Compact Half-Luneburg Lens Antenna Based on a Glide-Symmetric Dielectric Structure

Zetterström, Oskar; Fonseca, Nelson J. G.; Quevedo–Teruel, Oscar

doi:10.1109/lawp.2022.3179639

Cited by 28 publications

(11 citation statements)

References 29 publications

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“…Alternatively, a hemispherical Luneburg lens can be placed on a reflective ground plane [13]- [15]. The focusing properties of the original beamformer are maintained, however with reduced scanning range [15], [16]. It is worth noting that in a half-Luneburg lens antenna, the height of the device is increased by the protruding feeding system [13].…”

Section: Introductionmentioning

confidence: 99%

Additively Manufactured Half-Gutman Lens Antenna for Mobile Satellite Communications

Zetterström

Fonseca

Quevedo–Teruel

2023

Antennas Wirel. Propag. Lett.

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In this letter, we present an additively manufactured half-Gutman lens antenna operating at 30 GHz. The hemispherical lens allows for a compact beamformer while maintaining the wide scanning capabilities of Gutman lenses. This solution further enables to better integrate the feed system when compared to a more conventional half-Luneburg lens antenna design as the focal arc is moved inside the lens. The graded-index of the lens is implemented with a periodic structure arranged in a body-centred cubic (BCC) lattice. We demonstrate that the BCC structure provides attractive properties for the design of inhomogeneous dielectric lenses. Importantly, the BCC structure can be used to alleviate the manufacturing constrains compared to conventional periodic structures. The lens is fed by a dielectricloaded square waveguide. The proposed antenna produces a directive beam with a simulated and measured peak gain of 26.2 dBi and 25.3 dBi. The antenna can steer its beam in a 50degree range in elevation with measured scan loss and side lobe levels below 1 dB and -10 dB, which agree with the simulated values. The measured cross polarization discrimination is better than 20 dB. The proposed antenna is intended for the ground segment of the emerging low-Earth-orbit satellite communication applications.

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Section: Introductionmentioning

confidence: 99%

Additively Manufactured Half-Gutman Lens Antenna for Mobile Satellite Communications

Zetterström

Fonseca

Quevedo–Teruel

2023

Antennas Wirel. Propag. Lett.

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“…However, an important drawback of these solutions is their large footprint, which may be impractical in applications with limited space. To reduce the size of these lenses, a mirroring plane has been used, resulting in half-Luneburg lens antennas [23]- [25], which are more compact but have a reduced scanning range and higher scan losses.…”

Section: Introductionmentioning

confidence: 99%

Geodesic Half-Maxwell Fish-Eye-Lens Antenna

Yang

Chen

Mesa

et al. 2023

IEEE Trans. Antennas Propagat.

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We propose and implement a geodesic half-Maxwell fish-eye lens antenna. The lens was optimized using an inhouse physical optics code adapted for generalized geodesic lenses. The final antenna design was validated with commercial electromagnetic simulation software. The antenna combines a modulated geodesic half-Maxwell fish-eye lens and a transition to a linear flare, which is needed to preserve the linear polarization in the aperture. The antenna prototype, designed to operate in Ka-band, was manufactured with CNC milling and measured in an anechoic chamber. The design provides continuous beam scanning thanks to a mechanically actuated feed. Promising beam scanning properties are demonstrated in an angular range of ±45°with scan loss below 3 dB, as well as good frequency stability from 26 GHz to 32 GHz. Since the antenna is fully metallic, its radiation efficiency is high (approximately 90%).

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“…The development of dielectric lenses for meter wave applications was the beginning of the long history of dielectric lens antennas [3]. However, further progress was made until World War II But after a few years, they were replaced by reflector antennas, which were smaller in size in microwave configuration [4]. In addition, following very rapid advancements in millimeter-and sub-millimeter wave circuit technology, considerable research interest has developed in dielectric lens antennas over the past two decades due to their small size at these applicable frequencies.…”

mentioning

confidence: 99%

Optimal Dimensions and Performance Evaluation of a Truncated Spherical Dielectric Lens Antenna at X-Band Frequencies

Ali,

Ahsan,

Khairi

et al. 2024

Preprint

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This study presents the design and development of a truncated spherical dielec-tric lens antenna. The objective was to enhance and optimize the directivity and beamwidth of the feed antenna by adjusting the feed position around the focal point of the lens. Polyetrafluoroethylene (PTFE), with a dielectric constant of 2.1, was chosen as the lens medium. Simulations were conducted using CST Studio Suite over a frequency range of 8 to 12 GHz. Experimental validation was performed using a vector network analyzer (VNA) and an anechoic chamber. The optimized dimensions of the dielectric lens antenna were determined as follows: lens thickness (T) = 24.34 mm, center of curvature (R) = 55 mm, and lens aperture (L) = 110 mm. This configuration achieved a directivity of 21.9 dBi and a beamwidth of 13.1°. The resulting dielectric lens antenna exhibits a compact size, simple geometric shape, and ease of design and construction. These characteristics make it highly suitable for RF applications, particularly when energy concentration is required.

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Compact Half-Luneburg Lens Antenna Based on a Glide-Symmetric Dielectric Structure

Cited by 28 publications

References 29 publications

Additively Manufactured Half-Gutman Lens Antenna for Mobile Satellite Communications

Additively Manufactured Half-Gutman Lens Antenna for Mobile Satellite Communications

Geodesic Half-Maxwell Fish-Eye-Lens Antenna

Optimal Dimensions and Performance Evaluation of a Truncated Spherical Dielectric Lens Antenna at X-Band Frequencies

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