Abstract: A filter cover, a resonator, an RF cavity filter comprising the filter cover or the resonator, and a communication device comprising the RF cavity filter are disclosed. A filter cover (2) according to an embodiment comprises, at its inner surface (21), at least one flexible flap (22, 23) for frequency tuning or coupling tuning, which extends from and substantially perpendicular to the inner surface (21). A resonator (3) according to an embodiment is made of a sheet metal, and is integrally formed with a body portion (31), a folded portion (32), and a flexible portion (33, 34, 35) which is connected to the body portion (31) or the folded portion (32) and is bendable with respect to the body portion (31) or the folded portion (32) for frequency tuning or coupling tuning.

Abstract: The present disclosure relates to a cover for a cavity filter, comprising a cover body made of plastic and an inner metal layer applied on an inner side of the cover that is in contact with a cavity of the cavity filter, wherein a capacitance-influencing structure is provided on the inner side of the cover and comprises a recess formed in the cover body and/or a protrusion integrally formed with a base of the cover body and/or a non-metallized area in the inner metal layer. The present disclosure also relates to a cavity filter comprising the above-said cover.

Abstract: A patch antenna structure includes a metal substrate, a feeding patch connected to the metal substrate, and a first feeding line disposed on the feeding patch, a first feeding point and a second feeding line connected in the first feeding line, and a second feeding point connected in the second feeding line, the first feeding line and the second feeding line intersect at a node. A length of the first feeding line between the node and the first feeding point and a length of the second feeding line between the node to the second feeding point are set equal. A switching component for changing the relative phase between the first feeding point and the second feeding point is provided in the first feeding line and/or in the second feeding line.

Abstract: An antenna filter unit and a base station having the antenna filter unit are disclosed. The antenna filter unit according to an embodiment comprises a dielectric body that defines a plurality of single-mode resonators each including a tuning hole. At least one slot is formed on a surface of the dielectric body to serve as an antenna radiator. The at least one slot is coupled to at least one of the resonators.

Abstract: A patch antenna structure is disclosed. The patch antenna structure includes a radome; a metal substrate disposed on one side of the radome and kept at a distance from the radome, a side wall of the radome facing to the metal substrate connecting with a feeding patch, or a side wall of the metal substrate facing to the radome connecting with a feeding patch; an antenna radiating patch attached to a side wall of the radome facing to the metal substrate, wherein the antenna radiating patch is kept at a certain distance from the metal substrate to maintain the radio frequency characteristics of the patch antenna.

Abstract: A dielectric waveguide filter includes first resonant cavities, which are connected to form upper resonant cavities, and second resonant cavities, which are connected to form lower resonant cavities, wherein the upper and lower resonant cavities are correspondingly overlapped; each of the first resonant cavities has a first window coupling structure, wherein the first window coupling structure includes a first window opened at a position where the magnetic field distribution of a high-order mode in each of the first resonant cavities is the weakest, and/or a second window opened at a position where the electric field distribution of the high-order mode in each of the first resonant cavities is the strongest; and each of the second resonant cavities has a second window coupling structure corresponding to the first window coupling structure, and the first and second window coupling structures cooperate to eliminate the high-order modes of the dielectric waveguide filter.

Abstract: A patch antenna structure is disclosed. The patch antenna structure includes a radome; a metal substrate disposed on one side of the radome and kept at a distance from the radome, a side wall of the radome facing to the metal substrate connecting with a feeding patch, or a side wall of the metal substrate facing to the radome connecting with a feeding patch; an antenna radiating patch attached to a side wall of the radome facing to the metal substrate, wherein the antenna radiating patch is kept at a certain distance from the metal substrate to maintain the radio frequency characteristics of the patch antenna.

Abstract: A patch antenna structure includes a metal substrate, a feeding patch connected to the metal substrate, and a first feeding line disposed on the feeding patch, a first feeding point and a second feeding line connected in the first feeding line, and a second feeding point connected in the second feeding line, the first feeding line and the second feeding line intersect at a node. A length of the first feeding line between the node and the first feeding point and a length of the second feeding line between the node to the second feeding point are set equal. A switching component for changing the relative phase between the first feeding point and the second feeding point is provided in the first feeding line and/or in the second feeding line.

Abstract: The disclosure discloses a dielectric waveguide filter, comprising a plurality of first resonant cavities, each two of which are connected to form upper resonant cavities and a plurality of second resonant cavities, each two of which are connected to form lower resonant cavities, wherein the upper resonant cavities and the lower resonant cavities are correspondingly overlapped; each first resonant cavity has a first window coupling structure, wherein the first window coupling structure comprises: at least one of a first window opened at a position where the magnetic field distribution of a high-order mode in the first resonant cavity is the weakest, and a second window opened at a position where the electric field distribution of the high-order mode in the first resonant cavity is the strongest; and each second resonant cavity has a second window coupling structure corresponding to the first window coupling structure.