An efficient dipole array model for the accurate prediction of antennas radiation pattern
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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.Keywords:
Collinear antenna array
In order to obtain a radiation pattern reconfigurable antenna operating in the same frequency,a radiation pattern reconfigurable printed dipole antenna is proposed in this paper.By changing the states of the switches,the antenna can be operated as a monopole antenna with omnidirectional pattern or a dipole antenna with reflector which can radiation directional pattern.The effects of the antenna's dimension on the antenna performance are analyzed using Ansoft HFSS10.0,and then the optimized parameters are presented.In the simulated results,the operation bands at 2.34～2.64GHz,the antenna has an omnidirectional pattern at switches'off'state,it has a directional pattern at the switches'on'state.The peak gain is 6.7dB and 3.1dB at 2.45GHz.
Reconfigurable antenna
Antenna gain
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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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In this paper, a simple radiation pattern reconfigurable printed dipole antenna is proposed. By controlling the switch states, the antenna can attain omnidirectional pattern or directional pattern. Antenna performance has been greatly improved by using harmonic trap. The return loss can be reduced to around -40 dB or even lower at the resonance point. The antenna is simulated by the full-wave electromagnetic simulator. The simulated and experimental results of the proposed antenna are investigated.
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Antenna gain
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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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We have proposed a new configuration of Tapered Slot Antenna (TSA) with an improved radiation pattern. The new design has a tapered section expressed by the Fermi-Dirac distribution function. At 60 GHz, the H-plane side lobe level of the antenna is 5-dB lower than that of conventional TSA's such as Linearly Tapered Slot Antennas. We also present a new technique for reducing the width of a TSA without degradation of radiation pattern.
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Main lobe
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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.
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The terminated - waveguide slot antenna consists of a slot cut in the wall of a waveguide terminated in a known load. The gain pattern of such a slot is a function of the waveguide termination and may change markedly for different load values. The slot field can be regarded as composed of two independent field types arising from symmetric and antisymmetric electric field excitations of the slot, respectively; the relative intensities of the two excitations depend on the waveguide termination. Each of these constituent fields has its own characteristic radiation pattern, and the total gain pattern is obtained by superposition. The determination of the constituent slot fields from which the radiation fields may be computed is an extremely difficult task. it is desirable, therefore, to employ a technique which enables one to find the radiated field as a function of the incident field in the waveguide without a detailed knowledge of the slot field.
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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.
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Collinear antenna array
Main lobe
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