Broadband Leaky-Wave Antenna Fed With Composite Right/Left-Handed Transmission Line

Miyama, Yoshihito; Wakino, Kikuo; Lin, Yu-De; Kitazawa, Takio

doi:10.1109/tap.2008.2005549

Cited by 6 publications

(2 citation statements)

References 19 publications

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“…There are two ways to provide broadband communications in subway tunnels: leaky feeder [11][12][13][14] and antennas [15][16][17]. Leaky feeder has been widely used for narrowband communication systems, but it has many disadvantages.…”

Section: Introductionmentioning

confidence: 99%

Propagation channel measurements and analysis at 2.4 GHz in subway tunnels

Zhang

et al. 2013

IET Microwaves, Antennas & Propagation

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The reliability of communication systems in a subway tunnel requires an absolute understanding of the propagation channel in this environment. From an insightful look at the subway channel and especially when compared with the other underground propagation environments such as mines, roads and railway tunnels, an important feature of the subway tunnel is the existence of stations in the tunnel. These stations cause extra reflection in the channel and also increase the delay spread observed. Although this effect has been largely neglected in available propagation channel literature, this is an important concept that ought to be explored. In this work, the authors present channel measurements conducted close to a station in a subway tunnel at 2.4 GHz, using a self‐developed frequency domain channel sounder. To aid the authors analysis, three typical propagation regions are defined: line‐of‐sight (LOS), non‐LOS and far‐LOS, and also use a larger observation delay window to investigate the long delay clusters caused by the existence of stations in subway tunnel. From the analysis of the power delay profile (PDP), root‐mean‐square delay spread and scattering function in the three propagation regions, the authors have been able to infer a long delay cluster of about 2 µs, which the authors attributed to multipath propagation of signal along the tunnel and reflections in the station. The Saleh–Valenzuela model is used to characterise the long clustering phenomenon observed in the PDP. The results show that the time spreading in subway tunnel is more significant because of the station compared with other underground tunnels, which leads to substantial signal distortion.

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Section: Introductionmentioning

confidence: 99%

Propagation channel measurements and analysis at 2.4 GHz in subway tunnels

Zhang

et al. 2013

IET Microwaves, Antennas & Propagation

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“…Various types of leakywave antennas have been continuously proposed alongside the development of microwave transmission lines, including the rectangular and circular waveguides [3,4], and various planar waveguides, such as parallel-plate waveguides [5], microstrip lines [6], co-planar waveguides [7] and dielectric slabs [8]. Most recently, several types of leaky-wave antennas have been developed based on the substrate integrated waveguides [9,10] and composite right/left handed (CRLH) structures [11,12]. A number of techniques have also been introduced for analysing the travelling modes along the leaky-wave antennas, including the transverse resonant method [3], variational method [5,13,14] and experimental approaches [15].…”

Section: Introductionmentioning

confidence: 99%

Periodic leaky-wave antennas fed by a modified half-mode substrate integrated waveguide

Lai

Wang

2012

IET Microw. Antennas Propag.

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This study presents two configurations of periodic leaky-wave antennas fed by a modified half-mode substrate integrated waveguide (HMSIW) where a metallised trough is employed as the waveguide's side wall. The first antenna configuration is constructed from periodically etching a row of transverse slots on the ground plane of the feeding HMSIW, whereas in the second configuration, the row of slots is cut into the HMSIW top wall. Influence of the slot length and period on the propagation constant of the fundamental space harmonic is quantitatively characterised through analytical equations, simulations and measurements of fabricated prototypes. This provides essential information towards the synthesis of more sophisticated HMSIW-fed leaky-wave antennas. The performance of the two prototypes demonstrates forward-to-backward radiation within the mono-mode regime of the feeding HMSIW. The agreement between the theoretical, numerical and experimental results validates both the overall analysis procedure and the concept of periodically slotted thru HMSIW as leaky-wave antennas.

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