A linear retro- and reflecto-nulling antenna array with an odd element number

In this paper, retro- and reflecto-nulling antenna array presented in the last year APMC is extended to the case of odd number of array elements. It can yield two nulls at the incident angle and the reflection angle of the incident wave. With the use of 90° hybrids and the proper phase shifters, in order to design a retro- and reflecto-nulling antenna arrays with odd number of elements, a folding method is developed and results of three- and five-element retro- and reflecto-nulling antenna arrays are presented.