By Ingo Wolff
The instruments and methods to completely leverage coplanar technologyCoplanar Microwave built-in Circuits units forth the theoretical underpinnings of coplanar waveguides and punctiliously examines a few of the coplanar parts corresponding to discontinuities, lumped parts, resonators, couplers, and filters, that are crucial for microwave built-in circuit layout. in keeping with the result of his personal examine findings, the writer successfully demonstrates the various benefits of coplanar waveguide expertise for contemporary circuit design.Following a quick introductory bankruptcy, the textual content completely covers the fabric wanted for winning layout and consciousness of coplanar microwave circuits, including:* primary transmission homes of coplanar waveguides utilizing an entire wave research* targeted research of so much discontinuities utilized in coplanar waveguide layout* Lumped parts in coplanar expertise which are wanted in circuit layout* improvement of software program for coplanar circuit layout, together with a CD-ROM containing a try out model of the software program for modeling coplanar circuit parts and circuits* program of derived effects to construct extra complicated elements akin to lumped point filters, waveguide filters, millimeter wave filters, end-coupled waveguide buildings, waveguide couplers, and Wilkinson couplers for various frequency levels in coplanar technologyThe ultimate bankruptcy makes a speciality of unique coplanar microwave built-in circuits which were constructed utilizing the software program provided within the textual content. The ebook concludes with a thought-provoking dialogue of the benefits and downsides of the coplanar technique.Extensive use of figures and tables is helping readers simply digest and visualize complicated options. A bibliography is incorporated on the finish of every bankruptcy for extra research and research.Coplanar Microwave built-in Circuits is usually recommended for graduate scholars and engineers in RF microwaves who are looking to obtain the entire merits and chances of coplanar expertise.
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Extra info for Coplanar Microwave Integrated Circuits
11. 0 50 150 250 350 450 550 650 750 wg (μm) Fig. 10. Dependence of the effective dielectric constant of a coplanar waveguide on the width of the ground planes for the even mode and the odd mode. Line parameters: w = 75 μm, s = 50 μm, h = 410 μm. 9, f = 1 GHz. 22 TRANSMISSION PROPERTIES OF COPLANAR WAVEGUIDES 25 even mode 20 a (dB/m) 15 10 odd mode 5 0 50 150 250 350 450 550 650 750 wg (μm) Fig. 11. Dependence of the attenuation coefﬁcient of the even mode and the odd mode on a coplanar waveguide on the ﬁnite ground plane width wg.
Hence, two requirements are always very important in microwave circuit design: (1) the increase of the component density inside the circuits and (2) the increase of the resonant frequencies of the used lumped components such as spiral inductors, interdigital and MIM (metal–insulator–metal) capacitors, and lumped resistors. Because of the missing backside metallization and thereby the reduced parasitic ground capacitances in coplanar technology (if applied in this way), the resonant frequencies of lumped elements can be shifted to very high frequencies (>50 GHz).
In a case of a very thin substrate and an air region below it, a small part of the ﬁeld may also ﬁll this air region. In a well-designed case of a coplanar waveguide, the ﬁelds of the even mode are kept close to the gaps and this situation does not change much with frequency, especially not if the slot width s is small. If the height of the dielectric carrier material is large or if there is no air region under the substrate, then the effective dielectric constant of the even mode as a ﬁrst approximation is given by e eff ≈ er + 1 .