Abstract: A method for determining a communication path of millimeter wave signal and measurement device using the method includes a first measuring device and a second measuring device. The first measurement device queries a list to determine a first AOD of the first measurement device corresponding to a LOS, and controls the array antenna of the first measurement device to send the millimeter wave signal at the first AOD of the first measurement device corresponding to the LOS to the second measurement device. The second measurement device queries the list to determine a first AOA of the second measurement device corresponding to the LOS, and controls the array antenna of the second measurement device to receive the millimeter wave signal at the first AOA of the first measurement device corresponding to the LOS. Thus, a downlink between the first measurement device and the second measurement device can be quickly established.

Abstract: A measurement method for measuring millimeter wave (mm-wave) signal and device using the method includes a first measuring device receiving a mm-wave signal by an array antenna at a first angle of arrival corresponding to a position of the first measuring device, the mm-wave signal being sent by a second measuring device at a first angle of departure. Thereby, a downlink between the first measuring device and the second measuring device can be established quickly. From a certain ascertainable location, the first measurement device sends the mm-wave signal by the array antenna at a second angle of departure, and the second measurement device receives the mm-wave signal at a second angle of arrival corresponding to the position of the first measuring device, thus, an uplink between the first measuring device and the second measuring device can be established quickly.

Abstract: An antenna structure includes a first array antenna having a number of first antenna units. The antenna units are arranged along a first direction and a second direction. The first antenna units are monopole antennas. The monopole antennas include a radiating body having a strip portion and a bulb portion. The radiating body generates radiation along the first direction or the second direction. The strip portion is electrically coupled to a signal source. The bulb portion is electrically coupled to the strip portion. An end of the bulb portion away from the strip portion is semi-circular in shape.

Abstract: A method for determining a communication path of millimeter wave signal and measurement device using the method includes a first measuring device and a second measuring device. The first measurement device queries a list to determine a first AOD of the first measurement device corresponding to a LOS, and controls the array antenna of the first measurement device to send the millimeter wave signal at the first AOD of the first measurement device corresponding to the LOS to the second measurement device. The second measurement device queries the list to determine a first AOA of the second measurement device corresponding to the LOS, and controls the array antenna of the second measurement device to receive the millimeter wave signal at the first AOA of the first measurement device corresponding to the LOS. Thus, a downlink between the first measurement device and the second measurement device can be quickly established.

Abstract: An envelope tracking device includes a fine slot peak tracking (FSPT) circuit, at least one power amplifier, and an envelope modulator. The FSPT circuit is connected to the power amplifier through the envelope modulator. The FSPT circuit generates envelope signals based on input signals, adds an offset to the envelope signals, and expands and smoothes the added envelope signals. The envelope modulator generates envelope voltage signals according to the smoothed envelope signals, and outputs the signals to drain of the power amplifier. The envelope voltage signals are time-aligned with the amplified signals which are transmitted to gate of the power amplifier.

Abstract: A heterogeneous network includes a first base station, a number of second base stations and a mobile device. The mobile device communicates with the second base stations via mm-wave signals and send, via wireless signals, the first base station a position of the mobile device and a request for connecting with one of the second base stations. The first base station determines one of the second base stations to connect with the mobile device according to the position and the request sent by the mobile device. The first base station sends, via the wireless signals, the mobile device a first beam angle information and triggers the mobile device and the one determined second base station to perform a beam training process according to the first beam angle information.

Abstract: An antenna module includes a plurality of antenna units, wherein one of the antenna units includes a fixed phase and the other antenna units respectively include a phase adjusted in response to the fixed phase.

Abstract: An antenna structure includes a first array antenna having a number of first antenna units. The antenna units are arranged along a first direction and a second direction. The first antenna units are monopole antennas. The monopole antennas include a radiating body having a strip portion and a bulb portion. The radiating body generates radiation along the first direction or the second direction. The strip portion is electrically coupled to a signal source. The bulb portion is electrically coupled to the strip portion. An end of the bulb portion away from the strip portion is semi-circular in shape.

Abstract: A measurement method for measuring millimeter wave (mm-wave) signal and device using the method includes a first measuring device receiving a mm-wave signal by an array antenna at a first angle of arrival corresponding to a position of the first measuring device, the mm-wave signal being sent by a second measuring device at a first angle of departure. Thereby, a downlink between the first measuring device and the second measuring device can be established quickly. From a certain ascertainable location, the first measurement device sends the mm-wave signal by the array antenna at a second angle of departure, and the second measurement device receives the mm-wave signal at a second angle of arrival corresponding to the position of the first measuring device, thus, an uplink between the first measuring device and the second measuring device can be established quickly.

