Accession Number : AD0478828


Title :   A STUDY OF ELECTRONICALLY TUNABLE MICROWAVE (X-BAND) GENERATORS.


Descriptive Note : Technical rept.,


Corporate Author : RADIO CORP OF AMERICA NEW YORK DEFENSE ELECTRONIC PRODUCTS


Personal Author(s) : Bossard, B B ; Ernst, R L ; Torrione, P S


Report Date : Feb 1966


Pagination or Media Count : 70


Abstract : A direct times 10 multiplier with an output frequency of 10 Gc was constructed using a hyper-abrupt varactor diode. Over-all efficiency of the multiplier is limited to approximately 1% by the low cutoff frequency of the diode. Varactors which should have cutoff frequencies four to five times greater than the one used in the experiment are presently being fabricated by RCA. These diodes should be capable of efficiencies approaching 25%. Another times 10 multiplier using a step recovery diode has generated 35 milliwatts at X-Band. Over-all efficiency of this device is found to vary as 6.7% in a times 8 multiplier, 6.2% in a times 10, and 3.3% in a times 12. These multipliers are presently being modified to incorporate two to four step recovery diodes so that the required over-all power output of 100 milliwatts can be achieved. A bimode varactor tripler has demonstrated an over-all efficiency of 33% at an output frequency of 9.9 Gc; an output of 230 milliwatts is generated at X-Band. Times 4 and times 5 bimode multipliers are presently being designed. A half-watt fundamental transistor oscillator which is mechanically tunable from 970 to 1040 mc has been completed. In addition, an electronically tunable fundamental oscillator which provides 200 to 400 milliwatts tunable from 990 to 1035 mc has been developed. Transistor oscillator multipliers which generate 1 1/2 watts at 1.25 Gc and provide a 10% electronic tuning capability are under development. (Author)


Descriptors :   *VARACTOR DIODES , *X BAND , *FREQUENCY MULTIPLIERS , *TRANSISTOR AMPLIFIERS , BANDPASS FILTERS , RADIOFREQUENCY POWER , ULTRAHIGH FREQUENCY , NOISE(RADIO) , AMPLITUDE MODULATION , PHASE MODULATION , PARAMETRIC AMPLIFIERS


Subject Categories : Electrical and Electronic Equipment


Distribution Statement : APPROVED FOR PUBLIC RELEASE