By Rainee N. Simons
Updated insurance of the research and functions of coplanar waveguides to microwave circuits and antennas
The special function of coplanar waveguides, instead of extra traditional waveguides, is their uniplanar building, during which the entire conductors are aligned at the similar part of the substrate. this option simplifies production and permits speedier and cheaper characterization utilizing on-wafer techniques.
Coplanar Waveguide Circuits, elements, and structures is an engineer's whole source, amassing the entire to be had facts at the topic. Rainee Simons completely discusses propagation parameters for traditional coplanar waveguides and contains useful info reminiscent of the derivation of the basic equations, actual motives, and numerical examples.
Coverage additionally contains:
- Discontinuities and circuit components
- Transitions to different transmission media
- Directional couplers, hybrids, and magic T
- Microelectromechanical structures established switches and section shifters
- Tunable units utilizing ferroelectric fabrics
- Photonic bandgap constructions
- revealed circuit antennas
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Additional resources for Coplanar Waveguide Circuits Components & Systems
The capacitances C and C are given by Eqs. 21), respectively. The capacitance C is given by K(k ) K(k ) ; . 51) is derived and is as follows: : 1 ; q ( 9 1) ; q ( 9 ). 52) The partial ﬁlling factors q and q are K(k ) q : K(k ) K(k ) q : K(k ) K(k ) K(k ) \ ; , K(k ) K(k ) K(k ) K(k ) \ ; . K(k ) K(k ) 60 Z : ( K(k ) K(k ) . 55) The height of the shield above a certain height has negligible effect on the propagation characteristics and hence its presence can be ignored.
11 presents the effect of metal thickness on and Z of conventional CPW. 1(a) and (b). These two CPW structures are designated as sandwiched CPW and CPW on a doublelayer substrate respectively. In these ﬁgures the CPW center strip conductor width S is equal to 2a and the distance of separation between the two semi-inﬁnite ground planes in 2b. Consequently the slot width W is equal to b 9 a. The two dielectric substrate thicknesses are designated as h , h and as h , h 9 h in the case of sandwiched CPW and CPW on a double-layer substrate, respectively.
In the numerical model the CPW is assumed to be housed inside a metal enclosure that is held at zero potential. Further the CPW conductor thickness, which is much smaller than the substrate thickness, is assumed to be zero. The numerical model is validated by comparing the computed Z with the experimentally measured values. 61 mm. A TDR is used to measure the FREQUENCY-DEPENDENT TECHNIQUES FOR IMPEDANCE 33 Z . The maximum difference between the measured and modeled Z values is 3 percent .
Coplanar Waveguide Circuits Components & Systems by Rainee N. Simons