Browsing by Author "Khalat, A."
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Item Open Access A 60 GHz beam-steering reconfigurable antenna(IEEE, 2016) Khalat, A.; Towfiq, Md. A.; Cetiner, B. A.; Ceylan, Ö.; Bıyıklı, NecmiWe present the design, microfabrication, and characterization of a multifunctional reconfigurable antenna (MRA) with beam steering capability operating at 60 GHz band (59-66 GHz). The MRA provides 3 different beam directions pertaining to: θ {-30°,0°,30°}; φ = 90° based on reconfigurable parasitic layer approach. The structure consists of three layers namely, feed, driven antenna and reconfigurable parasitic layers. The first two layers use RF and microfabrication process compatible quartz (ϵr = 3.9, tanδ = 0.0002) substrate while parasitic layer is formed on a low-cost pyrex (ϵr = 4.9, tanδ = 0.01) material with air cavities formed underneath. The upper surface of pyrex has 3×3 rectangular shaped metallic pixels, four of which are interconnected by means of switching. By judiciously controlling the switch status the beam-steering is accomplished. The simulated impedance and gain characteristics show ∼ 15% bandwidth over which the maximum realized gain remains relatively flat around ∼ 7.2 dB for all modes of operation. © 2016 IEEE.Item Open Access Broadband high-gain 60 GHz antenna array(IEEE, 2016) Towfiq, Md. A.; Khalat, A.; Cetiner, B. A.; Ceylan, Özlem; Bıyıklı, NecmiThe design, fabrication and characterization of a 2×8 patch antenna array operating in the IEEE 802.11ad frequency band (57-66 GHz) is presented. The design is based on two-layer structures, where the radiating patches placed on top substrate are fed by conductor backed coplanar waveguide (CPW)-fed loop slots, which are placed on the bottom substrate. The top layer is formed by using a low-cost pyrex (ϵr = 4.9, tani = 0.01) substrate of 500μm thickness. The pyrex is then etched away to a thickness of 100μm, where 400μm of air volume is formed underneath. This approach does not only benefit from the low-cost feature of pyrex but also exploits the low-loss nature of air. The thin layer of pyrex is solely used for mechanical support for the radiating patches while the air provides good RF-environment for the array. The bottom substrate housing the CPW feed network is an RF-compatible and microfabrication friendly quartz (ϵr = 3.9, tanδ = 0.0002) of 525μm thickness. The simulations indicate a good maximum realized gain of 19.3 dBi of which variation over ∼ 17% bandwidth is relatively constant changing from 17-19.3 dBi. © 2016 IEEE.