An apparatus for tuning a plurality of antennas is provided. The apparatus includes a plurality of antenna ports connected to the plurality of antennas; a plurality of user ports; first adjustable impedance elements, each being connected to one of the antenna ports and ground; second adjustable impedance elements, each being connected to one of the user ports and another one of the user ports; and a plurality of connecting elements, each being connected to one of the antenna ports and one of the user ports, wherein the first and second adjustable impedance elements are configured to be adjustable so to tune the plurality of antennas.

An electronic component includes a stack, a first inductor, and a second inductor. The first inductor includes a first conductor layer, a first columnar conductor, and a second columnar conductor. The second inductor includes a second conductor layer, a third columnar conductor, and a fourth columnar conductor. At least part of the first conductor layer extends in a direction crossing an alignment direction of the first columnar conductor and the second columnar conductor at an angle other than an odd number multiple of 90 degrees. At least part of the second conductor layer extends in a direction crossing an alignment direction of the third columnar conductor and the fourth columnar conductor at an angle other than an odd number multiple of 90 degrees.

An electronic device includes a shared pin and a bandwidth extension circuit. The electronic device receives or transmits a signal through the shared pin. The bandwidth extension circuit is electrically coupled to the shared pin. The bandwidth extension circuit includes a first inductor, a second inductor, a first capacitor, a second capacitor, and a third capacitor. The first inductor is electrically connected between the shared pin and a node. The second inductor is electrically connected to the first inductor through the node. The first capacitor is electrically connected between the node and a ground. The second capacitor is electrically connected between the shared pin and the ground. The third capacitor is electrically connected between the second inductor and the ground. The first inductor is different from the second inductor. There is no coupling effect between the first inductor and the second inductor.

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 ultra-wideband assembly is provided. The assembly includes a non-conductive tapered core having a conductive wire wound on an outer surface of the non-conductive tapered core, a low-frequency inductor coupled to the non-conductive tapered core via the distal end of the conductive wire and configured to allow mounting of the non-conductive tapered core at an angle with respect to the circuit board. The low frequency inductor is being disposed on a dielectric board configured to be coupled to the circuit board. The assembly includes an ultra-wideband capacitor coupled to the non-conductive tapered core via the proximate end of the conductive wire, the ultra-wideband capacitor being also coupled to the transmission line on the dielectric board.

A non-magnetic material frequency selective limiter circuit has first and second resonators and a non-linear coupling component. The first resonator oscillates at a fundamental frequency. The second resonator oscillates at one half of the fundamental frequency. The non-linear coupling component non-linearly and parametrically couples the first resonator and the second resonator. The first resonator, second resonator and the non-linear coupling component are arranged so as to reduce the amplitude of an output signal for an input signal of frequency when an input signal amplitude is above a voltage threshold value, by converting part of the input signal to a signal at the frequency /2. The first resonator, second resonator and the non-linear coupling component are formed of non-magnetic materials.

An antenna tuning apparatus for a multiport antenna array used for sending and/or receiving electromagnetic waves for radio communication comprises: 4 antenna ports, 4 user ports, 10 adjustable impedance devices each presenting a negative reactance and having a terminal coupled to one of the antenna ports, 4 windings each having a first terminal coupled to one of the antenna ports and a second terminal coupled to one of the user ports, and 10 adjustable impedance devices each presenting a negative reactance and having a terminal coupled to one of the user ports. All adjustable impedance devices are adjustable by electrical means. Any small variation in the impedance matrix of the antenna array, caused by a change in operating frequency or a change in the medium surrounding the antennas, can be compensated with a new adjustment of the adjustable impedance devices.

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.

A method and apparatus are disclosed for filtering a signal, such as a transmit communication signal with a configurable notch filter. The configurable notch filter may attenuate a set of frequencies near a selected notch frequency. In some embodiments, the configurable notch filter may include a variable resistor, a variable capacitor, a first inductor, and a second inductor. The variable resistor may be configured to compensate for resistive losses within the configurable notch filter. The variable capacitor may be configured to determine the set of frequencies to be attenuated.

An ultra-wideband assembly is provided. The assembly includes a non-conductive tapered core having a conductive wire wound on an outer surface of the non-conductive tapered core, a low-frequency inductor coupled to the non-conductive tapered core via the distal end of the conductive wire and configured to allow mounting of the non-conductive tapered core at an angle with respect to the circuit board. The low frequency inductor is being disposed on a dielectric board configured to be coupled to the circuit board. The assembly includes an ultra-wideband capacitor coupled to the non-conductive tapered core via the proximate end of the conductive wire, the ultra-wideband capacitor being also coupled to the transmission line on the dielectric board.