Optimization of Log-Periodic Dipole Array Antennas for Wideband Omnidirectional Radiation
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This communication shows that, given the correct terminal voltages on each element, a log-periodic dipole array (LPDA) can achieve an omnidirectional radiation pattern over a wide frequency bandwidth. This cannot be achieved by analytical means, but through a global search optimization strategy. An optimization method, which achieves omnidirectional radiation of the array with maximum gain deviations of less than 0.06 dB over more than 30% bandwidth, is discussed and the results are presented.Keywords:
Collinear antenna array
Wideband
An Omnidirectional Printed Dipole Array Antenna with Shaped Radiation Pattern in the Elevation Plane
Abstract An omnidirectional printed dipole array antenna (OPDAA) suitable for the vehicle loaded mobile communication in the UHF is presented in this paper. This OPDAA consists of 1 × 4 printed dipoles of identical dimensions, which are arranged symmetrically with respect to the central feed twin-lines. The parameter design, feeding method and optimization process of the proposed OPDAA are presented. Effects of the spacing among the four double-sided dipoles on the performance of the antenna are also studied in detail. The experimental results show that good omnidirectional radiation with gain variations less than 0.7 dBi in the azimuth plane and the shaped radiation pattern in the elevation plane fit for the practical application of communication have been obtained. The impedance bandwidth of VSWR<1.5 reaches 3.5% and the measured maximum antenna gain across the operating frequency band is about 6.4–6.9 dBi. Hence the OPDAA is very suitable for the vehicle loaded mobile communication particularly communicating with the aerial objects.
Collinear antenna array
Elevation (ballistics)
Antenna gain
Helical antenna
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The synthesis of a magneto-electric (ME) dipole linear array using an element-level pattern diversity (ELPD) technique is presented in this letter. This linear array with fewer elements, simple structure, and feed network can achieve similar performance of a conventional two-dimensional array because of the application of both the ELPD technique and the ME dipole element. The synthesis of the E-plane radiation pattern is achieved by the superposition of the radiation patterns of different modes with certain weighting, while the H-plane radiation pattern is achieved mainly by array factor with the same weighting. The configuration of the array is given. A three-element ME dipole array with the ELPD technique to obtain equal beamwidths in E- and H-plane is presented as an example to show the design and synthesis procedure. The measured 12.5% impedance bandwidth at a center frequency of 2.4 GHz with |S11|<;-10 dB and stable radiation patterns are achieved. The measured gain is 11.2 dBi at the frequency of 2.4 GHz. The results validate the proposed array and its synthesis procedure.
Collinear antenna array
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Results of numerical and experimental investigations of the wideband collinear antenna array with the omnidirectional radiation pattern in the azimuth plane are presented. Antenna array consists of two planar wideband dipoles operating in the 395...625 MHz band upon a criteria of VSWR<;2. Antenna array gain ranges from 3.5 to 5.5 dB. The key feature of the presented antenna is feeding network combined with the radiating elements. As a result, its low cost and technological effectiveness are achieved.
Collinear antenna array
Wideband
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In this paper, we propose a simple and efficient method to predict the far field radiation pattern of unknown antennas. In the proposed method, equivalent dipole array model is reconstructed base on the electromagnetic field measured from the near field plane of the antennas under test. And then, the far field radiation from the unknown antennas is predicted through the radiation from the equivalent dipole array. The proposed method is validated by comparing the far fields obtained from the proposed method with that from the full wave method. Good agreements are obtained, which confirms the accuracy and efficiency of the proposed method.
Collinear antenna array
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In this paper, a low-cost planar dipole array antenna with an omnidirectional radiation characteristic is presented. The proposed omnidirectional planar dipole array antenna comprises two 1/spl times/2 dipole arrays arranged back to back, and can be easily constructed by printing on both sides of a dielectric substrate. By selecting the central ground plane to have a small width (about 6 mm for operating at about 2.4 GHz), the proposed array antenna can have a good omnidirectional radiation pattern in the azimuthal plane (gain variations less than 2 dBi). Prototypes of the proposed antenna for WLAN operation in the 2.4 GHz band (2400-2484 MHz) were constructed and studied.
Collinear antenna array
Ground plane
Planar array
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An omnidirectional antenna is presented. It is composed of dipole array. This antenna operates at 2.4 GHz for WLAN. As the radiation element, the dipole has a minimized height for reducing the size of antenna. Its size is 27mm high and 75mm length. Four dipoles that encircle a metal cylinder at the radial direction form an omnidirectional element. Along the axial direction there are three omnidirectional elements with the distance of 101mm. The gain of this antenna is 7.1 dBi at 2.4 GHz and the gain variation in azimuth plane less than 0.5dB.
Collinear antenna array
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In the article development of the radiator combined with the support structure, possible for application in a system of mobile communication with vertically polarized electromagnetic waves is shown. For base stations the vertical antenna array with the omnidirectional radiation pattern in horizontal plane is developed. The system of the coordination, phasing and summation of radiators is located inside the support structure.
Horizontal plane
Radiator (engine cooling)
Collinear antenna array
Vertical plane
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In this paper, we describe 2 kinds of printed dipole arrays and compare the performances of these arrays in term of reflexion coefficient, radiation pattern and dimensions. It is interesting to design array in order to obtain better performances in term of omnidirectional radiation pattern in comparison with single element. We choose this elementary source in order to obtain compact array with good performances. These antenna arrays are designed to have omnidirectional radiation pattern with horizontal polarization. We present an application dedicated to compact base station in the last section.
Collinear antenna array
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2022 International Conference on Software, Telecommunications and Computer Networks (SoftCOM) (2020)
The design of a dipole antenna array with beam-steering capabilities as well as omnidirectional performance in the US 5G Sub 6-GHz band is reported. The single radiating element consists on a planar dipole formed by printing two arms back to back on a circular substrate. The proposed circular antenna array is composed of four dipoles with four open circuit used as switches. The pattern reconfigurability is achieved by controlling the switching states. The design processes are presented, and the structure is optimized and simulated. According to the simulated results, seven modes with a global matching bandwidth of 180MHz ($S_{11} \lt10$ dB) can be selected with high peak gain of 6dBi and good total efficiency of 89%. The omnidirectional radiation and beam-steered directional patterns (covering $360^{\circ})$ can be electronically tuned depending on the working states. The comparison to other state-of-the-art antennas shows that the proposed reconfigurable array has a compact size, high gain and easy to design. This proposed antenna is well suitable for future 5G sub-6GHz 5G compact base station.
Reconfigurability
Collinear antenna array
Reconfigurable antenna
Beam steering
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The design of a wideband, vertically polarized omnidirectional dipole antenna based on a non-uniformly segmented structure is presented. The proposed non-uniformly segmented configuration mitigates the phase change of the currents flowing in the long dipole arms, so that the reverse currents which deteriorate the radiation pattern can be avoided, and a stable omnidirectional pattern can be maintained over a wide frequency band. Simulation results show that the proposed dipole has a wide pattern bandwidth of 66%, ranging from 1.96 GHz to 3.90 GHz, with S 11 less than -10 dB. Within the band, the main lobe of the dipole remains in the broadside direction in the E-plane and the antenna achieves the desirable omnidirectional radiation pattern, with a gain flatness of less than 0.3 dB in the H-plane.
Wideband
Collinear antenna array
Main lobe
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