The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
A 2-turn helical antenna with small pitch angle between 0.60 and 30 has been studied as a radiation element of circular polarization waves in this paper. The antenna with pitch angle 20 exhibits a 3-dB axial ration bandwidth of 9.8%, and the optimal axial ratio of 0.1dB. When the pitch angle decreases to 0.60, the 3-dB axial ration bandwidth and the best axial ratio are 5% and 0.15dB respectively...