A miniaturized antenna for 2G/3G frequency‐band applications

Borowiec, Robert; Słobodzian, Piotr

doi:10.1002/mop.21362

Cited by 7 publications

(3 citation statements)

References 2 publications

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“…A model DPX202690DT diplexer manufactured by TDK Corporation, which has a low insertion loss of 0.24 dB from 704 to 960 MHz, 0.38 dB from 1710 to 2170 MHz, and 0.83 dB from 2170 to 2690 MHz, was used in the circuit board to combine the two signals of low and high bands. The practical internal antenna design of compact size is for multiband operation and used in 2G/3G/4G communication system [11,12]. In order to enhance the antenna performance, two ground regions are removed from the printed circuit board under the antenna area.…”

Section: Antenna Designmentioning

confidence: 99%

A Compact Experimental Planar Antenna with a USB Connector for Mobile Phone Application

Lin

Tiong

2015

International Journal of Antennas and Propagation

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A practical antenna design combined with a universal serial bus (USB) connector in close vicinity is proposed. In the proposed arrangement, the antenna unit consisted of two planar inverted F antennas (PIFAs) placed on the two sides of the USB connector. The antenna is located at the bottom of the mobile phone to avoid the crowded space on the top side of the phone where various mobile phone accessories are usually assigned. A diplexer is incorporated in the unit to alleviate the adverse effect of the metal USB connector on the radiating efficiency of the antenna. A prototype antenna was fabricated and tested and showed good coverage for GSM850/900/1800/1900, UMTS2100, and LTE700/2500 multibands operation. The overall performances demonstrated the good design of the proposed unit for mobile phone application.

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Section: Antenna Designmentioning

confidence: 99%

A Compact Experimental Planar Antenna with a USB Connector for Mobile Phone Application

Lin

Tiong

2015

International Journal of Antennas and Propagation

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“…The conventional capacitive feed mainly has a coupling strip or coupling portion only, and with the capacitive feed, widened bandwidth in the lower band (900 MHz band) of the antenna [16] or reduced size of the antenna [17,18] has been demonstrated. In [5], by using a coupling stub as the capacitive feed, two wide operating bands are achieved to cover GSM850/900/1800/1900 quad-band operation for the loop antenna with an occupied volume of 3.4 cm 3 .…”

Section: Seven-band Surface-mount Loop Antenna With a Capacitively Comentioning

confidence: 99%

Seven‐band surface‐mount loop antenna with a capacitively coupled feed for mobile phone application

Wong

2008

Micro & Optical Tech Letters

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conical beam patterns was characterized and verified with measurements and shown to have acceptable axial ratio. The present antenna design can be used as a good candidate for applications in short-range wireless communication systems, particularly wireless sensor networks, where the conical beam will give advantages of energy saving and reduced co-channel interference. Other applications could include indoor WLAN antennas for mounting on ceilings or other horizontal surfaces. Recently, a variety of multiband loop antennas for wireless wide area network (WWAN) operation in the mobile phone have been demonstrated [1][2][3][4][5][6][7]. These loop antennas are attractive for mobile phone applications in part, because their excited surface current paths are in a closed form, which is different from the conventional mobile phone antennas such as the monopoles or planar inverted-F antennas (PIFAs), whose excited surface current paths are in an open form [8]. Hence, the possible coupling between the loop antenna and the system ground plane of the mobile phone can be much smaller than that of the conventional mobile phone antennas. In this case, the variations in the dimensions of the system ground plane will show smaller effects on the performances of the loop antenna. For the reported multiband loop antennas for mobile phone applications [1][2][3][4][5][6][7], most of them use a direct feed, and the obtained operating bands cover several of the GSM850 (824 -894 MHz), GSM900 (890 -960 MHz), GSM1800 (1710 -1880 MHz), GSM1900 (1850 -1990, and UMTS (1920( -2170 bands for WWAN operation. In this article, we present a surfacemount loop antenna with a capacitively coupled feed for achieving seven-band operation covering all the five operating bands for WWAN operation, the 2.4-GHz band (2400 -2484 MHz) for wireless local area network (WLAN) operation, and the 2.5-GHz band (2500 -2690 MHz) for worldwide interoperability for microwave access (WiMAX) operation [9 -15]. That is, WWAN/WLAN/ WiMAX multinetwork operation can be achieved for the proposed antenna. SEVEN-BAND SURFACE-MOUNT LOOP ANTENNA WITH A CAPACITIVELY COUPLED FEED FOR MOBILE PHONE APPLICATIONThe capacitively coupled feed applied in the proposed loop antenna comprises a coupling strip and a tuning strip, which is different from the conventional capacitive feed that has been studied for internal mobile phone antennas [5, 16 -18]. The conventional capacitive feed mainly has a coupling strip or coupling portion only, and with the capacitive feed, widened bandwidth in the lower band (900 MHz band) of the antenna [16] or reduced size of the antenna [17,18] has been demonstrated. In [5], by using a coupling stub as the capacitive feed, two wide operating bands are achieved to cover GSM850/900/1800/1900 quad-band operation for the loop antenna with an occupied volume of 3.4 cm 3 .In the proposed design, the loop antenna is formed by mounting a meandered loop strip onto the surfaces of a foam base of 60 ϫ 10 ϫ 3 mm 3 (1.8 cm 3 ) only. The antenna is then surface-mounted ...

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“…The large bandwidth at 900 MHz for the antenna's lower band is achieved owing to the use of the coupling feed. Compared to the use of the direct contact feed for the conventional PIFA, the use of the coupling feed contributes additional capacitance to the antenna's input impedance [11][12][13][14], which not only compensates for the high input inductance of the antenna but also introduces additional resonances (zero reactance) at around 900 MHz. This behavior leads to a dual-resonance excitation for the antenna's lower band, hence a widened operating band covering GSM850/900 operation is obtained.…”

Section: Introductionmentioning

confidence: 99%