Synthesis of Phase-Correcting Elements Based on Band-Pass Filter and Their Application in Transmitarray Antenna

Introduction. This paper presents a procedure for synthesis of phase-correcting elements (PCE) based on band-pass filter using specialized software developed for these purposes. The amplitude response of the synthesized PCE and LC-filters based on lumped elements is compared. The obtained structures can be applied in deflecting and focusing transmitarrays and in low-profile scanning antenna systems of ground terminals of satellite communication systems, which is particularly significant for the advancement of satellite communications used by medium- and low-orbit spacecrafts.
Aim. Software development for PCE synthesis based on band-pass filters (BPF) for application in deflecting and focusing transmitarrays.
Materials and methods. The filter characteristics were calculated using the MATLAB, Filter Solutions, and AWR DE software applications. Characteristics of the synthesized PCE were obtained by electrodynamic modeling using the finite element and finite integration methods.
Results. BPF were calculated in different software applications according to the given characteristics: center frequency – 10 GHz; bandwidth – 40%; and irregularity in the bandwidth – 0.1 dB. A software environment for synthesis of PCE was developed based on Chebyshev filters of type 1 of even and odd orders from 3 to 9. A satisfactory match between the characteristics of the coupled resonator filter and PCE was obtained. The deflecting and focusing structures were synthesized, and their electrodynamic modeling was carried out. The slope angle of the radiation pattern of the deflecting structure was 20º. The reflection coefficient of the focusing structure ranged within 10.7…12.7 GHz, not exceeding –15 dB. The directivity coefficient varied from 25.8 to 28 dB.
Conclusion. The synthesized deflecting and focusing structures can be used both independently and as control layers in low-profile scanning antenna systems. The developed software provides a significant reduction in the time required for the calculation and synthesis of a large number of PCE.

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