MICROWAVE REPEATER RESEARCH 



209 



The antenna measuring methods which were employed in our repeater 

 research follow along the lines of those described in a recent paper.^^ 

 The very large signal ratios of 120 db or more necessitated double detection 

 receivers and low noise figure crystal converters. Pattern and gain meas- 

 urements of the antennas required measuring sites having large unob- 



Fig. III-8, — A view of the partly assembled lens of Fig. III-7. 



structed areas; these measurements were conveniently taken at the Holmdel 

 Radio Research Laboratory. Impedance measurements involved the usual 

 microwave equipment such as standing wave detectors in waveguide form, 

 signal generators and calibrated receivers. 



Research is now underway on an improved metal lens with gain and band- 

 width properties which are superior to the lens of Fig. III-5. These lenses^^ 



^ C. C. Cutler, A. P. King, W. E. Kock, "Microwave Antenna Measurements", 

 Proc. I. R. E., vol. 35, No. 12, pp. 1462-1471, December 1947. 



21 Winston E. Kock, "Metallic Delay Lenses", B. S. T. J., vol. 27, pp. 58-82, January 

 1948. 



