Article

Quasi-TEM rectangular waveguides with frequency selective surface walls: Part I - Electrical properties and geometrical characteristics

أبريل 01, 2014

DOI: https://doi.org/10.1002/jnm.1954

Publisher: John Wiley & Sons, Ltd.

Duochuan Li / Nazih Khaddaj Mallat Ke Wu

Electrical properties and geometrical characteristics of frequency‐selective‐surface‐loaded quasi‐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 z‐polarized electric fields along z‐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 quasi‐TEM waveguides are studied in both theory and experiment. Design rules for high‐quality quasi‐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...

Comparison of RLS and LMS algorithms for interference cancelation in a fixed point to point microwave link

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 ...

Development of Substrate Integrated Waveguide filters for low-cost high-density RF and microwave circuit integration: Pseudo-elliptic dual mode cavity band-pass filters

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...

Development of Substrate-Integrated Waveguide Filters for Low-Cost High-Density RF and Microwave Circuit Integration: Direct-Coupled Cavity Bandpass Filters With Chebyshev Response

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...

Quasi-TEM Rectangular Waveguides with Frequency Selective Surface Walls: Part II—Physical Mechanism

The physical mechanism of quasi‐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...