Small balance-fed helical dipole antenna system for handset

Morishita, Hisashi; Kim, Yong-Ho; Furuuchi, H.; Sugita, Kouichi; Tanaka, Z.; Fujimoto, K.

doi:10.1109/vetecs.2000.851350

Cited by 4 publications

(3 citation statements)

References 1 publication

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“…It is usually placed in a dielectric material for miniaturization design and also for protection against corrosion. The NMHA embedded in a dielectric can be found in many applications such as portable equipments, access control and vehicle security [2][3][4].…”

Section: Introductionmentioning

confidence: 99%

Effects of Dielectric Materials on Impedance Characteristics of Embedded Small Normal Mode Helical Antenna

Liao¹,

Zhang²,

Liang³

et al. 2013

AMM

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The normal mode helical antenna (NMHA) is widely selected on RFID and wireless communication applications and often placed in a dielectric material for protection and miniaurization design. In this paper, the effects of dielectric materials with finite dimension on resonant frequency and impedance characteristics of embedded small NMHA were investigated. Three parameters related to the dielectric material were considered. Significant results were obtained by varying each one of these electrical dielectric parameters. It provides an effective guidance for designers to tune the antenna to desirable complex impedance when surroundded dielectric materials are employed.

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Section: Introductionmentioning

confidence: 99%

Effects of Dielectric Materials on Impedance Characteristics of Embedded Small Normal Mode Helical Antenna

Liao¹,

Zhang²,

Liang³

et al. 2013

AMM

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show abstract

“…In order to reduce the effects of the box, use of a dipole antenna has been proposed [5][6][7]. Since the dipole antenna does not need to be connected directly to the box as the ground, because the latter is not required for this antenna, leakage of RF current to the box can be suppressed [7].…”

Section: Introductionmentioning

confidence: 99%

“…Since the dipole antenna close to the box has reduced radiation resistance, a structure such as a folded configuration to increase the impedance [7] and a matching circuit are needed. Also, since usual wireless circuits are formed in an unbalanced mode, a balance-to-unbalance transformer (balun) is needed at the junction between the circuit and the dipole antenna, which has a balanced structure [6].…”

Section: Introductionmentioning

confidence: 99%

Characteristics of T‐type monopole antenna with parallel resonance mode

Sekine

Saito

2003

Electron. Comm. Jpn. Pt. I

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SUMMARYUse of dipole antennas for portable wireless transceivers has been attempted. In order to realize this application, it is necessary to add a matching network and a balun or a folded configuration. Hence, integration is found difficult. In this paper, a T-type monopole antenna with a parallel resonance mode is proposed. It is shown by simulation and measurement with a 2-GHz handset model that this antenna does not require any balun, is capable of self-matching, and can suppress unwanted radiation from the case as for a dipole antenna.

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