A Shared-Aperture Helical-Array Antenna Set at L and S Bands for Navigation Satellite Systems [Antenna Applications Corner]

Kumar, Sunil; Sanandiya, H.C.; Sharma, Rajeev; Singhal, Alok Kumar; Jangid, Dinesh Kumar; Gupta, R. C.

doi:10.1109/map.2016.2629181

Cited by 8 publications

(2 citation statements)

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“…The common bands for space borne SARs are the L, S, C, and X-bands. To minimize the volume and weight of the SAR antenna, a shared aperture configuration for dual-or multi-bands are required, which will share the sub-systems behind the arrays [2][3][4][5][6][7][8][9][10][11][12][13][14][15]. A shared aperture antenna SAA in L-and C-bands is proposed by Pokuls et al in [2] to fill the gap of shared aperture antenna technology using multilayer, which uses slots in the L-band and interlaced with microstrip patches operating in the C-band.…”

Section: Introductionmentioning

confidence: 99%

“…A concept of Fabry-Perot resonant cavity as a metasurface to reduce the complexity of the SAR antenna was presented by Qin et al in 2016 [14]. A shared aperture helical array antenna set at L-and S-bands and realized for navigation satellite systems with concentric phase center located at the two bands is proposed in [15]. So far, all the previous studies have multilayer configuration with microstrip technology for low profile, parabolic reflector antenna and helical antenna for dual band-and triple-band SAA system.…”

Section: Introductionmentioning

confidence: 99%

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A Single Layer S/X-Band Series-Fed Shared Aperture Antenna for Sar Applications

Kothapudi¹,

Kumar²

2017

PIER C

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Abstract-This paper presents our research work on designing a dual-band dual-polarized (DBDP) series-fed S/X-band shared aperture antenna (SAA) for synthetic aperture radar (SAR) applications. The proposed SAA DBDP X-band antenna is designed with the concept of series-fed 4-group 2 × 2 planar arrays with high impedance microstrip line feeding in both vertical and horizontal polarizations. By etching out the inner edge elements from 2 × 2 X-band subarrays in all the four-groups, the Sband element could be accommodated. The design evolution stages have been presented. The S-band (3.2 GHz) is best suited for volumetric soil moisture estimation using SAR and X-band (9.3 GHz) best suited for surveillance SAR applications and grain size estimation. To verify the antenna design concept, a prototype is fabricated and measured with both S-parameters and radiation characteristics including gain measurements. The antenna with reflection coefficient |S 11 | < −10 dB has an impedance bandwidth 3.12-3.42 GHz (9.3% BW) in S-band and 9.2-9.36 GHz (1.72% BW) in X-band. The measured isolation lS21l between two different bands in the same polarization is better than 25 dB, and the isolation between two different bands in two orthogonal ports is better than 30 dB. Measured gain of the antenna at S-band is better than 8.5 dBi at V-port and H-port, and X-band is better than 11 dBi at either port. Measured side-lobe level (SLL) at S-band is better than −17 dB at either port, and X-Band is better than −20 dB at either port. The overall size of the S/X-DBDP SAA is 100 × 100 × 1.6 mm 3 . Measured results of the S/X-DBDP SAA show good agreement with the finite integration technique (FIT) based computer simulation technology (CST) microwave studio.

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