I. Kallfass
u. a., „High System Gain E-Band Link in a Wideband Aircraft-to-Ground Data Transmission“, in
2019 IEEE International Conference on Microwaves, Antennas, Communications and Electronic Systems (COMCAS), 2019, S. 1–5. doi:
10.1109/COMCAS44984.2019.8958387.
Zusammenfassung
A wireless communication link operating in E-band at 71-76 GHz with 30 dBm of transmit power from a GaN-based solid-state power amplifier and a 3-dB noise Figure of its GaAs-based receiver is employed in a data transmission with up to 9.8 Gbit/s data rate between a plane and a ground station. Flying at a height of 1000 m above ground and at distances between 5 and 12 km from the receiver, a microlight aircraft hosts the payload mounted to its wing. The highly directional link is formed by a 39.7 dBi gain Cassegrain parabolic antenna in the plane-mounted transmitter, and a 48.7 dBi Cassegrain antenna with GPS-based antenna tracking in the ground terminal. Stable data links were established with up to 9.8 Gbit/s data rate employing QPSK, 8-PSK and 16-QAM modulation.BibTeX
S. M. Dilek, B. Schoch, und I. Kallfass, „Performance Analysis of Real-Time Full-Duplex E-band Link“, in
2019 49th European Microwave Conference (EuMC), 2019, S. 976–979. doi:
10.23919/EuMC.2019.8910936.
Zusammenfassung
In this paper, a performance analysis of a full-duplex E-band link is reported. The transmission system is operated with a real-time capable modem as a digital signal processing unit with broadband mixed-signal blocks. The measurement has been done with a 1.425 gigabaud-per-second data rate transmission for higher order modulations. A raised-cosine pulse-shaping filter is used with a 0.5 roll-off factor. A residual bit-error-rate which is below the forward-error correction limit is measured. The uplink (81–86 GHz band) transceiver and the downlink (71–76 GHz band) transceiver of the E-band duplex-link provide a 64-QAM transmission which has a 7.5 gigabit-per-second data-rate with a back-to-back configured setup. The 32-QAM and the 16-QAM which provide 6.2 and 5 gigabit-per-second data transmission, respectively are analyzed as well. The paper analyzes the influence of the main analog front-end impairments, noise and amplifier compression, including a real-time capable modem sensitivity over the entire full-duplex E-band communication system performance, i.e. their upper and lower threshold limit for the received power, for different modulation formats and relates these limits to the power compression of the analog frontend's transfer characteristics.BibTeX
B. Schoch, L. Manoliu, J. Keim, S. Chartier, S. Klinkner, und I. Kallfass, „Link budget analysis of E- and W-band satellite services“, in 25th Ka and Broadband Communications Conference, Sorrento, S. 1--8, 2019.
Zusammenfassung
This work describes the dynamic link budgets arising in ultra-high data rate satellite communication
links in the E- and W-band operating in low earth orbits (LEO). The calculations take into account
all available ITU models for atmospheric effects, the current state of the art in achievable system
gain, i.e. transmit power and receiver sensitivity, prospective antenna realisations, and arbitrary
low-earth orbits and locations of ground terminals.
In this work, we calculate link-budgets for different LEO scenarios for defined ground stations. The
communication systems are described on a high-level basis, where it is possible to estimate the
link quality and capacity. The communication system is derived from state-of-art performance of
E/W-band components. Antenna sizes, pointing accuracy and probability densities are taken into
account to describe a full satellite mission with focus on the communication channel. A time
dependent SNR can be estimated to calculate thresholds for modulation formats and link reliability.
Calculation are made to predict the energy per useful bit to noise density ratio (E b /N 0 ) for a LEO-
satellite pass through the zenith at an orbit altitude of 400 km. Finally, the achievable data volume
can be estimated for each atmospheric situation, e.g. weather condition, which can be offloaded
from the satellite.BibTeX
I. Dan
u. a., „A 300GHz Quadrature Down-Converter S-MMIC for Future Terahertz Communication“, in
2019 IEEE International Conference on Microwaves, Antennas, Communications and Electronic Systems (COMCAS), 2019, S. 1–6. doi:
10.1109/COMCAS44984.2019.8958300.
Zusammenfassung
This paper presents a highly broadband quadrature down-converter with a center frequency of 300GHz and a low-noise amplifier (LNA) with a bandwidth of 80GHz. The operation frequency between 235GHz and 315GHz enables the usage in future wireless high data rate applications. The submillimeter-wave monolithic integrated circuits (S-MMICs) are realized using a 35nm metamorphic high electron mobility transistor (mHEMT) technology based on InAlAs/InGaAs. The down-converter integrates a frequency multiplier by four, a buffer amplifier and a passive fundamental I/Q mixer and reaches a conversion gain of -15dB and an RF bandwidth of 60GHz. The low-noise amplifier has an average gain of 26dB over the 3dB bandwidth. A total conversion gain of the receiver of 11dB is therefore reached by combining the down-converter and the LNA.BibTeX
C. M. Grotsch, B. Schoch, S. Wagner, und I. Kallfass, „A Highly Linear FMCW Radar Chipset in H-Band with 50 GHz Bandwidth“, in
2019 IEEE MTT-S International Microwave Symposium (IMS), 2019, S. 646–649. doi:
10.1109/MWSYM.2019.8700906.
