Johann Wolfgang Goethe-universitat Frankfurt A.m.

Johann Wolfgang Goethe-universitat

Johann Wolfgang Goeth-universität Frankfurt A.m.

Johann Wolfgang Goethe-universitat Frankfurt Am Main

Hartmut Roskos

Alvydas Lisauskas

Ullrich Pfeiffer

Sebastian Boppel

Peter Haring Bolivar

Viktor Krozer

René Beigang

Erik Öjefors

Torsten Löffler

Erik Oejefors

Torsten Loeffler

The invention relates to a device for detecting electromagnetic radiation in the THz frequency range, comprising at least one transistor (FET, FET), which has a first electrode, a second electrode, a control electrode, and a channel between the first electrode and the second electrode, and comprising an antenna structure. An electrode is connected to the antenna structure such that an electromagnetic signal which lies in the THz-frequency range and which is received by the antenna structure () can be fed into the channel between electrodes and the control electrode is connected to an electrode via a capacitor and/or the control electrode and the first electrode or the control electrode and the second electrode have an intrinsic capacitor such that no AC voltage drop occurs between the control electrode and the first electrode or the second electrode.

Monolithically integrated antenna and receiver circuit

A sub-harmonic electronic mixer has at least one field effect transistor (FET) having a gate, source, and drain; and a useful signal input at a useful frequency; and a local oscillator input. The input receives the oscillator signal at a frequency being an integral fraction of the useful frequency, plus or minus a mixing frequency to provide a signal output. A gate of the FET and/or the drain and/or the source receives the useful signal to generate a gate-source voltage and/or a drain-source voltage whereby the gate receives the local oscillator signal to generate a gate-source voltage, and the drain or a source receives the local oscillator signal to generate a drain-source voltage. A phase shift is introduced between the signal received at the gate and the signal received at the drain or source of the FET.

Subharmonic mixer

The invention relates to devices comprising field effect transistors to detect the power of an electromagnetic high frequency signal V. According to the prior art, the high frequency signal is coupled into the gate G and via a capacitor Cinto the drain D of the field effect transistor FET, the gate G being biased with a direct voltage Vwhich corresponds to the threshold value of the FET transistor. The resulting current at the source S contains a direct current portion Iwhich is proportional to the square of the amplitude of the high frequency signal. The operating frequency of said power detectors is limited to a few gigahertz (GHz) by the discrete arrangement and especially by the predetermined gate length of the field effect transistor. The aim of the invention is to improve a resistive mixer in such a manner that it can be operated at high gigahertz and terahertz frequencies. For this purpose, the resistive mixer comprises a line which has a first and a second electrical conductor having respective connecting contacts so that an electrical high frequency signal can be coupled into the line, the first conductor having a plurality of series-connected voltage-dependent resistor elements (R) and at least one capacitive element (C) being interposed between the first and the second conductor.

Distributive resistive mixer

The present invention concerns a device for generating and detecting coherent electromagnetic radiation () in the THz frequency range, comprising an optically parametric oscillator () for generating electromagnetic radiation in the THz frequency range (). To provide a device for generating and detecting electromagnetic radiation in the THz frequency range it is proposed in accordance with the invention that it has a coherent phase-sensitive detector () for detecting intensity and phase of the electromagnetic radiation () generated by the optically parametric oscillator ().

Device and method for generating and detecting coherent electromagnetic radiation in the THz frequency range

The present invention relates to a device for detecting millimeter waves, having at least one field effect transistor with a source, a drain, a gate, a gate-source contact, a source-drain channel, and a gate-drain contact. Compared to a similar such device, the problem addressed by the present invention, among others, is that of providing a device which enables the provision of a field effect transistor for detecting the power and/or phase of electromagnetic radiation in the Thz frequency range. In order to create such a device, it is suggested according to the invention, that a device be provided which has an antenna structure wherein the field effect transistor is connected to the antenna structure in such a manner that an electromagnetic signal received by the antenna structure in the THz range is fed into the field effect transistor via the gate-source contact, and wherein the field effect transistor and the antenna structure are arranged together on a single substrate.

Monolithically integrated antenna and receiver circuit for the detection of terahertz waves

Growing community of inventors

Kronberg, Germany

Hartmut Roskos