Abstract: One way to stop electromagnetic fields from leaking outside of a module is an electric wall. Embodiments of the present disclosure are directed to emulating an electric wall with through vias. The through vias may be arranged around cavities in the printed circuit board. The density of the through vias may be selected based on an expected wavelength of the electromagnetic fields. The printed circuit board may then self-isolate components within the cavities from the electromagnetic fields.

Abstract: A resonator may include a first terminal, a second terminal, a resonator between the first terminal and the second terminal, and a reactive element in series with a switch. The reactive element in series with the switch may be connected in parallel with the resonator. The resonator may provide a first set of resonance frequencies when the switch is operated in a non-conducting state and a second set of resonance frequencies when the switch is operated in a conducting state.

Abstract: A filter device provides a wideband passband of a communication device for a RF signal. The filter device includes a first filter circuit in parallel with a second filter circuit. The first filter circuit includes a first notch filter, and has a first notch. The second filter circuit includes a second notch filter in series with a reversal circuit for phase shifting the RF signal filtered by the second notch filter, the second filter circuit having a second notch. The first and second filter circuits form a band pass filter having a passband between a lower cutoff frequency defined by the second notch and an upper cutoff frequency defined by the first notch. The band pass filter provides low insertion loss in the passband, and high insertion loss in an adjacent lower stopband below the lower cutoff frequency and in an adjacent upper stopband above the upper cutoff frequency.

Abstract: A filter device provides a wideband passband of a communication device for a RF signal. The filter device includes a first filter circuit in parallel with a second filter circuit. The first filter circuit includes a first notch filter, and has a first notch. The second filter circuit includes a second notch filter in series with a reversal circuit for phase shifting the RF signal filtered by the second notch filter, the second filter circuit having a second notch. The first and second filter circuits form a band pass filter having a passband between a lower cutoff frequency defined by the second notch and an upper cutoff frequency defined by the first notch. The band pass filter provides low insertion loss in the passband, and high insertion loss in an adjacent lower stopband below the lower cutoff frequency and in an adjacent upper stopband above the upper cutoff frequency.

Abstract: An apparatus, includes a substrate, an electronic component disposed over the substrate, and a frame element disposed over the substrate. The frame element provides structural rigidity to the apparatus. The apparatus also includes an encapsulating material disposed over an upper surface of the substrate, the electronic component and the frame element. An electrically conductive layer is disposed over the encapsulating material.

Abstract: A multiplexer device includes an antenna node connected to an antenna for at least one of receiving and transmitting signals; multiple band pass filters connected to the antenna node, each band pass filter having a different passband; and multiple notch filters connected in to the antenna node and the multiple band pass filters, each notch filter having a different stopband corresponding to one of the passbands of the band pass filters. The notch filters are connected in parallel with one another in order to reduce insertion loss.

Abstract: A very wide bandwidth composite band pass filter with steep roll-off of a corresponding passband includes a band pass filter and a high-Q acoustic resonator. The band pass filter has a corresponding passband with a very wide bandwidth and a passband roll-off. The high-Q acoustic filter has a corresponding stopband with a roll-off steeper than the passband roll-off, the high-Q acoustic filter being connected in parallel with the band pass filter such that a portion of the stopband is within the passband of the band pass filter, forming a combined passband. A frequency range of the combined passband is approximately the same as a frequency range of the passband of the band pass filter, and a combined roll-off of the combined passband is steeper on one side than the passband roll-off of the band pass filter.

Abstract: A multiplexer device includes at least one acoustic band pass filter connected to a common port, and a hybrid LC/acoustic filter connected to the common port in parallel with the at least one acoustic band pass filter. Each acoustic band pass filter has a corresponding passband and includes multiple acoustic resonators. The hybrid LC/acoustic filter includes at least one acoustic resonator, and has at least one capacitor replaced by a corresponding at least one acoustic resonator, respectively. Each of the at least one acoustic resonator included in the hybrid LC/acoustic filter provides a stopband response when operating in a corresponding acoustic frequency range, and acts as a capacitor when operating in a corresponding non-acoustic frequency range.

Abstract: An apparatus, includes a substrate, an electronic component disposed over the substrate, and a frame element disposed over the substrate. The frame element provides structural rigidity to the apparatus. The apparatus also includes an encapsulating material disposed over an upper surface of the substrate, the electronic component and the frame element. An electrically conductive layer is disposed over the encapsulating material.

Abstract: A very wide bandwidth composite band pass filter with steep roll-off of a corresponding passband includes a band pass filter and a high-Q acoustic resonator. The band pass filter has a corresponding passband with a very wide bandwidth and a passband roll-off. The high-Q acoustic filter has a corresponding stopband with a roll-off steeper than the passband roll-off, the high-Q acoustic filter being connected in parallel with the band pass filter such that a portion of the stopband is within the passband of the band pass filter, forming a combined passband. A frequency range of the combined passband is approximately the same as a frequency range of the passband of the band pass filter, and a combined roll-off of the combined passband is steeper on one side than the passband roll-off of the band pass filter.

