Berlin 2015 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 69: GHz Dielectrics - Materials for mobile communication I (DF with HL/MM)

HL 69.2: Talk

Thursday, March 19, 2015, 10:00–10:20, EB 407

Impedance matching for high power transistors based on printed ceramics — •Alex Wiens, Daniel Kienemund, and Rolf Jakoby — Technische Universität Darmstadt, Institut für Mikrowellentechnik und Photonik

The multitude of standards in modern tele-communication systems, such as GSM, UMTS, LTE and WiFi make the hardware of a radio front end face a variety of frequencies and bands. Generally, each element of the front end is optimized to perform best at a certain frequency band and signal type. Power amplifiers can be considered as the most critical components of RF/microwave communication systems, as they dominate the power consumption and hence the efficiency of the whole system. They are therefore consequently the focus of intense research to achieve improved linearity and increased power efficiency. Barium-Strontium-Titanate (BST) varactors offer an alternative to semiconductor and MEMS technologies in the design of tunable matching networks for reconfigurable multi-band RF-power amplifiers, and for load modulation applications, where the varactor tuning is used to maintain high efficiency over a large dynamic range of the input signal. Recent advances in fabrication of high power tunable RF varactors based on BST are presented and discussed. Measurement results of a BST-based tunable matching network, implemented inside a GaN HEM Transistor show promissing performance for telecommuncation frequency range.