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Magneto Electric (ME) dipoles have been widely studied over the last few years. They are becoming increasingly popular as they allow to generate a wide bandwidth in a printed circuit board (PCB). Nevertheless, their principle of operation requires the use of relatively thick substrates (i.e. about 0. 25λ 0 , where λ 0 is the free-space wavelength) thus resulting in a bulky stack-up. This work tackles this problem by proposing a new type of low -profile ME dipole. The proposed configuration is fed using a slot-coupled microstrip line feed and it employs bandwidth enhancement solutions previously used in metal-only structures. As a result, an ultrathin antenna is achieved which operates over a 20% bandwidth at Ka-band while using an ultrathin dielectric layer being the antenna thickness equal to 0.082 λ 0 . Moreover, the antenna has a gain of about 5.5 dBi across the entire bandwidth, which makes the proposed design suitable for next generation 5G base stations.

this work proposes a novel design of two-layered antenna array targeting the D-Band region of the spectrum, likely to become the next commercial battleground for millimeter-wave communications. The design is basically an 8 × 8 hollow metallic cavity backed antenna array which exhibits a thin planar footprint with volume of $( 30.1 \times 26.4 \times 1.2$ mm3) and it is capable of covering the 153-161 GHz, which corresponds to 5.2% of FBW. Radiation characteristics are investigated for both 2 × 2 subarray and the whole 8 × 8 antenna where the obtained peak gain values are 12.4 dBi and 22.4 dBi, respectively. The achieved HPBW is 3.5° whereas grating lobes appears at 29°. These values are in-line with the requirements of next-generation point to point communications where short links are foreseen. Index Terms— Antenna array, backhauling communications, D-Band, millmeter-wave, metlic waveguide, slotted antenna.

A broadband and broad-angle linear-to-circular polarization converter based on a dual-layer substrate is presented. The elementary cell of the proposed converter is composed by a Jerusalem Cross (JC). The design procedure is based on transmission line circuit theory and on full-wave unit cell analysis in frequency domain. Simulated results demonstrate a 24% axial ratio bandwidth for an incidence angle θ = ± 50° in both x-z and y-z planes. The proposed converter provides a unique combination of wide bandwidth, thin profile, and stable response with respect to the angle of incidence. It can be integrated to any linearly polarized antenna to generate circular polarization without affecting the antenna performances.