Monopole antenna

About: Monopole antenna is a research topic. Over the lifetime, 32295 publications have been published within this topic receiving 425364 citations. The topic is also known as: groundplane.

Latex based near-endfire wearable antenna backed by AMC surface

Abstract: A near-endfire, artificial magnetic conductor (AMC) backed wearable antenna is proposed in this paper for wireless body area networks operating in the 2.4 GHz ISM band. The bidirectional-endfire radiation pattern of Yagi-Uda latex antenna is changed to off-axis near-endfire radiation using an AMC reflector also printed on latex. The antenna is separated from upper AMC surface using flexible Styrofoam of thickness 0.044λo at 2.4 GHz for best compromise between keeping the antenna structure low-profile and achieving an off-axis beam tilt radiation of ~74° towards end-fire direction. 0° reflection phase AMC surface is proposed to reduce downward radiations and consequently improve the antenna tolerance to positioning on the human body, and reduce the specific absorption rate (SAR) level for 2.4 GHz frequency band gap. Antenna performance in terms of return loss, radiation efficiency, extent of frequency detuning, gain and SAR level are studied for free space as well as CST MWS tissue-equivalent voxel model for proposed antenna design. The Yagi-Uda antenna backed with AMC reflector demonstrates the measured return loss bandwidth of 40 MHz (2.43-2.47 GHz) and gain of -0.2 dBi in endfire direction with improved on-body radiation efficiency of 74.82 % and reduced peak SAR level of 1.24 W/kg for 10 g tissue for the compact overall flexible latex antenna volume of 0.4λo × 0.4λo × 0.076λo at 2.4 GHz.

High isolation design of a two-element planar UWB-MIMO monopole antenna

Abstract: Two-element ultra-wideband (UWB) multiple input and multiple output (MIMO) antennas are presented to obtain high isolation. The designed UWB-MIMO antennas are composed of two identical orthogonal antenna elements, and a defected ground structure with I-shaped slot and a pair of L-shaped stub are employed to get better isolation. Bandwidth of the proposed antennas range from 3.28 GHz-12 GHz. Also, the proposed antennas have isolations better than −18.6 dB. Moreover, an isolation of −20 dB is obtained within 3.73 GHz–10.26 GHz. The results show that the proposed UWB-MIMO antennas have wide bandwidth and high isolation performance.

UWB monopole antenna with multiple fractal slots for band-notch characteristic and integrated Bluetooth functionality

Abstract: This article presents the design of compact microstrip-fed modified half annular-shaped planar monopole antenna for ultra-wideband (UWB) (3.1–10.6 GHz) application. An electromagnetically coupled circular-shaped parasitic patch is introduced at the backside of the substrate to enhance the bandwidth of the whole antenna by shifting the lower frequency band. A rectangular slot-embedded ground plane at the bottom surface of the substrate improves the impedance bandwidth with excellent matching characteristics for the entire design frequency band. In addition to this, a half Minkowski fractal slot, a hybrid fractal slot, and Sierpinski arrowhead curve fractal slot are coupled to the feed line individually such that three UWB antennas with band-notched characteristic are realized that mitigate the interference between UWB and Wireless local area network (5.15–5.825 GHz) assigned to IEEE 802.11a and HIPERLAN/2 can be reduced. Now to increase the functionality of the antenna, a second iterated fractal binary tre...

Compact ultra-wideband antenna with band-notched based on defected ground structure

Abstract: A simple and very compact planar monopole ultra-wideband antenna with a 3.5 GHz band rejection is proposed in this Letter. The compact antenna is etched on an FR4 substrate with the size of 14 × 16 × 1 mm3, consists of a tree-shaped radiation patch with modified ground structure. To reject certain frequency band, a pair of parallel strip patch, acting as a parasitic element is used. Prototype of the proposed antenna was constructed and measured. The measured impedance bandwidth of the realised antenna with optimal parameters is from 2.6 to 12 GHz (128%) for voltage standing wave ratio <2 with an unwanted band notched from 3.3 to 4 GHz. Moreover, the antenna has good omnidirectional radiation patterns in the H-plane.

Dual-polarised monopole-slot co-located MIMO antenna for small-volume terminals

Abstract: A dual-polarised monopole-slot co-located MIMO antenna is proposed for 2.4 GHz wireless local area network (WLAN) applications. The antenna consists of a monopole with its ground folded and a compact coplanar waveguide feed, providing the vertical and horizontal polarisations. The antenna is designed for a volume-limiting MIMO system due to its compact dimensions of 50×16×16 mm3 (0.4λ0×0.128λ0×0.128λ0) and high isolation better than −24 dB. The performance of the proposed antenna has also been measured, including the S-parameters, the radiation patterns and the gain, which agree well with the simulation results.