Abstract: This disclosure describes a dielectric filter and a communications device. In one example, the dielectric filter includes at least two dielectric resonators, a first through-hole is disposed between at least one pair of adjacent dielectric resonators, and the first through-hole is configured to cut a magnetic field between the at least one pair of adjacent dielectric resonators. In some implementations, a magnetic field distribution in the dielectric filter may be cut via the first through-hole, so that a magnetic field distribution area is reduced, and a high-order harmonic wave frequency can be increased, thereby improving a remote suppression capability and meeting the specification requirements.

Abstract: An example remote radio apparatus is provided, including a body, a mainboard, a mainboard heat sink, a maintenance cavity, an optical module, and an optical module heat sink. The maintenance cavity and the optical module heat sink are integrally connected, while the optical module is mounted on a bottom surface of the optical module heat sink. The maintenance cavity and the optical module heat sink are mounted on a side surface of the body, and the mainboard heat sink is mounted on and covers the mainboard. The mainboard heat sink and the mainboard are installed on a front surface of the body, and the mainboard heat sink and the optical module heat sink are spaced by a preset distance. The temperature of the optical module is controlled within a range required by a specification.

Abstract: An example remote radio apparatus is provided, including a body, a mainboard, a mainboard heat sink, a maintenance cavity, an optical module, and an optical module heat sink. The maintenance cavity and the optical module heat sink are integrally connected, while the optical module is mounted on a bottom surface of the optical module heat sink. The maintenance cavity and the optical module heat sink are mounted on a side surface of the body, and the mainboard heat sink is mounted on and covers the mainboard. The mainboard heat sink and the mainboard are installed on a front surface of the body, and the mainboard heat sink and the optical module heat sink are spaced by a preset distance. The temperature of the optical module is controlled within a range required by a specification.

Abstract: An example remote radio apparatus is provided, including a body, a mainboard, a mainboard heat sink, a maintenance cavity, an optical module, and an optical module heat sink. The maintenance cavity and the optical module heat sink are integrally connected, while the optical module is mounted on a bottom surface of the optical module heat sink. The maintenance cavity and the optical module heat sink are mounted on a side surface of the body, and the mainboard heat sink is mounted on and covers the mainboard. The mainboard heat sink and the mainboard are installed on a front surface of the body, and the mainboard heat sink and the optical module heat sink are spaced by a preset distance. The temperature of the optical module is controlled within a range required by a specification.

Abstract: An example remote radio apparatus is provided, including a body, a mainboard, a mainboard heat sink, a maintenance cavity, an optical module, and an optical module heat sink. The maintenance cavity and the optical module heat sink are integrally connected, while the optical module is mounted on a bottom surface of the optical module heat sink. The maintenance cavity and the optical module heat sink are mounted on a side surface of the body, and the mainboard heat sink is mounted on and covers the mainboard. The mainboard heat sink and the mainboard are installed on a front surface of the body, and the mainboard heat sink and the optical module heat sink are spaced by a preset distance. The temperature of the optical module is controlled within a range required by a specification.

Abstract: A resonator, a filter, a duplexer, and a multiplexer are disclosed. In an embodiment a resonator includes a resonant cavity casing having a resonant cavity and an open end, a cover covering the open end and being connected to the resonant cavity casing and a resonance tube located inside the resonant cavity. The resonator further includes a tuning rod disposed inside the resonance tube and a dielectric material located in the resonant cavity, wherein the dielectric material is located in a capacitance area formed between a top of the resonance tube and the cover, wherein the tuning rod is rotatable relative to the dielectric material, and wherein surfaces of the tuning rod and the dielectric material face each other and comprise non-circular structures so that an overlapping of the surfaces is changeable to adjust a frequency when the tuning rod is rotated relative to the dielectric material.

Abstract: A resonator, a filter, a duplexer, a multiplexer, and a communications device that use the resonator, where the resonator includes a resonant cavity body that has a resonant cavity and an open end, a cover that covers the open end and that is connected to the resonant cavity body, and a resonant tube that is located inside the resonant cavity, a medium material is padded in a capacitor area in the resonant cavity and whose dielectric constant is greater than 1, the resonant tube includes a resonant tube body and an elastic structure that is combined with the resonant tube body, and the elastic structure provides elastic pressure in an axial direction of the resonant tube where the resonator may reduce a conductor loss and improve a power capacity, and has relatively low costs.

