QUESTION

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How to connect a crossed dipole antenna using micro-strip line?
I need help in designing a crossed dipole antenna at 435Mhz using microstrip lines for my interest. Currently, my reference is Gomspace ANT430. However, I am not sure how to calculate the antenna impedance, and how does it related to the microstrip line? Why is there a 90 degrees phase shift? How does the input signal look like with a single dipole and a crossed dipole without phase adjustment? How to adjust the phase factor and what do I need to look out for? Thank you for your help.

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