Wideband and compact horizontally polarized omnidirectional antenna using composite dipole elements

A compact horizontally polarized omnidirectional slot antenna with a wide working band is presented in this article. The proposed antenna consists of 4 shorter driven cross‐shaped slots, 4 longer parasitic cross‐shaped slots, and a feeding network. Four shorter slots, placed on the same side of a circular substrate, are fed by a feeding network printed on the other side with uniform phase and magnitude. To enhance the bandwidth of the antenna, 4 longer cross‐shaped slots are inserted between adjacent longer slots to produce an additional resonant frequency. All 8 slot radiators placed symmetrically along the circumference results in an omnidirectional horizontal polarized radiation pattern. By utilizing cross‐shaped slots, a compact size of 0.53λL × 0.53λL × 0.005λL (λL is the free space wavelength at the lowest operational frequency) is achieved. The prototype of the proposed antenna is fabricated and measured. The measured results reasonably agree with the simulated results. The measured working band for |S11|<–10dB is from 1.62 to 2.81 GHz which successfully covers the 1.7 to 2.7 GHz 2G/3G/LTE bands. The measured gain variation in azimuthal angle is <1.7 dB within 1.7 to 2.7 GHz, and the cross polarization level is <–27 dB in the horizontal plane.

Section: Resultsmentioning

confidence: 99%

“…To further improve the bandwidth of omnidirectional HP antenna, multi‐feed antennas including broadband feeding network are proposed . When compared with single feed loop antenna, multi‐feed omnidirectional HP antennas have wider operational bands.…”

Section: Introductionmentioning

confidence: 99%

A wideband compact horizontally polarized omnidirectional antenna for 2G/3G/LTE

Cai

et al. 2018

“…In addition, the RF energy in ambient atmosphere may come from any direction due to the unknown angle of incident RF signal and location of signal source. Therefore, the antenna with omnidirectional characteristic and stable radiation pattern is preferred to capture more RF energy . Furthermore, a fractal antenna is a better alternative for a compact potable electronic device .…”

Section: Introductionmentioning

confidence: 99%

An efficient fractal rectenna for RF energy harvest at 2.45 GHz ISM band

Shi

Fan

Jing

et al. 2018

A novel efficient rectenna is proposed in this paper for radio frequency (RF) energy harvest from ambience at 2.45 GHz ISM band. A compact fractal antenna is designed based on a Lévy C curve. The performance of antenna with the ground plane of the conventional geometry, the rectangular‐slot geometry and the newly designed geometry is investigated and compared. Besides, a typical rectifier with a 73‐degree radial stub matching network is presented. Simulation and experiment are performed to validate the performance of the presented rectenna. The results indicate that the antenna is characterized with a good matching characteristic with a stable omnidirectional radiation pattern. The rectifier has a relatively high efficiency of 30% under the low input power of −10 dBm. The measured maximum RF to DC conversion efficiency of the rectenna is 70% with the output voltage of 2.2 V at 0 dBm when the input power ranging from −20 dBm to 0 dBm.

“…Omnidirectional antennas are wildly used in the wireless communication systems, as they can provide omnidirectional radiations covering a large area . Several designs have been proposed for the omnidirectional antennas design, and monopole antenna is a common design.…”

Section: Introductionmentioning

confidence: 99%

“…Omnidirectional antennas are wildly used in the wireless communication systems, as they can provide omnidirectional radiations covering a large area. [1][2][3] Several designs have been proposed for the omnidirectional antennas design, and monopole antenna is a common design. However, conventional monopole antenna has a profile of k 0 /4 (k 0 is the wavelength of the center frequency in free space), which is too high for low profile and conformal configuration systems.…”

Section: Introductionmentioning

confidence: 99%

A multi-mode wideband omnidirectional monopolar patch antenna for indoor wireless communication systems

Liu

Cai

Zhao

et al. 2017

A wideband omnidirectional monopolar patch antenna merged multi‐mode with a simple structure is proposed in this article. The antenna consists of a circular patch and a concentric annular ring, which is coupled‐fed by a T‐shape monopole at its center. A wideband performance is achieved by converging multi‐mode: TM02 mode of the circular patch, TM02 mode of the annular ring and monopole mode of the T‐shape monopole. The measured results show that the proposed antenna has an impedance bandwidth of 55.3% from 4.45GHz to 7.85GHz. All of the three resonant modes lead to conical radiation patterns in the elevation plane and omnidirectional radiation patterns in the azimuth plane, and the measured peak gain varies from 6.1 to 10 dBi within the operating band, which verifies it can be a good choice for indoor wireless communication systems.