Abstract: The invention provides a bandpass filter, comprising: a substrate with a plurality of dielectric layers; a plurality of resonators; and a plurality of ground layers each having one slot arranged on; wherein the plurality of resonators are arrayed vertically each on respective one of the plurality of dielectric layers alternately without any of offsets, and each of the plurality of ground layers is between adjacent dielectric layers. Adjacent slots are arranged in opposite sides of the ground layers. The invention also provides a method of fabricating the bandpass filter.

Abstract: The embodiments herein relate to a method in a base station for transmitting an UpLink Transmit Power Control, UL TPC, command to a user equipment in a communications network. The base station obtains a measurement of a distortion of a signal received from the user equipment. The signal is associated with a power to be controlled. The base station determines that the signal is unreliable if the distortion measurement is above a threshold or determining that the signal is reliable if the distortion measurement is below the threshold. The base station transmits a first UL TPC command to the user equipment when the signal is determined to be unreliable or transmits a second TPC command to the user equipment when the signal is determined to be reliable.