Resumen
Multi-band resonator element, which on the one hand compensates the components of an electromagnetic field radiated from its phase center located on the axis of symmetry of the resonator to control the polarity purity of a radiating element. On the other hand, it allows selecting the electromagnetic fields reflected and transmitted on a selective surface in frequency and multi-band. In this sense, it is an innovative element that allows the design of directive radiating elements with an axial relationship for circular polarization of less than or equal to 1.5 dB for all angles belonging to the hemisphere centered on "broadside". Likewise, this can be used in the design of reflectarrays, transmitarrays and any multi-band dichroic surface, as well as in metamaterial surfaces. (Machine-translation by Google Translate, not legally binding)
Reivindicaciones
1. Multiband resonator element characterized in that it comprises a plurality of stubs (13.a, 13.b) adjusted in frequency and arranged according to a geometric shape to be selected from an ellipse or a rectangle. 2. A resonator element according to claim 1, wherein the ellipse has an aspect ratio equal to the unit and the stubs are arranged radially between inner rings (12.a) and outer rings (11.a), thereby forming a ring of stubs (13.a). 3. Resonator element according to claim 1, wherein the rectangle has an aspect ratio equal to the unit and the stubs are arranged linearly on the four sides of the rectangle, with inner rings (12.b) and outer rings (11.b), thus forming a rectangle of stubs (13.b). 4. Resonator element according to any of the preceding claims, comprising a discontinuous slot (92.a, 92.b) arranged on a base structure (91.a, 91.b), wherein the slot has a shape dependent on the selected geometric shape and the frequency adjusted stubs. 5. Resonator element according to any one of the preceding claims, wherein said resonator element comprises a metal material. 6. A cavity filter comprising a plurality of resonator elements (23.a, 23.d, 23.g, 23.k) according to any one of the preceding claims, wherein each resonator element is disposed on a layer of dielectric material (23.b, 23.e, 23h, 23j) and separated from each other by a layer of foam-type material (23.c, 23.f, 23.1) or air. 7. A cavity filter according to claim 6, wherein the dielectric materials have variable dielectric constant to change the working frequency or its phase response, to perform low-pass, high-pass, band-pass or multiband-pass filters. 8. A radiant element formed by the filter cavity according to claim 7, for single or multiband applications. 9. A radiating element comprising a resonator element according to claim 2, wherein the stubs comprise a length, a width, a track spacing and a ring radius, configured to optimize the axial ratio with respect to the axis of symmetry thereof. 10. A dichroic subreflector comprising a first resonator element according to claim 2, wherein the stubs comprise: a length configured to adjust a central band; a track spacing configured to adjust the central band and an upper band; and a ring radius configured to adjust a lower band and the upper band. 11. A dichroic subreflector according to claim 10, further comprising a second resonator element (42.e) identical to the first resonator element and arranged at an effective half-wavelength distance from the first resonator element that is dependent on the impedances and operating frequencies, resulting in a symmetrical configuration. 12. A dichroic subreflector according to claim 10, further comprising a smooth resonator ring (52.f) disposed at an effective distance different from half a wavelength of the first resonator element that is dependent on the impedances and frequencies of operation, resulting in an asymmetric configuration. 13. A radiating element comprising a resonator element according to any one of claims 1-5, wherein the radiating element further comprises an aperture polarizer configured to improve the axial ratio of the circular polarization of the radiating element up to angles of 90 degrees from a broadside axis. 14. A reflectarray antenna formed by a plurality of periodic cells (30) each comprising a resonator element according to any of claims 1-5. 15. Frequency-selective surface for one or multiple bands formed by a plurality of periodic cells each comprising a resonator element according to any one of claims 1-5, wherein the frequency-selective surface further comprises a dielectric material with a variable dielectric constant. 16. Device according to any one of the preceding claims which further comprises an adjustable dipole to favour a polarization or application.
