Persons

In designing the receiving-transmitting active phased antenna array (APAA) an important problem is an achievement of the level of maximum outcome between the receiving and transmitting channels. In the work, the concept of building multi-beam receiving-transmitting antenna systems based on APAA has been considered. The criteria for selecting the type of emitter for an S-band antenna with the specified parameters have been presented. It has been shown that the use of a turnstile emitter based on the printing technology can reduce the complexity of manufacturing without compromising the technical parameters. In accordance with the requirements for volume of the tasks of APAA being designed the optimal geometric and electric characteristics of the turnstile radiator have been calculated. In designing the radiating apertures of the multielement APAA the specifics of the dependence of their electric characteristics on the inter-element distance has been taken into consideration. To increase the circular polarization coefficient of the apertures being designed, the method of tearing apart of the radiator with further compensation of the obtained phase using the phase rotators APAA has been implemented. The estimates of the energy characteristics of the multi-element antennas with a given scanning sector for various inter-element distances have been given. To ensure the separation of the receiving and transmitting antennas the recommendations have been presented.

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In modern satellite communication systems, the side repeaters, using an active phased array antenna receiving and transmitting modules, include, as a rule, the discrete phase shifters. The latter are designed in the form of the hybrid integral circuits or monolithic circuits. In this study the open-frame module of analog-to-digital shifter with phase 0-360° change on domestic controlling SHF MIS varicaps, allowing to maintain the setting phase accuracy not more than 0.5, has been considered. An original scheme of the analog-to-digital phase shifter with the phase change of 0-360° L -range, using the Lange coupler and the phase sifting cells on four microwave MIS varicaps has been proposed. The requirements for the form of the volt-farad feature and the ratio of the overlap capacitance of MIS varicap have been defined. It has been shown that the proposed scheme of the analog phase shifter permits even at the maximum (critical) frequency of SHF MIS varicaps no more than 15 GHz to ensure the loss of the phase shifter in L -range no more than 1.5 dB. Operating of analog-to-digital phase shifter with the phase 0-360° change has been realized by the board digital control. The 8 digit analog converter has been used. The bit width of the discrete control of the phase shifter is 1.4 degree with 256 quantities of the analog converter states. The obtained characteristics of the precision analog-to-digital phase shifter permit to make a conclusion about the prospects of implementing it for solving the issues of synchronization of the active radio target simulator for synthesizing the aperture radars testing and, also, in the composition of receiving and transmitting modules of the few elemental active phased array antennas for L -range.

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The options of constructing the multipath receiving antenna systems based on APAA have been considered. The criteria for the selection of emitters for antennas of different range and purpose have been presented. It has been shown that the use of the phase shifters based on arsenide-gallium FET in the passive inclusion can reduce the consumption of control circuits without deterioration of the technical parameters. The estimates of the energy characteristics of three types of APAA have been given. The recommendations on the electromagnetic compatibility have been presented.

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The issues of application of dielectric resonators in the reception modules for work in the complicated electromagnetic conditions have been considered. The design of the bandpass filters based on the dielectric resonators has been described. The results of the experimental studies have been presented.

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