US 12,424,747 B2
Multiband resonator element for making filters, polarizers and frequency-selective surfaces
Miguel Alejandro Salas Natera, Madrid (ES); Roberto Garrote Moreno, Madrid (ES); Ramón Martínez Rodríguez-Osorio, Madrid (ES); Francisco Eduardo Carrasco Yepez, Madrid (ES); and José Antonio Encinar Garcinuño, Madrid (ES)
Assigned to UNIVERSIDAD POLITÉCNICA DE MADRID, Madrid (ES)
Appl. No. 17/775,503
Filed by UNIVERSIDAD POLITÉCNICA DE MADRID, Madrid (ES)
PCT Filed Nov. 6, 2020, PCT No. PCT/ES2020/070686
§ 371(c)(1), (2) Date May 9, 2022,
PCT Pub. No. WO2021/089902, PCT Pub. Date May 14, 2021.
Claims priority of application No. ES201930982 (ES), filed on Nov. 8, 2019.
Prior Publication US 2022/0384951 A1, Dec. 1, 2022
Int. Cl. H01Q 5/307 (2015.01); H01Q 9/16 (2006.01); H01Q 15/14 (2006.01)
CPC H01Q 5/307 (2015.01) [H01Q 9/16 (2013.01); H01Q 15/14 (2013.01)] 5 Claims
OG exemplary drawing
 
1. A cavity filter comprising a plurality of resonator elements, wherein each resonator element comprises a plurality of stubs adjusted in frequency and arranged according to a geometric shape to be selected from an ellipse or a rectangle, wherein each resonator element is disposed on a layer of dielectric material and separated from each other by a layer of foam-type material or air, wherein the dielectric materials include a variable dielectric constant to change the working frequency or its phase response, to perform low-pass, high-pass, band-pass or multiband-pass filters.