Multiband Printed Koch Antenna Unified with Hilbert Split-Ring Structure for Better Front-to-Back Ratio
Ajay Muthuvelan1, Ashish Raja Pillai Muthaiah2, Twinkle Gopinath Gurusamy3, Josephine Pon Gloria Jeyaraj4, C. Kalieswari5

1Ajay Muthuvelan, Department of Electronics and Communication Engineering, National Engineering College (Autonomous), Kovilpatti, Tamil Nadu, India.
2Ashish Raja Pillai Muthiah, Department of Electronics and Communication Engineering, National Engineering College (Autonomous), Kovilpatti, Tamil Nadu, India.
3Twinkle Gopinath Gurusamy, Department of Electronics and Communication Engineering, National Engineering College (Autonomous), Kovilpatti, Tamil Nadu, India.
4Josephine Pon Gloria Jeyaraj*, Department of Electronics and Communication Engineering, National Engineering College (Autonomous), Kovilpatti, Tamil Nadu, India.
5C.Kalieswari, Department of Electronics and Communication Engineering, National Engineering College (Autonomous), Kovilpatti, Tamil Nadu, India.

Manuscript received on April 05, 2020. | Revised Manuscript received on April 17, 2020. | Manuscript published on May 30, 2020. | PP: 410-415 | Volume-9 Issue-1, May 2020. | Retrieval Number: F9189038620/2020©BEIESP | DOI: 10.35940/ijrte.F9189.059120
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© The Authors. Blue Eyes Intelligence Engineering and Sciences Publication (BEIESP). This is an open access article under the CC-BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/)

Abstract: A multiband printed Koch antenna integrated with multi-band high-impedance surface (HIS) is proposed. The antenna can operate at three frequencies like 11.725 GHz, 26.155 GHz and 39.22 GHz which covers application in frequency bands namely X-band (8-12 GHz), K-band (18-27 GHz), and Ka-band (26.5-40 GHz). In order to achieve a modest design with better front-to-back ratio (FBR), gain, directivity and radiation efficiency a multi-band Hilbert split-ring HIS is presented as a reflector. The proposed HIS has an array of slotted square patches based on Hilbert curve. This arrangement provides in-phase reflection at the operating frequencies and can be presented as an artificial magnetic conductor (AMC). The antenna when integrated with HIS has an incorporated uniform profile thickness of 2 mm for different frequencies of operation. The printed Koch antenna is simulated, analyzed for various substrate thickness and is finally integrated with Hilbert split-ring HIS to obtain good FBR and radiation efficiency in all the three bands. 
Keywords: Multi-Band Antenna, High-Impedance Surface (HIS), Multi-Band HIS, Modest, Printed Koch Antenna.
Scope of the Article: Micro Strip Antenna