Electromagnetic theory; Numerical simulations of electromagnetic fields via parallel FDTD code; Supercomputer facility for solving large problems, with 960 CPUs and approx. 4.5 TB RAM; Electromagnetic compatibility.
APNet's Research areas
The area concerns the interaction between electromagnetic fields from mobile phones and base stations with biological tissue. The group has been active mainly in dosimetry (how much is absorbed), design of experimental situations in collaboration with the medical community, and distribution of energy in indoor environments. Active in COST Action BM0704 entitled ‘Emerging EMF Technologies: Health Risk Management ‘ (The link to the website is www.cost-action-bm0704.org ) and other EU projects, like SEAWIND , “Sound exposure and risk assessment of wireless network devices” (www.seawind-fp7.eu ).
The group has focused on small antennas and antenna systems mainly for mobile terminals. It all started back in 1993 with the first internal antenna for a mobile phone, which featured not only integration into the phone but also focused the radiation away from the human user, which resulted in a very low amount of power into the head of the user. The antenna solution had a SAR value 10 times lower than any other phone. The antenna was patented and transferred to a company in the region, Cetelco A/S. A year later they launched the first ever mobile phone with an internal antenna.
Later on antenna solutions such as the first dual-band, the first tri-band antenna with low SAR and highest radiation efficiency (1999), and the most efficient antenna diversity system has been the outcome of our research. Lately very small and very efficient tunable antennas have been studied as well as UWB antennas for body worn devices and highly integrated antennas for wind turbine blades.
For more than 25 years APNet has a been involved in radio propagation research developing theory and knowledge based on extensive measurement facilities. Typical activities include measurement and modeling of radio channels used for mobile devices, often small devices such as smart-phones, radio sensors, but also larger devices. A focus area is the user's influence on the characteristics of the channel.
Both single antenna and multiple-antenna (MIMO) systems are studied, with applications within cellular systems, vehicle to vehicle communications, indoor networks (e.g. WiFi), device (machine) to device (machine) communications, and body-worn devices.
Reliable Radio Networking
The group features a broad expertise in designing protocols and system level solutions for wireless networks for different applications: wireless cellular networks, WiFi, Machine-to-Machine (M2M) communication, wireless sensor networks, RFID systems, cognitive radio and wireless transmission in the white spaces, etc. Besides the expertise for transmission techniques and communication protocol design, the group has a unique approach in analyzing the existing wireless systems and devising protocol modifications for increasing the system reliability, without changing the physical layer, the RF frontend, or the antennas.
Emphasis on MIMO communications with a massive number of antennas at the base stations or,
at millimeter waves, at note base station and user device.
Activities: Channel measurements, CSI acquisition, Beamforming, Protocols.