Modelling and Simulation of Vertical Fin Style Aluminium Heat Sink for Controlled Thermal Compensation in Absorber Loade
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NTENNA AND FEEDER DEVICES
Modelling and Simulation of Vertical Fin Style Aluminium Heat Sink for Controlled Thermal Compensation in Absorber Loaded Antenna Array S. Rania, *, A. Marwahaa, **, and S. Marwahaa, *** a
Sant Longowal Institute of Engineering and Technology, Longowal, Sangrur, PIN-148106 India *e-mail: [email protected] **e-mail: [email protected] ***e-mail: [email protected] Received May 29, 2020; revised July 10, 2020; accepted July 13, 2020
Abstract—Enhanced array performance can be achieved by increasing number of array elements but at the cost of increased side lobe levels. These sidelobes can be supressed by integrating graphene oxide based electromagnetic absorbers along with antenna array on a single substrate. Absorbers can effectively reduce the side lobe levels of array by absorbing their interelement coupling waves, the ambient temperature of array however increases as the absorbed side lobes dissipate into heat which is not desirable. Temperature compensation technique is hence proposed whereby the temperature shift is controlled by utilizing heat sink mounted absorber for improving the performance of antenna array. Keywords: graphene oxide absorber, absorption coefficient, antenna array, effective bandwidth, return loss DOI: 10.1134/S1064226920110145
INTRODUCTION The ever-growing demand of portable communication network at affordable prices requires an effective antenna array system having ability of extended signal range, spectrum efficiency, pencil beam pattern, steering beam pattern as per user location [1, 2]. In addition to above, an array system can overcome free space communication challenges like multiple channel fading, cochannel and adjacent interferences, interferences from array side lobes, bit error rate (BER) [3, 4]. Above all, the capability of array to cancel or supress the cochannel interference is of prime importance as it enables array to operate in crowded electromagnetic wave environment [5]. This can be achieved by adjusting the antenna beam pattern via feeding appropriate excitation to array elements [6]. Integration of microwave absorber with antenna array on single substrate further proves an alternative and industrially compatible approach instead of controlling array weights to serve the purpose [7, 8]. But the limitation of this technique is that as the absorber dissipates coupling waves into heat energy via absorption, the ambient temperature of array shifts toward higher side, which changes the physical dimensions of array patch as well as alters the permittivity of array substrate. These variations will cause changes in the resonance frequency, return loss, bandwidth and VSWR of array which is not desirable [9]. To solve this
problem, a heat sink mounted absorber has been proposed in this paper, which disperses heat via heat convection process and cools down the temperature of designed structure for redressing the array performance. The effect of increased temperature on absorber efficiency has been studied by many researches. Sungjun
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