Abstract
Initially, ISM (Industrial, Scientific and Medical) band was being allocated to Industry, Science and Medical fields but later on various applications such as Wi-Fi, Bluetooth, cordless phone etc. have been allowed to use ISM band frequencies. Different types of antennas such as a microstrip patch antenna, helical antenna, dielectric resonator antenna etc are used for the above mentioned devices. However, due to small size and weight microstrip patch antenna become dominant in this field from last few years. In this paper various antenna designs for ISM band application have been discussed with their performance analyses from various papers on which this survey is conducted. The main aim of this survey paper is to provide a background on the researches of ISM band antenna design used for different application which would help researcher in their work.
Highlights
In the last few years there has been a significant development in antenna technologies in various fields such as Wi-Fi technology and wireless local area networks (WLAN) [1]
The performance analyses from various papers have been done and there comparison is shown by graphical representation
Bandwidth and antenna efficiency are improved in the new ISM band antennas design as compared to conventional antennas
Summary
In the last few years there has been a significant development in antenna technologies in various fields such as Wi-Fi technology and wireless local area networks (WLAN) [1]. The 5 GHz frequency ISM band is adopted in commercial Wi-Fi applications. Various researches are done from several years to improve antenna performances in different aspects for different ISM band applications. The simplest configuration of a microstrip patch antenna consists of a radiating patch on the top side of a dielectric substrate which has a ground plate on the other side. Different feed techniques such as microstrip line, coaxial probe, aperture coupling and proximity coupling are used to excite the patch antenna. Lot of work is done to improve its performances such as stacking techniques, by the use of fractal geometries, metametrials, and Defective ground plane for particular applications. For achieving desire characteristics several modifications were done in existing antenna structures some of which are being discussed in table 1
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