Quasioptical power combining using mutually synchronized oscillator arrays
Abstract
A quasioptical method for solidstate power combining with applications to highpower millimeterwave generation is discussed. The approach uses twodimensional planar arrays of weakly coupled oscillators. Limiting the strength of the coupling avoids multifrequency moding problems and simplifies the design. A radiating element is embedded in each oscillator so that the power combining is accomplished in free space. The concept which has been demonstrated with two prototype arrays, one using Gunn diodes and the other using MESFETs is discussed. A theoretical description of the coupledoscillator arrays is presented for design purposes, and is used to investigate phasing problems and stability. Experiments are discussed which indicate that inphase operation is facilitated by using a quasioptical reflector element, which influences the operating frequency and coupling between the elements. Equivalent isotropic radiated powers of 22 W at 1 percent efficiency for a 16element Gunn array and 10 W at 26 percent efficiency for a 16element MESFET array which have been obtained at X band are discussed.
 Publication:

IEEE Transactions on Microwave Theory Techniques
 Pub Date:
 June 1991
 DOI:
 10.1109/22.81670
 Bibcode:
 1991ITMTT..39.1000Y
 Keywords:

 Antenna Radiation Patterns;
 Microwave Antennas;
 Microwave Coupling;
 Microwave Oscillators;
 Millimeter Waves;
 Solid State Devices;
 Antenna Arrays;
 Field Effect Transistors;
 Electronics and Electrical Engineering