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Five different versions of grounded coplanar waveguide (GCPW) branch-line couplers on GaAs were EM simulated, processed and investigated for operation in G-band (140–220 GHz), based on different layer structures (including 2 or 3 metallization layers) and layouts. The best results have been obtained with the structures based on a continuous galvanic metal in the central conductor line and ohmic connections...
The transmission of complex modulated data signals with data rates up to 30 Gbit/s is successfully realized using a 240 GHz wireless link based on active MMIC components. The paper presents the transmission of QPSK and 8-PSK modulated signals over a distance of 40 m as well as a characterization of the RF frontend based on S-parameter measurements and back-to-back signal transmission. The link quality...
The range of radar and communication systems working in the atmospheric window around 140 GHz strongly is limited by the output power of the transmit amplifier. To allow for long range application, a broadband power amplifier with 145 GHz center frequency and a −3dB bandwidth from 130 GHz to 160 GHz has been developed. It makes use of a binary power dividing topology, which is compact size and allows...
For application at frequencies around 140 GHz, a solid-state amplifier with variable output matching was developed. Its output matching network makes use of a capacitively loaded shunt switch in series and a shunt switch in parallel. By variation of the control voltages of the series and parallel switches, the output impedance continuously can be changed in a wide range. This makes the circuit very...
Using three dimensional (3-D) electromagnetic (EM) field simulations, a fully scalable grounded coplanar waveguide (GCPW) passive library was developed. It allows for all impedances between 28 and 68Ohm. The library contains all coplanar elements needed for accurate millimeter-wave monolithic integrated circuit (MMIC) design, i.e. straight transmission lines, discontinuities, such as round bends,...
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