E-plane scan performance of infinite arrays of dipoles printed on protruding dielectric substrates: coplanar feed line and E-plane metallic wall effects

Bayard, J.; Schaubert, D.H.; Cooley, Michael

doi:10.1109/8.250461

Cited by 25 publications

(10 citation statements)

References 10 publications

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“…Similar to scan blindness due to the SW, scan blindness due to feed is a consequence of the mutual coupling between array elements. Earlier, with respect to the arrays formed by dipole REs [27][28][29], it is shown that optimally high metallic baffles or electric walls (Ewalls), parallel to H-plane, isolate the antenna elements from each other, thus, reducing the mutual coupling in the E-plane.…”

Section: × 7 Gtsa Array Demonstratormentioning

confidence: 99%

Wide band wide scan low cross‐polarised grooved tapered slot antenna array

Kedar

2018

IET Microwaves, Antennas & Propagation

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The present study proposes a new geometry of tapered slot antenna (TSA), called as a grooved TSA (GTSA). The antenna is designed to operate in L-band for phased array applications. The topology of TSA's fins is modified by introducing electrically thin grooves, which split fins into separate sections, electromagnetically coupled to each other. The motive behind this modification is to reduce high cross-polarisation (x-pol) level in the radiation pattern of TSAs by altering the flow of surface currents intelligently. The design and optimisation are done using commercial FEM solver, HFSS. Furthermore, an embedded performance of GTSA in 7 × 7 elements array is presented. The mutual coupling between the array elements is minimised by the introduction of metallic baffles parallel to H-plane. GTSA demonstrates a fractional bandwidth of 0.58 illustrating a reflection coefficient <−10 dB, half power beam width not less than 120° and 90° in E-and H-planes, respectively. It demonstrates an xpol level <−20 dB at the extreme scan angles (up to 60°) from the broad side. The GTSA array demonstrates a wide scan performance up to 60° from the broad side. The present work is extremely useful in the realisation of active-phased array radars.

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Section: × 7 Gtsa Array Demonstratormentioning

confidence: 99%

Wide band wide scan low cross‐polarised grooved tapered slot antenna array

Kedar

2018

IET Microwaves, Antennas & Propagation

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“…The literature on unconnected arrays contains references [ Bayard et al , 1993; Hansen , 1998; Munk , 2003] that associate common‐mode currents on feeding transmission lines with deleterious effects, such as reduction in power transfer in certain beam directions, a phenomenon often referred to as scan blindness. This led to the hypothesis that such currents may also be associated with the computed efficiency reductions in the dual‐polarized connected array.…”

Section: Effects and Structure Of Common‐mode Currentsmentioning

confidence: 99%

Analysis of common‐mode effects in a dual‐polarized planar connected‐array antenna

Hay

O’Sullivan

2008

Radio Science

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[1] An analysis is presented of the efficiency of a dual-polarized planar connected-array antenna, with particular reference to possible use in wideband focal-plane-array applications. The modeling approach is described, and the results of different numerical techniques are compared. The analysis includes the effects of transmission lines used to load the array at a groundplane. Different types of loading are compared including optimum single-ended loading and optimum differential-mode loading with short-circuit and open-circuit common-mode terminations. The results indicate that high efficiency over useful bandwidths should be possible. In the case of differential-mode loading, the efficiency may be reduced at certain frequencies due to resonances of common-mode currents on the transmission lines. The current distributions on the array are analysed, and observations are made which may be useful for modified designs.

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“…However, they exhibit ruinous common-modes when implemented in a phased array that scans to low angles. The balanced antennas in [11], [12], [13], [14] all exposed the occurrence of common modes in their feeds, which caused efficiencydisastrous resonances. These common modes are present at frequencies and scan angles (typically mid-band and >45 • ) where mutual coupling between co-polarized array elements introduces a phase imbalance on the feed [15], [16].…”

Section: Introductionmentioning

confidence: 99%

“…It is for this reason that most TCDA designs include integrated balun (TCDA-IB) [17], which would require a second (and unnecessary) balun in the aforementioned balanced system configuration. Aside from simply using a balun feed, other work have investigated disrupting the coupled fields through conductive [11], [12], [18], [19], [8] or lossy means [13]- [14].…”

Section: Introductionmentioning

confidence: 99%

Optimized Differential TCDA (D-TCDA) With Novel Differential Feed Structure

Johnson

Manohar

Venkatakrishnan

et al. 2021

IEEE Open J. Antennas Propag.

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Today's phased arrays require large instantaneous bandwidths, wide fields of view, and low profiles to conduct multiple functions. Many of these phased arrays rely on emerging high speed ADCs and advanced balanced transceivers. The benefits of balanced front-ends include improved linearity, dynamic range, isolation, and noise resilience. The application of a differential phased array in such a system removes extraneous losses caused by baluns, though the issue of feed-borne E-plane scan resonances must be considered. We address the E-plane scan resonance issue through an improved Balanced Wideband Impedance Transformer (BWIT) feed for the ultra-wideband (UWB) Tightly Coupled Dipole Array (TCDA). This BWIT feed has already demonstrated mitigated common-modes over a 3:1 bandwidth ratio while scanning to low angles. Here, our differential TCDA (D-TCDA) is developed for the L-C band (viz. 1.0 GHz to 6.1 GHz) with emphasis on resonance-free wide-angle scanning. Rigorous EM model and circuit analysis is included to verify the BWIT's performance. Under a VSWR < 3 definition, the improved array achieves a 6:1 impedance bandwidth ratio (BWR) with resonance-free scanning in all planes. An exception is the H-plane scanning at 60 • where the VSWR < 4. Array simulations are verified with measurements for an 8×8 single-polarized prototype.

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E-plane scan performance of infinite arrays of dipoles printed on protruding dielectric substrates: coplanar feed line and E-plane metallic wall effects

Cited by 25 publications

References 10 publications

Wide band wide scan low cross‐polarised grooved tapered slot antenna array

Wide band wide scan low cross‐polarised grooved tapered slot antenna array

Analysis of common‐mode effects in a dual‐polarized planar connected‐array antenna

Optimized Differential TCDA (D-TCDA) With Novel Differential Feed Structure

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