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Design of a miniature ultra-wideband antenna under ANSYS HFSS

Design of a miniature ultra-wideband antenna under ANSYS HFSS

Ultra-wideband antennas are designed for use over a wide frequency range. They are often used to pick up signals from different sources without the need to change antennas. These antennas are an ideal choice for various applications such as medical imaging, telecommunications, the Internet of Things, detection, etc.
It is also important to reduce the dimensions of the antennas as much as possible in order to facilitate their integration into complex devices. This reduction is a complex challenge in the antenna design process.
This subject presents the design and development of a miniature broadband spiral cavity antenna. This antenna represents an improvement on existing work in terms of compactness and low frequency of use. Using the advanced features of Ansys HFSS, we were able to design and optimise the antenna and the feed balun.

The model antenna is a double spiral with a diameter of 14.5 cm. The feed balun (not visible here) is integrated into the cavity. The cavity is designed to eliminate back radiation, which can be problematic for antenna integration.
We studied the antenna matching (Figure 2) to find out its operating frequency range.

Figure 1. Model antenna

The model antenna is a double spiral with a diameter of 14.5 cm. The feed balun (not visible here) is integrated into the cavity. The cavity is designed to eliminate back radiation, which can be problematic for antenna integration.
We studied the antenna matching (Figure 2) to find out its operating frequency range.

Figure 2. Antenna adaptation: antenna operating frequency

We can see that the antenna works from 330 MHz up to 1.5 GHz.
Next, we look at the antenna’s radiation pattern. In 3D and polar.

Figure 3. Antenna radiation pattern

We can see that the antenna is directional and that the back radiation is strongly attenuated.
Finally, we study the axial ratio to ensure that the circular polarisation of this antenna is pure :

Figure 4. Axial ratio: checking circular polarisation

This antenna is circularly polarised from 340 MHz.
Finally, we have designed a circularly polarised spiral cavity antenna that operates from 350 MHz and measures 14.5 cm in diameter.

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