Phase Displacement Space Drive

The Phase Displacement Space Drive is an innovative method of propulsion proposed in 2011 by Moacir L. Ferreira Jr., which uses two emitter antennas, phased 0° and 90°, and quarter-wave spaced (nλ+ λ/4), producing attraction force, mediated by Em waves, between space and antenna at one extremity, and repulsion force at another extremity, causing net thrust force toward one direction. It was designed to overcome inherent limits of current expelling-mass propulsion systems in order to enable fast space travel in a more energy-efficient way, without infringing the laws of classical physics.
Theory of operation
Even though electromagnetic waves have no mass, they still carry momentum in the direction of movement.
The Phase Displacement Space Drive is comprised by two transmitter antennas (A and B, left and right), spaced quarter wavelength apart (nλ+ λ/4), each emitting respectively 0° and 90° . Starting from A, wave will face B with same-polarity (in-phase 0°), always repulsion force. On the other hand, starting from B, wave will face A with opposite-polarity (contra-phase 180°), always attraction force. Hence, the set of antennas will be displaced from left to right. will occur between the antennas and phase-shifted waves, and transversely between phase-shifted waves and the surrounding medium.
Performance
Directional antennas can be used to concentrate radiation to form a beam in one specific direction. Hence, if using directional antennas, horn antennas, or parabolic antennas, facing each other, the energy-efficiency can go beyond 90%. Not taking into account losses due to electromagnetic radiation, maximum performance it will be no more than 50W/kg(50 kW/tonne) @ 1 g-force(10 m/s²). Comparatively, even with heavy EM losses, it will be far more energy-efficient than any expelling-mass propulsion system which payload mass is 1% to 10% of the propellant mass.

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