The apparatus includes a first xPlexer, coupled to a first antenna, including first and second filters; a second xPlexer, coupled to a second antenna, including third and fourth filters; a first switched xPlexer including fifth and sixth filters coupled to the second filter of the first xPlexer; a second switched xPlexer including seventh and eighth filters coupled to the fourth filter of the second xPlexer; a first transceiver coupled to the first filter of the first xPlexer and selectively coupled to the fifth filter of the first switched xPlexer; a second transceiver coupled to the third filter of the second xPlexer and selectively coupled to the seventh filter of the second switched xPlexer; a third transceiver selectively coupled to either the fifth or sixth filter of the first switched xPlexer; and a fourth transceiver selectively coupled to the seventh or eighth filter of the second switched xPlexer.

A radio frequency front end system can include a first module configured to provide multi-input multi-output (MIMO) receive operations for a first plurality of mid bands and a first plurality of high bands. The first module can be further configured to provide transmit operations for the plurality of mid bands. The first module can include a first node. The radio frequency front end system can include a second module configured to provide transmit and receive operations for a second plurality of mid bands and a second plurality of high bands. The second module can be a power amplifier integrated duplexer (PAiD) module. The second module can include a second node. The first module and the second module can be coupled by a signal path at the first node and the second node, respectively.

Aspects of this disclosure relate to bandpass filters with enhanced out of band rejection. The bandpass filters include a stage that is modified using a network of three inductors two of which are mutually coupled inductors. Related methods, radio frequency systems, radio frequency modules, and wireless communication devices are also disclosed.

According to various embodiments, there may be provided a radio frequency front end (RFFE) device comprising: a plurality of ports each connectable to an antenna, a first circuit configured to process a first signal for a first operating frequency band included in a first frequency band group, a second circuit configured to process a second signal for a second operating frequency band included in a second frequency band group, a diplexer including a first end electrically connected with a first port of the plurality of ports, a second end, and a third end, a first switch connected to a first conductive line connecting the first circuit and a second port of the plurality of ports and electrically connecting or electrically separating the second end of the diplexer to/from the first circuit and the second port based on a state, and a second switch connected to a second conductive line connecting the second circuit and a third port of the plurality of ports and electrically connecting or electrically separating the third end of the diplexer to/from the second circuit and the third port based on a state.

A method of operating a radio receiver device comprises receiving a plurality of signals with a plurality of corresponding frequencies; applying respective gains to each of the plurality of signals; and storing the gain applied to each signal and its corresponding frequency. The method comprises subsequently receiving a further signal with a further frequency; and applying a further gain to the further signal. The further gain is determined using at least one of the stored gains according to a difference between the further frequency and at least one of the plurality of corresponding frequencies.

An example multiplexer may include a first port connected to a power amplifier, a second port connected an antenna, a third port connected to a low noise amplifier, a first filter configured to allow a first transmission signal corresponding to a first frequency band and obtained through the first port to pass therethrough so as to be output to the second port, a second filter configured to allow a second transmission signal corresponding to a second frequency band different from the first frequency band and obtained through the first port to pass therethrough so as to be output to the second port, and a third filter configured to allow a first reception signal corresponding to a third frequency band and a second reception signal corresponding to a fourth frequency band, which are obtained through the second port, to pass therethrough so as to be output to the third port.

A radio frequency module includes a filter that is arranged on a first path connecting a common terminal and a first input/output terminal and has a first frequency band as a pass band, another filter that is arranged on a second path connecting the common terminal and a second input/output terminal and has a second frequency band different from the first frequency band as a pass band, and a detection circuit connected to the first path and configured to detect a leakage signal in the second frequency band leaked to the first path and output a signal indicating a detection result.

A radio-frequency circuit that conveys a radio-frequency signal that is of a predetermined frequency band and modulated using 256-Quadrature Amplitude Modulation (QAM). The magnitude slope, which is the ratio of (i) the change in a magnitude ratio between an input signal and an output signal to (ii) the change in the frequency of the input signal, is at least −0.1 dB/MHz and at most 0.1 dB/MHz in the predetermined frequency band.

The radio frequency front-end systems herein include modules having bandwidth controllable components, such as amplifier and filters. By implementing the modules with bandwidth control, the same module can be used for operation of multiple frequency bands including a first frequency band and a second frequency band. Thus, when implementing features such as carrier aggregation, multiple-input multiple-output (MIMO), and/or sounding resource signaling (SRS) for supporting the multiple frequency bands, the total number of modules used can be reduced and/or additional feature support can be provided compared to an implementation in which each module supports a single frequency band.

Provided is a radio-frequency Power Amplifier Modules including Duplexers (PA Mid) device. The radio-frequency PA Mid device has a coupling output port (CPLOUT), a coupling input port (CPLIN), and an antenna port (ANT). The radio-frequency PA Mid device includes: a transceiving circuit (110) configured to support transceiving control of a radio-frequency signal; a coupling unit (120) including an input port (a), an output port (b), a first coupling port (c) configured to couple the radio-frequency signal and output a forward coupled signal, and a second coupling port (d) configured to couple a reflected signal of the radio-frequency signal and output a reverse coupled signal; and a coupling switch (130) configured to selectively output, via the coupling output port (CPLOUT), the forward coupled signal, the reverse coupled signal, or an external coupled signal received via the coupling input port (CPLIN).