Abstract: A resonator, a filter, a duplexer, a multiplexer, and a communications device that use the resonator, where the resonator includes a resonant cavity body that has a resonant cavity and an open end, a cover that covers the open end and that is connected to the resonant cavity body, and a resonant tube that is located inside the resonant cavity, a medium material is padded in a capacitor area in the resonant cavity and whose dielectric constant is greater than 1, the resonant tube includes a resonant tube body and an elastic structure that is combined with the resonant tube body, and the elastic structure provides elastic pressure in an axial direction of the resonant tube where the resonator may reduce a conductor loss and improve a power capacity, and has relatively low costs.

Abstract: A resonator, a filter, a duplexer, and a multiplexer are disclosed. In an embodiment a resonator includes a resonant cavity casing having a resonant cavity and an open end, a cover covering the open end and being connected to the resonant cavity casing and a resonance tube located inside the resonant cavity. The resonator further includes a tuning rod disposed inside the resonance tube and a dielectric material located in the resonant cavity, wherein the dielectric material is located in a capacitance area formed between a top of the resonance tube and the cover, wherein the tuning rod is rotatable relative to the dielectric material, and wherein surfaces of the tuning rod and the dielectric material face each other and comprise non-circular structures so that an overlapping of the surfaces is changeable to adjust a frequency when the tuning rod is rotated relative to the dielectric material.

Abstract: A single hand keyboard is disclosed. The single hand keyboard comprises on a left side a plurality of keys representing one half of a typing keyboard wherein each key is a pair of characters representing the normal and function keys of a full keyboard layout, one of the characters being normally associated with the key in a typing keyboard and the other character being associated with an opposite key of the other half of the typing keyboard by overlapping and combining the characters for each key. One or more toggle keys are provided for switching between the pair of characters indicated on each key of the keyboard wherein said switching is indicated by one or more LEDs. The right side of the single hand keyboard comprises the standard grouping of special, lock and direction keys including a standard numeric keypad.

Abstract: A polishing fixture includes a body, two fixing members and a pushing member. The body includes two opposite side walls and a main wall connecting the side walls. Each fixing member is slidably mounted on the corresponding side wall along a first direction. The pushing member is slidably mounted on the main wall along a second direction vertical to the first direction. The pushing member includes pushing pillars resisted against the fixing members. The fixing members are separated from the body to be a smain state when the pushing pillars are pressed into the space enclosed by the body and the fixing members.

Abstract: A assembly apparatus for attaching decorative pieces to electronic devices includes a seat, a first cover, a second cover, and a transmitting member. The seat includes a disengaging portion and an attaching portion. The disengaging portion has a recess, a protrusion and at least one positioning column in the recess. The attaching portion defines a receiving room for receiving a shell. The first cover is detachable mounted on the disengaging portion and defines at least one first through hole. The second cover is detachable mounted on the attaching portion and defines a second through hole. The transmitting member includes a latching portion. The latching portion is inserted in the first through hole to attract a decorative piece, and is inserted in the second through hole to release the decorative piece on the shell.

Abstract: A assembly apparatus for attaching decorative pieces to electronic devices includes a seat, a first cover, a second cover, and a transmitting member. The seat includes a disengaging portion and an attaching portion. The disengaging portion has a recess, a protrusion and at least one positioning column in the recess. The attaching portion defines a receiving room for receiving a shell. The first cover is detachable mounted on the disengaging portion and defines at least one first through hole. The second cover is detachable mounted on the attaching portion and defines a second through hole. The transmitting member includes a latching portion. The latching portion is inserted in the first through hole to attract a decorative piece, and is inserted in the second through hole to release the decorative piece on the shell.

Abstract: A backlight module (3) includes a light guide plate (31) having an incident surface (311), and a plurality of light sources (32) disposed opposite to the incident surface. Each of the light sources defines an encapsulation portion (321) to cover and protect core parts of the light source. A filler portion (33) is provided between the light source and the incident surface. A refractive index of the filler portion is the same as refractive indexes of the encapsulation portions and the light guide plate. Therefore a transmission rate of light beams from each light source to the light guide plate approaches or even is 1. Thus the transmission rate of the backlight module is correspondingly high. The arrangement of the filler portion between the light guide plate and the light sources decreases or even eliminates loss of light beams. Therefore the utilization of light beams and the brightness of the backlight module are improved.