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.
Steve Bradburn
Senior Antenna Engineer at Antenova With over 25 years’ experience in manufacturing, test and design, Steve has a wealth of RF and measurement knowledge across many industry sectors.