Example multi-band phased array are described. One example multi-band phased array includes a plurality of branches coupled to a plurality of multi-band antennas. Each of the plurality of branches includes a low noise amplifier and a power amplifier. The power amplifier and the low noise amplifier are configured to transmit and receive, in a time-sharing manner, a signal of a first frequency band and a signal of a second frequency band that are received by the multi-band phased array, and the first frequency band and the second frequency band are different and do not overlap. Each of the plurality of branches further includes a phase shifter, where the phase shifter is configured to perform phase shifting on the signal of the first frequency band, and the phase shifter is further configured to perform phase shifting on the signal of the second frequency band.

Example multi-band phased array are described. One example multi-band phased array includes a plurality of branches coupled to a plurality of multi-band antennas. Each of the plurality of branches includes a low noise amplifier and a power amplifier. The power amplifier and the low noise amplifier are configured to transmit and receive, in a time-sharing manner, a signal of a first frequency band and a signal of a second frequency band that are received by the multi-band phased array, and the first frequency band and the second frequency band are different and do not overlap. Each of the plurality of branches further includes a phase shifter, where the phase shifter is configured to perform phase shifting on the signal of the first frequency band, and the phase shifter is further configured to perform phase shifting on the signal of the second frequency band.

This application is generally related to methods for improving performance in a system. One of the methods may include a step of determining whether absorbed power in a system meets a predetermined threshold. The absorbed power may be based upon first and second Walsh codes transmitted to each of first and second gain and phase modulators in the system. The first Walsh code may be orthogonal to the second Walsh code. A first set of the first and second Walsh codes may be inverted with respect to a second set of the first and second Walsh codes. The method may also include a step of modulating the absorbed power in view of the determination. The method may further include a step of transmitting feedback based upon the modulated power to the first and second gain and phase modulators.

This application is generally related to methods for improving performance in a system. One of the methods may include a step of determining whether absorbed power in a system meets a predetermined threshold. The absorbed power may be based upon first and second Walsh codes transmitted to each of first and second gain and phase modulators in the system. The first Walsh code may be orthogonal to the second Walsh code. A first set of the first and second Walsh codes may be inverted with respect to a second set of the first and second Walsh codes. The method may also include a step of modulating the absorbed power in view of the determination. The method may further include a step of transmitting feedback based upon the modulated power to the first and second gain and phase modulators.

The present disclosure provides circuit structure configured to decrease a phase difference between a first signal and a second signal. The circuit structure includes substrate. The substrate includes a first conductive layer, a first woven dielectric layer, and a second woven dielectric layer. The first conductive layer is disposed over the substrate. The first conductive layer includes a circuit pattern configured to transmit the first signal and the second signal. The first woven dielectric layer is stacked below the first conductive layer. The first woven dielectric layer has a plurality of first opens. The second woven dielectric layer is stacked below the first woven dielectric layer. The second woven dielectric layer has a plurality of second opens. The plurality of first opens and the plurality of second opens are misaligned from a top view.

Disclosed are a 3 dB orthogonal hybrid coupler, a radio-frequency front-end module and a communication terminal. The 3 dB orthogonal hybrid coupler can be arranged on a substrate, and a straight-through metal coil and a coupling metal coil are of a laminated structure, a coplanar structure or a combined form of the laminated structure and the coplanar structure, such that a corresponding radio-frequency signal input port is connected to a first radio-frequency signal output port, and an isolation port is connected to a second radio-frequency signal output port. Moreover, according to the requirements of the operating frequency and the port feature impedance of the 3 dB orthogonal hybrid coupler, the number of turns and the number of layers of the straight-through metal coil and the coupling metal coil are adjusted.

Disclosed are a 3 dB orthogonal hybrid coupler, a radio-frequency front-end module and a communication terminal. The 3 dB orthogonal hybrid coupler can be arranged on a substrate, and a straight-through metal coil and a coupling metal coil are of a laminated structure, a coplanar structure or a combined form of the laminated structure and the coplanar structure, such that a corresponding radio-frequency signal input port is connected to a first radio-frequency signal output port, and an isolation port is connected to a second radio-frequency signal output port. Moreover, according to the requirements of the operating frequency and the port feature impedance of the 3 dB orthogonal hybrid coupler, the number of turns and the number of layers of the straight-through metal coil and the coupling metal coil are adjusted.

An apparatus is disclosed for harmonic reduction with filtering. In example aspects, the apparatus includes a filter circuit with first and second filter ports, first and second lattice filters, and first and second signal manipulator circuits. The first signal manipulator circuit includes a first port, a second port, and a third port coupled to the first filter port. The first signal manipulator circuit splits an input signal into multiple split signals, shifts a phase thereof to produce at least one phase-shifted split signal, and provides the phase-shifted split signal to the first and second ports. The first lattice filter is coupled to the first port, and the second lattice filter is coupled to the second port. The second signal manipulator circuit includes a first port coupled to the first lattice filter, a second port coupled to the second lattice filter, and a third port coupled to the second filter port.

An apparatus is disclosed for harmonic reduction with filtering. In example aspects, the apparatus includes a filter circuit with first and second filter ports, first and second lattice filters, and first and second signal manipulator circuits. The first signal manipulator circuit includes a first port, a second port, and a third port coupled to the first filter port. The first signal manipulator circuit splits an input signal into multiple split signals, shifts a phase thereof to produce at least one phase-shifted split signal, and provides the phase-shifted split signal to the first and second ports. The first lattice filter is coupled to the first port, and the second lattice filter is coupled to the second port. The second signal manipulator circuit includes a first port coupled to the first lattice filter, a second port coupled to the second lattice filter, and a third port coupled to the second filter port.

A power divider/combiner includes a first transmission line that includes a first part and a second part, and a second transmission line and a third transmission line that are electromagnetically coupled with the first transmission line. The first part, the second part, the second transmission line and the third transmission line are each of a particular length. The first part, the second transmission line and the third transmission line are respectively connected to a first port, a second port and a third port for inputting/outputting signals having a target wavelength equal to four times the particular length.