# Accession Number:

## ADA137240

# Title:

## Design of Microwave Beam-Switching Networks.

# Descriptive Note:

## Technical rept.,

# Corporate Author:

## MASSACHUSETTS INST OF TECH LEXINGTON LINCOLN LAB

# Personal Author(s):

# Report Date:

## 1983-12-05

# Pagination or Media Count:

## 81.0

# Abstract:

An investigation of RF beam-switching networks for creating, with a multiple-beam antenna MBA, a set of electronically steerable antenna beams, shows that there are three main classes of network. Taking the case of a 61-beam MBA with 8 simultaneously steered beams as an example, we can describe these classes as a networks which can connect any one of the 8 output ports to any one of the 61 beam feeds, b networks which can connect the 8 output ports to any set of 8 beam feeds selected from the 61, but with a constraint imposed on the order in which the 8 ports are connected to the 8 selected feeds, and c networks in which the set of 8 beam feeds cannot be selected arbitrarily - some fraction of the total number of conceivable interconnections cannot be completed. Networks exist in each of the three classes having very similar traffic handling performance and yet requiring a total number of switches which is very different from one class to the next. Their number is 907, 387, and 175 for the unconstrained, order-constrained and selection-constrained networks, respectively, needed to do the 61-to-8 switching job described above. The report examines the design, performance and complexity of such networks for general N and M. Included are two further measures of complexity, as well as the switching algorithm and the effect of non-uniform traffic. The results are presented as graphs, tables and formulas. Author

# Descriptors:

# Subject Categories:

- Non-Radio Communications