A band-switched resonant quadrifilar helix

Sainati, Robert; Groppelli, J.; Olesen, R.; Stanland, A.

doi:10.1109/tap.1982.1142892

Cited by 17 publications

(6 citation statements)

References 2 publications

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“…Figure 14 shows such a pattern as measured by Sainati [38]. Because the sea-surface re°ections arrive in the lower hemisphere, the lower hemisphere determines the multipath e®ect.…”

Section: Baseline Quadri¯lar Patternmentioning

confidence: 73%

Sea-Surface Specular Multipath for Surface-Level Antennas: Phase 1

Allen¹,

Goshorn²,

Zeidler³

et al. 2005

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Public reporting burden for the collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing the collection of information. A. A. Beex Virginia TechApproved for public release; distribution is unlimited. SSC San DiegoSan Diego, CA 92152-5001 Executive SummaryThis document describes a specular multipath simulation for antennas located close to a sea surface. The antennas are circularly polarized but the ray-trace implementation readily accommodates any other polarizations. The transmitted signal s T (t) arrives at the receiver's antenna along the direct path and from multiple re°ections o® the sea surface. The surface-level antenna turns the multipath into multiplicative noise|assuming the receiver is narrow band. Under this narrow-band assumption, the received signal s R (t) is approximated by modulating the transmitted signal s T (t) with this multiplicative noise:The multiplicative noise fa(t)g is determined by the sea surface, the elevation angle of the transmitted signal path, and the receiver's antenna. By sweeping over various realizations of the sea surfaces, elevation angles, and various antenna heights and speeds, the systems engineer can estimate sea-surface specular multipath e®ects on the surface-to-satellite link.iii

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“…Figure 14 shows such a pattern as measured by Sainati [38]. Because the sea-surface re°ections arrive in the lower hemisphere, the lower hemisphere determines the multipath e®ect.…”

Section: Baseline Quadri¯lar Patternmentioning

confidence: 73%

Sea-Surface Specular Multipath for Surface-Level Antennas: Phase 1

Allen¹,

Goshorn²,

Zeidler³

et al. 2005

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“…Several techniques have been reported by authors to increase the impedance and axial ratio performance of printed quadrifilar helix antenna [9][10][11][12] . Louvigne & Sharaiha 9 discusses the bandwidth enhancement technique of printed quadrifilar antenna and achieves bandwidth of 7% at L-Band frequency.…”

Section: Introductionmentioning

confidence: 99%

A Wide Beam Printed Quadrifilar Helix based Circularly Polarised Radiating Element for Electronically Steered Antenna

2021

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Wide beam and low axial ratio performance of printed quadrifilar antennas result in very attractive circularly polarised radiating element for wide scanned Electronically Steered Antenna. A compact printed quadrifilar Helix antenna (PQHA) has been designed and realised at S-Band frequency. Simulation and optimisation of designed antenna has been performed using ANSYS’s high frequency structure simulation (HFSS) software for its impedance, axial ratio (AR) performance and radiation characteristics. The developed circularly polarised antenna has 3-dB beam width of 130° and peak gain of 3.4dBic at 2.6 GHz. The developed antenna shows excellent AR performance over the frequency band as well as over the radiated beam. Half power axial ratio bandwidth of developed antenna is 27.4% (2.2 GHz - 2.9 GHz) while the impedance bandwidth is 32% (2.1 GHz - 2.9 GHz). Design has been validated through measured results. Designed wide band PQHA can be used as radiating element for electronically steered antenna for large beam steering application.

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“…To overcome the problems of multipath fading and polarization mismatch between ground antenna receivers and satellites, circularly polarized (CP) antennas exhibiting an excellent axial ratio over the operating band and over a wide beamwidth are then required [1][2][3][4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

A Broadband Printed Quadrifilar Helical Antenna With a Novel Compact Broadband Feeding Network

Yang¹,

Yan²,

Xu³

et al. 2014

PIER C

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Abstract-A broadband printed quadrifilar helical antenna (BPQHA) integrated with a broadband feeding network for satellite communications is proposed. Using a multiple arm technique, satisfactory antenna characteristics over a wide bandwidth are realized. To feed the antenna, a novel compact broadband feeding network composed of a frequency independent 180 • out-of-phase power divider, two Wilkinson power dividers and two broadband 90 • phase shifters is designed. The measured boresight gain remains positive with a reflection coefficient lower than −11 dB over a bandwidth of approximately 26%. The axial ratio is below 1.7 dB and the half-power beamwidth is more than 120 • over the same bandwidth. Details of the proposed antenna design are provided and discussed, as well as the experimental results.

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A band-switched resonant quadrifilar helix

Cited by 17 publications

References 2 publications

Sea-Surface Specular Multipath for Surface-Level Antennas: Phase 1

Sea-Surface Specular Multipath for Surface-Level Antennas: Phase 1

A Wide Beam Printed Quadrifilar Helix based Circularly Polarised Radiating Element for Electronically Steered Antenna

A Broadband Printed Quadrifilar Helical Antenna With a Novel Compact Broadband Feeding Network

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