Conformal CPW Folded Slot Antenna Array on Kapton Substrate at North Dakota State University

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The study conducted at North Dakota State University involves the design and analysis of a conformal CPW folded slot antenna array printed on a Kapton substrate. The research covers topics such as introduction, background, design guidelines, and measurement results. Various parameters of the antenna array, simulation results, and impedance matching behavior are discussed. The resonant frequency, bandwidth, and field patterns on a conformal surface are also evaluated, providing insights into the antenna's performance and applicability.

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NORTH DAKOTA STATE UNIVERSITY A Conformal CPW Folded Slot Antenna A Conformal CPW Folded Slot Antenna Array Printed on a Array Printed on a Kapton Kapton Substrate Substrate MasudA. Aziz Sayan Roy* Layne A. Berge Irfanullah Sanjay Nariyal Benjamin D. Braaten Department of Electrical and Computer Engineering North Dakota State University Fargo, ND, USA APPLIED ELECTROMAGNETICS LAB

NORTH DAKOTA STATE UNIVERSITY Topics 1) Introduction and Background 2) Conformal CPW Folded Slot Array 3) Measurement and Simulation Results 4) Proposed Design Guidelines 5) Conclusion APPLIED ELECTROMAGNETICS LAB

NORTH DAKOTA STATE UNIVERSITY Introduction and Background Schematic of the CPW (Co Planar Waveguide) fed single folded slot antenna [1]: [1] D. E. Anagnostou and A. A. Gheethan, A coplanar reconfigurable folded slot antenna without bias network for WLAN applications, , IEEE Antennas And Wireless Propagation Letters, vol. 8, pp. 1057-1060, Sep. 2009. APPLIED ELECTROMAGNETICS LAB

NORTH DAKOTA STATE UNIVERSITY Conformal CPW Folded Slot Array b = 5.00 mm, s = 61.00 mm, ws = 21.37 mm, Ls = 43.40 mm, r = 41.80 mm, d = 2.00 mm, g = 0.63 mm, m = 1.79 mm, n = 0.71 mm, Lf= 2.77 mm, Substrate Thickness : 0.05 mm Dielectric Permittivity: 2.91 P = 43.5 mm and Q = 160.5 mm. APPLIED ELECTROMAGNETICS LAB

NORTH DAKOTA STATE UNIVERSITY Measurement and Simulation Results Printed two-element CPW folded slot antenna array on 2 mil Kapton substrate APPLIED ELECTROMAGNETICS LAB

NORTH DAKOTA STATE UNIVERSITY Measurement and Simulation Results Prototype antenna diagram with a bend angle of b on a conformal surface (wedge) APPLIED ELECTROMAGNETICS LAB

NORTH DAKOTA STATE UNIVERSITY Measurement and Simulation Results The resonant frequency was measured to be 3.29 GHz with a 10dB bandwidth of 250 MHz for b =0 . A good impedance match can be observed for each bend angle. The impedance match of the antenna is essentially independent of b below 45 . APPLIED ELECTROMAGNETICS LAB

NORTH DAKOTA STATE UNIVERSITY The measured and simulated normalized field patterns on a conformal surface with b = 0 in x-z plane in y-z plane APPLIED ELECTROMAGNETICS LAB

NORTH DAKOTA STATE UNIVERSITY Measurement and Simulation Results Prototype antenna diagram with a bend angle of b on a conformal surface (wedge) APPLIED ELECTROMAGNETICS LAB

NORTH DAKOTA STATE UNIVERSITY Comparison of the measured normalized field pattern in the x-z plane on a conformal surface with b = 0 APPLIED ELECTROMAGNETICS LAB

NORTH DAKOTA STATE UNIVERSITY Comparison of the measured normalized field pattern in the x-z plane on a conformal surface with b = 30 APPLIED ELECTROMAGNETICS LAB

NORTH DAKOTA STATE UNIVERSITY Comparison of the measured normalized field pattern in the x-z plane on a conformal surface with b = 45 APPLIED ELECTROMAGNETICS LAB

NORTH DAKOTA STATE UNIVERSITY Measurement and Simulation Results APPLIED ELECTROMAGNETICS LAB

NORTH DAKOTA STATE UNIVERSITY Proposed Design Guidelines b = 5.00 mm, Changes in Geometry s = 61.00 mm, ws = 21.37 mm, Ls = 43.40 mm, r = 41.80 mm, d = 2.00 mm, g = 0.63 mm, m = 1.79 mm, n = 0.71 mm, Lf= 2.77 mm, Changed Parameters: ws , Ls , r , one at a time P = 43.5 mm and Q = 160.5 mm. APPLIED ELECTROMAGNETICS LAB

NORTH DAKOTA STATE UNIVERSITY Proposed Design Guidelines Effect of changes in ws (slot height) Observation: S11 can be improvised by increasing the dimension of the radiating slot of the antenna. Advantage: A better S11 can be obtained without changing the overall dimension of the antenna APPLIED ELECTROMAGNETICS LAB

NORTH DAKOTA STATE UNIVERSITY Proposed Design Guidelines Effect of changes in Ls (slot width) Observation: A second resonance point at 2.3 GHz has been found without any changes of the default characteristics of the antenna Advantage: Dual-band characteristics can be achieved without changing the overall dimension of the antenna APPLIED ELECTROMAGNETICS LAB

NORTH DAKOTA STATE UNIVERSITY Proposed Design Guidelines Effect of changes in r (size of the dipole) Observation: The resonance frequency can be changed by decreasing the size of the dipole exciting the radiating slot of the antenna Advantage: The overall radiating frequency can be decreased without changing the overall dimension of the antenna APPLIED ELECTROMAGNETICS LAB

NORTH DAKOTA STATE UNIVERSITY Conclusion Introduction and Background on the CPW-fed slot antenna has been discussed. Conformal CPW-fed slot antenna array has been introduced. Measurement and Simulation Results are compared for different bend angles of the surface of the antenna. New design guidelines have been proposed for the improvisation of the antenna characteristics. APPLIED ELECTROMAGNETICS LAB