Totalforsvarets Forskningsinstitut

Totalf&ouml;rsvarets Forskningsinstitut

Aziz Ouacha

Carl Samuelsson

B&ouml;rje Carlegrim

The present invention relates to a programmable microwave circuit () four ports (), and combinations of such circuits. Between each pair of ports there is at least one connection without amplification, at least one connection having amplification from a first port of the pair of ports to a second port of the pair of ports, and at least one connection having amplification from the second port to the first port. Further, there is control electronics () with the ability to open and close the respective connection and respective port, by which the microwave circuit could be configured for different purposes, such as amplifier, power splitter/power combiner and router.

Programmable microwave circuit

A distribution network which can be an active power splitter or an active power combiner or alternatingly power splitter and such a power combiner. The power splitter consists of two distributed amplifiers with a common input and one output each, and the power combiner consists of two distributed amplifiers with one input each and a common output. For the power splitter, a switching element is connected between each connection point on the outputs of the amplifying elements and ground, and for said power combiner, a switching element is connected between each connection point on the inputs of the amplifying elements and ground, the switching elements being optimised to take, depending on a control voltage, one of two distinct states. A first state corresponding to a capacitance and a second state corresponding to a low impedance short circuit. This implies that when the control voltage is high for a distributed amplifier, this amplifier transmits power, and, when the control voltage is low for a distributed amplifier, this amplifier does not transmit power. The invention also relates to a multifunctional broadband electronically steered phased array system comprising at least one power splitter or power combiner as stated above.

Reconfigurable broadband active power splitter ditto power combiner and ditto bidirectional power splitter/power combiner and circuits based on these

An artificial line, particularly an artificial electric line, and specifically an artificial line having a constant group delay in a wide frequency range (octave bandwidths). The artificial line comprises two identical inductors of the magnitude L connected in series and having a mutual inductance M, and a capacitor of the magnitude C over the inductors and a shunt capacitor C to earth. The element values as a function of the cut-off frequency f and the characteristic impedance Z are selected according to specific equations. The artificial line can then be realized as a continuously tunable artificial line or as a self-switched artificial line. The two types of artificial lines can also be cascade-coupled.

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Atvidaberg, Sweden

Aziz Ouacha