Diversity dual‐band planar inverted‐F antenna for WLAN operation

Chen, Yen‐Yu; Su, Saou‐Wen; Kuo, Yen‐Liang

doi:10.1002/mop.11020

Cited by 27 publications

(26 citation statements)

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“…For laptop computer applications, the WLAN MIMO operation requires a compact antenna array having enhanced isolation between the antennas and good radiation efficiencies for the antennas as well. The related isolation techniques that have been reported include the use of a T-shaped ground plane between the antennas [1], a ground wall and a connecting line added between the antennas [2], two PIFAs with their shorting strips or plates oriented to face each other [3], slot resonators embedded in the ground plane between the antennas to decrease the effects of the excited surface currents flowing from one port to another [4], and so on. However, the WLAN antennas applied in these studies may not be compact or suitable for the internal laptop computer antenna applications or the applied isolation techniques are not promising to achieve improved isolation in multiple operating bands.…”

Section: Introductionmentioning

confidence: 99%

High-isolation WLAN MIMO laptop computer antenna array

Jiang

Kao

2012

2012 Asia Pacific Microwave Conference Proceedings

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An isolation technique for two small-size WLAN MIMO laptop computer antennas covering the 2.4/5.2/5.8 GHz bands is presented. The WLAN MIMO antennas show measured isolation of better than 21 dB in the 2.4 GHz band and 32 dB in the 5.2/5.8 GHz bands. In addition to enhanced isolation, good antenna efficiencies of better than about 70% and 90% respectively in the 2.4 GHz and 5.2/5.8 GHz bands are obtained for the two antennas. The two antennas are of a simple structure comprising a driven strip and a shorted strip, which provides two wide operating bands to cover the 2.4 and 5.2/5.8 GHz bands. Between the two antennas, there is an isolation element formed by a protruded ground plane and a spiral open slot embedded therein. The isolation element leads to enhanced isolation and good antenna efficiencies for the antennas. Index Terms -Mobile antennas, WLAN antennas, antenna isolation, MIMO antennas, laptop computer antennas.

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Section: Introductionmentioning

confidence: 99%

High-isolation WLAN MIMO laptop computer antenna array

Jiang

Kao

2012

2012 Asia Pacific Microwave Conference Proceedings

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“…Antenna 1 and 2 are also arranged to have their shorting arms facing to each other, which can decrease the antenna's near-field radiation in-between the two antennas and lead to smaller mutual coupling [3]. However, with a spacing (d) of 24 mm between the two antennas mounted along the top edge of a large ground plane in this study, there is large mutual coupling between the two antennas.…”

Section: Proposed Design Of Two Antennas With Improved Isolationmentioning

confidence: 95%

Isolation improvement of WLAN internal laptop computer antennas using dual-band strip resonator

Kang

2009

2009 Asia Pacific Microwave Conference

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A high-isolation two-antenna structure comprising two small-size uniplanar WLAN antennas and a dual-band strip resonator embedded in-between for laptop computer application is presented. The proposed design occupies a small planar size of 9 50 mm 2 when mounted above the top edge of the large supporting metal frame of the laptop display. The two WLAN antennas are coupled-fed printed PIFAs capable of covering 2.4/5.2/5.8 GHz band operation, each occupying a size of 9 13 mm 2 and both facing to each other back-to-back with a spacing of 24 mm (that is, the total length of the proposed two-antenna structure is 50 mm). The embedded strip resonator functions as a dual-band wavetrap over the 2.4 and 5.2/5.8 GHz bands to trap the antenna's near-field radiation between the two antennas, which effectively reduces the mutual coupling between the two antennas. Good measured isolation (S 21 < 18 dB) over the 2.4/5.2/5.8 GHz bands is obtained, which is acceptable for practical laptop computer applications. The proposed design works for the large groundplane condition in the laptop computer, different from many of the reported two-antenna designs working for the relatively much smaller groundplane conditions such as in the mobile phones and PC cards.

