A MNG-TL Loop Antenna Array With Horizontally Polarized Omnidirectional Patterns

Abstract-A planar monopole loaded with composite right/left-handed transmission line (CRLH-TL) for broadband LTE mobile phone is presented. The CRLH-TL with a propagation constant of zero is added to widen the input impedance bandwidth of the antenna. The proposed antenna covers the LTE700/2500/GSM850/900/1800/1900/UMTS2100 and WLAN2400 bands. Impedance bandwidths of VSWR < 2.5 (S 11 < −7 dB) ranging from 675 to 1010 MHz and 1690 to 2550 MHz are obtained. The size of the monopole is 60×16×1 mm 3 which is smaller than most of the LTE antennas. Detailed design considerations of the monopole are described. A prototype is fabricated and tested. Both simulated and experimental results are discussed.

Section: Antenna Designmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Small-Size Wideband Monopole Antenna With CRLH-Tl for Lte Mobile Phone

Luo¹,

Gong²,

Duan³

et al. 2014

“…Later, based on the metamaterial transmission line (MTL), a zeroth-order resonance (ZOR) antenna is proposed to generate vertically polarized field [8]. A horizontally polarized field can be obtained by a magnetic dipole, which is realized by an Alford loop antenna and its derivatives [9,10]. Generally, omnidirectional CP radiation is obtained by an appropriate combination of the two structures mentioned above.…”

Section: Introductionmentioning

confidence: 99%

Wideband Omnidirectional Circularly Polarized Patch Antenna With Multi-Resonant Structure

Yang¹,

Zhang²,

Ji³

et al. 2017

Abstract-A wideband omnidirectional circularly polarized (CP) patch antenna is proposed in this paper. The proposed antenna is composed of a disk-loaded coaxial probe and four pairs of modified Γ-shaped strips loaded with shorting pins. Each pair of modified Γ-shaped strips consists of an inner Γ-shaped strip and an outer Γ-shaped strip. The approach employed in this design for improving the operating bandwidth is to add an inner Γ-shaped strip and make it couple to the outer one. By introducing the two coupled Γ-shaped strips, two different monopole modes can be achieved simultaneously and controlled separately by two different corresponding parts of these two Γ-shaped strips, respectively, and they can be merged to realize a wide-band impedance matching. Meanwhile, two minimum axial ratio (AR) points around the resonances of the antenna are excited by the coupled Γ-shaped strips, and they can be reallocated closely to each other for wide AR bandwidth. The measured results show that the proposed design has a 10-dB impedance bandwidth of 22.7% (2.26-2.84 GHz), 3-dB AR bandwidth of 33.6% (2.1-2.95 GHz) and low profile of 0.1λ 0 (λ 0 is the free-space wavelength at center frequency). In addition, a parametric discussion is conducted to further verify the proposed design.

“…A HP omnidirectional antenna array using zero phase-shift-line loop elements is proposed in [11], its bandwidth covers a frequency range of 2.35-2.55 GHz or a percentage bandwidth of 8% and its peak gain is about 6 dBi. A HP Omnidirectional antenna array employing artificial mu-negative transmission line loop as its element is proposed in [12], which can operate over WLAN band of 2.3-2.6 GHz. However, none of the above-mentioned omnidirectional designs can provide an antenna that achieves high gain and broadband patterns simultaneously.…”

Section: Introductionmentioning

confidence: 99%

A Broadband Omnidirectional Antenna Array for Base Station

Wang¹,

Zhang²,

Jiang³

et al. 2014

Abstract-A high gain wideband antenna array with an omnidirectional radiation pattern is presented for base station. The antenna array is composed of four elements and a circular four-way power divider. The proposed planar antenna element consists of four pairs of arc dipoles and a balun, which can achieve a better impedance match and a wider frequency range. Furthermore, the conductor ground of the power divider with a larger size than the element is placed under the four antennas, which can also enhance the peak gain. The antenna array is simulated, fabricated and measured. The measurement results show that the proposed antenna array can achieve a bandwidth from 1.62 GHz to 2.43 GHz or a relative bandwidth of 39.4%. The antenna array has a peak gain of 6.4-7.2 dBi in the work band and obtains a radiation efficiency of 88%. The simulated and measured results show that the proposed antenna array is a good candidate as a base station antenna for GSM, PCS, and UMTS applications.