A single‐layer substrate integrated waveguide (SIW) monopolar ring‐slot antenna is proposed in this letter. It is based on a combination of a circular ring‐slot etched in the SIW top wall and a set of shorting vias placed concentrically between the area bounded by the ring and the SIW bottom wall. Thanks to this configuration, a monopole‐like radiation pattern is obtained. The antenna is designed for the 5.8 ISM frequency band, parametrically studied and experimentally verified in free space and in the vicinity of a muscle‐equivalent phantom. Experimental results prove that the antenna is very well matched in the 5.8 GHz ISM band, has good radiation performance and small sensitivity to the surrounding environment. © 2014 Wiley Periodicals, Inc. Microwave Opt Technol Lett 56:1865–1869, 2014

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In the paper, we describe a novel H-plane horn antenna for an experimental wireless link operating in frequency bands 71 to 76 GHz and 81 to 86 GHz. The horn antenna was designed considering a substrate integrated waveguide (SIW) technology, The waveguide WR12 was used as a feeder. In order to improve transition between a thin-substrate SIW horn antenna and the air, we combined two approaches; a printed transition and a dielectric load. That way, a better impedance matching and better radiation properties were reached. In comparison with other planar horn antennas, we obtained a more directional radiation pattern with more than 5 dB higher gain and sufficient side lobe suppression in the E-plane. The novel planar H-plane horn antenna was compared with a designed conventional metallic horn antenna.

This paper deals with the investigation of a simultaneous incidence of the thermal noise and the phase noise in a BPSK/SSB communication system, while the receiver filter bandwidth is being decreased. The way of phase noise modeling is shown. A new approach of the evaluation of the behavior of both noise types is established. It gives derivations of noise powers in significant points of the communication system. The system is also modeled in Matlab and simulation results are compared with calculations, while a good agreement is achieved.