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We design a tapped-delay line (TDL) structured wide-band smart antenna array using vector-space projection (VSP) method. The structure consists of a one-dimensional antenna array with a TDL attached to each antenna. By controlling the weight coefficients at the TDL taps using VSP method, we achieve beamforming the array over wide frequency bands. Constraints and associated projections are furnished to meet the design specifications. We demonstrate the capability of VSP method adapted to solve this array design task. Index Terms--Broad-band operation, smart antenna arrays, tapped-delay line (TDL), vector space projections (VSP).

We use vector space projection (VSP) methods to design wide-band adaptive and self-healing arrays. Rectangular arrays are assumed but the VSP algorithm can be applied to any confirmation. In the VSP method, we formulate a set of design constraints and then iteratively improve on a trial solution by operations known as 'alternating projections.' When all of the constraint sets are convex and the intersection of these sets is not the empty set, we can meet the design specifications in a finite dimensional setting. In our simulations, we show that reasonable design constraints are readily met. We demonstrate that VSP is useful for broad-band self-healing, i.e., the reconfiguration of the array when some broad-band elements fail to operate. Finally we compare our results with a known design procedure for broadband antenna arrays. Index Terms--Broad-band operation, self-healing, smart antenna arrays, vector space projections (VSPs).

We consider the problem of reconfiguring array antennas whose performance has been degraded by the failure of one or more elements. We show that the method of vector-space projections is well suited for this task and enables the recovery of reasonable antenna performance when as many as 30% of the elements are inoperable. Index Terms--Antenna arrays, self-healing arrays, smart antennas, vector-space projections.