An Analysis of Simplified Feed Architectures for MMIC (Monolithic Microwave Integrated Circuit) T/R (Transmit/Receive Module Arrays,
Abstract
MMIC T/R modules offer the possibility for simplifying the feed networks of active aperture phased arrays. In particular, the addition of amplitude control along with the existing phase control would allow the same feed network to be used in the transmit and receive modes even though the two require grossly different aperture tapers. This is easily accomplished by using the amplitude control in the modules to provide the weighting required to produce low sidelobe receive beams. Specific examples in which amplitude control is implemented with digital attenuators are examined. The effect of the attenuators on the array output signal-to-noise ratio and the error sidelobe level due to the amplitude quantization are evaluated. The results indicate that the component values needed - total attenuation 20 to 30 dB, low noise amplifier gains and noise figures 20 to 30 dB and 3 to 4 dB respectively, and quantization of 2 to 6 bits - are readily achievable in current GaAs technology. With these, active aperture monopulse arrays with sidelobe levels of -20 to -50 dB below the peak of the mainbeam may be designed with greatly simplified feed networks. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Feb 01, 1987
- Accession Number
- ADA185474
Entities
People
- J. Leon Poirier
Organizations
- Rome Laboratory