The paper describes the main phases and features in designing a feeder for a leaky-wave antenna in the Ka-band. The problem of feeding can be effectively solved using a horn antenna SIW technology-based and single substrate-integrated with the radiating aperture of the leaky-wave antenna. Unlike most similar studies, where an aperture exciting from a closed-type structure is analyzed, in our work the open-type antenna feeder is synthesized.In the paper, we give a brief overview of the main achievements in designing traditional SIW-structures and present relations for their calculation. Basing on results of electromagnetic modeling, determine the influence of the substrate permittivity on the efficiency of SIW transmission line by the method of finite Weiland integrals. Consider the most popular types of the waveguide transitions to SIW, including micro-strip lines and grounded coplanar waveguides (GCPW). Depending on the required bandwidth and substrate dimensions specify conditions for selecting a design type of the waveguide transition.A special attention is paid to the non-standard coplanar transition with an elevated grounded surface (EGCPW), which is worth using if the substrates are thick. It was used as a basis for designing a new, more efficient EGCPW transition with the elevated grounded surface, which contains specially made slots (SEGCPW). Recommendations for its adjustment are given.The dependences of the gain on the aperture width for the H-plane SIW horn antenna, which are used to select its optimal size, are obtained basing on simulation. It was found that for matching the feeder with the leaky-wave antenna and decreasing the side lobes level, a dielectric lens with through holes worth using. Basing on the simulation of the unit cell of the lens the dependence of the effective permittivity on the diameter of the through hole is obtained. An influence of the non-uniformity degree of the lens with the holes of different diameters on the radiation efficiency of a horn antenna is determined. The complete design of the synthesized feeder and its radiation pattern is presented to prove the antenna efficiency in the wide frequency band.
Hybrid optical-radio communication systems provide high-speed access within the “last mile” and can act as highly reliable broadband channels of SCADA software and hardware systems. They use optical channels as the main communication lines, and radio channels as backup, since the transmission quality of atmospheric optical channels is largely determined by weather conditions. To reduce the effect of atmospheric turbulence, it is proposed to use the option of spatial diversity with line-of-sight channels and containing a repeater. When the signal-to-noise ratio decreases in the optical channel below the selected threshold, switching to the radio link is to be performed. The paper provides the results of modeling the operation of a hybrid radio-optical line in SCADA systems, in which a new switching system for optical and radio-frequency channels using a repeater is proposed. The dependences of the outage probability of the optical channel and the system as a whole are obtained.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.