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The first modular 4-channel frontend for exploring phased array communications at a carrier frequency of 300 GHz was developed. A metamorphic HEMT process with a gate length of 35 nm was the key enabling technology for the integration of each transmit and receive channel. All channels implemented the quadrature direct conversion architecture. The measured RF bandwidth exceeded 55 GHz for the receive...
The application of frequencies beyond 300 GHz in the so-called THz frequency range requires electronic beam steering, which can be realized by a phased array. In this paper, measurement results of a novel 300 GHz phased array antenna with horn elements and a targeted gain of 20.7 dBi for THz communications are presented. The results are compared to simulations with respect to antenna patterns, gain,...
For THz communication systems, highly directive antennas are required to overcome the high free space path losses. For this reason, electrical beam steering is one of the key challenges for future applications. In this paper, a design for a first electrically steerable antenna operating at around 300 GHz is presented. The design is based on a phased array which consists of four horn antenna elements...
This paper presents the transmission of broadband complex modulated signals with data rates up to 64Gbit/s using an analog front-end based on monolithic microwave integrated circuits (MMICs) at a carrier frequency of 300GHz. Besides the typical modulation formats like BPSK, QPSK, and 16QAM a non-common modulation format 8APSK is introduced and measured. The maximal transmitter symbol rate is 32Gbd...
Communication systems operating in indoor environments and at frequencies from 60 GHz up to the THz range may suffer severely from dynamic human blockage. Previous studies have shown the influence of a single person on a single (static) link. In this paper, a model for the prediction of a time-variant scenario for a simple conference room with a group of persons is presented. The presented model is...
This paper presents a preliminary study of channel characteristics in the frequency ranges of 75 – 110 GHz and 270 – 320 GHz. We select a small office as a typical application scenario and carried out extensive measurements with the Vector Network Analyzer (VNA) and frequency extension units in the room. A ray tracing simulator is applied for reproduction of the measurement results and a good match...
In this paper, two different methods of determining the safety distances in the vicinity of mobile phone base stations are presented. The first one applies the Huygen's Principle and is based on near field measurements on a spherical surface, usually performed by antenna manufactures in order to calculate the far field antenna patterns. This method enables the calculation of the field strength outside...
The phased arrays provide a high antenna gain and can be applied to the future indoor Terahertz (THz) communications to compensate for the high path loss, which, however, requires a precise estimate of the direction of signal arrival. This paper presents a method for the signal arrival direction estimate in cases when the user equipment is moving in the wireless network coverage area. The method uses...
Multi Gigabit wireless links using millimeter or sub millimeter waves have become of interest to replace wired connections within devices. In order to develop and simulate the corresponding systems, propagation and channel models for intra-device environments are required. This paper describes first results from measurement campaigns carried out at 60 GHz and 300 GHz in such environments. In a first...
Future communication systems in the Terahertz range are promising very high data rates. Here a measurement setup designed for short intra- or range inter-device communication is presented. Exemplary measurement results are given for waveguide-like ABS structures. In addition the possibility to model the propagation properties with a ray tracing approach is evaluated.
Reflection and transmission properties of materials common in electronic devices are investigated for the frequency ranges of 50 GHz to 75 GHz as well as 270 GHz to 320 GHz. Material parameters are extracted by fitting the measurement results with Transfer Matrix Method simulations.
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