Aspects of a method and system for LOGEN based on harmonics using microstrip techniques may include generating an output local oscillator signal from a non-sinusoidal input local oscillator signal by filtering the non-sinusoidal input local oscillator signal via a microstrip filter, wherein the output local oscillator signal may comprise a fundamental frequency that may be given by a harmonic frequency of the non-sinusoidal input local oscillator signal. The microstrip filter may be a programmable bandpass filter or a programmable stopband filter. The microstrip filter may be tuned to the harmonic frequency. The microstrip filter may be configured by adjusting a center frequency via a capacitance and/or an inductance. The bandwidth of the microstrip filter may be configured. The microstrip filter may be a programmable coplanar waveguide filter, and its center frequency may be configured via an inductance and/or a capacitance.