60 GHz Omni-directional Segmented Loop Antenna Mohammad Hossein Ghazizadeh, and Mohammad Fakharzadeh Electrical Engineering Department, Sharif University of Technology Tehran,Iran ghazizadeh
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[email protected] Abstract—The design, simulation and fabrication of a planar antennas [2]. These antennas have a simple and small size fragmented loop antenna with capacitive loads at 60 GHz structure and are cost-efficient but on the other hand, the are frequency band is reported in this paper. The loop antenna has linearly polarized, and only omni-directional in the horizontal a nearly omni-directional radiation pattern required for many IEEE 802.11ad applications, a simulated bandwidth of 6 GHz, plane and usually have nulls in the vertical plane radiation and a realized gain of 2 dBi. The measured input matching pattern limiting the spatial coverage of the antenna. Another bandwidth without deembedding the connector effect is nearly 2 famous structure is the Omni-directional Microstrip Antenna GHz. The HPBW in azimuth plane is 360◦. Array (OMAA) [3], which is a planar antenna based on the COCO antenna concept. Although it has a planar structure I. INTRODUCTION but since it comprises of several λ/2 sections, it has a large An emerging application of 60 GHz radio systems is es- physical size. A fairly small size antenna with omni-directional tablishing a short-range wireless network inside a room. As radiation pattern is the segmented loop antenna with capacitive described in IEEE 802.11ad standard a semi-omni antenna loadings introduced in [4]. The loop antenna has a periphery of coverage is required in discovery mode so that different users approximately λ corresponding to the resonant frequency.