Institute IMTEL

Belgrade, Serbia

Institute IMTEL

Belgrade, Serbia
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Nesic A.,Institute IMTEL | Micic Z.,Institute IMTEL | Radnovic I.,Institute IMTEL | Nesic D.,University of Belgrade
2012 20th Telecommunications Forum, TELFOR 2012 - Proceedings | Year: 2012

Concept of design and realization of high gain printed antenna structures is presented. They consist of antenna array, subreflector, feeding network and bal-un, all printed on the same dielectric substrate. Linear array is positioned on the axis focus of the cylindrical parabolic reflector. Results are presented for the range around 26 GHz with side lobe suppression (SLS) of 30 dB as well as for the range around 60 GHz. An example of design, optimization and realization of the high gain antenna around 23 GHz with cylindrical-parabolic reflector is given in the second part of the paper. In all reported cases agreement between simulated and measured results is very good. © 2012 IEEE.

Nesic A.,Institute IMTEL | Nesic D.,IHTM CMTM
European Microwave Week 2010, EuMW2010: Connecting the World, Conference Proceedings - European Microwave Conference, EuMC 2010 | Year: 2010

Loop radiation elements with circular polarization radiation pattern are investigated. The research includes, also, two-dimensional array with loop elements and feeding network on the same dielectric substrate. Simulation for substrate σ R =1 gives appropriate radiation pattern and axial ratio (AR). Simulation for substrate σ R =2.17 and h= λ g/40 gives large deformations of radiation pattern and AR. The reason is surface waves. The surface waves are suppressed perforating the substrate with holes. Radiation array 8×8=64 is realized in the frequency range around 60 GHz. © 2010 EuMA.

Nesic A.D.,Institute IMTEL | Nesic D.A.,University of Belgrade
IEEE Antennas and Wireless Propagation Letters | Year: 2012

A new type of printed millimeter planar antenna with circular polarization for 60-GHz range is proposed. Radiation elements with two open tape rings are arranged in a two-dimensional 8 × 8 antenna array. Feeding is synphase network with tapered symmetrical (balanced) microstrip in the same plane as the radiation elements. The 8×8 array is fabricated in the conventional technology. To test reproducibility, three samples are fabricated. Measured $S 11 (VSWR), gain, and axial ratio (AR) are very good and in very good agreement between all three samples: AR <3 dB about 25% and gain near 20 dBi. © 2011 IEEE.

Nesic A.,Institute IMTEL | Radnovic I.,Institute IMTEL
Frequenz | Year: 2010

The paper presents concept, simulation, design and realization of the printed antenna array with a subreflector and a cylindrical-parabolic reflector. This antenna is intended for higher millimeter wave ranges and is characterized by many advantages such as efficacy, compactness, broad bandwidth and possibility of integration with other passive and active microwave circuits. Antenna gain is nearly 34 dBi and aperture efficiency is near to 50 %. The antenna operates in the frequency range around 60 GHz. Measured results are in good accordance with those obtained by a simulation.

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