An odd order MESFET frequency multiplier which outputs a desired odd harmonic of a fundamental tone. The frequency multiplier (100) includes a multiplier stage with a MESFET (16) having a harmonic response dependent upon a plurality of bias conditions (24, 26) and the input power level (28). The MESFET (16) includes a drain port (32) coupled to an output matching network (30) sized and configured for a predetermined load (27) at a selected output frequency. The output matching network (30) includes RF shorts (40, 42) for reflecting energy to the MESFET (16) from a plurality of undesired even harmonics. Coupled to the output matching circuit (30) is a bandpass filter (36) sized and configured for the predetermined load (27). The bandpass filter (36) includes RF shorts for reflecting energy to the MESFET (16) from a plurality of undesired odd harmonics, wherein the reflected energy from the undesired even harmonics and the undesired odd harmonics are combined at the MESFET (16) to provide additional energy at the desired odd harmonic.