Research on the propagation constant of the periodically slotted rectangular waveguide by equivalent circuit method

Abstract

The influence of the structural parameters on the propagation constant of the leaky rectangular waveguide is studied by an equivalent circuit method and the dispersion equations are derived by the theory of transmission line. Using these equations, variation of propagation constant with the structural parameters is obtained and analyzed. And the propagation constants obtained from the equivalent circuit method were compared with those from the full‐wave simulation results. Both the results show that there is a critical length of the slots, below which the propagation constant of the leaky waveguide will be larger than that of the closed waveguide. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:426–429, 2016

Right/Left-Handed Leaky Rectangular Waveguide with Broadside Radiation Property

“…In this paper, a novel periodic leaky-wave antenna based on the rectangular waveguide is designed for broadside radiation, as shown in Figure 2(a). It is found that, for periodically slotted rectangular waveguide, the slot itself can be equivalent to the inductance L s and the capacitance C s [6], which are connected in parallel, as shown in Figure 1(c). However, L s is a series inductance and C s is too small to reach balance.…”

“…However, L s is a series inductance and C s is too small to reach balance. In order to introduce the left-handed transmission line property, the interdigital slots are cut on the upper surface to produce enough series capacitance C L [6], and metal vias are set between upper and lower walls to produce enough shunt inductance L L [10]. e transverse interdigital slots and metal vias are periodically set along the waveguide.…”

“…With large numbers of mountain railways and railway tunnels built in China, the diversification of the information service is rapidly developed, which requires the real-time and reliable data transmission including pictures, sounds, and environmental parameters. Leaky rectangular waveguide with its simple structure, flexible installation, great capacity of transmission power, low transmission loss at high frequency, and many other advantages has been widely researched and applied in the wireless communication systems [1][2][3][4][5][6][7][8][9][10], particularly in some environments where uniform coverage of radio wave is needed, which can replace the traditional distributed antennas [1][2][3][4][5][6]. In some specific confined spaces, the leaky rectangular waveguide shows much more advantages in realizing uniform and stable radio wave coverage [1][2][3].…”