Transmission-Line Model of Nonuniform Leaky-Wave Antennas

Nguyen‐Trong, Nghia; Hall, Leonard; Fumeaux, Christophe

doi:10.1109/tap.2016.2517669

Cited by 41 publications

(19 citation statements)

References 36 publications

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“…Their main beam directions can be steered by varying their source frequencies [1], [2]. Correspondingly, LWAs can bring significant benefits including a simple feed network, wide-angle beam scanning, a low profile and cost effectiveness [3]- [7]. However, for applications to radar and satellite communication systems, it is also preferred to radiate a circularly polarized (CP) wave rather than a linearly polarized (LP) one, i.e., the CP LWAs are highly desired to avoid polarization mismatch and to suppress multi-path interference during beam scanning [8]- [10].…”

Section: Introductionmentioning

confidence: 99%

Circular-Polarized Substrate-Integrated-Waveguide Leaky-Wave Antenna With Wide-Angle and Consistent-Gain Continuous Beam Scanning

Chen

Karmokar

et al. 2019

IEEE Trans. Antennas Propagat.

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Circularly-polarized (CP) antennas are highly desired for future wireless communications. To advance the development of CP substrate-integrated-waveguide (SIW) leakywave antennas (LWAs) with the intent to meet this demand, a novel benzene-ring-shaped slot-loaded LWA with partially reflecting wall (PRW) vias is investigated and verified to realize wide-angle continuous beam scanning with consistent gain. The dispersion features of slot-loaded SIW LWAs with PRW vias are theoretically explored using an equivalent circuit model. The CP radiation feature is investigated numerically utilizing the E-and H-field distributions of an initial design and its equivalent magnetic currents. The results of these studies are used to demonstrate that improved CP performance over a wideangle scan range can be attained with a change from a standard slot shape to a benzene-ring-shaped slot. The resulting benzenering-shaped slot-loaded CP SIW LWA was optimized, fabricated, and measured. The measured results verify that a CP beam was continuously scanned through a wide angle from backward to forward directions with a consistent gain. The prototype exhibits a continuous 97.1 • CP beam scan with a gain variation between 8 and 11.3 dBic when the source frequency is swept from 9.35-11.75 GHz.

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Section: Introductionmentioning

confidence: 99%

Circular-Polarized Substrate-Integrated-Waveguide Leaky-Wave Antenna With Wide-Angle and Consistent-Gain Continuous Beam Scanning

Chen

Karmokar

et al. 2019

IEEE Trans. Antennas Propagat.

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“…In this work, the sharpness of the bends along the body of a microstrip transmission line is advantageously used to realize a fundamentally different leaky wave antenna with a broadband impedance matching and high gain characteristics in the Ku-band. Our attention has been channeled to cost-effectively increase the overall antenna efficiency with a widened bandwidth, with lower weight, and with a reduction in fabrication costs [4,27,28]. The main objective of the paper is to propose microstrip LWAs with a low profile and to analyze the bending effects.…”

Section: Introductionmentioning

confidence: 99%

Realization of Low Profile Leaky Wave Antennas Using the Bending Technique for Frequency Scanning and Sensor Applications

Kandwal

Nie

Wang

et al. 2019

Sensors

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This paper proposes an efficient transmission line modulation by using the bending technique to realize low profile leaky wave antennas in the Ku-band for frequency scanning and sensor applications. The paper focuses mainly on the bending effects of the transmission line in terms of the sharpness of edges. The right-hand/left-hand transmission line can be designed in the form of zig-zag pattern with sharp corners and only the right-hand transmission line in the form of sinusoidal patterns with smooth corners. In this presentation, we demonstrate that transmission lines of this kind can be used to realize highly efficient leaky wave antennas with broadband impedance matching and high gain characteristics in the Ku-band. Dispersion analysis and ladder network analysis have been performed for investigating the performance of the proposed designs. The sharpness of the bends periodically distributed along the body of the antenna has been used to our advantage for frequency scanning in the left-hand and right-hand quadrants at different frequencies. The proposed bending technique has been proven to be instrumental in achieving the desired characteristics of low profile leaky wave antennas.

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“…demonstrated another method in which changing the positions of feed along one edge of the full width multi-terminal microstrip leaky wave antenna, 20 lumped capacitors were used in [16] for the demonstration of control main beam at fixed frequency by loading such capacitors at the one edge of HW-MLWA. The frequency bands for such communications are often narrow, so it is highly desirable to scan the beam at a certain fixed frequency [17], [18]. There is a lot of research in this area and many models have been introduced for this.…”

Section: Introductionmentioning

confidence: 99%

Control Radiation Pattern for Half Width Microstrip Leaky Wave Antenna by Using PIN Diodes

Mohsen¹,

Isa²,

Zakaria³

et al. 2018

IJECE

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<p class="Default">In this paper, a novel design for single-layer half width microstrip leakywave antenna (HW-MLWA) is demonstrated. This model can be digitally control its radiation pattern at operation frequency and uses only two values of the bias voltage, with better impedance matching and insignificant gain variation. The scanning and controlling the radiation pattern of leaky-wave antennas (LWA) in steps at an operation frequency, by using switches PIN diodes, is investigated and a novel HW-MLWA is introduced. A control cell reconfigurable, that can be switched between two states, is the basic element of the antenna. The periodic LWA is molded by identical control cells where as a control radiation pattern is developed by combining numerous reconfigurable control cells. A gap capacitor is independently connected or disconnected in every unit cell by using a PIN diode switch to achieve fixedfrequency control radiation pattern scanning. The profile reactance at the free edge of (HW-MLWA) and thus the main lobe direction is altered by changing the states of the control cell. The antenna presented in this paper, can scan main beam between 18o to 44o at fixed frequency of 4.2 GHz with measured peak gain of 12.29 dBi.</p>

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Transmission-Line Model of Nonuniform Leaky-Wave Antennas

Cited by 41 publications

References 36 publications

Circular-Polarized Substrate-Integrated-Waveguide Leaky-Wave Antenna With Wide-Angle and Consistent-Gain Continuous Beam Scanning

Circular-Polarized Substrate-Integrated-Waveguide Leaky-Wave Antenna With Wide-Angle and Consistent-Gain Continuous Beam Scanning

Realization of Low Profile Leaky Wave Antennas Using the Bending Technique for Frequency Scanning and Sensor Applications

Control Radiation Pattern for Half Width Microstrip Leaky Wave Antenna by Using PIN Diodes

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