Leaky wave antenna for wide range of beam scanning through broadside in dielectric image line environment

Abstract

In this letter, a broadband leaky wave antenna based on dielectric image line (DIL) is proposed in Ku‐band. An H‐shaped metal strip is used to mitigated the open stop band problem. A prototype is measured which exhibits an impedance bandwidth of 33.2% (11.3–15.8 GHz) and the beam scanning of 98° (−60° to 38°) through broadside. The measured peak gain in the band is 15 dBi.

Microstrip tapered traveling wave antenna for wide range of beam scanning in X‐ and Ku‐bands

“…In Reference , the authors proposed a continuous beam scanning by applying noncutoff substrate integrated waveguide to the leaky‐wave antenna design. In Reference design of a broadband (%33.2) leaky wave antenna with dielectric image line was proposed for Ku‐band applications within the range of 11.3 to 15.8 GHz with scanning range of −60 to 38°. The proposed design requires a planar structure and obtains less dispersive beam scanning compared with a composite right/left‐handed (CRLH) leaky‐wave antenna design.…”

“…Furthermore in References , substrate integrated waveguide has been used in the design of the TWA in the X ‐and Ku bands. In Reference , beam scanning has been achieved through broadside in dielectric image line environment in the same bands. Herein, a TWA design is achieved as a simple microstrip tapered traveling wave antenna that is capable of a wide range of beam scanning by changing the operation frequency within 8 to 14 GHz.…”

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

“…Moreover, for a single mode operation, their sectional dimensions must be in the order of one-tenth of a wavelength, which makes their fabrication challenging [18]. To overcome these weaknesses at sub-THz frequencies, a dielectric waveguide with superior loss characteristics is effectively used to develop LWAs [19][20][21][22][23][24][25][26][27][28]. Dielectric waveguides are a different class of transmission lines that include one or more insulating dielectrics to guide the electromagnetic wave.…”

“…By introducing a periodic perturbation along the DIL as a semi-open structure, power leakages will happen, and radiation can be produced in a controlled manner to satisfy specific applications. To date, various LWAs have been proposed in the literature based on the periodic perturbations of the DIL either by dielectric gratings or metallic loadings [19][20][21][22][23][24][25][26][27]. Dielectric grating LWAs usually do not radiate in the exact broadside frequency direction as the internal resonance prevents radiation there, which is called the open-stop-band (OSB) phenomenon.…”

Compact bilayer substrate integrated waveguide leaky wave antenna with dumbbell‐shaped slot based on the TE 20 mode

“…The leaky wave antennas (LWAs) are considered to be the traveling-wave antenna family which generally radiate in a wide bandwidth and have an ability for angular scanning of a part of space. [1][2][3][4][5][6][7] In these antennas, due to the phase-tofrequency dependency, by changing the frequency, the angle of main beam radiation of the antenna is changed and so the LWA can scan a frequency range. [1][2][3][4][5][6][7] The prototypes of these antennas are made using conventional rectangular waveguides.…”