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Author: | Sridharan, Akshay |
Title: | Determination of Q of small antennas |
Pienten antennien Q-arvon määrittäminen | |
Publication type: | Final Project work |
Publication year: | 2011 |
Pages: | 44 Language: eng |
Department/School: | Sähkötekniikan korkeakoulu |
Main subject: | Radiotekniikka (S-26) |
Supervisor: | Vainikainen, Pertti |
Instructor: | Valkonen, Risto |
Electronic version URL: | http://urn.fi/URN:NBN:fi:aalto-201207022619 |
OEVS: | Electronic archive copy is available via Aalto Thesis Database.
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Location: | P1 Ark Aalto 1447 | Archive |
Keywords: | quality factor Q value radiation Q small antennas fundamental limits physical limitations minimum Q exact Q of antenna Chu-Harrington limit Gustafsson limit antenna bandwidth hyvyysluku Q-arvo säteilyhyvyysluku pienet antennit fundamentaalit rajoitukset minimihyvyysluku Chu-Harrington-raja Gustafsson-raja antennin kaistanleveys |
Abstract (eng): | The Q factor or quality factor is an important characterization of an antenna. The theory on Q of small antenna was originally conceived by L.J Chu as early as 1940, but it has been changing with time, it was revised by Collin, Fante, and Mclean in the 1960s to 1990s and recently by Yaghjian, Gustafsson, Thal and Best in the 2000s. There have been attempts to recently to determine the relationship between Q and the frequency bandwidth of an antenna. The relation between the realized Q and the minimum Q describes how efficiently an antenna uses its volume. The exact Q of an antenna can be determined by either from the electromagnetic fields produced by the antenna, or from the impedance of the antenna. The Minimum Q can be calculated directly from the dimensions of the antenna. In this thesis work, a literature survey on the different methods used in the determining the exact Q and minimum Q is made. |
Abstract (fin): | Hyvyysluku eli Q-arvo on antennin tärkeä ominaisuus. Teorian pienten antennien Q-arvoista kehitti alun perin L.J. Chu jo 1940-luvulla, mutta teoriaa on päivitetty ajan kuluessa. Sitä ovat korjanneet mm. Collin, Fante ja McLean 1960 - 1990 -luvuilla, sekä hiljattain Yaghjian, Thal ja Gustafsson 2000-luvulla. Viime aikoina on yritetty määrittää Q-arvon ja antennin kaistanleveyden suhdetta. Toteutuneen Q-arvon ja pienimmän mahdollisen Q-arvon suhde kuvaa, kuinka tehokkaasti antenni käyttää tilavuutensa. Antennin tarkan Q-arvon voi määrittää antennin tuottamista sähkömagneettisista kentistä tai sen voi approksimoida antennin sisäänmenoimpedanssista. Pienimmän mahdollisen Q-arvon voi laskea suoraan antennin dimensioista. Tässä opinnäytetyössä on tehty kirjallisuuskatsaus erilaisiin tapoihin määrittää sekä antennin tarkkaa Q-arvoa että pienintä mahdollista Q-arvoa. |
ED: | 2011-05-17 |
INSSI record number: 42081
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