The electromagnetic interface is a key-aspect of modern wireless systems. It encompasses all that connects the digital domain to the received and transmitted EM-waves. Research of the Advanced Antennas and Circuits Group is focused on three main areas: “communication”, “identification”, and “sensing”, and covers everything from antennas, circuit/system design, to related signal processing. Emphasis is put on the integration of modules to their surroundings, on adaptive and reconfigurable solutions, and their implementation by advanced and nonconventional technologies. Whether the goal is a novel antenna or a complete RF system design, the team has the required know-how up to frequencies in the millimeter wave range.
- UHF RFID ranging concepts which can be used with unmodified EPC Gen2 tags
Investigations were based on a patent of TU Vienna. The concepts constituted of RF system design/simulations, signal processing, a real-time FPGA-based demonstrator, and the development of custom silicon for a UHF tag with enhanced ranging capabilities. The project was carried out with several industrial partners including a major UHF tag manufacturer.
- Switched mode RF power amplifiers with high efficiency
The research included novel design methodology for digitally driven amplifiers, PWM noise shaping, signal processing for 1-bit systems, nonlinear characterization and linearization of systems with quantized input signals.
- Novel technologies for microwave links, 2011-13, TESLA Holding, Czech Republic
In the project, attention was turned to the research of wireless communication modules operating in frequency bands 38 GHz, and 75 GHz / 85 GHz. Research resulted in the methodology of the design of appropriate antennas and high-frequency circuits.
- Contactless measurement system for the grain angle in timber
This X-band based system utilizes the anisotropic properties of timber and was developed in close cooperation with the leading wood scanning system provider Microtec GmbH Srl (Italy). It included the entire RF/mixed-signal/FPGA co-design design, implementation, and characterization of the high speed measurement-system with multiple antennas. Furthermore, the underlying theory necessary to calculate the dielectric tensor in wood, based on transmission measurements in multiple directions, were studied.
- High-power transmit antennas for DVB-H and DVB-T
TESLA Holding succeeded in a tender for the construction of DVB-H and DVB-T networks in Poland. For this network, modular antennas designed for analog broadcasting had to be redesigned to meet requirements of digital standards. The BUT team created numerical models of high-power transmit antennas and optimized the design from the viewpoint of electrical parameters, mechanical properties, reliability and robustness. Optimized numerical models were used for tolerance and sensitivity analyses resulting to a manufacturing documentation. Designed antennas were introduced to series production and were installed in Poland.
- J. Puskely, M. Pokorný, J. Láčík, Z. Raida, “Wearable disc-like antenna for body centric communications at 61 GHz”, IEEE Antennas and Wireless Propagation Letters, vol. 14, 2015, pp. 1490-1493. ISSN: 1536-1225. DOI: 10.1109/LAWP.2014.2367812
- Raida, Z.; Čáp, A.; Polívka, M. (BUT / Czech UT in Prague), “Multi-band patch antenna.”, Patent no 299752, Prague, 2008; An original methodology of creating multiband planar antennas by etching notches into the antenna element was patented.
- Harmonic load-pull setup Maury ATS
Performing load-pull-measurements is often key to deal with nonlinear effects in active devices. The state-of-the-art 18 GHz high power Maury system is extended with in-house developed active loads.
- Network analyzers Keysight PNA-X and R&S ZVA
Linear and non-linear analysis up to 70 GHz and 110 GHz, resp., for the measurement of circuits, systems, and antennas. Pulse modulation capabilities and fast CW-measurements up to 70 GHz enable analysis of time-variant effects.
- Spherical antenna measurement systems NSI 700S-30 and NSI 700S-90E
The scanners, both installed in an anechoic chambers, are able to measure radiation properties of antennas and systems. In total, the frequency range is from 800 MHz up to 50 GHz in the near-field range, and up to 110 GHz in the far-field range.
- Polytechnic University of Catalonia (Spain)
The cooperation is focused on the development of methodology for the design of filtering antennas (filtennas) composed from a patch array, substrate integrated resonators, and substrate integrated feeders.
- Holon Institute of Technology (Israel)
At present, we prepare a research project focused on the development of intelligent textile materials to be used as a wireless feed and wireless communicator with sensors of vital functions. Partner companies in the project plan to use the intelligent textile as a cover of mattresses in hospital beds.
- Volkswagen AG, Germany
The former cooperation was focused on the development antenna concepts for Car2Car communication and antennas for positioning, data fusion algorithms. Now, we cooperate in the development of the methodology for an in-car electromagnetic field modeling.