UWB antipodal vivaldi antenna for microwave imaging of construction materials and structures

Moosazadeh, Mahdi; Kharkovsky, Sergey; Case, Joseph T.; Samali, Bijan

doi:10.1002/mop.30509

Cited by 23 publications

(13 citation statements)

References 14 publications

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“…At 2 GHz, VSWR decreases toward unity when the opening size is increased from W t = 15 mm ≈ 0.1λ, W t = 35 mm ≈ 0.23λ, to W t = 60 mm ≈ 0.4λ. The literature [10,11] explained that the smaller aperture height profits the wider low end of frequency, which is in contrast to our result that smaller opening of tapered slot increases the VSWR. That difference happens because our antenna is designed with high opening rate R. For resonance at the low-end frequency, the antenna should be designed with tapered slot opening of wider mouth, while antennas with small R can be designed with small W t .…”

Section: Opening Width Of the Tapered Slotcontrasting

confidence: 99%

“…In terms of the design structure, Vivaldi antennas can be divided into three classes, i.e., Coplanar Vivaldi Antenna, Antipodal Vivaldi Antenna (AVA) and Balanced Antipodal Vivaldi Antenna (BAVA), each with its own strengths. For instance, the family of AVA generally shows high gain and wide [10][11][12]. However, the wide bandwidth implies the emergence of grating lobes when the antennas are used in array configuration especially in high frequency region of the band [13].…”

Section: Introductionmentioning

confidence: 99%

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Radiation Pattern Analysis and Modelling of Coplanar Vivaldi Antenna Element for Linear Array Pattern Evaluation

Nurhayati¹,

Setijadi²,

Hendrantoro³

2019

PIER B

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This paper reports an electric field approximation model of the Coplanar Vivaldi antenna on the E-plane. The study is conducted in three stages, i.e., (i) evaluating the impact of various geometrical parameters to the Vivaldi's element performance at different frequencies, (ii) modeling the electric field patterns, and (iii) applying the model to evaluate the linear total array pattern. The examination of the Coplanar Vivaldi element with fractional bandwidth of 133% in the 2-10 GHz band shows the individual roles of the antenna width, the tapered slot length, the opening width and the slope of the tapered slot in determining the VSWR, resistance, reactance and E-Field performance. The Vivaldi element should be designed with element width more than 0.5λ and less than λ to reach better performance of VSWR and E-field. The longer the tapered slot (> λ) with the high value of opening rate of tapered slot, the smaller the E-field. The E-field increases with increasing opening width of the tapered slot. Knowledge of the influence of each geometry parameter is then used as a reference in developing the E-field pattern approximation model of the Vivaldi element. The derivation of the Vivaldi approximation model is started from the pattern of a horn antenna because both antennas share a similar feature, i.e., the enclosure of the E-field propagation within a tapered slot resulting in a directional radiation pattern. The result of Coplanar Vivaldi modeling is verified against the results of electromagnetic computational simulation and measurement. The Vivaldi element model is useful for total array pattern analysis to save computation time and to provide flexibility in the evaluation of array design.

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Section: Opening Width Of the Tapered Slotcontrasting

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Radiation Pattern Analysis and Modelling of Coplanar Vivaldi Antenna Element for Linear Array Pattern Evaluation

Nurhayati¹,

Setijadi²,

Hendrantoro³

2019

PIER B

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“…The additional parameters provide finer controls on HPBW and side lobe level but come at the cost of antenna gain. For example, the baseline model of this study (shown below) has a gain of 10.68 dB, which is better than the antipodal Vivaldi antenna designed by Osman et al [12] (gain of 4.3 dB) or Moosazadeh and colleagues [13,14] (gain of 8.5 dB). It is also better than the Vivaldi antenna designed by Zhang et al [15] (gain of 6.7 dB) or Kerati et al [16] (gain of 8 dB).…”

Section: Introductionmentioning

confidence: 63%

Linear Tapered Slot Antenna for Ultra-Wideband Radar Sensor: Design Consideration and Recommendation

Tseng

Chang

2019

Sensors

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Radar is a type of wireless, noncontact sensor that does not need to be placed on or near a test object for detection. A key component of any radar sensor is the antenna. Among different types of antennas, the linear tapered slot antenna (LTSA) is a wideband antenna that has the advantages of small size, design simplicity, and easy adaptation to an array. This study examined and analyzed the 10 primary parameters that define the LTSA design when operated in the ultra-wideband (UWB) frequency range. The study method involved varying each of the 10 parameters to discern how the variations impact the three critical characteristics of an antenna, namely, (1) return loss, (2) the far field radiation pattern on the E-plane, and (3) the far field radiation pattern on the H-plane. By analyzing the changes in these critical characteristics, a set of design recommendations for the 10 parameters was developed for the LTSA.

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“…Periodic slots with lens enhance the overall performance of AVA. It increases gain, bandwidth, directivity, front to back ratio and reduces sidelobes and dimensions of AVA [57]. Slots with variable capacitors or split-ring resonators are used to design re-configurable AVA for rejecting unwanted bands in [58], [59].…”

Section: Slotsmentioning

confidence: 99%

A Survey of Performance Enhancement Techniques of Antipodal Vivaldi Antenna

2020

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The increasing proliferation of advanced devices for UWB, 5G communication, micrometerwave, and millimeter-wave communication demands an antenna which can handle huge data rates, provides high gain and stable radiation pattern as a panacea of most of the current wireless communication problems. Many different antenna designs have been proposed by the researchers but, Antipodal Vivaldi Antenna (AVA) has drawn the attention of most of the researchers because of its high gain, wide bandwidth, less radiation loss, and stable radiation pattern. Different methods are presented to make AVA more compact while maintaining the performance of an antenna to an acceptable level. These different methods are substrate choice, flare shape, slots, and feeding connectors. Also, AVA performance can be enhanced by incorporating corrugation, dielectric lens, patch in between two flares of AVA, balanced AVA (BAVA), metamaterial, computational intelligence (CI), and AVA array. The AVA performance enhancement techniques modify the electrical and physical properties of an antenna which in turn improves its performance. A large number of performance enhancement methods of AVA design have been proposed, however, no comprehensive study exists to categorize these performance enhancement techniques and outline their concepts, advantages, disadvantages, and applications. So, in this paper, we have attempted to outline all methods available for enhancing and optimizing the parameters of AVA. Additionally, to validate some of the important performance enhancement methods, they are incorporated in the basic conventional AVA design and further simulation results are obtained for the same which are in line with the surveyed literature. Each method is explained in detail by incorporating its key points, merits, and demerits. Moreover, illustrations from the literature are given to demonstrate improvement in the parameters as a result of applying a particular performance enhancement technique. INDEX TERMS Antipodal Vivaldi antenna (AVA), AVA array, balanced antipodal Vivaldi antenna (BAVA), corrugations, dielectric lens, metamaterial, parasitic patch, slots.

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UWB antipodal vivaldi antenna for microwave imaging of construction materials and structures

Cited by 23 publications

References 14 publications

Radiation Pattern Analysis and Modelling of Coplanar Vivaldi Antenna Element for Linear Array Pattern Evaluation

Radiation Pattern Analysis and Modelling of Coplanar Vivaldi Antenna Element for Linear Array Pattern Evaluation

Linear Tapered Slot Antenna for Ultra-Wideband Radar Sensor: Design Consideration and Recommendation

A Survey of Performance Enhancement Techniques of Antipodal Vivaldi Antenna

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