Thinned Array Inspired Quasi-Uniform Leaky-Wave Antenna With Low Side-Lobe Level

Javanbakht, Nima; Majedi, Mohammad Saeed; Attari, Amir Reza

doi:10.1109/lawp.2017.2756990

Cited by 27 publications

(35 citation statements)

References 11 publications

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“…Amplitude tapering is one of the most common methods which reduced the SLL by changing the shape, length or width of the slots. Another method is space tapering, in this method by changing the space between the slots of the antenna, SLL is reduced 24,25 . Low SLL is an important factor to minimize the interference of the antenna with other components.…”

Section: Introductionmentioning

confidence: 99%

Mathematical Analysis of a Modified Closed-Form Formula for Design a Uniform Leaky-Wave Antenna With Ultra-Low SLL

Kiani

Geran

Hashemi

et al. 2019

Sci Rep

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Straight long slots have high side-lobes in the far-field amplitude patterns, which reduces their use as high-performance antennas. To reduce these side-lobes, a long slot may be tapered to produce the desired radiation patterns. The theory of control of the aperture distribution to reduce side-lobes has been already reported in some works and well known for already some decades. It is, however, shown in this paper that it may not be good enough to achieve ultra-low side lobes. The theory to analyze and design tapered leaky-wave antennas is described in this paper. Since it is very challenging to achieve a mathematical equation in this regard, some parameters will be calculated using simulation in the first step and the shape of the antenna field is obtained based on these parameters. In the next step, a differential equation is derived for the first step parameters. The solution of this differential equation which is the main motivation of this paper will be expressed in three ways where each part is more accurate than the previous one. According to the measurement results, the structure has a side-lobe level more than −45 dB.

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Section: Introductionmentioning

confidence: 99%

Mathematical Analysis of a Modified Closed-Form Formula for Design a Uniform Leaky-Wave Antenna With Ultra-Low SLL

Kiani

Geran

Hashemi

et al. 2019

Sci Rep

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“…Although the CP LWA in Reference scans from −14° to 16°, its maximum SLL is only −13 dB. The proposed CP LWA scans from −14° to 38°, which is much wider than the LWAs in References . Its maximum SLL is −20 dB, which is lower than those in References .…”

Section: Simulated and Measured Resultsmentioning

confidence: 81%

“…The vertically polarized uniform LWAs in References have narrower scanning ranges and longer lengths. The horizontally polarized quasiuniform LWAs in References 26 and 27 scan only in backward or forward directions with narrower scanning ranges. In addition, the SLLs in Reference are only −17.4 dB.…”

Section: Simulated and Measured Resultsmentioning

confidence: 99%

“…However, the SLLs usually deteriorate as the scan angle increases. Various methods have been presented to suppress the SLLs of uniform, quasi–uniform, and periodic LWAs. In References 23 and 24, SIW long slot LWAs with low SLLs were proposed.…”

Section: Introductionmentioning

confidence: 99%

“…By gradually changing the distance between the long slot and the centerline of the SIW, the attenuation amount α exhibits a tapered distribution along the long slot, which is favorable for reducing the SLLs. In References 26 and 27, the attenuation amounts α are tapered by the degree of transverse slot density, and less than −20 dB SLLs are realized. In Reference , a periodic slotted ridged SIW LWA with wide‐angle scanning and low SLLs was proposed.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Spoof surface plasmon polariton‐fed circularly polarized leaky‐wave antenna with suppressed side‐lobe levels

Jiao

Weng

2019

Int J RF Microw Comput Aided Eng

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A wide-angle scanning circularly polarized (CP) leaky-wave antenna (LWA) with suppressed side-lobe levels (SLLs) is proposed, which can be a good candidate for future radar and wireless communication systems. The LWA consists of 12 cross slotted elliptical patch elements, which are fed by a microstrip spoof surface plasmon polariton (SSPP) line. Two fundamental modes of the patch array with two orthogonal polarizations can be excited by the electromagnetic coupling between the array and the SSPP line. By optimizing the elliptical eccentricity e and etching cross slots on the elliptical patch array, a 90 phase difference is introduced, and then, the CP radiation is realized. A tapered aperture field distribution is also realized by adjusting coupling intensities between the patch elements and the SSPP line, which is beneficial to reduce the SLLs. The electrical size of the LWA is 1.29λ 0 × 6.02λ 0 × 0.08λ 0 , where λ 0 is air wavelength at 12.9 GHz (broadside direction). Both the simulated and measured results indicate that the CP operating band is 12.0 to 15.0 GHz. The proposed CP LWA scans continuously from −14 to 38 . In the whole operating band, the axial ratios are less than 3 dB, and the SLLs are less than −20 dB as well.K E Y W O R D S circular polarization, leaky-wave antenna, low side-lobe levels, spoof surface plasmon polariton

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A tapered CPW fed leaky‐wave antenna based on substrate integrated waveguide with reduced side‐lobe level

Javanbakht

Amaya

Shaker³

et al. 2021

Int J RF Microw Comput Aided Eng

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A novel method for confining the undesired radiation of the feed transition of a low‐profile leaky‐wave antenna (LWA) is demonstrated in this paper. The proposed design method uses novel tapered CPW transitions resulting in variation of the parasitic capacitance and electrical length of the feed. This leads to the reduction of the side‐lobe level (SLL), which is dictated by the feed and the slotted sections of the antenna. The undesired radiation from the feed becomes crucial in the low‐profile antenna in which the surface‐mounted connector along feed transition is the only practical feeding mechanism. The key novelty of the proposed approach is the reduction of SLL by exclusively modifying the feed structure rather than the slotted radiation section. To validate the proposed approach, a modified compact feeding mechanism for LWA is designed. The antenna is realized based on the substrate integrated waveguide (SIW). The antenna's length, width, and height are 110 mm, 31 mm, and 0.5 mm, respectively. The operating frequency band was chosen as 26 to 30 GHz, covering an allocated 5G band. The measured peak realized gain and SLL are 6.1 dBi and − 11.4 dB, respectively. An improvement of 5.7 dB in SLL compared to the conventional LWA was observed. The simple fabrication process and efficiency of the proposed method make it a viable approach for reducing the SLL of the low‐profile antennas. Compactness, low SLL, and proper gain of the reported antenna make it a suitable candidate for 5G vehicle to everything (V2X) communications and mm‐wave navigation systems.

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Thinned Array Inspired Quasi-Uniform Leaky-Wave Antenna With Low Side-Lobe Level

Cited by 27 publications

References 11 publications

Mathematical Analysis of a Modified Closed-Form Formula for Design a Uniform Leaky-Wave Antenna With Ultra-Low SLL

Mathematical Analysis of a Modified Closed-Form Formula for Design a Uniform Leaky-Wave Antenna With Ultra-Low SLL

Spoof surface plasmon polariton‐fed circularly polarized leaky‐wave antenna with suppressed side‐lobe levels

A tapered CPW fed leaky‐wave antenna based on substrate integrated waveguide with reduced side‐lobe level

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