Lightweight beamforming networks

Lightweight BFN (beamforming network) implementation based on a hybrid mode technology is described and shown to provide dramatic weight and size reduction relative to waveguide-implemented designs. The hybrid mode technology refers to an integration of microstrip and guided wave media. The basic control element is a ferrite phaser which is significantly reduced in size and weight and which incorporates microstrip input/output circuits. This phaser design, in combination with microstrip circuit components and microstrip transmission line elements, yields a substantial size and weight reduction of the BFN with only a small increase in RF insertion loss. The author provides an overview of this technology, highlighting its features and performance characteristics. Some examples are given