3. EXPERIMENTAL RESULTS
Figure 3 shows a photo of the fabricated antenna. The simulated and measured reflection coefficients
of our fabricated antenna are shown in Fig. 4. We can see that the impedance bandwidth is over 38%,
which covers the whole GNSS band. For a typical application, the radiation patterns at three center
frequencies of Beidou receive system are shown in Fig. 5. It can be seen that the measured RHCP gains
are higher than 7.4 dB, the cross polarizations are lower than −16 dB, and the backlobe levels of the
RHCP patterns are lower than −25 dB. Meanwhile, the measured results are in good agreement with
the simulated ones, which verify the feasibility of this design.