Planar Resonating Structures

Abstract

This chapter discusses various forms of the planar resonating structures. The planar resonators, in the formats of the microstrip, coplanar waveguide (CPW), and slot line resonators, are very important circuit elements of the planar microwave technology. The microstrip line resonators are commonly used as the filter elements. These are also used to measure the relative permittivity of a substrate. The chapter also discusses in brief the 2D‐patch resonators, fractal resonators, and dual mode resonators, and presents modeling of the step impedance, hairpin, and ring resonators. The CPW resonators are also used in the hairpin form to reduce its linear length. The slots are made in the ground plane of the CPW structures. The physical line resonators, such as the microstrip, CPW, and slot line resonators, are always coupled to the source and load. The source is connected to a line resonator in following manner: direct‐coupled resonator, capacitively/inductivity coupled resonator, and tapped line resonator.