Final Report of BeJamDetect Project

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4. Demonstrator 2

4.1. Hardware used

Demonstrator 2 makes use of a 4-element antenna array with the arrangement of the antennas in
a 2-by-2 grid as shown in Figure 4-1. Because the multi-antenna RF-front-end used by the
demonstrator supports only the operation on a single frequency, an L1/E1 antenna array developed
in past projects was chosen for the use with the demonstrator.

Figure 4-1: Antenna array used by Demonstrator 2

The frequency response of a single antenna element of the array is shown in Figure 4-2. The
reception characteristics of the array elements have been measured in a free-space test range, the
corresponding diagrams are shown in Figure 4-3.

a

—— RHCP
„-.= LHCP

10

„15

=

„2

band of
interest

Gm

25

30 |

3540

40 +—- ; m x X
„40 1.45 1.50 1.55 160 165 1.70 1.75 1.80
Frequency (GHz)
"igure 4-2: Frequency response of a single array element for a signal arriving from zenith

Title: Final Report
Version: 1.0

age: 38