An S/X-band Multi-layer Shared Aperture Antenna with Frequency Ratio of 2.9 for Airborne Synthetic Aperture Radar Applications

Kothapudi, Venkata Kishore; Kati, Praveena; Nunna, Bala Ankaiah; Mindala, Pavan Sagar; Kayithi, Adarsh; Shivagari, Sushanth Reddy; Kandhi, Hari Vara Prasad Reddy; Meesala, Bharath; Tiyyagura, Yeswanth Reddy; Eduru, Srinivas Reddy

doi:10.1109/piers53385.2021.9694743

Cited by 5 publications

(3 citation statements)

References 21 publications

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“…A single-layer antenna array is an element array in X and Ku bands. Compared to the SAAs in [5][6][7][8][9][10][11], [13], and [16][17][18][19][20][21][22], the suggested SAA has an FR of 1.426, better gains, and better band isolation. The dual-band prototype has a compact, multi-layer, planar SAA architect.…”

Section: B Ku-band 5-element Designmentioning

confidence: 99%

“…S/X multilayer SAA, S-band antenna designed with cross-shaped proximity coupled square patch 4×4 planar array at S-band frequency of 2.7 GHz and X-band frequency of 9.7 GHz. S/X DBDP bandwidth 7.7/4.8%, isolation between two bands 25dB, Sidelobe levels of S-band and X-band -13/-15 dB, a gain of these bands are 8.48/21.8 dBi overall size of SAA 125×125×0.8 mm3 [8].…”

Section: Introduction Sar Technology Bymentioning

confidence: 99%

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An X/Ku-Band Series Feed Center Fed Shared Aperture Array Antenna for AIR-Borne Synthetic Aperture Radar Applications

Kati,

Kothapudi

2023

Mikrotalasna revija = Microwave Review

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A 5-element Shared Aperture Antenna Array for X/Ku-band Airborne synthetic aperture radar (AIR-SAR) applications is presented in this research work. As far as the authors are aware, few shared aperture antennas (SAA) exist that cover both X/Ku-band frequencies. The presented research is focused on designing a dual-band single linear-polarized (DBSP) series-fed center-fed (SFCF) X/Ku-band. The implementation of SAA is with the perception of an SFCF 5element group as one group with three patches that are arranged orthogonal to each other to form two sets (3-patches) to realize a series fed array with coaxial probe feeding method in X/Kubands. The X-band (9.3 GHz) is best suited for soil moisture estimation in agricultural areas; the Ku-band (13.265 GHz): is mainly for snow and cold regions and disaster monitoring. The SAA prototype is fabricated and measured with S-parameters and radiation pattern characteristics to verify the antenna design concept, including gain measurements. The antenna exhibits -10 dB impedance bandwidth (BW) (9.1919-9.4674 GHz) (276 MHz with 2.96% BW) in X-band and (13.054-13.513 GHz) (459 MHz with 3.46% BW) in Ku-band. More than 25 dB of isolation has been measured between the ports and two separate bands in the same polarization. The antenna's X-band gain is 12 dBi at port-1 and its Ku-band gain is 11.3 dBi at port-2, according to the measurements. X-band side-lobe level (SLL) is better than -16.2 dB at port-1 and Ku-band SLL is better than -14.1 dB at port-2, as measured by SLL. The X/Ku-DBSP SAA has total dimensions of 120 × 60 × 1.6 mm 3 and for the presented design, measured and simulated results are in good agreement.

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Section: B Ku-band 5-element Designmentioning

confidence: 99%

Section: Introduction Sar Technology Bymentioning

confidence: 99%

An X/Ku-Band Series Feed Center Fed Shared Aperture Array Antenna for AIR-Borne Synthetic Aperture Radar Applications

Kati,

Kothapudi

2023

Mikrotalasna revija = Microwave Review

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“…In [10], a technique to achieve high isolation level up to 30 dB is presented using the differential feed network with large aperture size and high gain variation within L/X-band respectively. In [11] and [12], optimization techniques for achieving high inter-band isolation in multilayer SAA structures are proposed however the resulting height of antennas is large. In this work, a simple and systematic approach is adopted to design the proposed dual-band SAA array for both X and Kuband operations.…”

Section: Introductionmentioning

confidence: 99%

A Compact and High Gain X/Ku Band Shared Aperture Antenna Array with Enhanced Inter-band and Cross-band Isolation

