Radiation Q and radiation efficiency of wideband small antennas and their relation to bandwidth and cut-off of spherical modes
Paper i proceeding, 2007

Resonators are traditionally characterized by their quality factor Q, which is inversely proportional to the relative bandwidth. Small antennas are often resonant, so they can be characterized by a Q, except for the fact that the correct quality measure of an antenna is rather the inverse Q. i.e. the relative bandwidth. Still, it has become common to study fundamental size limitations of small antennas in terms of a so-called radiation Q (or antenna Q). The paper explains how this intrinsic radiation Q relates to: i) the bandwidth- efficiency product of small single-resonance-type antennas, ii) the gradual cut-off of spherical waves for wideband gradual-transition-type small antennas, and iii) the number of resonances needed to cover a certain frequency band for wideband multiple-resonances-type small antennas. The paper also introduces one intrinsic radiation Q for basic single TE and TM spherical mode sources, and another for combined TE and TM sources.

Författare

Daniel Nyberg

Chalmers, Signaler och system, Kommunikationssystem, informationsteori och antenner, Antennsystem

Per-Simon Kildal

Chalmers, Signaler och system, Kommunikationssystem, informationsteori och antenner, Antennsystem

Jan Carlsson

Chalmers, Signaler och system, Kommunikationssystem, informationsteori och antenner, Antennsystem

2nd European Conference on Antennas and Propagation, EuCAP 2007; Edinburgh; United Kingdom; 11 November 2007 through 16 November 2007

11961

Ämneskategorier

Annan elektroteknik och elektronik

DOI

10.1049/ic.2007.1256

ISBN

978-086341842-6

Mer information

Skapat

2017-10-08