Dual-Polarized Multilayer L-Band Asymmetric Subarray with Truncated Electric Walls Separation for Airborne SAR Applications

Lorente, Diego; Limbach, Markus; Gabler, Bernd; Esteban, H.; Boria, Vicente E.

doi:10.23919/eurad50154.2022.9784581

Cited by 1 publication

(2 citation statements)

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“…The azimuth feeding network excites the antenna elements of each array row in phase with the proper amplitude distribution, being H 1-5 , H A-E , V 1-5 , V A-E the feeding inputs for each polarization and array row. Due to the antenna symmetry, the azimuth network is composed of two electrical identical mirrored feeding networks, each of one excites a subarray 5×4 [26]. The elevation network is an additional feeding topology, that provides the beamforming in elevation by applying a progressive phase difference φ 1-5 and an amplitude distribution E 1-5 .…”

Section: Design Of a Planar Phased Array Of 5×8 Elementsmentioning

confidence: 99%

“…The proposed solution makes use of solid truncated cavities to enhance the antenna element isolation, in order to achieve a high density of array elements by using a tight inter-element spacing of 0.48λ 0 . The presented phased array is built from two mirrored subarray antennas [26], and provides beam steering in elevation. In order to extend the degree of compactness, the feeding network is directly integrated within the antenna housing assembly, by means of which no electrical interconnection with cables is needed.…”

Section: Introductionmentioning

confidence: 99%

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Highly Integrated Low-Profile Multilayer Dual-Polarized Phased Array Antenna With Truncated Cavities for First Pulsed Bistatic L-Band Airborne SAR Sensor

Lorente,

Limbach,

Gabler

et al. 2024

IEEE Access

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Synthetic Aperture Radar (SAR) has become, nowadays, one of the most important techniques in remote-sensing, and the increasing interest in Earth monitoring reinforces this trend. Next generation SAR sensors will enhance the radar resolution capabilities by means of digital beamforming (DBF) techniques along with multistatic systems. In order to support the technological development of future spaceborne SAR missions, airborne sensors become an essential scope of research. Thereby, future airborne SAR systems demand enhanced DBF capabilities that involve phased array antennas with a high density of array elements. However, the antenna aperture size is significantly limited in airborne applications, which leads to low-profile and highly integrated antenna solutions, becoming a more challenging task for lower frequency operations such as L-band. In this work, a compact L-band dual-polarized multilayer phased array antenna with beam steering in elevation, developed for the next generation German Aerospace Center (DLR) airborne SAR system, is presented. The proposed design makes use of truncated cavities to improve the array element isolation, and provides 66% more antenna elements than the previous L-band phased array of the current DLR airborne SAR sensor with the same antenna aperture size. Measurements of a manufactured prototype show an antenna bandwidth of almost 20%, matching levels better than 17 dB, up to 15 dB gain and crosspolarization suppression values higher than 35 dB. Thus, the proposed work will allow the application of advanced DBF techniques in the upcoming first pulsed bistatic L-band airborne SAR sensor.INDEX TERMS airborne, beamforming, bistatic, integration, phased array antenna, truncated cavity, synthetic aperture radar.

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Section: Design Of a Planar Phased Array Of 5×8 Elementsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%