scholarly journals A Wide-Angle Scanning Sub-Terahertz Leaky-Wave Antenna Based on a Multilayer Dielectric Image Waveguide

Electronics ◽  
2021 ◽  
Vol 10 (17) ◽  
pp. 2172
Author(s):  
Yalda Torabi ◽  
Gholamreza Dadashzadeh ◽  
Milad Hadeie ◽  
Homayoon Oraizi ◽  
Ali Lalbakhsh
Keyword(s):  
Lower Layer ◽  
Stop Band ◽  
Impedance Bandwidth ◽  
Frequency Range ◽  
Leaky Wave ◽  
Efficient Operation ◽  
Scanning Angle ◽  
Leaky Wave Antenna ◽  
Wave Antenna ◽  
Layered Dielectric

This paper presents a new layered dielectric leaky-wave antenna (LWA) for the sub-terahertz (THz) frequency range capable of efficient operation at the broadside with a wide beam scanning angle and stable gain. It consists of a conductor-backed alumina dielectric image line (DIL) with two different dielectric layers mounted on top of each other for performance improvement. The upper layer is a high permittivity RO6010 substrate to enhance the directivity as a superstrate and the lower layer is a low-permittivity RT/duroid 5880 substrate stacked on the alumina DIL to prevent the probable excitation of higher-order modes in the DIL channel. A 15-element linear array of radiating overlapped discs is used to mitigate the open stop-band (OSB) problem, fed by the mentioned waveguide, was designed and simulated at frequencies around 170 GHz. The dominant mode of the layered dielectric waveguide is perturbed by the infinite space harmonics generated by two sets of overlapped discs periodically sandwiched between the layers. It exhibited a relatively wide impedance bandwidth of 28.19% (157.5–206 GHz). Its radiation mechanism has been widely studied through simulations. The results revealed that the antenna provides a wide scanning capability through the broadside from −23° to 38°, covering the frequency range between 157.5 GHz and 201.5 GHz. For an array with 15 radiating elements, the simulated peak gain in the band is 15 dBi and the broadside gain is 13.6 dBi at 172 GHz.

T-type folded SIW-based leaky-wave antennas with wide scanning angle and low cross-polarization

2021 ◽  
pp. 1-6
Author(s):  
Shixiao Xiao ◽  
Lianwu Yang
Keyword(s):  
Transmission Lines ◽  
Cross Polarization ◽  
Frequency Range ◽  
Leaky Wave ◽  
Scanning Angle ◽  
Sinusoidal Modulation ◽  
Wave Characteristics ◽  
Leaky Wave Antenna ◽  
Wave Antenna ◽  
Transverse Slot

Abstract In this paper, a leaky-wave antenna (LWA) with wide scanning angle and low cross-polarization is proposed based on a T-type folded substrate-integrated waveguide (FSIW). Transverse slots with a sinusoidal distribution pattern are etched on the surface of the FSIW so that transmission lines with slow-wave characteristics can excite and radiate −1 order harmonics. The length of the transverse slot affects the dispersion characteristics of the transmission line, and the sinusoidal modulation period controls the operating range of the LWA. In the frequency range of 8.3–15 GHz, the proposed LWA achieves a wide scanning ranging from backward −42° to forward +68° continuously. The cross-polarization of the beam is also kept at less than −30 dB during this scanning. A prototype is fabricated and measured to confirm the design, and the measured results show an agreement with the simulated one.

scholarly journals Periodic Microstrip Leaky Wave Antenna with Double-Sided Shorting Pins and Pairs of Slots

2020 ◽  
Vol 2020 ◽  
pp. 1-9
Author(s):  
Yahuan Chen ◽  
Kuang Wang ◽  
Yuanxin Li ◽  
Yunliang Long
Keyword(s):  
Radiation Pattern ◽  
Structural Parameters ◽  
Ground Plane ◽  
Stop Band ◽  
Leaky Wave ◽  
Rectangular Patch ◽  
Leaky Wave Antenna ◽  
Wave Antenna ◽  
Shorting Pin ◽  
Frequency Changes

