True Path Beam Steering Phase Shifters

The patent replaces conventional electronic phase shifters with a mechanical true time delay system using variable physical path lengths. The phase shifter comprises multiple transmission lines with different physical lengths, where the signal physically travels through different path lengths to achieve precise time delays. This mechanical substitution of path lengths for electronic phase shifting eliminates the need for complex digital phase shifters and switching controllers, reducing device complexity while maintaining or improving beam direction control precision.

The patent introduces a spatial dimension to phase control by using transmission lines with varying physical lengths rather than varying electronic phase shifts. Instead of controlling beam direction through electronic phase modulation in the time domain, the system uses physical path length differences in the spatial domain to create true time delays. This dimensional change from electronic phase shifting to mechanical path length variation resolves the contradiction by providing precise control without increasing circuitry complexity.

The patent replaces electronic switches with a mechanical path selection system. The true time delay phase shifter uses physically distinct transmission line paths with different lengths, where the desired path is selected by switching between pre-defined physical routes rather than using multiple switches within a single path. This reduces the total number of switches required while maintaining precise beam steering capability, as each path provides a fixed, predetermined time delay.

The patent pre-configures multiple transmission lines with different physical lengths before operation. Each transmission line is designed with a specific length to provide a predetermined time delay. During operation, the system simply selects among these pre-configured paths rather than dynamically creating delays through multiple switches. This preliminary preparation of distinct physical paths reduces the complexity and failure risk of the switching mechanism while preserving precise beam steering precision.

The patent replaces electronic phase modulation with mechanical time delay using variable physical path lengths. Instead of using modulo 2π phase shifting that wraps around and causes beam squint at different frequencies, the system uses true time delays achieved by having signals physically travel through transmission lines of different lengths. This mechanical approach to time delay is frequency-independent, eliminating beam squint errors while maintaining implementation simplicity.

The patent changes the fundamental parameter used for beam steering from electronic phase angle (modulo 2π) to physical path length (true time delay). By using transmission lines with different physical lengths, the system creates frequency-independent time delays that do not suffer from the beam squint problem inherent in phase-based systems. This parameter change from phase to time delay resolves the contradiction by providing both implementation simplicity and beam position consistency across wide frequency ranges.