Patent ID: 6819291
Filing Date: 2004-11-16
Classification: H01Q

Abstract:
An eight-element GPS antenna, usable with multi-pattern adaptive processing for anti-jam operation, comprising:a ground plane portion; eight monopole elements positioned above said ground plane portion and arrayed around an axis; and an excitation network coupled to said monopole elements, the excitation network configured to provide output signals representative of each of the following antenna patterns: (i) 45 degree counter-clockwise (CCW) progressive phase excitation of the monopole elements to produce a first circularly-polarized omnidirectional antenna pattern; (ii) 45 degree clockwise (CW) progressive phase excitation of the monopole elements to produce a second circularly polarized omnidirectional antenna pattern; (iii) 90 degree CCW progressive phase (PP) excitation of the monopole elements to produce a 90 degree CCW PP antenna pattern; (iv) 90 degree CW progressive phase excitation of the monopole elements to produce a 90 degree CW PP antenna pattern; (v) 135 degree CCW progressive phase excitation of the monopole elements to produce a 135 degree CCW PP antenna pattern; (vi) 135 degree CW progressive phase excitation of the monopole elements to produce a 135 degree CW PP antenna pattern; (vii) 180 degree progressive phase excitation of the monopole elements to produce an eight-lobe antenna pattern; and (viii) same phase excitation of the monopole elements to produce a uniform phase omnidirectional antenna pattern.