A two-dimensional quasi-optical power combining oscillator array with external injection locking

Publikationstyp
Journal Article
Date Issued
2004-02-19
Sprache
English
Author(s)
Magath, Thore  
Höft, Michael  
Judaschke, Rolf  
Institut
Hochfrequenztechnik E-3  
TORE-URI
http://hdl.handle.net/11420/11313
Journal
IEEE transactions on microwave theory and techniques  
Volume
52
Issue
2
Start Page
567
End Page
572
Citation
IEEE Transactions on Microwave Theory and Techniques 52 (2): 567-572 (2004-02-01)
Publisher DOI
10.1109/TMTT.2003.821932
Scopus ID
2-s2.0-10744222030
A quasi-optical power combiner for a 4 × 4 IMPATT oscillator array has been designed and experimentally investigated. The combiner consists of a bi-periodic dielectric phase grating which transforms the near field of a rectangular horn array into a pseudoplane wave. The horn array is excited by oscillators which operate uniformly in both amplitude and phase. A parabolic mirror with a superimposed surface relief couples the pseudoplane wave into a rectangular output horn antenna. In principle, the combiner has no restriction in inter-element spacing and is hence scalable up to submillimeter wavelengths without degradation of power combining efficiency. The quasi-optical design has been verified by scalar field measurements in several planes. The oscillator matrix is injection-locked by a master oscillator from the output port. A continuous wave output power of 1.3 W with an overall power combining efficiency of 70% has been measured at 65 GHz.
Subjects
Holography
Oscillator array
Phase grating
Quasi-optics
Spatial power combining
DDC Class
600: Technik