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Remote System for Reading Traffic Signs and Information

100%

Janisz K. , Stępień J. , Odrobina S.

International Journal of Electronics and Telecommunications

2018

tom Vol. 64, No. 2

223--228

This paper presents an experimental system for remote communication between road users and traffic signs. Implemented solution consists of two modules: a transmitter (traffic sign), including novel system for remote waking-up by the passing vehicle with use of the quasi-passive (biased) diode detector circuit, and a receiver (vehicle), which is responsible for wake-up signaling and interpreting received messages. Both modules use Wi-Fi protocol operating in 2.4 GHz ISM band for sending data, and OOK signaling in 868 MHZ ISM band for sending wake-up signals. The paper provides theoretical analysis, description of design challenges and chosen solutions, and finally, laboratory measurements as well as the results of tests conducted in the systems’ target environment with a moving vehicle, confirming correct operation of the system.

Wideband Nine-Port Reflectometer

100%

Odrobina S. , Staszek K. , Wincza K. , Gruszczynski S.

tom Vol. 64, No. 1

19--25

The paper presents a wideband nine-port reflectometer realized as a cascade connection of six- and five-port reflectometers. It is shown that such a solution allows for a convenient adjustment of circuits’ parameters in order to provide significantly reduced measurement uncertainty with respect to other reported reflectometers. Simultaneously, the proposed network features a simple and flexible design. For the experimental verification, the proposed nine-port reflectometer has been manufactured and incorporated into the system intended for reflection coefficient measurements within the frequency range 2.5 - 3.5 GHz. The obtained results are in an excellent agreement with the values measured using a commercial VNA.

Serum trypsin inhibitory activity and alpha-1-antitrypsin level in liver diseases

88%

Miszczuk-Jamska B. , Pajdak W. , Barylak H. , Odrobina S. , Sowa J.

nr 2