Very‐small‐size folded loop antenna with a band‐stop matching circuit for WWAN operation in the mobile phone

Chi, Yun‐Wen; Wong, Kin‐Lu

doi:10.1002/mop.24147

Cited by 42 publications

(50 citation statements)

References 11 publications

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“…Promising on-board printed antennas with a small printed area on the system circuit board for WWAN (wireless wide area network) operation covering the GSM850/900 bands (824-960 MHz) and GSM1800/1900/UMTS bands (1710-2170 MHz) in the mobile phone have also been reported very recently [6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24]. These on-board printed WWAN antennas include using the k/8 printed PIFA (planar inverted-F antennas) [6], k/8 printed monopole [11,12], k/4 printed slot [15][16][17][18], and k/4 printed loop [22][23][24] to achieve reduced antenna size yet wide operating bands.…”

Section: Introductionmentioning

confidence: 99%

Bandwidth enhancement of coupled‐fed on‐board printed PIFA using bypass radiating strip for eight‐band LTE/WWAN slim mobile phone

Chen

2010

Micro & Optical Tech Letters

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By connecting a bypass radiating strip to the radiating portion of a coupled‐fed on‐board printed PIFA (planar inverted‐F antenna), significant bandwidth enhancement can be obtained.The bypass radiating strip provides a bypass for the excited surface currents of the printed PIFA, which leads to more uniform surface current distributions on the printed PIFA. This behavior can result in slow variations in the antenna's input impedance over the operating bands, which makes it very promising to achieve improved impedance matching; thus, enhanced bandwidths of the printed PIFA are obtained. In this study, with a small footprint to be printed on the no‐ground portion of 15 × 48 mm2 in the system circuit board of the mobile phone, the proposed on‐board printed antenna is especially suitable for slim mobile phone applications and can generate two wide operating bands to respectively cover the LTE700/GSM850/900 operation (698–960 MHz) and the GSM1800/1900/UMTS/LTE2300/2500 operation (1710–2690 MHz). The proposed antenna held by the user's hand and attached to the user's head is also tested for its SAR values over the eight operating bands. Measured and simulated results are presented. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52: 2059–2065, 2010; Published online in Wiley InterScience (www.interscience. wiley.com). DOI 10.1002/mop.25406

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Section: Introductionmentioning

confidence: 99%

Bandwidth enhancement of coupled‐fed on‐board printed PIFA using bypass radiating strip for eight‐band LTE/WWAN slim mobile phone

Chen

2010

Micro & Optical Tech Letters

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“…To suppress or decrease the upper ground plane effects on the performances of the internal WWAN antenna, we propose in this article to introduce an equivalent band-stop circuit [12,13] formed by distributed elements at the hinge of the clamshell mobile phone to create a parallel resonance at about 900 MHz, which results in high impedance seen at the hinge into the upper ground plane for the 900 MHz band. This proposed design is related to the idea proposed in [7,14] in which however, no detailed results are presented.…”

Section: Introductionmentioning

confidence: 99%

Internal wireless wide area network clamshell mobile phone antenna with reduced ground plane effects

2010

Micro & Optical Tech Letters

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In addition, parametric studies were performed to quantify the effects of height h between the radiation patch and the ground plate of the antenna on S 11 . From Figure 6, it can be seen that the whole resonant frequency decreases with the increase of h, which owing to the increased equivalent electric length of the antenna.The radiation pattern of the fabricated antenna was measured at 2.45, 5.2, and 5.75 GHz, which are shown in Figures 7-9, respectively. It can be seen that the radiation patterns at the three resonant frequencies showed omni-directional patterns in the x-y plane. At 5.75 GHz, the radiation pattern in the x-z plane was not exactly omni-directional; this is due to the effect of the ground plane. The peak gains of the antenna were 1.6 dBi at 2.45 GHz, 2.3 dBi at 5.2 GHz, and 4.4 dBi at 5.75 GHz. CONCLUSIONSA compact tri-band PIFA for WLAN and WiMAX applications has been proposed and the effects of dimensions have been studied. By using the F-T-shaped slots in the radiation patch and intro-ducing trapezoidal feeding plate, the three resonant modes are generated. The size of the fabricated radiation patch and ground plane are 25 Â 11 Â 8 mm 3 and 26 Â 40 mm 2 ; this is much smaller than a conventional inverted-F antenna. Because of its nearly omni-directional radiation pattern, the antenna has wide and potential applications for wireless communication applications.

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“…In the lower band, the first mode is identified as a quarter-wavelength loop mode of the antenna (see the surface current distribution at 850 MHz shown in Fig. 4), while the second one is owing to a new resonance at about 1020 MHz generated by a parallel resonance at about 1080 MHz contributed by the band-stop circuit [3], [4]. In the upper band, the two resonant modes are higher-order loop modes of the antenna, which are both identified as half-wavelength loop modes (one current null in the current distribution) as seen from the simulated surface current distributions at 1770 and 2080 MHz seen in Fig.…”

Section: Resultsmentioning

confidence: 99%

Penta-band WWAN handset antenna embedded in a small notch in the system ground plane

Chu

Kao

2012

Proceedings of the 2012 IEEE International Symposium on Antennas and Propagation

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An internal WWAN (824~960/1710~2170 MHz) handset antenna suitable to be embedded in a small notch of 35 × 6 mm 2 in the system ground plane of the handset is presented.The antenna occupies a small volume of 35 × 6 × 3 mm 3 or 0.63 cm 3 only. To fit in the small notch, a quarter-wavelength gapcoupled loop antenna is applied, which not only can be configured into a compact configuration but also can be in proximity to the surrounding ground plane. With the aid of a matching network, which is comprised of a series chip inductor and a band-stop matching circuit, two wide operating bands to respectively cover the GSM850/900 and GSM1800/1900/UMTS operation are obtained.

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Very‐small‐size folded loop antenna with a band‐stop matching circuit for WWAN operation in the mobile phone

Cited by 42 publications

References 11 publications

Bandwidth enhancement of coupled‐fed on‐board printed PIFA using bypass radiating strip for eight‐band LTE/WWAN slim mobile phone

Bandwidth enhancement of coupled‐fed on‐board printed PIFA using bypass radiating strip for eight‐band LTE/WWAN slim mobile phone

Internal wireless wide area network clamshell mobile phone antenna with reduced ground plane effects

Penta-band WWAN handset antenna embedded in a small notch in the system ground plane

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