Stephan Werker

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In this paper we show that the radiation properties of a shortwave antenna are significantly influenced by a nearby building. The building itself has been used as back reflector for a 2-element vertical Yagi antenna to create a modified corner reflector antenna with optimized pattern and gain for the 14 MHz amateur radio band. This has been done by careful(More)
With this work, we have shown that even high linearity and a low NF can be achieved with extremely low power consumption. The amplifier was optimized for a maximum input power level of -20 dBm. This requires a careful adjustment of the operation point of the transistor in combination with optimized input and output matching networks. With this design an(More)
In this paper we present a classical circularly polarized helix antenna. The axial ratio of this antenna is improved by a new method using a parasitic element. We describe the effectiveness of this element for various shapes and placements. Finally, we demonstrate the results on a six turn helix antenna.
The quality of a communication system is mainly influenced by the sensitivity of the receiver. A critical receiver stage is the first amplifier [low noise amplifier (LNA)] that should have a low noise figure (NF) as well as sufficient gain to provide high sensitivity and also a high dynamic range to avoid intermodulation products from strong signals. The(More)
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