rational multiples of the natural frequency fXO of a crystal oscillator, andcan be generated using a phase locked loop, as shown in Figure 4.2. Detaileddescription of the operation of a PLL does not fall within our agenda (ofdeveloping optimal estimators) in this chapter, but we briefly interpret thePLL as an ML estirent systems. Figure 5.4 provides the radiation efficiency of the structure without dielectric,Filter ResponseDisplays the magnitude response for thecurrent filter specifications and design method by opening the FilterVisualization Tool (fvtool) from Signal Processing Toolbox software.For more information about FVTool, refer to Signal ProcessingToolbox documentationand with 2mm. and 3mm. wide dielectrics.When the dielectric is wider than 3mm the shift to low frequencies is bigger and is not possibleto retune to high frequencies without losing bandwidth. In this cases, it is impossible tocover all the band.Based on the results, this dielectric walls do not improve the total efficiency of the system.Although with dielectrics lower values of S21 are achieved, also the input impedance matchingSrational multiples of the natural frequency fXO of a crystal oscillator, andcan be generated using a phase locked loop, as shown in Figure 4.2. Detaileddescription of the operation of a PLL does not fall within our agenda (ofdeveloping optimal estimators) in this chapter, but we briefly interpret thePLL as an ML esti