Design and fabrication of a wideband reflectarray antenna in Ku and K bands |
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| Affiliation: | 1. Department of Electrical Engineering, Shiraz University of Technology, Shiraz, Iran;2. Mechanic Institute, Iranian Space Research Centre, Shiraz, Iran;1. ECE Dept., UCE, Osmania University, Hyderabad, Telangana State, India;2. Kshatriya College of Engg, Armoor, Nizamabad Dist., Telangana State, India;3. ECE Dept., JNTUH and Dean Academics, G. Narayanamma Institute of Technology and Science, Shaikpet, Hyderabad, India;1. Jiangsu Key Laboratory of Meteorological Observation and Information Processing, Research Center of Applied Electromagnetics, NanJing University of Information Science & Technology, China;2. Kyushu University, Japan;1. Aerospace Research Institute, Ministry of Science, Research and Technology, Tehran 1465774111, Iran;2. School of Electrical and Computer Engineering, College of Engineering, University of Tehran, Tehran 143995713, Iran |
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| Abstract: | The purpose of this paper is design of a wide band single layer reflectarray antenna using a new broadband cell. The proposed cell consists of two parts. The first part is a circular patch and the second one is a ring with some additional stubs, which are attached to the patch and ring in a symmetrical form. The circular patch and ring elements are designed at frequencies of 20 GHz and 15 GHz respectively. In order to increase the reflectarray antenna bandwidth, at first the dimensions of the patch, ring and stubs are optimized to attain uniform phase response in the frequency range from 11 GHz to 20 GHz. Then an air layer is considered under the dielectric substrate. The reflectarray antenna is designed based on this optimized wideband unit cell. A wideband horn antenna is also designed as a feed antenna for the proposed reflectarray structure. The reflectarray antenna with horn are simulated. The 1 dB gain-bandwidth of 4.66 GHz is obtained (27.4% fractional bandwidth) in the frequency band of 14.72 GHz to19.38 GHz. Finally, the reflectarray antenna is fabricated and tested. It can be seen that there is a good agreement between simulation and measurement results. |
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| Keywords: | Bandwidth Phase response Reflectarray Unit cell |
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