An electrical balance duplexer has multiple impedance gradients and multiple impedance tuners. The electrical balance duplexer transmits an outgoing signal from a transmitter during a transmission mode when a first set of impedance gradients of the multiple impedance gradients is operating in a first impedance state and a first set of impedance tuners of the multiple impedance tuners is operating in a second state. The electrical balance duplexer isolates the outgoing signal from a receiver during the transmission mode when a second set of impedance gradients of the multiple impedance gradients and a second set of impedance tuners of the multiple impedance tuners are operating in the second impedance state.

An electrical balance duplexer (EBD) may be used to isolate a transmitter and receiver that share a common antenna. By using impedance gradients to provide impedances that cause balance-unbalance transformers (balun) of the EBD to cut-off access to the common antenna rather than duplicate the antenna impedance, the EBD is balanced. Such cut-offs may have a lower insertion loss than an EBD that merely duplicates the antenna impedance to separate the differential signals of the receiver/transmitter from the common mode signal.

An electrical balance duplexer (EBD) may be used to isolate a transmitter and receiver that share a common antenna. By using impedance gradients to provide impedances that cause balance-unbalance transformers (balun) of the EBD to cut-off access to the common antenna rather than duplicate the antenna impedance, the EBD is balanced. Such cut-offs may have a lower insertion loss than an EBD that merely duplicates the antenna impedance to separate the differential signals of the receiver/transmitter from the common mode signal.

A stripline radial power combiner is provided. The stripline radial combiner comprises a first stripline level comprising N radial combiner arms coupled to a first common node; a second stripline level comprising a common port coupled to a second common node; wherein the first stripline level is mounted over the second stripline level; and wherein the first common node and the second common node are coupled by a conductive via through the first stripline level and the second stripline level.

An electrical balance duplexer (EBD) may be used to isolate a transmitter and receiver that share a common antenna. By using impedance gradients to provide impedances that cause balance-unbalance transformers (balun) of the EBD to cut-off access to the common antenna rather than duplicate the antenna impedance, the EBD is balanced. Such cut-offs may have a lower insertion loss than an EBD that merely duplicates the antenna impedance to separate the differential signals of the receiver/transmitter from the common mode signal.

An electrical balance duplexer (EBD) may be used to isolate a transmitter and receiver that share a common antenna. By using impedance gradients to provide impedances that cause balance-unbalance transformers (balun) of the EBD to cut-off access to the common antenna rather than duplicate the antenna impedance, the EBD is balanced. Such cut-offs may have a lower insertion loss than an EBD that merely duplicates the antenna impedance to separate the differential signals of the receiver/transmitter from the common mode signal.

Certain aspects of the present disclosure generally relate to radio frequency (RF) front-end circuitry. For example, certain aspects provide an apparatus having a first converter circuit configured to upconvert a first baseband (BB) signal to a first RF signal based on a mode of operation, and a second converter circuit configured to upconvert a second BB signal to a second RF signal based on the mode of operation. The apparatus also includes a first RF weight adjustment circuit configured to selectively apply an amplitude weight or a phase weight to at least one of the first RF signal or the second RF signal based on the mode of operation, and a controller configured to control a power state of the second converter circuit in dependence on the mode of operation.

Certain aspects of the present disclosure generally relate to radio frequency (RF) front-end circuitry. For example, certain aspects provide an apparatus having a first converter circuit configured to upconvert a first baseband (BB) signal to a first RF signal based on a mode of operation, and a second converter circuit configured to upconvert a second BB signal to a second RF signal based on the mode of operation. The apparatus also includes a first RF weight adjustment circuit configured to selectively apply an amplitude weight or a phase weight to at least one of the first RF signal or the second RF signal based on the mode of operation, and a controller configured to control a power state of the second converter circuit in dependence on the mode of operation.

A portable communication system is provided with modular components. The modular components can include internal modules located in a base unit and external modules that can be connected to predefined terminals on the exterior of the base unit. The internal modules can include modules that provide one or more of simplex, half-duplex or full-duplex communication modes. The external modules can include modules that can provide one or more of a full-duplex communication mode or a boost to the power level of the portable communication system. An internal connection can be connected to each of the terminals to provide internal couplings to the terminals. The internal modules can be connected to the external modules by the corresponding internal connections and terminals. The configuration of the portable communication system can be changed by disconnecting the internal modules and/or external modules from the base unit and then connecting new internal modules and/or external modules to the base unit.

A front-end module, which uses a carrier aggregation method in which communication is performed by simultaneously using Band 8 and Band 3, includes an antenna switch module that switches connections between an antenna and a plurality of signal paths, a first circuit that is connected to a Band 8 signal path, and a second circuit that is connected to a Band 3 signal path and is electromagnetic-field coupled with the first circuit. A signal including a Band 3 frequency component that propagates from the signal path to the signal path via the antenna switch module and a signal including a Band 3 frequency component that propagates from the signal path to the signal path via the first circuit and the second circuit have a phase-shifted relationship with each other.