A backward to forward scanning periodic microstrip leaky wave antenna (MLWA) is presented. The proposed antenna consists of a long rectangular patch with alternating shorting pin on each side, which connects the antenna patch and the ground plane to form periodic shorting circuits. There are two pairs of slots alternately spaced on the long patch to suppress the open stop band (OSB). The OSB problem was initially reduced by optimizing the structural parameters, and the slotting on the patch further improved it. The measured radiation pattern in the y-z plane shows that the antenna can scan electronically from 142° to 39° toward the end-fire (+z direction) when the operating frequency changes from 6 GHz to 12.9 GHz. The measured gain is greater than 5 dBi over the entire operating band.

Radially Periodic Leaky-Wave Antenna for Bessel Beam Generation Over a Wide-Frequency Range

2018 ◽  
Vol 66 (6) ◽  
pp. 2828-2843 ◽  
Author(s):  
Davide Comite ◽  
Walter Fuscaldo ◽  
Symon K. Podilchak ◽  
Pascual D. Hilario Re ◽  
Victoria Gomez-Guillamon Buendia ◽  
...  
Keyword(s):  
Bessel Beam ◽  
Wide Frequency Range ◽  
Frequency Range ◽  
Leaky Wave ◽  
Beam Generation ◽  
Leaky Wave Antenna ◽  
Wave Antenna

Microstrip Line Fed Leaky Wave Antenna with Shorting Vias for Wideband Systems

2016 ◽  
Vol 6 (4) ◽  
pp. 1725 ◽  
Author(s):  
T V Rama Krishna ◽  
B T P Madhav ◽  
G Monica ◽  
V Janakiram ◽  
S Md Abid Basha
Keyword(s):  
Propagation Constant ◽  
Stop Band ◽  
Wave Structure ◽  
Travelling Wave ◽  
Strip Line ◽  
Defected Ground Structure ◽  
Leaky Wave ◽  
Leaky Wave Antenna ◽  
Wave Antenna ◽  
Conducting Path

In this work a complex structured shorted vias microstrip leaky wave antenna is designed and analysed. A Leaky wave antenna is a travelling wave structure with complex propagation constant. When shorting vias are loaded in a periodic structure the fundamental resonant mode shows some stop band characteristics and some of the modes will strongly attenuated. Three different types of iterations are examined in this work with and without defected ground structures. The defected ground structure based leaky wave antennas are showing better performance characteristics with respect to efficiency and phase. A micro strip line feeding with impedance of 50 ohms at both ports are providing excellent impedance matching to the conducting path on the microstrip surface. The shorting vias are suppressing certain higher order frequency bands and providing excellent wide band characteristics with low loss.

scholarly journals Microstrip Line Fed Leaky Wave Antenna with Shorting Vias for Wideband Systems

2016 ◽  
Vol 6 (4) ◽  
pp. 1725
Author(s):  
T V Rama Krishna ◽  
B T P Madhav ◽  
G Monica ◽  
V Janakiram ◽  
S Md Abid Basha
Keyword(s):  
Propagation Constant ◽  
Stop Band ◽  
Wave Structure ◽  
Travelling Wave ◽  
Strip Line ◽  
Defected Ground Structure ◽  
Leaky Wave ◽  
Leaky Wave Antenna ◽  
Wave Antenna ◽  
Conducting Path

In this work a complex structured shorted vias microstrip leaky wave antenna is designed and analysed. A Leaky wave antenna is a travelling wave structure with complex propagation constant. When shorting vias are loaded in a periodic structure the fundamental resonant mode shows some stop band characteristics and some of the modes will strongly attenuated. Three different types of iterations are examined in this work with and without defected ground structures. The defected ground structure based leaky wave antennas are showing better performance characteristics with respect to efficiency and phase. A micro strip line feeding with impedance of 50 ohms at both ports are providing excellent impedance matching to the conducting path on the microstrip surface. The shorting vias are suppressing certain higher order frequency bands and providing excellent wide band characteristics with low loss.

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