Karaaslan, Muharrem Mustafa Kemal Üniversitesi - Elektrik Elektronik Mühendisliği, Turkey , Ünal, Emin Mustafa Kemal Üniversitesi - Elektrik Elektronik Mühendisliği, Turkey , Özdemir, Enver Mustafa Kemal Üniversitesi - Elektrik Elektronik Mühendisliği, Turkey , Erdiven, Utku Mustafa Kemal Üniversitesi - Elektrik Elektronik Mühendisliği, Turkey

Enhancement of low profile antenna radiation properties using electromagnetic band gap structures

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Gain and bandwidth of broadband low-profile antennas severely deteriorate when they are placed conformally onto the conductive skins of platforms. This detrimental effect is primarily due to out-of- phase reflections from the conductive body interfering with the antenna’s self radiation. Furthermore, lateral waves launched by the antenna couple into the thin substrate placed between the antenna and the platform, giving rise to surface waves resulting in significant diffraction from the edges of the substrate. To fix these two major mechanisms degrading antenna performance, high impedance ground planes (HIGP) are designed. HIGPs made of a 2-dimensional periodic arrangement of a mushroom structure not only provide perfect-magnetic-conductor (PMC)-like reflection but also suppress the surface waves within the stop-band of the substrate modes. This study presents new geometrical shape HIGP-antenna designs and optimizations. Dipole antenna is used as low profile antenna in the research. Mushroom-like surface is being used for suppressed surface waves. However, to ensure that resulting HIGP designs will meet the criteria of low profile antenna applications, an operational frequency band of an HIGP surface is defined as the frequency region inside of which a low profile wire antenna radiates efficiently with a good return loss and radiation patterns. Operating frequency bands of these antennas over different types of optimized HIGP’s are investigated. Butterfly like HIGP and antenna designs are introduced. Broadband nature of the HIGP-antenna system designs is increased by using butterfly type HIGP.

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High Impedance Ground Plane (HIGP) , Electromagnetic Band Gap (EBG) Structures

Erciyes University Journal Of The Institute Of Science an‎d Technology

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