Low profile dual-band-balanced handset antenna with dual-arm structure for WLAN application

Alhaddad, A. G.; Abd‐Alhameed, Raed A.; Zhou, Dawei; See, Chan Hwang; Elfergani, Issa; Excell, Peter S.

doi:10.1049/iet-map.2010.0219

Cited by 18 publications

(7 citation statements)

References 10 publications

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“…The hyperbolic functions sinh γl and cosh γl can be given by cosh 2 γl − sinh 2 γl = 1 and Eq. (19). Consequently, the ABCD-matrix of the jig can be written as…”

Section: Calibration Methods Of a Measurement Jigmentioning

confidence: 99%

“…For example, an asymmetric antenna was measured by using the S-parameter method and accurate results were shown for a wide range of bandwidths in [17]. An offset fed dipole antenna [18], RFID tags with asymmetric configurations [10], [12], [13], [18], and an antenna on a small housing [19] were also measured successfully by using the S-parameter method.…”

Section: Introductionmentioning

confidence: 99%

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S-Parameter Method and Its Application for Antenna Measurements

Sakamoto

Fukasawa

2014

IEICE Trans. Commun.

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SUMMARYThis paper focuses on the S-parameter method that is a basic method for measuring the input impedance of balanced-fed antennas. The basic concept of the method is summarized using the two-port network, and it is shown that the method can be enhanced to the unbalanced antennas using a formulation based on incident and reflected waves. The compensation method that eliminates the influence of a measurement jig and the application of the S-parameter method for the measurement of a radiation pattern with reduced unbalanced currents are explained. Further, application of the method for measuring the reflection and coupling coefficients of multiple antennas is introduced. The measured results of the input impedance of a dipole antenna, radiation patterns of a helical antenna on a small housing, and S-parameters of multiple antennas on a small housing are examined, and the measured results obtained with the S-parameter method are verified.

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“…The hyperbolic functions sinh γl and cosh γl can be given by cosh 2 γl − sinh 2 γl = 1 and Eq. (19). Consequently, the ABCD-matrix of the jig can be written as…”

Section: Calibration Methods Of a Measurement Jigmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

S-Parameter Method and Its Application for Antenna Measurements

Sakamoto

Fukasawa

2014

IEICE Trans. Commun.

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“…From [23], stair case errors [24] from FDTD can be mitigated by using a finite element method (FEM), but this method requires high computational resources. The method in [21] was extended to include the analysis of wide band [25] and dual-band [26] antenna responses using an impedance interpolation method [26] to minimize the computation time on the MoM side.…”

Section: Introductionmentioning

confidence: 99%

“…More recently, the works [21,25,26] have been extended by embedding sub-gridding inside an inhomogeneous human body model when the source excitation is a short-range radio frequency identification (RFID) antenna at 900 MHz in the UHF band [27]. The use of sub-gridding in the hybrid MoM-FDTD method ensures that transitions are as reflection-less as possible in order to provide specific animated display movements of the electric and magnetic fields in both the sub-gridded region and main grids.…”

Section: Introductionmentioning

confidence: 99%

Hybrid Computational Scheme for Antenna-Human Body Interaction

Ramli¹,

Abd‐Alhameed²,

See³

et al. 2013

PIER

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Abstract-A new hybrid method of moments (MoM)/finite-difference time-domain (FDTD), with a sub-gridded finite-difference timedomain (SGFDTD) approach is presented. The method overcomes the drawbacks of homogeneous MoM and FDTD simulations, and so permits accurate analysis of realistic applications. As a demonstration, it is applied to the short-range interaction between an inhomogeneous human body and a small UHF RFID antenna tag, operating at 900 MHz. Near-field and far-field performance for the antenna are assessed for different placements over the body. The cumulative distribution function of the radiation efficiency and the absorbed power are presented and analyzed. The algorithm has a five-fold speed advantage over fine-gridded FDTD.

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“…This provides the impetus for wideband and multiband baluns to cover all or parts of these frequency bands, leading to compact, low cost, accommodating-multiple-band systems.Baluns are significant elements in several modern wireless communication systems such as balanced mixers [1], push-pull amplifiers [2], passive filter [3] and also commonly exploited to support the feeding network of two wires balanced antennas whereby the balanced current should be on each arm. This will help to preserve balanced radiation patterns [4,5].To meet the requirements of most contemporary wireless communication, size reduction and bandwidth enhancement are considered as the most challenging task that balun designers are facing. In particular, special attention is given to balun designs which can be integrated on the same substrate with compact antennas for use in mobile/portable applications.Numerous syntheses of balun structures have emerged and been presented for wideband applications with the aim of supporting the developing broadband technologies [6][7][8][9][10][11][12][13][14][15][16][17][18].…”

mentioning

confidence: 99%

A Compact and Broadband Balun Design for Lte Applications

Elfergani¹,

Hussaini²,

Rodrı́guez³

et al. 2016

PIER C

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In this paper, a compact wideband planar balun is studied and investigated. The proposed balun comprises a broadband Wilkinson divider followed by non-coupled lines to attain wideband 180 • phase shift. Due to the inherent broadband characteristics of the proposed structure, good performance is accomplished in terms of phase and amplitude balance. The balun is optimally designed and validated by experiments. Both measured and computed results have shown a return loss better than −10 dB, an insertion loss around of −3.15 dB with a maximum absolute phase and amplitude imbalance around 2.5 • and 0.2 dB over frequency range from 700 to 3200 MHz. Practical and computed results of the present balun are in good agreement. INTRODUCTIONVarious communication systems emerged in the last decade due to the rapid development of wireless communication systems to satisfy the increasing demand of service and transmission speed. Different frequency bands are employed in these systems, such as the LTE 700/2600 MHz, GSM 900/1800 MHz, WLAN 2400/5200/5800 MHz and WiMax 3500/5500 MHz. This provides the impetus for wideband and multiband baluns to cover all or parts of these frequency bands, leading to compact, low cost, accommodating-multiple-band systems.Baluns are significant elements in several modern wireless communication systems such as balanced mixers [1], push-pull amplifiers [2], passive filter [3] and also commonly exploited to support the feeding network of two wires balanced antennas whereby the balanced current should be on each arm. This will help to preserve balanced radiation patterns [4,5].To meet the requirements of most contemporary wireless communication, size reduction and bandwidth enhancement are considered as the most challenging task that balun designers are facing. In particular, special attention is given to balun designs which can be integrated on the same substrate with compact antennas for use in mobile/portable applications.Numerous syntheses of balun structures have emerged and been presented for wideband applications with the aim of supporting the developing broadband technologies [6][7][8][9][10][11][12][13][14][15][16][17][18]. The most popular types of wideband baluns include the planar marchand baluns [6,7], broadband balun based on composite right/left-handed transmission line [8,9], three-line balun with wide bandwidths using exact synthesis designed as in [10], balun with multi-sections coupled-lines demonstrated in [11], a CPW balun using a multistage Wilkinson power divider for bandwidth improvement purpose [12], and the wideband balun design utilizing Wilkinson divider followed by Lange couplers for phase shifting was investigated in [13]. In [14], a wideband structure is modelled using a three-section Wilkinson divider assembly and two 3-dB quadrature couplers. Furthermore, designing multi-layered wideband baluns to operate in the C-and

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Low profile dual-band-balanced handset antenna with dual-arm structure for WLAN application

Cited by 18 publications

References 10 publications

S-Parameter Method and Its Application for Antenna Measurements

S-Parameter Method and Its Application for Antenna Measurements

Hybrid Computational Scheme for Antenna-Human Body Interaction

A Compact and Broadband Balun Design for Lte Applications

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