Switched Beam Antenna Array With Parasitic Elements

Kamarudin, Muhammad Ramlee; Hall, Peter

doi:10.2528/pierb09011603

Cited by 22 publications

(25 citation statements)

References 20 publications

(26 reference statements)

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“…The number of beam obtained is limited to the number of shorted pin. Kamarudin et.al has introduced a disc loaded monopole array for beam control [27][28]. In this paper, they propose to make an open circuit at one parasite to form a directional beam at this element.…”

Section: Blind Adaptationmentioning

confidence: 99%

VHF adaptive antenna using the rear defogger

Kuwahara

Abdullah

2011

2011 IEEE International Symposium on Antennas and Propagation (APSURSI)

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This thesis presented the design of an adaptive bearnforming antenna using a rear defogger. The main purpose of this project is to develop the vehicular adaptive antenna for VHF band, which does not require the installation space, does not spoil the industrial design, has low cost and low power consumption. In land communication, there is no clear line of sight between transmitter and receiver. The transmitted signal might be reflected, refracted because of the building or terrain. The receiver might receive a delayed, or reflected signal instead of the original signal. Adaptive antenna is the best candidate to mitigate the multipath fading effects. However, for VHF band, conventional adaptive antenna has a drawback of a large aperture size. Therefore, in this paper a rear defogger is proposed as an aperture to overcome the size problem of using a conventional adaptive antenna. A rear defogger of a vehicle can be used as an aperture, ' 7 -3 and in order to make it compatible with ESPAR antenna, several ports have been 1 1 , provided. One port is used as an active port or output port, while other ports are connected to the variable reactor. Downhill simplex method is used as an algorithm to form the adaptive beam for the proposed antenna. This algorithm is maximized the correlation coefficients. Simplex method has been chosen because it has several advantages. Simplex method has a fast convergence time, robust beamforming, and it can be used for multi-dimensional optimization. There are several steps in simplex method for optimization; reflection, expansion, contraction, and multiple contractions. IE3D software is used to model the defogger with the car and from the IE3D results it shows that the defogger can be used as an adaptive antenna because it has low voltage standing wave ratio (VSWR) to make it operate as an antenna, low spatial cross correlation (SCC) for better diversity and has high coupling between port (CBP) for better capability of beamforming. In the analysis, the VSWR is lower than 3, SCC is lower than 0.5, and the CBP is between -6 dB to -10 dB. For numerical simulation, MATLAB is used to make a program for simplex method. From the simulation results, it shows that almost 80 % of the signals have signal to interference noise ratio (SINR) greater than 20 dB. Besides that, null is performed for incoming interference and remained high gain for the desired signal. A Rear defogger is made from heating wire, therefore it is necessary to confirm the effects of the resistivity to the antenna's performance. The effects of the resistivity has been confirm through IE3D simulator and MATLAB programming by comparing it to the copper wire. From IE3D simulator, comparison has been made for VSWR, SCC, and CBP for both resistive and copper wire. The results show that the values of VSWR, SCC, and CBP for copper and resistive wires are nearly same. A statistical analysis has been carried out for copper and resistive wire, and the analysis show that the performance of the resistive wire is slightly decrease...

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Section: Blind Adaptationmentioning

confidence: 99%

VHF adaptive antenna using the rear defogger

Kuwahara

Abdullah

2011

2011 IEEE International Symposium on Antennas and Propagation (APSURSI)

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“…One of the applications of the reconfigurable antenna is that it can desirably steer the beam pattern into many directions [7,8]. The authors in [9]presented reconfigurable antennas, which have radiated in different beam patterns by adjusting the apertures and maintaining their operating frequencies.…”

Section: Introductionmentioning

confidence: 99%

A Novel of Reconfigurable Planar Antenna Array (Rpaa) With Beam Steering Control

Ali¹,

Tan²,

Rahman³

et al. 2010

PIER B

Self Cite

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Abstract-A new antenna structure is formed by combining the concept of reconfigurable planar antenna array (RPAA) with the parasitic elements to produce beam steering patterns. The antenna has been integrated with the PIN diode switches that enable the beam to be steered in the desired direction. This has been done by changing the switch state to either on or off mode. In this work, a number of parasitic elements have been applied to the antenna, namely reflectors and directors. They are placed in between the driven elements, which is aimed to improve the beam steering angle. With such configuration, the main beam radiated by the array can be tilted due to the effect of mutual coupling between the driven elements and parasitic elements (reflectors and director). The unique property of this antenna design is that instead of fabricating all together in the same plane, the antenna's feeding network is separated from the antenna radiating elements (the patches) by an air gap distance. This allows reducing the spurious effects from the feeding line. The optimization results for the resonant frequencies of the antennas with variable air gap heights are also been studied. The antenna is made for 5.8 GHz. Good agreement is achieved between the simulation and measurement.

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“…Dinger [2] proposed a reactively steerable antenna using microstrip patch elements and used a steepest descent algorithm to maximize the output interference power without any reference signal. Several studies [3][4][5][6][7] have proposed methods to control antenna beams using switched parasitic elements.…”

Section: Introductionmentioning

confidence: 99%

Steerable Antenna Using Algorithm Based on Downhill Simplex Method

Abdullah

Kuwahara²

2011

PIER C

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Abstract-Electronically steerable passive array radiator(ESPAR) antennas are expected to gain prominence in the field of wireless communication, because they can be steered toward a desired signal and they can eliminate interference; in addition, they have a very simple architecture that has significantly low power consumption and are inexpensive to manufacture. In this paper, we proposed an ESPAR antenna that has fastest convergence time. The downhill simplex method is used to maximize the correlation coefficient between the received signal and the reference signal. The simulation results indicate that this antenna can be steered toward the desired signal if one signal is used; in addition, it can eliminate interference if two signals, namely, the desired signal and the interference are used by automatically varying the reactance values.

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Switched Beam Antenna Array With Parasitic Elements

Cited by 22 publications

References 20 publications

VHF adaptive antenna using the rear defogger

VHF adaptive antenna using the rear defogger

A Novel of Reconfigurable Planar Antenna Array (Rpaa) With Beam Steering Control

Steerable Antenna Using Algorithm Based on Downhill Simplex Method

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