Low‐profile, small‐size, wireless wide area network handset antenna close integration with surrounding ground plane

A compact reconfigurable coupled‐fed loop antenna of the mobile handset for multiband long‐term evolution (LTE)/wireless wide area network operation is presented. The antenna volume is 5 × 10 × 30 mm3 only, while the protruded ground has a width of 30 mm for mounting electronic components. The proposed antenna is consisted of a loop strip and a driven strip. Through the driven strip capacitively coupled to the loop strip, the antenna can generate a 0.25‐wavelength loop resonant mode to form the antenna's lower band to cover the GSM850/900 bands (824–960 MHz). The simple driven strip is also an efficient radiator to excite a resonant mode for the antenna's upper band to cover the GSM1800/1900/WCDMA Band1 bands (1710–2170 MHz). Moreover, when the chip inductor connected to the loop strip has been adjusted from 0 to 12 nH, the antenna's lower band can be shifted to lower frequency and cover the LTE Band17 band (704–746 MHz) and the antenna's upper band is not varied. This tunable technique can allow the loop antenna to cover more operating bands without adding the antenna volume. Detailed operating principle and performances of the proposed antenna are discussed in this article. © 2014 Wiley Periodicals, Inc. Microwave Opt Technol Lett 56:2687–2691, 2014

Section: Proposed Tunable Coupled‐fed Loop Antennamentioning

confidence: 89%

Small‐size adjustable LTE/WWAN coupled‐fed loop antenna for mobile handset applications

Chang

Huang

Wei

et al. 2014

“…The wideband internal planar antenna printed on the circuit board directly is promising for applications of thin-profile mobile phones since it is easy to fabricate and occupies a smaller space compared to the antenna whose structure is three-dimensional. [1][2][3][4][5][6] Some design schemes for internal planar antennas of mobile phones have been presented by researchers, [7][8][9][10][11][12][13][14][15][16] but only a part of these can cover LTE/WWAN eight-band completely, and they all occupy a relatively large area. [10][11][12][13][14][15][16] A T-shape monopole antenna with a size of 17 × 58 mm 2 was presented in ref.…”

Section: Introductionmentioning

confidence: 99%

Compact monopole with a band‐stop matching circuit for LTE/WWAN smartphone

Shen

Zhang

Weng

et al. 2018

An LTE/WWAN monopole antenna with a compact size of 12.5 × 28.7 mm2 for smartphone applications is designed. The antenna is formed by an L‐shape driven branch, a parasitic shorting branch, and a band‐stop matching circuit. By capacitive coupling and loading a matching circuit, the antenna generates four resonant modes in the working bands. The band‐stop matching circuit is applied to enlarge the bandwidth of the low working band. The measured −6 dB impedance bandwidth of the presented antenna ranges from 683 MHz to 962 MHz and from 1632 MHz to 2710 MHz, covering LTE/WWAN eight‐band operation. Acceptable radiation performances are achieved over the working bands. The measured efficiencies are 45.4%‐61.2% and 44.5%‐66.4% and the measured gains are −0.6 dBi‐2.0 dBi and 0.07 dBi‐2.69 dBi in the low and high working band, respectively.

“…Recently, it has been shown that by applying a parallel‐resonant (PR) spiral slit, a small‐size planar tablet computer antenna can provide two wide operating bands to cover the 824–960 and 1710–2170 MHz for penta‐band wireless wide area network (WWAN) operation [1]. The applied PR slit generally does not increase the size of the antenna, and the wideband operation is obtained by generating a parallel resonance [2–7] at about 1.2 GHz, higher than the antenna's desired lower band, to cause a new resonance occurred inside the desired lower band and nearby the originally excited resonant mode of the antenna at about 850 MHz. This feature leads to a dual‐resonance characteristic obtained for the antenna's lower band, making it capable of wideband operation to cover the desired 824–960 MHz band with a small antenna size.…”

Section: Introductionmentioning

confidence: 99%

“…This feature leads to a dual‐resonance characteristic obtained for the antenna's lower band, making it capable of wideband operation to cover the desired 824–960 MHz band with a small antenna size. To achieve such a parallel resonance, the technique of using a band‐stop circuit which comprises a chip inductor and a chip capacitor connected in series [2–5] or using a distributed band‐stop circuit which comprises a printed shorted strip to closely couple with the antenna's main radiator [6, 7] has been applied. In the latter case, the printed shorted strip contributes an equivalent inductance to perform as a printed inductor, whereas the coupling between the shorted strip and the antenna's main radiator contributes an equivalent capacitor to perform as a printed capacitor, both the printed inductor and capacitor formed into a printed PR circuit for the antenna to generate a parallel resonance at the desired frequency.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

WWAN printed monopole slot antenna with a parallel‐resonant slit for tablet computer application

Lin

2012

Self Cite

The use of a parallel‐resonant (PR) slit for dual‐band bandwidth enhancement of a small‐size printed monopole slot antenna to achieve the wireless wide area network operation in the tablet computer is demonstrated. The antenna is easy to fabricate by printing on a thin FR4 substrate of size 10 × 45 mm2. The PR slit, mainly configured as a spiral shape to occupy a small area of about 6.5 × 6.5 mm2 on the FR4 substrate, generates two parallel resonances at about 1.2 and 2.5 GHz to, respectively, result in dual‐resonance excitation of the quarter‐wavelength and half‐wavelength modes of the monopole slot at about 0.9 and 1.9 GHz. In this case, two wide operating bands are obtained to, respectively, cover the 824–960 and 1710–2170 MHz bands. That is, with the dual‐band bandwidth enhancement contributed by the PR slit, the proposed antenna can cover the GSM850/900/1800/1900/UMTS bands with a small planar size. Details of the proposed antenna are described in the article. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:40–45, 2013; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.27273