Ali,

Awan,

Malik

et al. 2024

IEEE Access

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This paper introduces a dual-band shared-aperture antenna (SAA) designed to operate in both X and Ku-bands. The approach begins with the initial design and optimization of X-band and Ku-band antenna arrays on separate apertures. Subsequently, these arrays are integrated onto a single aperture to create a shared-aperture antenna array. For the X-Band, a single-port 4×1 element array is designed using a seriesfed network. This configuration is later upgraded to a four-port 4×4 element array to enhance gain. The interelement spacing is optimized at 19.1 mm to accommodate Ku-band array elements. The Ku-Band antenna array employs an aperture-coupled feeding technique with a corporate feed network, maintaining a consistent inter-element spacing of 19.1 mm. Both 4×4 element antenna arrays for X and Ku-bands, configured with multi-ports and single-port networks, are fabricated on a single aperture while maintaining an overall size of 114×96×1.6 mm 3 . Performance analysis of both the configurations i.e. Multiport Shared Aperture Antenna (MPSAA) Array and Single Port Shared Aperture Antenna (SPSAA) array is conducted. The achieved gains are 13.1/13.4 dBi for MPSAA and 18.5/19.1 dBi for SPSAA in both respective X/Ku bands, while maintaining a Side Lobe Level (SLL) of -9 dB and -10 dB. In addition, the measured results indicate significant inter-band and cross-band isolation, surpassing 25/35 dB (for X/Ku band) and 35 dB for MPSAA and crossband of >40 dB for SPSAA, respectively. The return loss bandwidth in the case of MPSAA for X/Ku-band is measured at 350/900 MHz, with resonance between 10.0-10.35 GHz and 13.0-13.9 GHz, respectively. The design utilizes Rogers RT/Duroid-5880 with a 0.79 mm thickness as the substrate. Simulation and measured results show good agreement. The compact size, high gain, and exceptional inter-/cross-band isolation make this design suitable for integration into modern communication systems and beamforming applications.INDEX TERMS Aperture antennas, dual band, shared aperture.

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DESIGN AND ANALYSIS OF 1 × 8 RF POWER DIVIDER/COMBINER USING IMPEDANCE LIMITATION METHOD FOR C-BAND AIRBORNE SYNTHETIC APERTURE RADAR APPLICATIONS

Kothapudi

Vallabhaneni²,

sanaka³

et al. 2022

Telecom Rad Eng

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An S/X-band Multi-layer Shared Aperture Antenna with Frequency Ratio of 2.9 for Airborne Synthetic Aperture Radar Applications

Cited by 5 publications

References 21 publications

An X/Ku-Band Series Feed Center Fed Shared Aperture Array Antenna for AIR-Borne Synthetic Aperture Radar Applications

An X/Ku-Band Series Feed Center Fed Shared Aperture Array Antenna for AIR-Borne Synthetic Aperture Radar Applications

A Compact and High Gain X/Ku Band Shared Aperture Antenna Array with Enhanced Inter-band and Cross-band Isolation

DESIGN AND ANALYSIS OF 1 × 8 RF POWER DIVIDER/COMBINER USING IMPEDANCE LIMITATION METHOD FOR C-BAND AIRBORNE SYNTHETIC APERTURE RADAR APPLICATIONS

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An S/X-band Multi-layer Shared Aperture Antenna with Frequency Ratio of 2.9 for Airborne Synthetic Aperture Radar Applications

Cited by 5 publications

References 21 publications

An X/Ku-Band Series Feed Center Fed Shared Aperture Array Antenna for AIR-Borne Synthetic Aperture Radar Applications

An X/Ku-Band Series Feed Center Fed Shared Aperture Array Antenna for AIR-Borne Synthetic Aperture Radar Applications

A Compact and High Gain X/Ku Band Shared Aperture Antenna Array with Enhanced Inter-band and Cross-band Isolation

DESIGN AND ANALYSIS OF 1 &times; 8 RF POWER DIVIDER/COMBINER USING IMPEDANCE LIMITATION METHOD FOR C-BAND AIRBORNE SYNTHETIC APERTURE RADAR APPLICATIONS

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DESIGN AND ANALYSIS OF 1 × 8 RF POWER DIVIDER/COMBINER USING IMPEDANCE LIMITATION METHOD FOR C-BAND AIRBORNE SYNTHETIC APERTURE RADAR APPLICATIONS