New cavity backed capacitively coupled stacked patch element for P-Band SAR application

Limbach, Markus; Gabler, Bernd; Horn, Ralf; Kosc, Alicja; Maria, A. Di

doi:10.1109/eucap.2014.6902205

Cited by 2 publications

(2 citation statements)

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“…However, the multilayer nature of the antenna, as well as the use of foam layers and the lack of space between array elements, prevent its application. Other approaches make use of cavities or closed assemblies to interrupt the propagation of surface waves and thus, enhance the antenna isolation [24], [25].…”

Section: Truncated Cavity Assemblymentioning

confidence: 99%

“…Alternative solutions, such as defected ground structures (DGS) [23] are not suitable in aperture coupled feeding antennas, due to the modification of the ground plane. A costeffective non-planar approach is to place the antenna element within a closed casing structure or isolation walls such as a cavity box [24], [25]. This antenna assembly improves the antenna isolation along E-plane.…”

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: Truncated Cavity Assemblymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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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Design and Analysis of 1:8 Radio Frequency Feeding Network Using Step-Down Impedance Transformer for C-Band Airborne Synthetic Aperture Radar Applications

et al. 2023

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In this research, we developed a unique power divider circuit construction that suppresses harmonic components while providing unequal power division ratios. In antenna arrays, a power divider is used to divide the power among the array's elements. Depending on the design, different power dividers have distinct properties. The purpose of this project was to create a design and examine a 1:8 unequal power divider for C-band applications that operates at 5.3 GHz. The prototype was built on a single board using a duroid RT5880 substrate with relative permittivity of 2.2 and thickness of 1.6 mm. A quarter-wave transformer was utilized to evenly distribute the entire incident power. This design involves adding an extra transmission line to the input side, which is known as a step-down transformer. The input impedance values were reduced and outstanding performance was achieved by using the step-down transformer. Advanced design system software was used in the simulations. The isolation network, which consisted of resisters between the transmission lines, was critical in implementing the radial layout styles and also improved the output port matching and port-to-port isolation. In the operating frequency range, the return loss parameters (S<sub>11</sub>–S<sub>99</sub>) and the isolation were greater than −17 and −37 dB, respectively. The intended structure is compact. The simulated results were in good agreement and demonstrated that all of the ports had matching impedance and the isolation matched the application's requirements.

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New cavity backed capacitively coupled stacked patch element for P-Band SAR application

Cited by 2 publications

References 1 publication

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

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

Design and Analysis of 1:8 Radio Frequency Feeding Network Using Step-Down Impedance Transformer for C-Band Airborne Synthetic Aperture Radar Applications

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