Quasi-TEM rectangular waveguides with frequency selective surface walls: Part I - Electrical properties and geometrical characteristics
Apr 01, 2014
DOI: https://doi.org/10.1002/jnm.1954
Publisher: John Wiley & Sons, Ltd.
Electrical properties and geometrical characteristics of frequencyâ€selectiveâ€surfaceâ€loaded quasiâ€transverse electromagnetic (TEM) rectangular waveguides are investigated in detail. The properties of electrical field distributions over the cross section of waveguides at various periodical phase shift points are studied. The phenomena, in connection with artificial magnetic conductor (AMC), cavity resonance, and surface resonance, are discussed. A definition of bandwidth for AMC is proposed on the basis of the variation of average zâ€polarized electric fields along zâ€axis between two side dielectric surfaces. Standard deviation technique is used to describe the uniformity of electrical fields and cavity efficiency is defined to represent the percentage of useful cavity with uniform electrical fields. The dispersion relationship, bandwidths of AMC and single mode, and cavity efficiency for various types of AMC surfaces are examined and compared. The geometrical characteristics of quasiâ€TEM waveguides are studied in both theory and experiment. Design rules for highâ€quality quasiâ€TEM waveguides are proposed.
Other Researches
A Three-Port Polarization and Pattern Diversity Ring Antenna
In this letter, a novel design of a three-port antenna exhibiting pattern and polarization diversity characteristics is proposed. The radiating element of the proposed antenna comprises a ring loaded with periodical interdigital capacitors. The sele...
Comparison of sampling possibilities for circularly band limited two dimensional signals
Sampling of two dimensional signals is a rarely discussed aspect of signal processing. The scientific community has become used to the idea of rectangular sampling to the point that other possibilities are generally not even considered. The populari...
An efficient channel estimation and interference cancelation method for a fixed point to point (p2p) microwave link is designed and investigated; it is based on Least Mean Square (LMS) and Recursive Least Square (RLS) algorithms. The LMS and RLS alg...
SIR-based miniaturized EBG structure for millimeter-wave isolation improvement applications
A new uni-planar compact electromagnetic bandgap (EBG) structure is presented. The proposed EBG unit-cell is designed based on the stepped-impedance resonator (SIR) technique. Results show that the proposed EBG structure provides a wide frequency ba...
In-phase reflection and band-gap characteristics of EBG structure for millimeter-wave applications
Design and analysis of millimeter-wave (MMW) mushroom-like, circular-patch electromagnetic band-gap (EBG) structure is presented. The in-phase reflection and band-gap characteristics of the proposed EBG structure are investigated. Results show that ...
On the design of millimetre-wave antennas for 5G
This paper addresses the millimeter-wave antenna design aspect of the future 5G wireless systems. The paper reviews the objectives and requirements of millimeter-wave antennas for 5G. Recent advances in mm-wave antenna are reported and design guidel...
Development of a cost effective antenna radiation pattern measurement setup
This paper presents an insight on the recently developed antenna pattern measurement system at COMSATS Institute of Information Technology (CIIT), Islamabad, Pakistan. Microwave Components and Devices (MCAD) research group at CIIT has been involved ...
Cognitive Chaotic UWB-MIMO Detect-Avoid Radar for Autonomous UAV Navigation
A cognitive detect and avoid radar system based on chaotic UWB-MIMO waveform design to enable autonomous UAV navigation is presented. A Dirichlet-process-mixture-model (DPMM)-based Bayesian clustering approach to discriminate extended targets and a ...
The properties of dual mode resonance in planar SIW-based rectangular cavities are investigated and discussed. A specific mode combination of dual mode cavity presents a unique frequency response feature. With the aid of an optimization process or s...
Direct-coupled cavity bandpass filters with Chebyshev response are studied and realized, using the technique of planar substrate-integrated waveguide (SIW) for the purpose of high-density integration and cost reduction. Using a general mode-matching...
Al Ain University, in United Arab Emirates, Hosts IEEE International Workshop [Around the Globe]
https://ieeexplore.ieee.org/document/6954544/
Quasi-TEM Rectangular Waveguides with Frequency Selective Surface Walls: Part II—Physical Mechanism
The physical mechanism of quasiâ€TEM (transverse electromagnetic) waveguides with frequency selective surface (FSS) walls is established on the basis of an equivalent magnetic current technique in this paper. The equivalent magnetic current distrib...