Extremely low-profile helix radiating a circularly polarized wave

Nakano, Hisamatsu; Takeda, Hiroshi; Honma, Tetsuo; Mimaki, H.; Yamauchi, Junji

doi:10.1109/8.86872

Cited by 75 publications

(42 citation statements)

References 4 publications

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“…The former and latter, respectively, act as a CP wave exciter and a CP wave director. This means that CP wave radiation is obtained with a relatively small arm length (corresponding to a small number of turns [16]). …”

Section: A Helical Antenna Above a Flat Pec Reflector (Determinationmentioning

confidence: 99%

Effects on the radiation characteristics of using a corrugated reflector with a helical antenna and an electromagnetic band-gap reflector with a spiral antenna

Nakano

Hitosugi

Tatsuzawa

et al. 2005

IEEE Trans. Antennas Propagat.

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Abstract-An axial-mode helical antenna backed by a perfect electric conductor (PEC reflector) is optimized to radiate a circularly polarized (CP) wave, using the finite-difference time-domain method (FDTDM). After the optimization, the PEC reflector is replaced with a corrugated reflector. The effects of the corrugated reflector on the current distribution along the helical arm and the radiation pattern are investigated. A reduction in the backward radiation is attributed to the reduction in the current flowing over the rear surface of the corrugated reflector. A spiral antenna backed by a PEC reflector of finite extent is also analyzed using the FDTDM. As the antenna height decreases, the reverse current toward the feed point increases, resulting in deterioration of the axial ratio. To overcome this deterioration, the PEC reflector is replaced with an electromagnetic band-gap (EBG) reflector composed of mushroom-like elements. Analysis reveals that the spiral radiates a CP wave even when the spiral is located close to the reflector (0.06 wavelength above the EBG surface). The input impedance for the EBG reflector is more stable over a wide frequency band than that for the PEC reflector.Index Terms-Corrugated reflector, electromagnetic band-gap reflector, finite-difference time-domain method (FDTDM), helical antenna, spiral antenna.

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Section: A Helical Antenna Above a Flat Pec Reflector (Determinationmentioning

confidence: 99%

Effects on the radiation characteristics of using a corrugated reflector with a helical antenna and an electromagnetic band-gap reflector with a spiral antenna

Nakano

Hitosugi

Tatsuzawa

et al. 2005

IEEE Trans. Antennas Propagat.

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“…Now we array low-profile helice antenna [4], as shown in Fig. 3 The feed wire of each helix is inserted into the radial waveguide through a small hole and excited by a traveling wave flowing from the radial waveguide center (coaxial line) toward the waveguide edge.…”

Section: A Configuration Of Array Antennamentioning

confidence: 99%

“…A 2-turn helix of 4" pitch angle shows a bandwidth of 12% for a 3-& axial-ratio criterion. This paper is a sequel to a previous paper [l] and describes the application of the 2-turn low-pitch helix to an array antenna fed by a radial waveguide [3], [4]. The motivation to apply the helix to the array antenna comes from the requirement of developing a high-efficiency flat-type antenna for reception of the broadcasting satellite TV programs in Japan.…”

Section: Introductionmentioning

confidence: 99%

Low-profile helical array antenna fed from a radial waveguide

Nakano

Takeda

Kitamura

et al. 1992

IEEE Trans. Antennas Propagat.

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Abstract-A low-profile array antenna composed of 2-turn 4" pitch angle helices is designed for a frequency band of 11.7 GHz to 12.0 GHz. The feed wire of each helix is inserted into a radial waveguide through a small hole and excited by a traveling wave flowing in the transverse electromagnetic (TEM) mode between the two parallel plates of the waveguide. The measured aperture efficiency shows a maximum value of 77% for a beam radiated in the normal direction and 69% for a 30" beam tilt.

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“…The designs of helix antenna for achieving GSM/DCS dual-band operations for mobile handsets have recently received much attention because of its low profile and compact size. Many related designs have also been reported in the open literature [3]. A helix antenna with a uniform pitch angle can be turned to operate at single band [4].…”

Section: Introductionmentioning

confidence: 98%

A study on bandwidth enhancement of 900/1800 dual band LTCC chip antenna by using equivalent circuit analysis

Lee

Chen

2009

Int J RF and Microwave Comp Aid Eng

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In this article, low temperature cofired ceramic (LTCC) technology was used to realize the quarter of wavelength helical antenna instead of the quarter of wavelength monopole for achieving minimization of ceramic chip antenna (13 mm 3 5.25 mm 3 1.2 mm). The equivalent circuit of the helix-monopoles combination of chip antenna has been established successfully. Using circuit simulation on the equivalent circuit model we proposed, two extra parasitic monopole antennas were added into helix antenna to enhance the second mode bandwidth because of the presence of these two close modes. The measured performance of the dual band LTCC chip antenna with helix-three monopoles has been successfully predicted by using circuit simulation instead of EM simulation. The first and the second modes bandwidth of the dual band chip antenna can be achieved to 95 MHz (880-975 MHz) (meeting GSM band) and 300MHz (covering DCS and PCS band), respectively. The measured peak gains of this ceramic chip antenna are approximately 21.8 dB in low band and 0.6 dB in high band based on the 120 3 40 mm 2 ground size.

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Extremely low-profile helix radiating a circularly polarized wave

Abstract: It is revealed that the combination of low pitch and a small number of turns realizes a low-profile helix as a radiating element of circular polarization. A two-turn helix of 4" pitch angle shows a bsndwidtb of 12% for a 3 dB axial-ratio criterion.

Cited by 75 publications

References 4 publications

Effects on the radiation characteristics of using a corrugated reflector with a helical antenna and an electromagnetic band-gap reflector with a spiral antenna

Effects on the radiation characteristics of using a corrugated reflector with a helical antenna and an electromagnetic band-gap reflector with a spiral antenna

Low-profile helical array antenna fed from a radial waveguide

A study on bandwidth enhancement of 900/1800 dual band LTCC chip antenna by using equivalent circuit analysis

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