Balance-fed L-type loop antenna system for handset

Morishita, Hisashi; Furuuchi, H.; Fujimoto, K.

doi:10.1109/vetecf.1999.801482

Cited by 11 publications

(6 citation statements)

References 2 publications

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“…Some previous studies have aimed to mitigate these effects through parametric optimization [2], ground plane current reduction [3], and adaptive matching [4]. However, there is no method to design antennas in the presence of lossy dielectrics that shows where, and how, to place antenna feeding elements to obtain low correlation and high efficiencies.…”

Section: Design Of Mimo Terminal Antennas With User Proximity Using Cmentioning

confidence: 99%

Design of MIMO terminal antennas with user proximity using characteristic modes

Miers

Lau

2017

2017 11th European Conference on Antennas and Propagation (EUCAP)

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Abstract-Although the classical Theory of CharacteristicModes allows an arbitrary structure to be analyzed prior to the implementation of physical feeds, structures containing dielectrics have so far received very little attention. Recently, a mesh perturbation method is proposed to remove internal resonances from the characteristic mode (CM) solution for lossy dielectrics obtained using the computationally efficient surface integral equation. Herein this method was applied to extract the CMs of a lossy structure consisting of a terminal chassis held in a user hand. These modes were then individually analyzed and a subset was chosen to design a MIMO antenna with not only very low correlation, but also low hand-induced losses.

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Section: Design Of Mimo Terminal Antennas With User Proximity Using Cmentioning

confidence: 99%

Design of MIMO terminal antennas with user proximity using characteristic modes

Miers

Lau

2017

2017 11th European Conference on Antennas and Propagation (EUCAP)

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“…The ground plane effects become much severer when the size of the ground plane is reduced. This has been one of the most challenging design issues in small antennas [59]. The proposed notched small printed UWB antenna achieved a great reduction of the effects caused by the changes in ground plane [60].…”

Section: ⅱ Key Milestones Of Planar Uwb Antenna Designmentioning

confidence: 99%

Development of Ultra-Wideband Antennas

Chen¹

2013

Journal of electromagnetic engineering and science

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The ultra-wideband (UWB) spectrum available for commercial applications has offered us an opportunity to achieve high-speed wireless communications and high-accuracy location applications. As one of key research areas in UWB technology, a lot of innovative broadband and miniaturization techniques for UWB antennas have been greatly invented and developed for years. This paper reviews the development of UWB antenna design in the past decade. Starting with a brief introduction of the specific requirements and promising applications of UWB systems, the unique design challenges of UWB antennas are highlighted. Next, the important milestones of UWB antenna designs are briefed. After that, a variety of planar UWB antennas invented for broadband operation, miniaturization, and multiple functions are introduced. Last, the comments on the development of UWB antennas in future are shared.

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“…On the other hand, the use of loop antennas, which are expected to be broadband, is possible [1][2][3][4][5][6][7]. In general, the loop antenna becomes resonant when the element length is about 1.1 to 1.2 wavelengths when the input impedance is a pure resistance of about 150 Ω.…”

Section: Introductionmentioning

confidence: 99%

“…However, this situation cannot be directly matched to the characteristic impedance of a coaxial cable, which is 75 or 50 Ω. One solution is the inclusion of parasitic elements and a supplementary loop [2][3][4]7]. In Ref.…”

Section: Introductionmentioning

confidence: 99%

Development of tabular broadband antenna for UHF‐TV

Okano

2003

Electron. Comm. Jpn. Pt. I

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SUMMARYA tabular loop antenna is proposed that can be matched to the characteristic impedance of a coaxial cable without using complex parasitic elements or expensive matching elements while maintaining the broadband character and superior gain of the loop antenna. Specifically, modification of the aperture shape inside the loop is attempted without changing the external shape. In this way, the control of the input impedance becomes possible and the bandwidth for VSWR ≤ 2 can reach about 40% at the center frequency of 620 MHz for UHF-band TV. An antenna with a unidirectional radiation pattern with a reflector was fabricated for trial and was studied both by experiments and by FDTD analysis. It was confirmed that the bandwidth for VSWR ≤ 2 reaches about 50% at 620 MHz. Further, with regard to the dynamic gain, a stable gain of 7.6 to 8.2 dBi was attained for the entire UHF band. This antenna will be useful for ground wave digital broadcasting.

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Balance-fed L-type loop antenna system for handset

Cited by 11 publications

References 2 publications

Design of MIMO terminal antennas with user proximity using characteristic modes

Design of MIMO terminal antennas with user proximity using characteristic modes

Development of Ultra-Wideband Antennas

Development of tabular broadband antenna for UHF‐TV

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