The spatial separation of signals by the curvature of the wave front

Abstract

In this paper, a new method of spatial separation of several signals with different curvatures of the wave front is proposed. The method is based on the formation of a particular interference field structure of each signal in the location of the receiving antennas by means of a transmitting phased sparse linear array antenna. The peculiarity of the interference electromagnetic field consists in periodically repeating areas in which the amplitude of the useful signal is many times greater than the amplitudes of the other transmitted signals, which are electromagnetic interference. In addition, the electromagnetic interference signal in this area consists of practically two antiphase components. If in this area a reflective passive phased antenna array is placed, which will focus the useful signal while reflecting, it will be increased, and the interference signal will be significantly weakened. This method of signal separation allows simultaneous transmission of several signals in the same frequency band, in one direction and on one polarization, which increases the information transmission speed in communication systems.

Influence of the radio signals frequency band on their spatial selection in communication channels

“…As follows from ( 10), taking into account ( 5), the coordinates of the zeros of the full field amplitude depend on the time, frequency deviation, and duration of the LFM pulse. Under the condition Δf = 0, the expression (10) turns into a similar expression for the zeros of the narrow-band signal amplitude, obtained in [3]. Fig.…”

“…Earlier in works [3,4,11] to increase the speed of information transmission and efficient use of the frequency resource was proposed and investigated communication system with spatial separation of signals for the transmission of narrowband signals.…”

“…In [3], a method for spatial separation of narrow-band signals transmitted in the same direction and at the same carrier frequency = 15 GHz was proposed. The essence of the method is that in the area of the receiving antennas for each signal, a unique interference field structure is formed.…”

“…The interference structure of the field of each signal is formed by adding the radiation fields of coherent copies of the signal from the aperture emitters being part of the linear sparse antenna array (SAA).The difference in the interference structures of the fields of different signals was achieved by introducing an individual relative phase shift for each signal between its copies at the inputs of the transmitting antennas. This formation of the radiation fields of different signals allows transmitting on the same carrier frequency with subsequent selection at the reception of up to N different signals, where N is the number of emitters in the transmitting SAA [3].…”