A New Compact Coplanar Waveguide Stop Band Filter Based on Circular Shaped DGS for Microwave and Millimeters Wave Applications: Coplanar Waveguide Technology

A New Compact Coplanar Waveguide Stop Band Filter Based on Circular Shaped DGS for Microwave and Millimeters Wave Applications: Coplanar Waveguide Technology

Elmahjouby Sghir (University of Hassan 1st, Morocco), Ahmed Errkik (University of Hassan 1st, Morocco) and Mohamed Latrach (ESEO Group, France)
DOI: 10.4018/978-1-7998-0117-7.ch006

Abstract

This chapter introduces an overview of coplanar technology and the general techniques and process to improve the response and characteristics of microwave components. A new circular defected ground structure (DGS) with shaped coplanar line is investigated for compact stopband filter (SBF) for microwave and millimeter wave applications. With this structure, the response of resonant element in 20 GHz exhibits the bandstop function. The proposed DGS is also modified by introducing four symmetrical slots with L-configuration in conductor line of a coplanar circuit to improve separately the stopband and passband performances. An equivalent circuit model derived for the proposed structures will be provided.
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Overview Of Coplanar Technology

In recent years, communications systems have been continuously expanding. The gradual saturation of the frequency bands allocated, by the extraordinary explosion of mobile telecommunications market and the continuing increase in communications services, leading to the development of higher-frequency applications, particularly in the frequency domain microwaves and millimeters. This is why mainstream applications, such as satellite communications, guidance, intelligent systems ..., require permanent improvements in performance for their low realization costs, low weight and size.

The micro strip technology, which remains the most widespread, however, has some limitations for applications at millimeter wavelengths. Firstly, the additional technological steps to achieve the metalized holes are expensive. Secondly, these holes induce parasitic effects which degrade the performance of the circuits at these frequencies. Coplanar technology is another approach that allows the use of uniplanar structures with several advantages and reliability. This coplanar technology becomes attractive with increasing production volumes and its compatibility with other new technologies. This approach consists in using the uniplanar structures. However, its advantages compared to micro strip technology, such as:

  • Simplifies fabrication and lower production cost

  • It facilitates easy shunt as well as series surface mounting of active and passive devices, and

  • It eliminates the need for wraparound and via holes and (Alsanoursi et al., 2013; Aytouna et al., 2016; Boutejdar et al., 2008).

  • It reduces radiation loss (Boutejdar et al., 2016)

  • Less electromagnetic coupling between two adjacent lines and low dispersion

  • The reduction of parasitic effects (Boutejdar, 2016).

  • A small seize (Ahn et al., 2001; Browne, 1987)

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