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“…The results clearly indicate that the case 1 arrangement shows optimal isolation between the two antennas; in this case, the isolation (S 21 ) is less than Ϫ20 dB for all operating frequencies over the GSM, DCS, and WLAN bands. This behavior is probably because the two integrated antennas in case 1 are arranged to be back to back with their shorting strips facing each other, such that better shielding effects between the two antennas are obtained [8,9].The isolation behavior between the two antennas with case 1 arrangement as a function of d is then studied. Figure 3 shows the measured and simulated reflection coefficients (S 11 for the GSM/ DCS antenna, S 22 for the WLAN antenna) and isolation (S 21 ) between the two antennas with d ϭ 11 mm.…”

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confidence: 97%

Integrated internal GSM/DCS and WLAN antennas with optimized isolation for a PDA phone

Chou

Tang

Yeh

2005

Microw. Opt. Technol. Lett.

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other two. Considering that radiation fog has the smallest particlesize distribution, our results should stand for this type of fog as well. Although we do not know the exact particle-size distribution of the fog in the measured link, the upslope fog is similar in formation to the advection fog; therefore, we also believe that, for this type of fog, the performance of the far-IR link should not be worse than those of the other two. Of course, present-day commercial technology still benefits shorter wavelengths, mostly due to the availability of low-cost sources and detectors. However, new technologies can produce competing devices for the far-IR window; thus our results demonstrate that it is worth working in the development of appropriate devices and systems because the optical channel indeed performs better at long wavelengths in most cases. ACKNOWLEDGMENTSThis work was supported by the Research and Development Center of Ericsson Telecomunicações S/A, Brazil, and C. P. Colvero acknowledges scholarship support from the Brazilian Agency CNPq. The authors acknowledge the Brazilian state companies TVE Brasil and Furnas Centrais Elétricas S/A for allowing the installation of the transmitters and receivers within their facilities. INTRODUCTIONDue to the recent successful deployment of wireless local area networks (WLANs) in numerous hotspots, it has become promising to integrate cellular and WLAN networks to provide ubiquitous or seamless data services for users [1, 2]. For this kind of integrated cellular/WLAN network application, it is expected that mobile phones or PDA phones capable of dual-network operation will become popular in the near future. For this promising application, many of the dual-network mobile or PDA phones are generally equipped with two antennas, one for cellular operation and another for WLAN operation. In this case, since there are limited spaces available inside the portable devices, isolation between the two antennas has become a critical issue. However, very little related information is available in the open literature.Recently, a study on the isolation between two promising internal antennas-one GSM/DCS (890 -960 MHz/1710 -1880 MHz) antenna and one 2.4-GHz (2400 -2484 MHz) WLAN antenna [3]-for a dual-network PDA phone has been presented [4]. The results have shown that with the GSM/DCS antenna fixed at the top edge of the system circuit board, optimized or nearoptimized isolation is achieved when the WLAN antenna is placed near the bottom edge of the system circuit board. In this study, the maximum isolation S 21 values over the GSM, DCS, and WLAN bands are less than Ϫ33.6, Ϫ27.9, and Ϫ33.0 dB, respectively, which are quite good for practical applications [4]. However, in this case, the two antennas need to be separated by a relatively large distance. In this paper, we present an isolation study that considers two promising internal GSM/DCS and WLAN antennas printed and integrated on a dielectric substrate. In the study, both of the GSM/DCS and WLAN antennas are printed PIFAs of compact...

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Diversity dual‐band planar inverted‐F antenna for WLAN operation

Cited by 27 publications

References 2 publications

High-isolation WLAN MIMO laptop computer antenna array

High-isolation WLAN MIMO laptop computer antenna array

Isolation improvement of WLAN internal laptop computer antennas using dual-band strip resonator

Integrated internal GSM/DCS and WLAN antennas with optimized isolation for a PDA phone

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