oscillator.pdf

DESIGN AND FABRICATION OF LOW COST MICROWAVE OSCILLATOR
S. Khadanga and S. Ahmad
Millimeter Wave Devices Laboratory
Central Electronics Engineering Research Institute
Pilani - 333031, India
Abstract:- A low cost microwave oscillator is fabricated using a RF transistor having a half wave length
coaxial line as feedback element. The output impedance is matched with lossless microstrip line and the output
is taken across 50 Ω load followed by a dc block capacitor. The oscillator is designed by measuring S-parameter
of the transistor using a fabricated test fixture and VNA. Software is developed to determine circuit
components and dimension of microstrip line, taking transistor S parameter, substrate parameter and operating
point as input data. The mask required for the etching the circuit is prepared by using photoplotter. The circuit
is fabricated on a low cost double sided copper clad epoxy glass PCB substrate. The power output is about 10
mw at 1.6GHz and band width of 70MHz from NEC transistor.

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