Abstract: A multiplexer device includes at least one acoustic band pass filter connected to a common port, and a hybrid LC/acoustic filter connected to the common port in parallel with the at least one acoustic band pass filter. Each acoustic band pass filter has a corresponding passband and includes multiple acoustic resonators. The hybrid LC/acoustic filter includes at least one acoustic resonator, and has at least one capacitor replaced by a corresponding at least one acoustic resonator, respectively. Each of the at least one acoustic resonator included in the hybrid LC/acoustic filter provides a stopband response when operating in a corresponding acoustic frequency range, and acts as a capacitor when operating in a corresponding non-acoustic frequency range.

Abstract: A multiplexer device includes at least one filtering device having at least one first band pass filter, connected to a common port via at least one series inductance, respectively, and only one or non-overlapping passbands, and at least one second filtering device, each of which includes at least one second band pass filter with a total of at least two second band pass filters are connected to the common port and having non-overlapping passbands, respectively. Combined series inductance transformed input impedance of the at least one first filtering device is inductive, when viewed from the common port, in the passbands of the at least two second band pass filters. Combined input impedance of the at least one second filtering device is substantially capacitive, when viewed from the common port, in a passband of the at least one first band pass filter in the at least one first filtering device.

Abstract: A multiplexer device includes at least one filtering device having at least one first band pass filter, connected to a common port via at least one series inductance, respectively, and only one or non-overlapping passbands, and at least one second filtering device, each of which includes at least one second band pass filter with a total of at least two second band pass filters are connected to the common port and having non-overlapping passbands, respectively. Combined series inductance transformed input impedance of the at least one first filtering device is inductive, when viewed from the common port, in the passbands of the at least two second band pass filters. Combined input impedance of the at least one second filtering device is substantially capacitive, when viewed from the common port, in a passband of the at least one first band pass filter in the at least one first filtering device.

Abstract: A multiplexer device includes an antenna node connected to an antenna for at least one of receiving and transmitting signals; multiple band pass filters connected to the antenna node, each band pass filter having a different passband; and multiple notch filters connected in to the antenna node and the multiple band pass filters, each notch filter having a different stopband corresponding to one of the passbands of the band pass filters. The notch filters are connected in parallel with one another in order to reduce insertion loss.

Abstract: A balun includes an unbalanced port having a single-ended terminal, a balanced port having first and second differential terminals, and first and second series resonant LC circuits. The first series resonant LC circuit is connected between the first and second differential terminals, and includes a first element of a first type and one element of a second type connected in series. The second series resonant LC circuit is connected between the single-ended terminal and ground, and includes second and third elements of the first type and the one element of the second type connected in series. The one element of the second type is shared by the first and second series resonant LC circuits. The first differential terminal is connected between the one element of the second type and the third element of the first type.

Abstract: A balun includes an unbalanced port having a single-ended terminal, a balanced port having first and second differential terminals, and first and second series resonant LC circuits. The first series resonant LC circuit is connected between the first and second differential terminals, and includes a first element of a first type and one element of a second type connected in series. The second series resonant LC circuit is connected between the single-ended terminal and ground, and includes second and third elements of the first type and the one element of the second type connected in series. The one element of the second type is shared by the first and second series resonant LC circuits. The first differential terminal is connected between the one element of the second type and the third element of the first type.

Abstract: An apparatus comprises a device layer structure, a device integrated into the device layer structure, an insulating carrier substrate and an insulating layer being continuously positioned between the device layer structure and the insulating carrier substrate, the insulating layer having a thickness which is less than 1/10 of a thickness of the insulating carrier substrate. An apparatus further comprises a device integrated into a device layer structure disposed on an insulating layer, a housing layer disposed on the device layer structure and housing the device, a contact providing an electrical connection between the device and a surface of the housing layer opposed to the device layer structure and a molding material surrounding the housing layer and the insulating layer, the molding material directly abutting on a surface of the insulating layer being opposed to the device layer structure.

Abstract: A duplexer includes first and second filters, and a first shielding bondwire. The first filter includes a first bondwire connecting the first filter to a printed circuit board, the first bondwire forming a portion of a first virtual loop having a first virtual area, where first current passing through the first bondwire generates a first magnetic field. The second filter includes a second bondwire connecting the second filter to the printed circuit, the second bondwire forming a portion of a second virtual loop having a second virtual area. The first shielding bondwire includes first and second ends connected to a conductor of the printed circuit board to form a closed electrical first shielding loop having a corresponding first shielding area. The magnetic field induces shielding current in the first shielding loop, which generates a first compensating magnetic field that attenuates the first magnetic field.

Abstract: In a method for manufacturing a piezoelectric oscillating circuit in thin film technology, wherein the oscillating circuit includes a predetermined natural frequency and a plurality of layers, first of all at least a first layer of the piezoelectric oscillating circuit is generated. Subsequently, by processing the first layer a frequency correction is performed. Subsequently, at least a second layer of the piezoelectric oscillating circuit is generated and processed for performing a second frequency correction.

Abstract: In a representative embodiment, a bulk acoustic wave (BAW) resonator structure comprises: a first electrode disposed over a substrate; a first piezoelectric layer disposed over the first electrode; a second electrode disposed over the first piezoelectric layer, wherein c-axis orientations of crystals of the first piezoelectric layer are substantially aligned with one another; a second piezoelectric layer disposed over the second electrode; a non-piezoelectric layer; and a third electrode disposed over the second piezoelectric layer.