Reduced groundplane shorted patch antenna for on-body communications
ABSTRACT This paper introduces a compact, low profile shorted patch antenna designed for on-body communication at 2.45 GHz. The proposed antenna operates with a small (~Â¿/5 dimension) groundplane yet maintains a reasonable radiation efficiency of 50.9 % when in close proximity to a muscle tissue phantom. The antenna has more than sufficient impedance bandwidth for the 2.45 GHz band (126 MHz for |S11|<-10 dB), yet its overall height is only 5.75 mm or Â¿/21. For on-body communications, a maximum |S21| path gain of -44.7 dB was obtained at 2.45 GHz.
Article: Wearable Antenna Design for FM Radio[Show abstract] [Hide abstract]
ABSTRACT: In this paper, a wearable patch antenna is designed for Frequency Modulation radio applications. The resonant frequency of this designed antenna is 100 MHz. The main objective of this research work was to reduce the size of the designed antenna, so that it can be worn over human body. Shorting wall along the length of patch and U-slot in the patch are used to reduce the size of designed antenna. Parametric analysis on different parameters of designed antenna is done for achieving an optimal design with little compromise on antenna efficiency. Finally, the overall dimensions of patch, in terms of central frequency, are 0.0475 × 0.068 wavelengths. From the dimensions, it is shown that almost 84 % size of patch is reduced as compared to λ/2 patch antenna for 100 MHz. The designed antenna is flexible and conformal to the human body shape. Designed antenna is tested over human body and measurements of the return loss show that impedance bandwidth is 5 %.ARABIAN JOURNAL FOR SCIENCE AND ENGINEERING 08/2014; 39(8):6189-6195. DOI:10.1007/s13369-014-1169-5 · 0.37 Impact Factor
[Show abstract] [Hide abstract]
ABSTRACT: This paper describes self conceived design of new dual band wearable PIFA operating at Wifi bands (2.40 & 5.80GHz). Different radiating elements used in this indigenous design, outcomes dual mode resonance. The considered design approach has quasi omni-directional pattern that leads to significant back radiations resulting high value of Specific Absorption Rate (SAR), usually not desirable in wearable application. To overcome this issue, the antenna is integrated with dual band high impedance surface (HIS). This modular integration results in reduction of back radiations by 4-15dB at operating frequencies. Sequel to reduction in back radiations, SAR has also been reduced at the operating frequencies, while evaluating its design response for on-body environment. In addition to these improvements, antenna gain has been increased by 8-9dBi along with improvement in return loss by 23-27dB at the operating frequencies. CST Microwave Studio has been used for the design and simulations.2013 IEEE 9th International Conference on Emerging Technologies (ICET), Islamabad, Pakistan; 12/2013
[Show abstract] [Hide abstract]
ABSTRACT: This article presents design of a new dual band textile antenna for WiFi application. Normally available felt fabric is utilized for the design. Operating frequencies of the antenna are 2.4GHz and 5.8GHz. Designed antenna is tested in free space and in the proximity of human body model. Because of coupling with human body, the antenna performance degrades, therefore dual band high impedance surface (HIS) has been employed for minimizing these degradations. The HIS array is composed of only 9 (3×3) elements and reduces the radiations toward body and hence minimizes specific absorption rate (SAR) by 94-97 % at the operating frequencies. The integrated design is able to show improvements in return loss, gain and directivity while maintaining good impedance match with adequate bandwidth at the operating frequencies. CST Microwave Studio has been used for all the simulations and designs.8th European Conference on Antennas and Propagation (EuCAP), Hague; 04/2014