Slotted antenna arrays used with waveguides are a popular antenna in navigation, radar and other high-frequency systems. A waveguide is a very low loss transmission line. It allows to propagate signals to a number of smaller antennas (slots). Each of these slots allows a little of the energy to radiate. Slot impedance and resonant behavior for a single slot are dependent on slot placement and size. Its exceptional directivity in the elevation plane gives it quite high power gain. The slotted waveguide has achieved most of its success when used in an omnidirectional role To make the unidirectional antenna radiate over the entire 360 degrees of azimuth, a second set of slots are cut in the back face of the waveguide.
A 8×8 planar four pole X band Tchebyshev dual inductive post substrate integrated waveguide filter from 10.15 GHz to 10.7 GHz is designed for terrestrial broadcasting. The filter is designed on the 5870 with a relative dielectric constant of 2.33, loss tangent of 0.0012 and thickness of 0.7874 mm. The diameter of all holes was chosen 1 mm and the distance between side wall holes is 1.5 mm. The width of the SIW is 13.27 mm and the total length of the designed filter is 77.7 mm. This structure is analyzed with FEM solver and Momentum in ADS. Good agreement between results was observed.