The invention discloses a power noise suppression circuit applied to a power system. The power noise suppression circuit comprises at least one power noise to heat converter and at least one anti-power noise transmitted unit. When a power noise within a specific frequency band enters the power noise suppression circuit, the power noise to heat converter converts the power noise to a thermal energy, and the anti-power noise transmitted unit reflects the power noise within the specific frequency band to the power noise to heat converter. Accordingly, the power noise within the specific frequency band can be suppressed and absorbed in the power noise suppression circuit, so as to maintain the stability of the power system.

Provided is a microwave filter system having a feedback structure. The microwave filter system may include an input hybrid coupler configured to output first output signals having a phase difference with respect to an input signal; filters disposed to be in parallel with an output end of the input hybrid coupler, and configured to filter the first output signals; and an output hybrid coupler configured to output second output signals having a phase difference with respect to each of signals filtered through the filters. An output signal of the output hybrid coupler is applied to an input end of the input hybrid coupler along a feedback path.

Provided is a microwave filter system having a feedback structure. The microwave filter system may include an input hybrid coupler configured to output first output signals having a phase difference with respect to an input signal; filters disposed to be in parallel with an output end of the input hybrid coupler, and configured to filter the first output signals; and an output hybrid coupler configured to output second output signals having a phase difference with respect to each of signals filtered through the filters. An output signal of the output hybrid coupler is applied to an input end of the input hybrid coupler along a feedback path.

A power combiner and divider device includes a first port electrically connected to a first impedance line and a second impedance line; a second port electrically connected to the first impedance line and a coupled line; a third port electrically connected to the second impedance line and the coupled line; a third impedance line electrically connected to the coupled line; and a fourth impedance line electrically connected to each of the third impedance line and the coupled line.

A power combiner and divider device includes a first port electrically connected to a first impedance line and a second impedance line; a second port electrically connected to the first impedance line and a coupled line; a third port electrically connected to the second impedance line and the coupled line; a third impedance line electrically connected to the coupled line; and a fourth impedance line electrically connected to each of the third impedance line and the coupled line.

A noise reducing electronic component is used as mounted on a circuit board. The noise reducing electronic component includes: a floating electrode disposed so as to be capacitively coupled to a ground conductor of the circuit board; a radiation element connected to the floating electrode; and a shielding member to shield electromagnetic waves radiated from the radiation element. With this noise reducing electronic component, noise in a printed circuit board and the like can be reduced.

A module includes: a first diplexer including a common terminal coupled to a first antenna, a first terminal, and a second terminal; a first duplexer including a common terminal coupled to the first terminal of the first diplexer and allowing transmission and a reception signals of a first band to pass therethrough; a second duplexer including a common terminal coupled to the second terminal of the first diplexer and allowing transmission and reception signals of a second band of which a frequency band is higher than a frequency band of the first band to pass therethrough; and a third duplexer including a common terminal coupled to a second antenna different from the first antenna and allowing transmission and reception signals of a third band of which a frequency band is between the frequency band of the first band and the frequency band of the second band to pass therethrough.

A module includes: a first diplexer including a common terminal coupled to a first antenna, a first terminal, and a second terminal; a first duplexer including a common terminal coupled to the first terminal of the first diplexer and allowing transmission and a reception signals of a first band to pass therethrough; a second duplexer including a common terminal coupled to the second terminal of the first diplexer and allowing transmission and reception signals of a second band of which a frequency band is higher than a frequency band of the first band to pass therethrough; and a third duplexer including a common terminal coupled to a second antenna different from the first antenna and allowing transmission and reception signals of a third band of which a frequency band is between the frequency band of the first band and the frequency band of the second band to pass therethrough.

A wide band radio frequency (RF) circulator is presented. The RF circulator includes at least one stage having four ports configured to circulate an input RF signal from a first port to a second port while isolating a third port, from the second port to the third port while isolating the first port, and from the third port to the first port while isolating the first port, wherein the fourth port is grounded; and wherein the at least one stage includes at least a pair of couplers connected via a delay line, wherein each coupler includes a main transmission line and a coupling transmission line disposed on distinct dielectric layers.

A capacitive micromachined ultrasound transducer (cMUT) is provided. The cMUT has a first layer having a first electrode and a second layer having a second electrode opposing the first electrode to define a gap width therebetween. At least one of the first layer and the second layer includes a flexible layer having a contact area in contact to a support, such that the first electrode and the second electrode are movable relative to each other to cause a change of the gap width. The support has two substantially continuous shoulder sides each extending along with the flexible layer, each shoulder side making graduated contact with more contact area of the flexible layer as the flexible layer deforms toward the shoulder side, causing the flexible layer to have a dynamically changing spring strength.