CRLH waveguide with air-filled double-ridge corrugations

Abstract

A rectangular waveguide periodically loaded with airfilled short-circuited double ridge stubs is proposed as a composite right/left-hand guided-wave structure. The proposed structure uses the fact that double-ridge waveguides have lower cutoff frequencies as compared to rectangular waveguides with the same width. Parametric study is made on the various design parameters to investigate their effect on the LH propagation.

Electromagnetic Analysis on Propagation Characteristics of CRLH Waveguide Loaded With Double Ridge Corrugations

“…Composite right/left-handed (CRLH) transmission line (TL) structures have been studied extensively over the past decades due to their unusual properties such as supporting backward and forward wave propagations simultaneously and infinite wavelength propagation [1]. Numerous CRLH TL structures have been proposed so far, and they can be generally classified into two categories: planar structures [2][3][4][5][6][7][8][9][10] and three-dimensional (3D) waveguide structures [11][12][13][14]. Planar CRLH TLs have the advantages of low profile, low weight, low cost and easy fabrication, etc.…”

“…The CRLH waveguide adopted in this paper was first proposed in [13] with the left-handed propagation investigated using full-wave simulation. It is composed of a main rectangular waveguide with one broadwall periodically loaded by air-filled double ridge corrugations (DRCs).…”

Transmission Characteristics on Composite Right/Left-Handed Cylindrical Waveguides Constructed by the Cutoff Te and Tm Modes

“…On the other hand, to realize left-handed nature on a transmission line, a composite right/left-handed transmission line (CRLH-TL) which adds both a series capacitor and a shunt inductor to the original line was first proposed [5]. Then CRLH-TLs consisting of various shapes have been reported [6][7][8][9][10][11][12][13][14][15][16][17][18][19]. Left-handed waveguides are constructed by loading capacitive shorted stubs and inductive windows in [6,7], and also by inserting corrugations [8][9][10][11].…”

“…Left-handed waveguides are constructed by loading capacitive shorted stubs and inductive windows in [6,7], and also by inserting corrugations [8][9][10][11]. Furthermore, these waveguides are realized by combining TE evanescent mode with the negativepermeability component [12,13] and by combining TM evanescent mode with the negative-permittivity component [14]. The left-handed waveguide constructed by only metal waveguides has been proposed by using the cutoff TE-mode and cutoff TM-mode indicating negative permittivity and negative permeability, respectively [20][21][22][23][24].…”

Generalised asymptotic boundary conditions and their application to composite right/left‐handed rectangular waveguide with double‐ridge corrugations

“…However, the introduction of obstacles inside the waveguide is not suitable for many applications such as linear accelerators, let alone the fabrication complexity. The use of air-filled double-ridge (DR) stubs rather than dielectric-filled rectangular ones was proposed as a solution to this problem in [19], owing to the fact that the DR waveguides have a lower cutoff frequency compared with the corresponding rectangular waveguide having the same width. This was demonstrated in [19] by using full-wave simulations; however, neither analytical formulation to describe the modal behaviour nor insight into the physics of the problem was introduced.…”