Rennings, Andreas; Liebig, Thorsten; Abielmona, S.; Caloz, Christophe; Waldow, Peter:

Tri-band and dual-polarized antenna based on composite right/left-handed transmission lines

In: 2007 European Microwave Conference : [EuMC 2007] ; Munich, Germany, 9 - 12 October 2007 ; [part of European Microwave Week 2007, EuMW 2007]
Session E20, Piscataway, NJ: IEEE Service Center (2007), S. 720 - 723
ISBN: 2-87487-001-3, 978-2-87487-001-9
Buchaufsatz / Kapitel / Fach: Elektrotechnik
Relaxing the composite right/left-handed (CRLH) balance condition enables arbitrary tri-band CRLH resonant devices. This paper presents a tri-band and dual-polarized antenna based on this principle. The proposed CRLH antenna operates in the transversally-polarized zeroth order (ZO) shunt mode (n = 0) and in the two longitudinally-polarized halfwavelength (HW) modes (n = ±1). Explicit synthesis formulas are given for the CRLH tri-band operation. A specific microstrip design using MIM (metal-insulator-metal) series capacitors and shunt stub inductors is demonstrated. In this design, the three resonant modes n = −1, n = 0 and n = +1 exhibited similar input impedances (allowing a simple feeding structure), radiation patterns and efficiencies/gains.