Showing papers on "Ka band published in 1975"

Gunn-Effect Amplifiers for Microwave Communication Systems in X, Ku, and Ka Bands

Abstract: This paper describes the design and performance of small-signal stable multistage Gunn-effect reflection-type amplifiers for communication systems in X, Ku, and Ka bands. A single-stage design approach is developed, based on measured small-signal Z parameters of the Gunn diodes. This technique is then applied to a microstrip medium at lower frequencies (X and Ku bands) and to a coax/waveguide hybrid structure at Ku band. Performance of a two-stage amplifier is described in the bands 11.7 to 12.2 GHz and 14.0 to 14.5 GHz. In high Ka band, performance of both a two- and a four-stage amplifier is presented.

A Low Noise Broadband Ka-Band Waveguide Mixer

Abstract: A Ka-band waveguide double-balanced mixer is described which has low noise and broadband performance. A double sideband noise figure of 5.9 dB was achieved. The mixer is capable of operation over a frequency range from 26 to 40 GHz. A unique mixer configuration for achieving double-balanced mixer operation is described. The new mixer configuration simplifies the problems encountered in fabricating a double-balanced waveguide mixer at Ka-band.

Electronically-Tunable, Low Noise Ka-Band Paramp-Downconverter Satellite Communications Receiver

Abstract: The Ka-band-to-UHF parametric amplifier-downconverter satellite communications receiver described herein provides less than 4dB SSB noise figure over either electronically selectable sideband of the externally supplied ~37.5 GHz local oscillator, each of which is downconverted to a fixed 500-650 MHz IF output band. To achieve such widely tunable low noise performance, this receiver utilizes state-of-the-art varactors, a unique, solid-state pumped Ka-band paramp design and a low noise balanced mixer-transistor IF amplifier, incorporated with associated power supply and thermal stabilization in a self-contained 6" x 5" x 4" package.

Full-band staggered-gain Gunn-effect amplification in Ka band

Abstract: The feasibility of full-band low-noise instantaneous amplification in Ka band has been demonstrated using a staggered-gain amplifier technique. A simplified analysis of the overall gain variations in this two-stage amplifier is used to calculate the minimum isolation levels needed to meet a maximum allowable ripple. Using this technique, 10 ± 2.2-dB gain has been obtained from 26.6-39.4 GHz.

A 5W Ka-band TWT for space communications

Abstract: The authors describe the particular development of a low-power (5 watts at ~36 GHz) helix travelling-wave tube (TWT) for satellite use. In this respect, the TWT design was configured for typical space communication specifications such as low distortion characteristics, maximum efficiency, and high reliability. The main thrust of this paper, however, is related to the technological aspects which have made possible the fabrication and performanocfe this Ka-band TWT

K-Band Image-Reject and Ka-Band Balanced Mixers Constructed Using Planar Millimeter-Wave Techniques

Abstract: : An image-reject mixer for Ka-band (18.0 to 26.5 GHz) and a balanced mixer for K-band (26.5 to 40.0 GHz) have been developed using planar microwave integrated-circuit techniques. These mixers have low-noise performance over the entire waveguide bands and successfully demonstrate the first wideband applications of planar MIC techniques at millimeter wavelengths. Further, they established the feasibility of the MIC approach up to 40 GHz and pave the way for similar developments to 80 GHz and beyond. The designs, fabrication, and performance of the K-band image-reject mixer and the Ka-band balanced mixer are presented and discussed.