Patent ID: 6121936
Filing Date: 2000-09-19
Classification: H01Q

Abstract:
A multi-function antenna assembly, for receiving and transmitting a plurality of RF signals, comprising:a support structure;a first antenna mounted to said support structure, said first antenna comprising a first spiral antenna structure and two shielded stripline transformers for feeding said first spiral antenna structure;a second antenna mounted to said support structure, said second antenna comprising an annular slot antenna structure disposed about a center of said first spiral antenna structure and a microstrip feed network for feeding said annular slot antenna structure; anda third antenna mounted to said support structure, said third antenna comprising a second spiral antenna structure disposed within a center of said annular slot antenna structure and a microstrip balun for feeding said second spiral antenna structure;wherein said first spiral antenna structure, said annular slot antenna structure, and said second spiral antenna structure are substantially coplanar.