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Practical as well as theoretical aspects of medical microwave imaging require short antennas with short impulse response function for transmission and reception of the sounding fields. Since usually antenna design goals are targeted to good feed point matching, one runs into unsolvable problems in case of wideband measurements. The paper will introduce a radar channel model based on electrically short...
An integrated, completely balanced broadband transceiver front end for operation in the cm- and mm-wave range is presented. It is compatible with our ultra-wideband M-sequence baseband system. The transceiver front end is based on the application of specific integrated circuits (ASICs) designed for a 0.25 μm SiGe process with fT/fmax = 180/220 GHz. To achieve an optimum reasonable...
Ultra-wideband sensors are a useful tool for short-range monitoring of people. Their high resolution enables supervision of vitality aspects such as movement, body posture, or even breathing activity. For practical applications outside the lab, other system features besides bandwidth become essential. This paper discusses such features and introduces a sensor network concept that is tailored for use...
The article deals with SiGe based hardware for new, flexible ultra-wideband MIMO sensing purposes using pn-sequence approach. Introduced hardware serves as future platform for scientific investigations in the complex field of ultrawideband (UWB) applications. We discuss the design aspects and prototype evaluation of the single chip M-sequence based sensor head as well as realization particularities...
Imaging by microwave UWB radar represents a promising technique for early-stage breast cancer detection. We present an experimental measurement setup for breast phantom trials based on M-sequence radar technology and active small antennas (interfacial dipoles). This approach combines short impulse responses, sufficient fidelity and very small antenna dimensions and allows for array construction with...
A flexible ultra-wideband (UWB) sensor node for operation in the license-free range from 6.0–8.5 GHz is proposed. The sensor is aimed at end-user applications at home. As an example, vitality monitoring of needy people is introduced. UWB sensors deliver information on position, posture, and breathing. Challenges are discussed using real-world data.
Ultra-wideband sensing provides new and interesting options for testing and inspection in many different fields. The article will deal with some applications for civil engineering. The advantage of UWB-sensing is the good penetration of the sounding waves through the material under test and its high spatial resolution. A flexible UWB-sensor conception will be discussed. Its working principle is based...
Random noise radar attracts interest mainly because of its low interference and its camouflaged operation, as well as the relaxed requirements concerning transmitter power. Its challenge for very wideband operation is the impulse compression in order to gain range resolution. The use of pseudo random codes largely defuses this problem while keeping most advantages of random noise radar. Modern semi-conductor...
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