Design of a small size dielectric loaded helical antenna for satellite communications

Niow, C. H.; Mouthaan, Koen; Coetzee, Jacob; Hui, Hon Tat

doi:10.1109/apmc.2009.5385499

Cited by 13 publications

(6 citation statements)

References 5 publications

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“…Some of the main and more important elements to be reduced are the passive circuits of the handset front-end including the antenna. To reduce the antenna size, there have been many proposals, some of them resumed in [1], including the use of high dielectric constant laminates [2][3][4], meandering the elements of the antenna [5][6][7], fractal configurations [8][9][10], and the utilization of defected structures on and under the radiator [11,12].…”

Section: Introductionmentioning

confidence: 99%

Combination of stub-loaded and DMS techniques for planar monopole size reduction

Tirado‐Méndez

Jardón‐Aguilar²,

Linares-Miranda

et al. 2011

Int J RF and Microwave Comp Aid Eng

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In this study, a new technique is presented to reduce the dimensions of a strip line monopole antenna. A combination of stub-loaded and defected microstrip structure (DMS) methods are employed to design and built a prototype of a reduced planar monopole performing at UHF band (650 MHz). The method allows achieving a size reduction close to 50%, without modifying, significantly, the parameters of the antenna, including gain, radiation pattern, and polarization. The antenna is suitable to perform in personal communications and can be the basis to extrapolate the application to planar arrays. V C 2011 Wiley Periodicals, Inc. Int J RF and Microwave CAE 22:272-279, 2012.

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Section: Introductionmentioning

confidence: 99%

Combination of stub-loaded and DMS techniques for planar monopole size reduction

Tirado‐Méndez

Jardón‐Aguilar²,

Linares-Miranda

et al. 2011

Int J RF and Microwave Comp Aid Eng

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show abstract

“…5 The upper part of the Table is reserved for non-planar structures, whereas the lower part tabulates planar ones. Commenting on the tabulated results, it is first noted that quadrifilar helices (Niow et al, 2009;Rezaei, 2004) are wideband MGAs with clean circular polarization but they are also electrically large structures (ka > 2 rad). With proper structure modification and extensive dielectric loading they can be shrunk down to resonant size, that is, the electrical size of the half-wavelength monopole.…”

Section: Comparison With Existing Studiesmentioning

confidence: 99%

“…However, DL strengthens the near field, increases the quality factor, and reduces the operational bandwidth of the helix. (Niow et al, 2009) proposed a well-balanced combination of a modified helical antenna and DL to reduce antenna size. The modified structure was a backfire bifilar helical antenna (BBHA), which, unlike conventional helices, does not require a ground plane.…”

Section: Wire Antennas and Other Non-planar Structuresmentioning

confidence: 99%

Circularly Polarized Microstrip Antennas with Proximity Coupled Feed for Circularly Polarized Synthetic Aperture Radar

Baharuddin¹,

Sumantyo²

2011

Microstrip Antennas

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“…The experimental work of Niow, Ezanuddin and others [3][4][5][6] greatly reduce the physical dimensions of their helicals by using such materials such as Teflon with 2.1 r ε = or Barium Strontium Titanate (BST) with 100 r ε > . In our case, we did not have access to these materials.…”

Section: Methodsmentioning

confidence: 99%

“…To start, when operating in the axial mode, the range of the antennas circumference should follow the equation below. We can lower the operating frequency of a given sized helical by incorporating dielectric loading [3][4][5][6]. The following equation that relates the helical's operating frequency to the dielectric constant has been derived by Ezanuddin et al [4,6] and is given as 0 _ 1/3 2 8.553…”

Section: Theory Of Helical Antennasmentioning

confidence: 99%

Using Antenna Modeling Software and an RF Analyzer - A Study for Student Oriented Helical Antenna Projects

Crilly

Corbett

2017 ASEE Annual Conference &Amp; Exposition Proceedings

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Shane Corbett is currently a senior electrical engineering student at the US Coast Guard Academy. At an early age Shane found himself tinkering with electronics more than he would like to admit. His parents feared buying him new pieces of technology because inevitably they would end in pieces on a work bench next to a kid with a smile on. Once accepted to the USCGA Shane took his curiosity to the classroom and began his studies within the EE major. After an antennas course his junior year he found himself perplexed at the intricacies of this field of study. He then pursued an internship at MIT Lincoln Labs in the radar development group where he worked on helical antennas. Once back at the Academy for his senior year he took up time to dive further into helical design. Shane is looking forward to graduation and service in the Coast Guard aboard a cutter out of Pensacola, Fl.c American Society for Engineering Education, 2017 1 AbstractThis paper will present a student oriented, experimental approach to learning about the axial mode helical antenna. More specifically, students design, simulate, build, and then test a helical antenna. For simulations, we use software available in the public domain. Students then construct their antennas using readily available materials. Finally, they test their helical using a portable RF analyzer to measure the SWR and radiation pattern. The results show that the measured radiation pattern does indeed match their simulations. In both our empirical testing and simulations, students gain insight on how the three basic helical parameters of circumference, , C pitch angle, , α and number of turns, N , affects the antenna's performance. We also look at how dielectric loading can be employed to electrically lengthen an antenna causing for a drop in frequency with no change in physical size. Students also explore how spatial multiplexing can be achieved with differing polarizations (right hand vs left hand). Our approach allows students the opportunity to gain more insight into the characteristics of helical antennas so they can fully appreciate their capabilities as well as their limitations. Student assessment has shown that our approach greatly enhances understanding of helical antenna systems and has caused significant increase in student enthusiasm for selected topics in antennas.

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Design of a small size dielectric loaded helical antenna for satellite communications

Cited by 13 publications

References 5 publications

Combination of stub-loaded and DMS techniques for planar monopole size reduction

Combination of stub-loaded and DMS techniques for planar monopole size reduction

Circularly Polarized Microstrip Antennas with Proximity Coupled Feed for Circularly Polarized Synthetic Aperture Radar

Using Antenna Modeling Software and an RF Analyzer - A Study for Student Oriented Helical Antenna Projects

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