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.
This is a presentation of folded-dipole plasma tube used as very high frequency (VHF) band antenna. In plasma medium, ionized gas plays the role of free electrons in traditional metallic antennas to radiate waves. Folded-dipoles have higher input impedance and closed structure that omits bothersome wiring with respect to monopoles. VHF wave is coupled to the surface of the tube via a small capacitive...
Antenna couplers test the radiation and resonance performance of devices with wide ranges of frequencies. An antenna coupler with a required frequency range of 0.3–6GHz is designed with a very shallow cavity backing of 8mm. The matching and near fields performance are improved over the frequency range with high dielectric substrate, tapered transmission matching, absorbing materials around the antenna...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.