Abstract: A hybrid filter may include sum, low-pass, high-pass, and intermediate nodes. A terminating impedance may couple the intermediate node to a circuit ground. A first low-pass network may couple the sum node to the low-pass node, and a first high-pass network may couple the sum node to the high-pass node. A second low-pass network may couple the high-pass node to the intermediate node. A second high-pass network may couple the low-pass node to the intermediate node. The second high-pass network may include the series connection of a first capacitor, a coupling network, and a second capacitor. The coupling network may include two coupling sections each with planar broadside-coupled first, second, and third conductor elements separated by dielectric layers. The first and third conductor elements in each section may be connected electrically in parallel.

Abstract: An ultra wide band-pass, absorptive band-reject filter has a pair of quadrature hybrid couplers cascaded and coupled by a phase shifting element and a matched pair of band-reject filters in two parallel paths. The matched pair of band-reject filters each rejects signals in a desired reject frequency band. The quadrature hybrid couplers each have an insertion loss amplitude crossover for signals propagated to terminals across the coupler that coincides with the reject frequency band. The phase shifting element is configured to have a phase shift of 180 degrees at frequencies in the reject frequency band. In a preferred embodiment, the pair of quadrature hybrid couplers are identical in performance and the band-reject filters are identical in performance with respect to a center frequency fn of the reject frequency band. The absorptive band-reject filter thereby provides an absorptive rejection response in the reject frequency band while a very wide pass-band frequency range is maintained.

Abstract: A phase-shift network may include a lattice network including a first capacitor coupling a first circuit node to a second circuit node, a second capacitor coupling a third circuit node to a fourth circuit node, and a first inductor coupling the first circuit node to the fourth circuit node. A first coupled section may couple a single-ended input node to the lattice network. A second coupled section may couple the lattice network to a single-ended output node. Each coupled section may include a plurality of conductors that may form a transmission line, such as a coaxial transmission line or a stripline. A high-pass circuit may couple the input node to the first coupled section. A phase difference network may include a signal divider producing two intermediate signals coupled to respective phase-shift networks producing output signals having substantially constant phase difference over a frequency range.

Abstract: An ultra wide band-pass, absorptive band-reject filter has a pair of quadrature hybrid couplers cascaded and coupled by a phase shifting element and a matched pair of band-reject filters in two parallel paths. The matched pair of band-reject filters each rejects signals in a desired reject frequency band. The quadrature hybrid couplers each have an insertion loss amplitude crossover for signals propagated to terminals across the coupler that coincides with the reject frequency band. The phase shifting element is configured to have a phase shift of 180 degrees at frequencies in the reject frequency band. In a preferred embodiment, the pair of quadrature hybrid couplers are identical in performance and the band-reject filters are identical in performance with respect to a center frequency fn of the reject frequency band. The absorptive band-reject filter thereby provides an absorptive rejection response in the reject frequency band while a very wide pass-band frequency range is maintained.

Abstract: A multi-coupler system for isolating radio signals in a transceiver, that includes a transmitter and a receiver, to permit simultaneous transmit by the transmitter and receive by the receiver through a single antenna in the exact same or nearby frequency ranges. This is done so that in-coming receive signals, transmitted from a remotely located radio, being detected by the receiver is much stronger than the portion of the transmit signal unintentionally coupled over by the co-site (or co-located) transmitter. The invention uses a special electronic circuit, termed the quasi-circulator, to couple the antenna to both the co-located receiver and the transmitter. The invention can also be used to couple several transceivers to a single antenna. The quasi-circulator circuit includes a simulated antenna load with an impedance matched to the antenna impedance.

Abstract: A radio radio quasi-circulator-jammer system, which connects a transceiver and a jammer unit to a single antenna, for isolating the transceiver from the co-located transmitter jammer. The radio quasi-circulator-jammer system includes includes a quasi-circulator having a transformer, a matched electrical load having an electrical impedance substantially matched to the antenna electrical impedance and three radio signal splitters adapted to split incoming radio power signals into two substantially equal outgoing radio power signals.

Abstract: A radio link with two communicating transceivers each having a system for isolating incoming and outgoing radio signals to permit simultaneous transmit and receive by each transceiver on the same frequency or in the same frequency range. This is done so that in-coming receive signals received by each of the transceivers from the other transceiver is much stronger than the portion of its own transmitted signal that is coupled back into its antenna. The invention uses a special electronic circuit, termed the iso-circulator, to couple the antenna to both the co-located receiver and the transmitter. The iso-circulator circuit includes a simulated antenna load with an impedance matched to the antenna impedance. The circuit also includes a transformer with its primary side fed asymmetrically by the antenna so that it can pass the desired receive signal with minimum attenuation.

Abstract: The present invention is directed to ProMac signature genes and methods and kits for using the ProMac signature genes for diagnostic, prognostic, or monitoring ProMac associated diseases.

Abstract: A wide bandwidth, high power amplifier system for amplifying a signal in a radio frequency (RF) system in a specific bandwidth within the frequency range from 1 MHz to 100 GHz. The system includes a number of amplifier modules and an equal number of input transformers connected in series, with each input transformer providing an input signal to one amplifier module. It also includes an equal number of output transformers connected in series with each output transformer receiving an input signal from one amplifier module. The series of input transformers, the series of output transformers and the amplifier modules each provide an impedance matched approximately to the impedance of the RF system.

Abstract: A multi-coupler system for isolating radio signals in a transceiver, that includes a transmitter and a receiver, to permit simultaneous transmit by the transmitter and receive by the receiver through a single antenna in the exact same or nearby frequency ranges. This is done so that in-coming receive signals, transmitted from a remotely located radio, being detected by the receiver is much stronger than the portion of the transmit signal unintentionally coupled over by the co-site (or co-located) transmitter. The invention uses a special electronic circuit, termed the quasi-circulator, to couple the antenna to both the co-located receiver and the transmitter. The invention can also be used to couple several transceivers to a single antenna. The quasi-circulator circuit includes a simulated antenna load with an impedance matched to the antenna impedance.