COT'PLKD AVAVK TTIKOHY AXD AVAVKfU-IDE APPUrATK )XS 710 



The experimental data given for two dominant-mode rectangular 

 waveguides showed that the periodic energy exchange theoretically pre- 

 dicted for a t'oupled-wave system can he achieved in coui)led transmis- 

 sion lines. 



Performance characteristics were given for some loosely coupled trans- 

 ducers between a dominant-mode rectangular waveguide and one mode 

 of a six-mode waveguide. A tapered coupling distribution wuh used to 

 achie^•e the mode selectivity in a limited length interval. 



The problems associated with a coupled-wave transducer for ti'ans- 

 ferring all of the power from a dominant-mode rectangular waveguide 

 to the circular electric mode in a ten mode waveguide, were discussed 

 and the obserx'ed characteristics of an experimental model were gi^•en. 



The application of coupled-wave techniques to other types of trans- 

 mission systems was illustrated by pointing out analogous structures 

 using coupled dielectric waveguides. 



ACKXOWLEDGMEXT 



The writer is indebted to W. W. Mumford for helpful discussions 

 during the early stages of this work; to R. W. Dawson who made most 

 of the measurements on the models of Figs. 36 through 44, and to (I. 

 D. Mandeville who made measurements on the model of Fig. 39. 



BIBLIOGRAPHY 



1. S. E. Miller and A. C. Beck, Low-Loss Waveguide Transmission, Proc. I R E 



41, pp. 348-358, Mar., 1953. 



2. S. E. Miller, Notes on Methods of Transmitting the Circular Electric Wave 



Around Bends, Proc. I.H.E., 40, pp. 1104-1113, Sept., 1952. 



3. W. W. Mumford, Directional Coujjlers, Proc. LR.E., 35, pp. 160-165, Feb , 



1947. 



4. C. L. Dolph, A Current Distril)Ution for Broadside Arrays Which Optimizes 



the Relation Between Beam Width and Side Lobe Level, Proc. LR E 34, 

 pp. 335 348, June 1946. 



5. S. E. Miller and W. W. ]\Iumford, Multi-Element Directional Couplers, Proc 



I.R.E., 40, PI). 1071-1078, Sept., 1952. 



6. H. J. Riblet and T. S. Saad, A Xew Type of Waveguide Directional Coupler, 



Proc. LR.E., 36, i)p. 61-64, Jan., 1948. 



7. ^L Arnoff, Radial Probe Measurements of Mode Conversion in Large Round 



Waveguide with TEoi Excitation, (submitted to Proc. I.R.E.). 



8. A. G. Fox, Xew Guided Wave Techniques for the Millimeter Wavelength 



Range, given orally at the March, 1952, LR.E. National Convention. To be 

 sulmiitted to the Proceedings. 



9. Alan A. MeverhofT, Literaction Between Surface-Wave Transmission Lines, 



Proc. LR.E., 40, pp. 1061 1064, Sept., 19.52. 



10. P. E. Krasnushkin and U. \' . Khokhlov, S])atial lieating in Coupled Wave- 



guides Zh. Tekh. Fiz, 19, pp. 931-942, Aug., 1949, (in Russian). 



11. W. J. .\lbersheim, Propagation of TEm Waves in Curved Wave Guides, 



B.S.T.J., 27, pp. 1-32, Jan., 1949. 



