Abstract-In this work, we present a novel DC-bias network for multiharmonic microwave circuits based on an arbitrarily width-modulated microstrip line. The arbitrary shape of the width-modulated microstrip line is obtained by using multiple microstrip taper sections. The method is illustrated through the design of four different DC-bias networks blocking from 1 to 4 harmonic components of a 2.5 GHz signal. The designs with an optimum shape for the arbitrarily widthmodulated microstrip line have been manufactured and measured, obtaining a good agreement between the simulated and measured behavior.

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Abstract-In this work a non-linear efficiency optimization method for its application to an Injection-Locked High Efficiency Voltage Controlled Oscillator is presented. The proposed approach is based on the control of the harmonic content of the oscillator autonomous signal, which is accomplished through the use of an Auxiliary Generator and several multi-harmonic loads based on Arbitrarily Width-Modulated Microstrip Lines. The presented technique has been applied to the design of a 2.5 GHz high efficiency Voltage Controlled Oscillator, which has been manufactured and experimentally characterized, obtaining a good agreement between the simulated and measured results.

In this work a non-linear efficiency optimization method for its application to a high efficiency Voltage Controlled Oscillator is presented. The technique is founded on the use of an auxiliary generator and several multi-harmonic loads based on Arbitrarily Width-Modulated Microstrip Lines to ensure the convergence of the optimization process. A 2.5 GHz high efficiency VCO has been designed and synchronized with an external signal. Then, a detailed analysis of the efficiency of all the possible synchronized solutions of the injection locked VCO is presented. Finally, to validate the technique, a prototype has been implemented and experimentally characterized, obtaining a good agreement between the simulated and measured results.