Sidelobe Reduction of Substrate Integrated Antenna Arrays at Ka‐Band

An antenna array with low sidelobe levels is applied to reduce the noise and interference from the undesired direction in radar and communication systems. This chapter introduces the techniques of sidelobe reduction for substrate integrated antenna array. The feeding network is the key factor to realize the desired power distribution for sidelobe reduction. Therefore, the state‐of‐the‐art techniques of feeding networks for low sidelobe levels are reviewed and summarized at first. Then the key components of the feeding network, named power dividers, are discussed in detail. After that, two types of series feeding techniques for sidelobe reduction are demonstrated by a small antenna array and a monopulse antenna array at Ka‐band.