A microprocessor controlled programmable switching module for phased array applications

Sanyal, Shankha; Goswami, Adrijit; Поддар, Д. Р.; Chowdhury, Souradeep

doi:10.1109/5.4451

Cited by 4 publications

(5 citation statements)

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“…In this paper, we have conceptualized this by considering an auxiliary linear array of 9 element with inter-element spacing d = 0.71. Microcontroller controlled delay matrix [12] steers the resultant beam in the direction of arrival (DOA) of the unwanted signal and is referred here as cancellation beam. By adaptively steering the cancellation beam null is produced in the direction of undesired signal.…”

Section: Concept For Interference Rejectionmentioning

confidence: 99%

A Novel Wideband Subarray Technique for Shaped Pattern Generation and Adaptively Interference Rejection

Alfred

Chakravarty

Singh

et al. 2008

Int J Infrared Milli Waves

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In this article, a simple and efficient technique for the wideband shaped beam and sector beam pattern generation with their adaptive interference rejection is proposed. A microcontroller controlled and time delay based beam forming network for simultaneously generating multiple beams, shaped beam and sector beam is conceptualized. The antenna patterns considered here is formed by linear array of isotropic elements grouped as subarray. The shaped and sector beam synthesis procedure is practically simplified by simultaneous adding the constituents beams from the subarrays, was theoretically established by Woodward and Lawson (Proc. IEE. 95(1): [362][363][364][365][366][367][368][369][370] 1948). Apart from the shaped beam generation a technique for adaptive interference rejection in shaped patterns using combination of time delay and phase shifter is discussed. This topic promises good prospect for wideband pattern generation and interference rejection.

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Section: Concept For Interference Rejectionmentioning

confidence: 99%

A Novel Wideband Subarray Technique for Shaped Pattern Generation and Adaptively Interference Rejection

Alfred

Chakravarty

Singh

et al. 2008

Int J Infrared Milli Waves

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show abstract

“…For example, microcontroller sets the switching pat-tern as A 0 = 0, A 1 = 1, A 2 = 0 and B 0 = 0, B 1 = 0, B 2 = 1, then inter-element differential delay or delay gradient becomes +2 T. Among 64 possible combinations only seven (7) are useful as the other combinations are either redundant or they do not conform the condition mentioned previously. Let, A 0 = 0, A 1 = 0, A 2 = 1 and B 0 = 0, B 1 = 1, B 2 = 0 or phase gradient π 6 T     and inter-element distance 2…”

Section: Time-delayed Matrix At Antenna Levelmentioning

confidence: 99%

“…This is due to the fact that phase shifters introduce nearly identical phase shift for other frequency of operation also, whereas the requirement is that of having a relative phase shift value proportional to the change in frequency. This problem is overcome by use true time delays instead of phase shifters [7][8][9][10]. Moreover, in the rapidly evolving wireless communication systems there is a growing need for imple-menting a phased array system which is capable of adjusting beam tilt angle, pattern shape and interference suppression preferably over multiple contiguous frequency band of operations at low cost overheads.…”

Section: Introductionmentioning

confidence: 99%

Overlapped Subarray Architecture of an Wideband Phased Array Antenna with Interference Suppression Capability

Alfred¹,

Chakravarty²,

Sanyal³

2013

JEMAA

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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.

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“…A Generic delay matrix for systematic delay gradient (+/−) like T, 2T, 3T, 4T etc. can be achieved through proper switching algorithm which is programmable by microcontroller or PC [4]. Rapid switching can be obtained by PIN switches.…”

Section: Introductionmentioning

confidence: 99%

A Novel Implementation Technique of Conical Scan Radar Using A Programmable Phased Array

Alfred

Chakravarty

Singh

et al. 2007

Int J Infrared Milli Waves

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In radar, planar phased array antenna plays vital role in electronic scanning in the azimuth and elevation direction to the horizon. In most operations using planar phased array both the coordinates of azimuth and elevation, are steered electronically. In this paper a conceptual schematic of a phased array antenna with programmable time delay units has been presented. It is shown that by suitably exploiting the time delay matrix one can have electronic beam rotation around the target axis as required in conical scan. Thus both the elevation and azimuth motors in conical scan system are replaced by electronic scanning. Heuristically, we have selected eight consecutive points for beam rotation in a polygon shape and can also be extended almost circular shape by increasing number of array elements and phase shifter (delays) in the delay matrix. The array requires dual control of phase gradient and individual phase values. The whole array is controlled by microcontroller. This presents exciting possibilities in radar operation.

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A microprocessor controlled programmable switching module for phased array applications

Cited by 4 publications

References 0 publications

A Novel Wideband Subarray Technique for Shaped Pattern Generation and Adaptively Interference Rejection

A Novel Wideband Subarray Technique for Shaped Pattern Generation and Adaptively Interference Rejection

Overlapped Subarray Architecture of an Wideband Phased Array Antenna with Interference Suppression Capability

A Novel Implementation Technique of Conical Scan Radar Using A Programmable Phased Array

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