Zusammenfassung
In this paper we present a transmit and receive MMIC for FMCW radar. The transmitter consisting of a frequency multiplier-by-three and a power amplifier featuring a high output power of 7 dBm with a 60 GHz 3-dB RF-bandwidth. The receiver is designed to be highly linear over a LO and RF bandwidth from 235 to 285 GHz. It employs a frequency tripler and a power amplifier as driver stage for a passive I/Q downconverter which enables an image reject architecture. To ensure linear operation and improve the overall receiver noise an input amplifier stage with an input referred 1-dB compression point exceeding -3 dBm is also integrated. The chipset is realized in a 35 nm metamorphic high electron mobility transistor technology.BibTeX
S. M. Dilek, B. Schoch, und I. Kallfass, „Performance Analysis of Real-Time Full-Duplex E-band Link“, in
2019 49th European Microwave Conference (EuMC), 2019, S. 976–979. doi:
10.23919/EuMC.2019.8910936.
Zusammenfassung
In this paper, a performance analysis of a full-duplex E-band link is reported. The transmission system is operated with a real-time capable modem as a digital signal processing unit with broadband mixed-signal blocks. The measurement has been done with a 1.425 gigabaud-per-second data rate transmission for higher order modulations. A raised-cosine pulse-shaping filter is used with a 0.5 roll-off factor. A residual bit-error-rate which is below the forward-error correction limit is measured. The uplink (81–86 GHz band) transceiver and the downlink (71–76 GHz band) transceiver of the E-band duplex-link provide a 64-QAM transmission which has a 7.5 gigabit-per-second data-rate with a back-to-back configured setup. The 32-QAM and the 16-QAM which provide 6.2 and 5 gigabit-per-second data transmission, respectively are analyzed as well. The paper analyzes the influence of the main analog front-end impairments, noise and amplifier compression, including a real-time capable modem sensitivity over the entire full-duplex E-band communication system performance, i.e. their upper and lower threshold limit for the received power, for different modulation formats and relates these limits to the power compression of the analog frontend's transfer characteristics.BibTeX
B. Schoch, A. Tessmann, A. Leuther, S. Wagner, und I. Kallfass, „260 GHz Broadband Power Amplifier MMIC“, in
2019 12th German Microwave Conference (GeMiC), 2019, S. 232–235. doi:
10.23919/GEMIC.2019.8698140.
Zusammenfassung
This paper presents a broadband H-Band (220-325 GHz) power amplifier in a 35nm InGaAs-based metamorphic high electron mobility transistor technology. The amplifier is realized as a submillimeter-wave monolithic integrated circuit and is designed to drive a high power amplifier in a multi-gigabit communication system or to be implemented in a wideband millimeter-wave radar to detect imperfections in materials. A five-stage amplifier S-MMIC based on common-source gain cells was realized and measured on-wafer with a maximum gain of 14.7dB at 245 GHz. The 3-dB-bandwidth is from 238 to 292 GHz with a gain variation of around 2dB. The amplifier has four parallel transistors in the last two stages and provides up to 4 dBm of output power, under 1dB gain compression. A saturated output power of 6.7 dBm at 280GHz could be measured.BibTeX
B. Schoch, A. Tessmann, A. Leuther, S. Wagner, und I. Kallfass, „300 GHz broadband power amplifier with 508 GHz gain-bandwidth product and 8 dBm output power“, in
2019 IEEE MTT-S International Microwave Symposium (IMS), 2019, S. 1249–1252. doi:
10.1109/MWSYM.2019.8700754.
Zusammenfassung
This paper presents a broadband H-band (220 -325 GHz) power amplifier in a 35 nm InGaAs-based metamorphic high electron mobility transistor technology. The amplifier is realized as a submillimeter-wave monolithic integrated circuit (S-MMIC) and is designed to drive a high power amplifier in a multi-gigabit communication system. The five-stage amplifier S-MMIC based on common-source gain cells was realized and measured on-wafer with a maximum gain of 23 dB at 285 GHz. The lower and higher cutoff frequency is 278 and 335 GHz, respectively, with a gain variation of around 4 dB. The amplifier has four parallel transistors in the last two stages and provides a saturated output power of 8 dBm at 300 GHz. A gain-bandwidth product (GBW) of 508 GHz could be achieved.BibTeX