Beam-switchable scanning leaky-wave antenna

Wang, Chien-Jen; Shih, Ying-Chou; Jou, Christina F.

doi:10.1049/el:20000476

Cited by 9 publications

(3 citation statements)

References 2 publications

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“…Reconfigurable leaky wave antennas (LWAs) are cost-effective succedanea to realize beam scanning. In these antenna, varactors, ferrites and liquid crystals (LC) are incorporated to realize fixed-frequency beam scanning [2][3][4][5][6][7][8][9][10]. The LCs refer to a kind of tunable anisotropic material, whose permittivity tensor can be artificially controlled by the magnetic or electric bias field [11,12].…”

Section: Introductionmentioning

confidence: 99%

Reconfigurable holographic antenna with low sidelobe level based on liquid crystals

Che

Meng

Lyu

et al. 2020

J. Phys. D: Appl. Phys.

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A novel liquid crystal (LC)-based holographic antenna (HA) with low sidelobe level is proposed in this paper to achieve large beam scanning range and multi-beam scanning property. The operating principle and the design procedure of the LC HA are presented. The influence of the on-to-off ratio of the holographic array element on the reconfigurable HA’s radiation characteristics is investigated. It is shown that the larger on-to-off ratio can reduce the sidelobe level of the reconfigurable HA, or decrease the iteration number of sidelobe optimization algorithms and enable the algorithms to converge to a much lower optimal sidelobe level. An effective design method to increase the array element’s on-to-off ratio is proposed through introducing an auxiliary radiation component, which offsets the radiation for the turn off state and enhances the radiation for the turn on state. A prototype of the LC HA consisting of the elements with large on-to-off ratio is designed and simulated to demonstrate the design method and theoretical predictions. Results show that, benefiting from the enhanced on-to-off ratio, the LC HA naturally presents a sidelobe level of −12.2 dB at broadside without any optimization. Compared with previous work, the sidelobe level is 3.2 dB lower than the case without large on-to-off ratio. Moreover, the proposed LC HA shows a quite large beam scanning range rising from −57.7° to +57.4° and a dynamic multi-beam property.

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Section: Introductionmentioning

confidence: 99%

Reconfigurable holographic antenna with low sidelobe level based on liquid crystals

Che

Meng

Lyu

et al. 2020

J. Phys. D: Appl. Phys.

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“…The dual-beam MLWA has been used as the element of array [6]. In 2000, a beam-switchable scanning leakywave antenna with two feeding terminals is described by Wang et al [7]. The radiation patterns can switch between one-beam mode and dual-beam mode by changing the DC bias voltage of the switch.…”

Section: Introductionmentioning

confidence: 99%

Microstrip leaky‐wave antenna with beam‐patterns switchable capability

Xue

Yung

Long

2007

Micro & Optical Tech Letters

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out multiple frequency bands according to the requirement in different situations. Compared with conventional UWB antennas etched with a quarter-wavelength slot for generating notch frequency bands [6, 15], the average diameter of SRRs are much smaller, as about one-tenth of the resonant wavelength. Thus though multiple SRRs etched in the UWB antenna, the proposed antenna still keeps a compact dimension. As a practical example, an optimized antenna with a small size of 33 mm ϫ28 mm etched with two SRRs has been designed and fabricated, and the measured results agree well with the simulation. This antenna has two notch frequency bands centered at 3.65 and 5.75 GHz while retaining an ultra-wide bandwidth from 2.4 to 10.1 GHz, which covers the entire frequency band for most commercial communication systems. This new type of UWB antenna can be utilized for various applications where compact size, low profile and multiple band rejections are required. band-notched planar monopole antenna for multiband wireless systems, IEEE Microwave Wireless Compon Lett 15 (2005), 576-578. 9. V.G. Veselago, The electrodynamics of substances with simultaneously negative values of and , Soviet Physical Uspekhi 10

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“…M ICROSTRIP leaky-wave antennas [1]- [4] have the advantages of narrow beamwidth, small size, easy fabrication, easy matching, frequency scanning, and can be easily integrated with other useful circuits (such as an amplifier [1], a VCO [2], a switch circuit [3]) on the same substrate to be used in communication systems. Recently, some researches have successfully achieved dual-beam symmetrically scanning capability [2]- [4].…”

Section: Introductionmentioning

confidence: 99%

A dual-beam asymmetrically scanning leaky-wave antenna by utilizing a HEMT resistive upconverter

Wang

Sheu²,

Jou

2001

IEEE Microw. Wireless Compon. Lett.

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A dual-beam asymmetrical scanning microstrip leaky-wave antenna (LWA) has been demonstrated in this paper. A HEMT resistive upconverter output is connected to one terminal of the LWA, and a local oscillator (LO) signal is connected to the other terminal. In this experiment, we set the LO frequency at 9.5 GHz so that the right beam is fixed at 48 . By changing the IF frequency from 0.7 GHz to 1.5 GHz, the module of the LWA can steer the left main beam of the far-field pattern from 136 to 158 (the total scanning angle of 22 ). Comparisons between the measured and theoretical results indicate that the design can achieve the asymmetrically scanning capability and agree well over the tuning bandwidth of 0.8 GHz.Index Terms-Dual-beam asymmetrically scanning, resistive upconverter.

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Beam-switchable scanning leaky-wave antenna

Cited by 9 publications

References 2 publications

Reconfigurable holographic antenna with low sidelobe level based on liquid crystals

Reconfigurable holographic antenna with low sidelobe level based on liquid crystals

Microstrip leaky‐wave antenna with beam‐patterns switchable capability

A dual-beam asymmetrically scanning leaky-wave antenna by utilizing a HEMT resistive upconverter

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