This paper presents a study of various types losses in substrate-integrated waveguides (SIW) using genetic algorithm. Three main are considered and examined separately: conductor loss, dielectric radiation loss. Furthermore, the current analysis allows for physical understanding loss impacts as well creation design guidelines to reduce at 10 GHz frequency while keeping miniaturized size SIW. Va...

Single crystals of the title polyoxometallate-based organic-inorganic hybrid, [Cu(C(12)H(8)N(2))(2)](4)[SiW(12)O(40)], were grown under hydro-thermal conditions. The discrete [SiW(12)O(40)](4-) anions are of the Keggin type and are packed in a slightly distorted ortho-rhom-bic F-centred mode, with the complex [Cu(I)(phen)(2)](+) cations (phen is 1,10-phenanthroline) located in the voids of this...

A Substrate Integrated Waveguide (SIW) planar array is presented using a right handed circularly polarized (RHCP) element with four crossed tilted radiating slots. In addition, a pair of metallic tuning vias is included to really improve the reflection of longest slots. A corporate feeding network over SIW has been designed for distributing the input signal to 128 radiating elements, divided in...

in this paper a new low profile substrate integrated waveguide (siw) probe-fed h-plane horn antenna structure with improved gain is proposed. the proposed antenna consists of two waveguides including a rectangular and a taper one, in which both, first and third modes of the structure are simultaneously excited leading to a uniform field distribution along the radiating aperture of the antenna a...

In this paper, a new configuration of Tapered Slot Antenna (TSA) with improved radiation pattern is proposed and studied. This antenna is designed in the form of a substrate integrated waveguide (SIW) array with respect to side lobe level constraints. For side lobe reduction, a simple quasi-triangular distribution is proposed and is accomplished uniquely by means of 3 dB power dividers. A 12-wa...

Ionothermal synthesis was applied to the formation of polyoxometalates (POMs) and two new compounds [EMIM](8)Na(9)[WFe(9)(micro(3)-O)(3)(micro(2)-OH)(6)O(4)H(2)O(SiW(9)O(34))(3)].7H(2)O (, [EMIM](8)Na(9)[].7H(2)O, EMIM = 1-ethyl-3-methylimidazolium) and [EMIM](4)[SiMo(12)O(40)].12H(2)O (), have been successfully produced in the ionic liquid (IL) [EMIM](4)Br. They were characterized by single-cr...

A wideband and dual-polarized dipole antenna design technique is presented. The proposed employs two sets of elements in orthogonal configuration separated by a dielectric layer. are excited with separate substrate-integrated-coaxial feeds to achieve high port-to-port isolation the overall stackup enclosed substrate-integrated-waveguide (SIW) cavity. To validate fed method, prototype was fabric...

In this paper a new low profile Substrate Integrated Waveguide (SIW) probe-fed H-plane horn antenna structure with improved gain is proposed. The proposed antenna consists of two waveguides including a rectangular and a taper one, in which both, first and third modes of the structure are simultaneously excited leading to a uniform field distribution along the radiating aperture of the antenna a...