A smartphone and such devices use an ultra-high-speed digital signal. Thus, an electromagnetic wave noise emits inside. Once the electromagnetic wave noise emits in the smartphone and such devices, it stays inside. When the electromagnetic wave noise is released outside, an original accurate digital signal and an original accurate analog signal can be obtained. The sound of the smartphone and such devices becomes clear. By using a USB cable, a power supply line terminal and a ground line terminal of the electromagnetic wave noise absorber respectively connect to the power supply line terminal and the ground line terminal of the smartphone and such devices. By using a noise filter circuit and an electromagnetic noise absorber copper plate, the electromagnetic wave noise absorber absorbs the electromagnetic wave noise from the smartphone and such devices. The electromagnetic wave noise disappears in the electromagnetic noise absorber copper plate.

According to some embodiments, an on-chip diplexer circuit is disclosed. The on-chip diplexer circuit includes a LC resonator module, the LC resonator module further comprises a first port, a first LC resonator unit and a second LC resonator unit; a first filter unit, the first filter unit is electrically connected to the first LC resonator unit in the LC resonator module, and the first filter unit is electrically connected to a second port; and a second filter unit, the second filter unit is electrically connected to the second LC resonator unit in the LC resonator module, and the second filter unit is electrically connected to a third port. According to some embodiments, the first LC resonator unit serves as an impedance matching circuit for a first signal having a first resonant frequency and serves as an open circuit for a second signal having a second resonant frequency that is different from the first resonant frequency; the second LC resonator unit serves as an impedance matching circuit for the second signal having the second resonant frequency and serves as an open circuit for the first signal having the first resonant frequency. The first filter unit passes signals with the first resonant frequency; and the second filter unit passes signals with the second resonant frequency.

A power combiner/divider circuit can be structured having a base structure with the addition of an odd-mode capacitor and a low pass network at an end of the base structure or structured having a base structure with the addition of an inductor and a high pass network at an end of the base structure. The power combiner/divider circuit can be implemented as a port coupled to multiple ports with low pass networks or high pass networks arranged at the ends of paths to the multiple ports. In embodiments using low pass base structures or low pass networks coupled to the base structures, inductors in such low pass sections can be positively coupled on a pair-wise basis.

A cable television apparatus improving high frequency characteristics includes a first connector and a first choke. The first connector is electrically connected to an input coaxial cable or an output coaxial cable. The first choke is electrically connected to the first connector. The first connector includes a first signal transmission unit. The first choke is used to block a cable television signal. The first choke allows a first current flowing through the first choke. The first current is greater than or equal to 10 amperes. The first choke is directly touched the first signal transmission unit, or a connection path length between the first signal transmission unit and a pin of the first choke is less than 5 millimeters.

Transmission-line filtering with enhanced frequency response is disclosed. In an example aspect, an apparatus includes a transmission-line filter to enhance a frequency response of a filtering operation. The transmission-line filter includes an input port, an output port, and multiple transmission-line base units. The multiple transmission-line base units are disposed between the input port and the output port and are coupled to the input port and the output port. Each of the multiple transmission-line base units includes a respective transmission line of multiple transmission lines. At least one transmission-line base unit of the multiple transmission-line base units includes a multi-resonant circuit.

A re-configurable magnetoinductive waveguide (300), comprising a plurality of resonator cells, wherein each resonator cell comprises a primary resonator (110) that is inductively coupled to a primary resonator (110) of at least one other resonator cell, and wherein at least one of the plurality of resonator cells is a controllable cell (100) which further comprises a control element (120), the control element (120) having an active control component (125) that is operable to adjust the impedance of the primary resonator (110) of the controllable cell (100) in response to a control signal; wherein: the control element (120) comprises a secondary resonator, the secondary resonator is inductively coupled to the primary resonator (110), and the active control component (125) is arranged to vary the electrical properties of the secondary resonator in response to the control signal.

A lumped element directional coupler having an asymmetrical structure. The lumped element directional coupler can be integrated while being compact by using lumped elements, instead of transmission lines, have broadband characteristics through the lumped elements being asymmetrically arranged, and further increase bandwidth by additionally providing a negative capacitor element or, more particularly, a negative capacitor element having loss.

A distributed LC filter structure is disclosed. The distributed LC filter structure provides simultaneously a distributed inductance and a distributed capacitance in the same structure. Accordingly, discrete passive elements are eliminated and high, homogenous integration is achieved. Interconnections between the distributed inductance and the distributed capacitance are tailored to leverage a parasitic inductance of the distributed capacitance to increase the overall inductance of the distributed LC filter structure. Similarly, the interconnections are tailored to leverage a parasitic capacitance resulting from the distributed inductance to add up with the distributed capacitance augmenting the overall capacitance of the structure.

An inductor bridge is provided with a flexible flat plate-shaped element body, a first connector, and a second connector. The element body includes therein an inductor portion. The inductor portion is configured by a spiral conductor pattern. The first connector is provided on the element body and is connected to a first circuit. The second connector is provided on the element body and is connected to a second circuit.

An inductive-capacitive filter includes a first insulating-conductive strip wound around a winding axis, where the first insulating-conductive strip includes a first conductive strip joined with a first insulating strip. An inductive-capacitive filter assembly includes a first and a second insulating-conductive strip concentrically wound around a winding axis, the first insulating-conductive strip including a first conductive strip joined with a first insulating strip, and the second insulating-conductive strip including a second conductive strip joined with a second insulating strip.