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axial-mode helical antenna at 1.2 GHz

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Hello everyone
I am designing an axial-mode helical antenna at 1.2 GHz using CST Studio Suite. However, I struggle to achieve the desired S11 (return loss) value. The performance is not as expected despite adjusting parameters such as the number of turns, pitch angle, and ground plane size.

What factors should I focus on to improve the impedance matching and optimize the antenna’s performance? Any guidance or recommendations would be greatly appreciated
 
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What's your target impedance. According to Balanis, dedicated impedance matching is required to match the "natural" 100-200 ohm axial mode input impedance to 50 ohms. Detailed discussion of axial mode helical in chapter 10.
 
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FvM said:
What's your target impedance. According to Balanis, dedicated impedance matching is required to match the "natural" 100-200 ohm axial mode input impedance to 50 ohms. Detailed discussion of axial mode helical in chapter 10.
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The target impedance is 50 ohms.
 
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Axial mode helix antennas usually are fed by a copper strip with triangle shape, making the transition to helix very gradual, matching in this way the 100-200 ohms antenna impedance to 50 ohms. The best way finding the dimensions of the triangle is to use a network analyzer.
 
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I have attached the CST file for the antenna with matching impedance. What should I change to achieve 1.2 GHz?
 

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