proposed approach. The proposed technique is demonstrated to detect diagnostic problems with fewer measurements provided the prior knowledge of the array radiation pattern is known, and the number of faults is relatively smaller than the array size. The effectiveness and reliability of the technique is verified experimentally and via simulation. In addition to a faster diagnosis and better reconstruction accuracy, the BCS-based technique shows more robustness to additive noisy data compared to other compressive sensing methods. The proposed procedure can be applied to next-generation transceivers, aerospace systems, radar systems, and other communication systems.

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