Coplanar Side-Fed Tightly Coupled Ultra-Wideband Array for Polar Ice Sounding

Li, Linfeng; Yan, Jiahao; O’Neill, Charles; Simpson, Christopher D.; Gogineni, Prasad

doi:10.1109/tap.2021.3138544

Cited by 6 publications

(3 citation statements)

References 20 publications

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“…Figure 2 shows the AR curve of Reference Element I during broadside and xz-plane/D-plane scanning. When the antenna is scanned, unbalanced pushpull current and common mode resonance may appear, resulting in deterioration of low-frequency AR [15]. It can be seen that the introduction of the tightly coupled environment (that is, the grounded coupling patch) mitigates the low-frequency AR bandwidth limitation.…”

Section: A Cp-tcda Element Arranged Along the Grid Directionmentioning

confidence: 99%

“…In order to improve the scanning bandwidth of TCDA antennas, one important aspect is to suppress the in-band common mode resonance; for example, by using a TCDA antenna with integrated balun [12], or planar ultrawideband modular antennas based on shorted via [13] or capacitively loaded via [14]. However, most reported TCDA antennas worked with linear polarization or dual linear polarization (DP) [12][13][14][15][16][17], and few papers deal with CP-TCDA antenna. A 4 × 4 CP tightly coupled crossed dipole array antenna was designed in [18].…”

Section: Introductionmentioning

confidence: 99%

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A Wideband Scanning Circularly Polarized Array Antenna Based on the Shorted Transmission Line Model

et al. 2022

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Due to the huge potential of application in the communications, electronic jamming, and radar fields, circularly polarized (CP) array antennas with wide axial ratio (AR) scanning performance at wide frequency bandwidth have received great attention. A wideband scanning CP planar array antenna built by new, tightly coupled dipole array (CP-TCDA) elements, which have achieved promising results in terms of both scanning AR bandwidth and angle range in all scanning planes, is presented in this paper. Based on the shorted transmission line model, a CP-TCDA element arranged along the ±45° direction is constructed, which can shift the middle-frequency scanning blind zone out of band and thus obtain a wideband scanning AR bandwidth. Furthermore, the proposed CP-TCDA element adopts four shorting pins and four square parasitic strips, which improve wide-angle CP performance for xz-plane and diagonal-plane scans, respectively. An 8×8 left-handed CP planar array antenna based on the proposed CP-TCDA elements is designed and prototyped. The results show that the array antenna is able to operate over a 3:1 (4-12 GHz) overlapping bandwidth, and it meets the requirements of AR < 3 dB and active VSWR < 2.9 within a ±45° scanning angle range.INDEX TERMS array antenna, circularly polarized, phased antenna, scanning antennas

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Section: A Cp-tcda Element Arranged Along the Grid Directionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A Wideband Scanning Circularly Polarized Array Antenna Based on the Shorted Transmission Line Model

et al. 2022

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“…It is also a good candidate to conceive wideband high-gain antenna systems when associated with artificial magnetic conductors [17,18]. Moreover, recently the bow-tie has also been used in beamsteerable [19,20] and wideband arrays [21]. However, the bow-tie geometry must be carefully selected if a required gain has to be maintained towards a specific direction over a whole range of frequencies of interest.…”

Section: Introductionmentioning

confidence: 99%

The bow‐tie antenna: Performance limitations and improvements

Mello

Lepage

Begaud

2022

IET Microwaves Antenna & Prop

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The simple planar shape and wideband input impedance of the bow‐tie antenna make it suitable to diverse wideband applications. However, the radiation pattern of this kind of antenna is not stable and the gain in the broadside direction deteriorates with increasing frequencies. In this article, the operation of both the triangular and the rounded‐edge versions of the bow‐tie antenna is thoroughly investigated and the performance thereof is compared. A technique to maximise such performance, which consists of inserting radially aligned grooves in the radiators' ends, is presented. The bandwidth, defined by a broadside gain of at least 2 dBi and a reflection coefficient magnitude of less than −10 dB, is improved from 85.7% to 97.9% in simulations. Such an improvement is validated through the measurement of two prototypes, in which the presented technique also increases the broadside gain in up to 1.5 dB, with no significant change in the shapes of the radiation patterns and in the reflection coefficient magnitude.

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Tightly coupled arrays with time-domain beam scan for the radiation of high-power ultrawideband electromagnetic pulses

Wang,

Zhu,

Tang

et al. 2023

Review of Scientific Instruments

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In this paper, a kind of tightly coupled array (TCA) with time-domain beam scan is developed for the radiation of high-power ultrawideband (UWB) electromagnetic pulses, and the peak-power pattern is proposed to characterize the directivity. First, the active voltage standing wave ratio (AVSWR) bandwidth of the TCA is optimized, which is the precondition for the beam scan. It indicates that the lower-cutoff frequency (LCF) is inversely proportional to the total length of the whole array; an increase in the distance between the array and the ground plane could remarkably reduce the LCF; and an increase in the element number can also decrease the LCF because of the increase in length, but more elements would make the center elements difficult to match in the low-frequency range, so there is a limitation on the number of elements for a certain LCF. Based on these results, a six-element linear array is designed. Then, the definition of the peak-power pattern is proposed to characterize the directivity of the UWB pulsed antenna. Finally, the optimized six-element array is developed, and the measured working band is 276 MHz–6.4 GHz (AVSWR < 3). The effective potential gain is 1.76, and it improves by 51.7% with a reduction in the aperture area by 68.4% compared with the previous TCA, which means that the aperture efficiency is remarkably improved. The half-power beam width of the developed TCA with the scan angle of 0° is 45°. The time-domain beam scan could be performed with time-delay feeding lines, and the maximum scan angle is over ±30° in the E-plane. The developed TCA can be applied for the generation of high-power electromagnetic environments for the study of intentional electromagnetic interference.

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Coplanar Side-Fed Tightly Coupled Ultra-Wideband Array for Polar Ice Sounding

Cited by 6 publications

References 20 publications

A Wideband Scanning Circularly Polarized Array Antenna Based on the Shorted Transmission Line Model

A Wideband Scanning Circularly Polarized Array Antenna Based on the Shorted Transmission Line Model

The bow‐tie antenna: Performance limitations and improvements

Tightly coupled arrays with time-domain beam scan for the radiation of high-power ultrawideband electromagnetic pulses

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