Are un randament asemanator unei antene schelet si rezoneaza numai pe frecventa pentru care a fost construita. De aceea se impune respectarea stricta a dimensiunilor, banda de lucru fiind destul de restrinsa.
Este vorba de un cerc (fig. 270) cu lungimea λ, atacat simetric printr-un dispozitiv „T-match”. Radiaza preferential in doua directii perpendiculare pe planul cercului, punctul M avind potentialul zero.
Atit cercul, cit si dispozitivul „T-match” se realizeaza din conductor de cupru cu diametrul 4 mm. Cercul are diametrul 66 cm, iar fixarea lui pe suport se face in punctul M, cu potentialul sub zero.
Dispozitivul „T-match” are distanta fata de cerc 2 cm; deschiderea la centru XX este 2 cm. Punctele XX se fixeaza pe o placheta izolanta, unde se conecteaza linia de alimentare cu impedanta 200 Ω sau un cablu de 50 Ω, prin intermediul unui balun 1/4λ.
Lungimea bratelor este de 30 cm, pentru o impedanta de 200 Ω.
This website uses cookies to improve your experience. We'll assume you're ok with this, but you can opt-out if you wish. Cookie settingsACCEPT
Privacy & Cookies Policy
Privacy Overview
This website uses cookies to improve your experience while you navigate through the website. Out of these cookies, the cookies that are categorized as necessary are stored on your browser as they are essential for the working of basic functionalities of the website. We also use third-party cookies that help us analyze and understand how you use this website. These cookies will be stored in your browser only with your consent. You also have the option to opt-out of these cookies. But opting out of some of these cookies may have an effect on your browsing experience.
Necessary cookies are absolutely essential for the website to function properly. This category only includes cookies that ensures basic functionalities and security features of the website. These cookies do not store any personal information.
Any cookies that may not be particularly necessary for the website to function and is used specifically to collect user personal data via analytics, ads, other embedded contents are termed as non-necessary cookies. It is mandatory to procure user consent prior to running these cookies on your website.