Chair of Microwave Engineering

antenna arrays

Theme of the project is the development and optimization of antenna arrays. These are used in various areas of radio frequency technology such as communication antennas or radar and measuring instruments. In particular, under this project investigated the noise characteristics of antenna arrays.
An optimization with respect to small noise figures and a possible "sharp" antenna characteristic is the goal. Especially at higher frequencies can be constructed by using antenna arrays with so-called "quasi-optical" systems that are used instead of a distribution network, the directivity of the antenna arrays used.

The project is currently still in the construction phase. First experiments with a modular Verstärker-/Antennensystem have already been carried out.

Frontansicht Antennenarray
Figure.1: Front View of Antenna Array

It is operated at a frequency of 8.4 GHz and is used in the first test runs for optimization of antenna parameters and feed phases.

Using a specially designed rotating antenna system (consisting of a turntable and various ISEL on the HPIB bus controllable measurement components), the polar pattern of the antenna are detected.

Antennendrehsystem mit aufmontiertem Antennenarray
Figure.2: Rotating Antenna System With Mounted Antenna Array

The control and evaluation is done using a PC and an application written in Borland-C++ interface.

Auswertungsoberfläche am PC
Figure.3: AEvaluation of Interface on the PC

Thus, for example, the directional characteristics of the present record above antenna arrays.

Richtcharakteristik eines 4x4 Dipol Arrays
Abb.4: Directivity of a 4x4 Array Dipole

Further steps go there, a transition toward creating in microstrip technology built, multi-layer antenna arrays, while on the way to accomplish the leap to much higher frequencies. It will be created low-noise amplifiers in the millimeter-wave range as well as mixers and frequency multipliers.

 



Contact
Dr.-Ing. Frank Daschner
Phone: 0431 / 880-6169
E-mail: fd@tf.uni-kiel.de
 

If interested in publications or other information materials for this project please contact the secretary or to the persons indicated above.