Abstract: A cavity filter includes a housing, the housing includes resonant cavity groups, each of the resonant cavity groups has two resonant cavities, a partitioning portions is provided between the two resonant cavities, and the partitioning portions is provided with an adjustment passage running through the two resonant cavities. A cover plate is mounted on the housing to cover the resonant cavity groups. A resonating assembly includes a resonant tube, a resonant cap connected with the resonant tube, and a resonant adjustment screw provided in the resonant tube. The resonant tube is disposed on the inner wall of the resonant cavities. The resonant cap is opposite the cover plate. A coupling adjustment assembly is used for reducing the magnetic coupling amount between the two resonant cavities and enhancing the electrical coupling amount between the two resonant cavities.

Abstract: An envelope tracking device includes a fine slot peak tracking (FSPT) circuit, at least one power amplifier, and an envelope modulator. The FSPT circuit is connected to the power amplifier through the envelope modulator. The FSPT circuit generates envelope signals based on input signals, adds an offset to the envelope signals, and expands and smoothes the added envelope signals. The envelope modulator generates envelope voltage signals according to the smoothed envelope signals, and outputs the signals to drain of the power amplifier. The envelope voltage signals are time-aligned with the amplified signals which are transmitted to gate of the power amplifier.

Abstract: A heterogeneous network includes a first base station, a number of second base stations and a mobile device. The mobile device communicates with the second base stations via mm-wave signals and send, via wireless signals, the first base station a position of the mobile device and a request for connecting with one of the second base stations. The first base station determines one of the second base stations to connect with the mobile device according to the position and the request sent by the mobile device. The first base station sends, via the wireless signals, the mobile device a first beam angle information and triggers the mobile device and the one determined second base station to perform a beam training process according to the first beam angle information.

Abstract: A cavity filter includes a housing, the housing includes resonant cavity groups, each of the resonant cavity groups has two resonant cavities, a partitioning portions is provided between the two resonant cavities, and the partitioning portions is provided with an adjustment passage running through the two resonant cavities. A cover plate is mounted on the housing to cover the resonant cavity groups. A resonating assembly includes a resonant tube, a resonant cap connected with the resonant tube, and a resonant adjustment screw provided in the resonant tube. The resonant tube is disposed on the inner wall of the resonant cavities. The resonant cap is opposite the cover plate. A coupling adjustment assembly is used for reducing the magnetic coupling amount between the two resonant cavities and enhancing the electrical coupling amount between the two resonant cavities.

Abstract: An antenna module includes a plurality of antenna units, wherein one of the antenna units includes a fixed phase and the other antenna units respectively include a phase adjusted in response to the fixed phase.

Abstract: A compensation circuit in a MIMO system includes a phase shifting circuit and an attenuation circuit. The phase shifting circuit includes a plurality of phase shifters coupled in parallel which apply compensation to signals. The attenuation circuit includes a plurality of attenuators coupled in parallel to apply compensation to signals.

Abstract: A compensation circuit in a MIMO system includes a phase shifting circuit and an attenuation circuit. The phase shifting circuit includes a plurality of phase shifters coupled in parallel which apply compensation to signals. The attenuation circuit includes a plurality of attenuators coupled in parallel to apply compensation to signals.

Abstract: An interference-cancelling circuit includes a main delay line, a first power divider, a first power combiner, and first circuits. The main delay line delays a number of transmitting signals. The first power divider is coupled to the main delay line. Each of the first circuits including n branch circuits is configured to generate cancellation signals for canceling leakage signals (where “n” is an integer of 2 or more). A first branch circuit of the n branch circuits is coupled between the first power divider and the first power combiner. A (k?1)-th branch circuit of the n branch circuits is coupled to a k-th branch circuit of the n branch circuits (where “k” is an integer from 2 to n). The first power combiner outputs cancellation signals generated by the first circuit. A transceiver circuit is also provided.

Abstract: A cavity filter includes a housing, a resonator pipe, an adjusting screw and a lid. The lid covers on the housing. The housing includes a bottom board. The resonator pipe is fixed on the bottom board. The resonator pipe and the bottom board define a screw thread hole. The adjusting screw rotated into the housing from open end of the screw thread hole to adjust the resonance frequency of the cavity filter. The resonator pipe and the bottom board define a screw thread hole and the adjusting screw rotated into the housing from open end of the screw thread hole to save the space of out of the housing of the cavity filter.

Abstract: A cavity filter includes a slider, a driving device, and an adapter. The slider is used to slide relative to and couple with a plurality of resonators located in the cavity filter to adjust a resonating frequency of the cavity filter. The driving device is used to drive the slider slide relative to the plurality of resonators and includes a shaft having a free end. The adapter is installed between the slider and the driving device and rotateably connected to the free end of the shaft with a gap configured between the free end and the adapter.

Abstract: A cavity filter includes a slider, a driving device, an adapter and a resilient member. The slider is used to slide relative to and couple with a plurality of resonators located in the cavity filter to change a resonating frequency of the cavity filter. The driving device is used to drive the slider slide relative to the plurality of resonators. The adapter is installed between the slider and the driving device. The resilient member is elastically connected between the slider and the adapter and used to absorb vibrations of the driving device to make the slider move on an even keel.