New broad angle frequency scanning antenna with narrow bandwidth based on a CRLH structure

Siaka, Francis; Laurin, Jean‐Jacques; Deban, Ramin

doi:10.1049/iet-map.2016.0732

Cited by 5 publications

(6 citation statements)

References 19 publications

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“…However, in some applications such a wide working bandwidth is not allowed because of mutual interference. The systems presented in Reference 13 are not suitable for two‐dimensional electro‐scanning arrays. As can be seen in the Table 1, The monopulse function is only implemented in paper, 17 but its frequency scanning angle range can only reach 10°.…”

Section: Resultsmentioning

confidence: 99%

“…A comparison between this work and existing papers 10,11,13,17 with similarly structured is given in Table 1. In the paper, 10,11,17 approximately 20% relative operating bandwidth is required to achieve angular scanning range greater than 20 , which is twice the bandwidth required for our work.…”

Section: Resultsmentioning

confidence: 99%

“…The E‐plane bend waveguide are commonly used to compose the slow wave line to broaden the frequency scanning region of the edge‐slotted waveguide antenna, 12 but the linear array generally has a larger size. In the paper, 13 CRLH structures are loaded on the broad walls of a standard RWG in order to enable the FSA to scan a wider angular sector over a narrow operating frequency band, but the radiation efficiency varies greatly at different operating frequencies. A micro‐fabricated frequency scanning slot arrays using the polystrata sequential copper deposition process 14 can scan 32.5° by expanding the operating bandwidth to a relative operating bandwidth of 32.25%.…”

Section: Introductionmentioning

confidence: 99%

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A novel frequency scanning monopulse slotted waveguides array with enhanced scan sector

Yao

Ding

Guo

et al. 2020

Micro & Optical Tech Letters

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A wide-angle frequency scanning narrow-wall slotted waveguide array antenna with monopulse function is designed for two-dimensional electrical scanning radar and communication systems. A novel slow wave waveguide formed by loading the periodic metal T-shaped sheets onto the narrow wall is used to enhance the frequency scanning angular sector of the edge-slotted waveguide traveling wave array. Two slotted waveguides with 35 radiation slots are arranged in a segmented frequency scanning structure to simultaneously achieve sum/difference patterns in the E-plan. The prototype antenna fabricated and welded by aluminum is composed of 70 × 8 radiation slots with an overall size of 425 mm × 45 mm × 10 mm. The measured results show that the designed array exhibits a frequency scanning angle range of 20.6 at a relative operating bandwidth of 10% with greater than 50% aperture efficiency. The measured sidelobe level of sum beam is less than −17 dB, and null depth of difference beam pattern is below-25 dB over operating frequency band. This structure can be used to design the electrical two-dimensional scanning array with a scanning sector greater than 20 × 80 .

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A novel frequency scanning monopulse slotted waveguides array with enhanced scan sector

Yao

Ding

Guo

et al. 2020

Micro & Optical Tech Letters

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“…In [13], SLL below −15 dB was realized in a narrow beam-steering range from −3.6 • to +7.6 • , however, only simulated results were provided. Similar waveguide strucures were found in [19] and [26]. In [19], the CRLH waveguide slot array was synthesized using Elliott's classic slot array design procedure.…”

Section: Crlh Waveguide Lwa With Low Sllmentioning

confidence: 91%

Design of CRLH Leaky-Wave Antenna With Low Sidelobe Level

2019

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Composite right/left-handed (CRLH) waveguide leaky-wave antenna (LWA) with low sidelobe level (SLL) and high radiation efficiency is investigated and designed in this paper. Due to the characteristic of negative and positive dominant mode propagation constant of the CRLH transmission line, a backward to forward beam-steering LWA can be realized through frequency scanning. The leaky-wave radiation is analyzed first based on a Ka-band CRLH waveguide with straight slots differently offset on the broadwall. The propagation constant maintains almost invariable as the slot offset varies, meanwhile the attenuation constant has a considerable dynamic range. Thus meandering long slot, whose offset varies along the CRLH waveguide, can be cut on the broadwall to generate a tapered excitation distribution. A prototype of the proposed CRLH waveguide LWA with meandering long slot is designed and fabricated to validate the design. Measurement results show that continuous beam-steering capability from −29 • to +31 • is achieved, meanwhile the optimized SLLs for the designed antenna patterns are kept below −18.5 dB in the major operating band with the minimum SLL of −22.4 dB at 33 GHz, and the average radiation efficiency is 65.4%. The realized SLLs and radiation efficiency performances of our CRLH LWA surpass others reported in open literatures.INDEX TERMS Beam-steering, composite right/left-handed (CRLH), leaky-wave antenna, meandering long slot, sidelobe level (SLL), tapered distribution.

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“…On the other hand, to realize left-handed nature on a transmission line, a composite right/left-handed transmission line (CRLH-TL) which adds both a series capacitor and a shunt inductor to the original line was first proposed [5]. Then CRLH-TLs consisting of various shapes have been reported [6][7][8][9][10][11][12][13][14][15][16][17][18][19]. Left-handed waveguides are constructed by loading capacitive shorted stubs and inductive windows in [6,7], and also by inserting corrugations [8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Transmission Characteristics on Composite Right/Left-Handed Cylindrical Waveguides Constructed by the Cutoff Te and Tm Modes

Nishimura¹,

Deguchi²,

Tsuji³

2018

PIER M

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This paper proposes a composite right/left-handed cylindrical waveguide. Negative permeability is realized by the cutoff TM 01-mode in a hollow waveguide, and negative permittivity is realized by the cutoff dominant TE-mode in a sector waveguide with a ridge. Usefulness of the proposed cylindrical waveguide is verified from the numerical computations of both the dispersion diagrams and the transmission characteristics of the structure with finite-number unit cells. Finally, measurement of the fabricated waveguides is performed for the experimental verification.

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New broad angle frequency scanning antenna with narrow bandwidth based on a CRLH structure

Cited by 5 publications

References 19 publications

A novel frequency scanning monopulse slotted waveguides array with enhanced scan sector

A novel frequency scanning monopulse slotted waveguides array with enhanced scan sector

Design of CRLH Leaky-Wave Antenna With Low Sidelobe Level

Transmission Characteristics on Composite Right/Left-Handed Cylindrical Waveguides Constructed by the Cutoff Te and Tm Modes

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