Abstract
This paper presents a novel architecture of combining the linear array of antenna elements, where each antenna element has digitally selectable true time-delays as weights. Use of time-delays for beam-formation inherently makes the phased array network a wideband system. In particular, this technique envisage a new method of sharing antenna elements, by fixed overlapped sub-array architecture, which is able to maintain permissible element spacing to avoid grating lobe in antenna pattern. Moreover, this scheme additionally offers an easier null steering capability to the subarray architecture. This method essentially eliminates the need for intensive computation of complex weight vectors attached to each antenna element.
Highlights
IntroductionAn electronically steered phased array antenna system may be setup with phase shifters connected to each radiating element which in combine, transmits (receives) in directive way
This paper presents a novel architecture of combining the linear array of antenna elements, where each antenna element has digitally selectable true time-delays as weights
An electronically steered phased array antenna system may be setup with phase shifters connected to each radiating element which in combine, transmits in directive way
Summary
An electronically steered phased array antenna system may be setup with phase shifters connected to each radiating element which in combine, transmits (receives) in directive way. The quality of beam shape and angular accuracy worsen with the increase of signal bandwidth, size of aperture and steering angle This is due to the fact that phase shifters introduce nearly identical phase shift for other frequency of operation whereas the requirement is that of having a relative phase shift value proportional to the change in frequency. Fully steerable array using digitally controlled programmable time-delay units with the additional facility of precise null-suppression is prohibitively costly To overcome this problem, the subarray based feeding mechanism using both phase shifters and time-delays were proposed by Mailloux [11]. It is possible to place one (multiple) null(s) in the presence of strong interference by adaptive sidelobe cancellers or by optimizing the complex weight coefficients Though these methods are popular for null formation but require extra hardware, computational resources and cost. The principal objective of the present communication is to provide improved overlapped subarray architecture for the following requirements: To develop wideband phased array system with programmable beam forming capability; To null at the angle of interference
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