Effects of lossy dielectric material on microstrip antennas

2002 ◽  
Author(s):  
K.H. Pan ◽  
J.T. Bernhard ◽  
T.G. Moore
Keyword(s):  
Dielectric Material ◽  
Microstrip Antennas ◽  
Lossy Dielectric

Dual Band Slotted Microstrip Patch Antenna For Wireless Applications

2015 ◽  
Vol 6 (1) ◽  
Author(s):  
Sushila Gupta ◽  
Esha Johari
Keyword(s):  
Patch Antenna ◽  
Dielectric Material ◽  
Dielectric Substrate ◽  
Microstrip Antennas ◽  
Dual Band ◽  
Band Frequency ◽  
Feeding Method ◽  
Wireless Applications ◽  
Microstrip Patch ◽  
Dual Band Antenna

This paper describes dual-band patch antenna. The dual-band operation is obtained by embedding a pair of Lshaped slots. Dual band antenna can reduce the size of antenna 40%, comparing with rectangular microstrip antennas on normal dielectric substrate, and have wider bandwidths for both bands. In this paper L-shaped slots patch antenna with length L= 25.74 mm and width W = 31.20 mm fabricated based on availability of Rogers Duorid 5880 dielectric material and a prototype antenna is developed. The dielectric constant of Rogers Duorid 5880 material is e= 2.2 having thickness h = 0.16 mm and copper thickness is 35 microns using a coaxial feeding method for dual band operation. The prototype antenna is operating in S band frequency range.

Influence of some structural parameters on the dielectric behavior of materials for textile antennas

2018 ◽  
Vol 89 (7) ◽  
pp. 1131-1143 ◽  
Author(s):  
Caroline Loss ◽  
Ricardo Gonçalves ◽  
Pedro Pinho ◽  
Rita Salvado
Keyword(s):  
Surface Roughness ◽  
Dielectric Material ◽  
Structural Parameters ◽  
Microstrip Antennas ◽  
Dielectric Behavior ◽  
Electromagnetic Properties ◽  
Textile Materials ◽  
Dielectric Characterization ◽  
Wearable Antennas ◽  
Constant E

Knowledge of the electromagnetic properties of textile materials is crucial in order to design wearable antennas. Despite the growth of research studies on textile antennas, the accurate characterization of the dielectric properties of the materials is still a challenge due to the intrinsic inhomogeneity and deformability of textiles. In this work, 11 textile materials were characterized using the resonator-based experimental technique. The results obtained using this method have shown that when positioning the roughest face of the Material Under Test (MUT) in contact with the resonator board, the extracted dielectric constant (ɛ r) value is lower than the one extracted with this face positioned upside-down. Based on this observation, superficial properties of textiles were investigated. Thus, this paper relates the results of the dielectric characterization to some structural parameters of textiles, such as surface roughness and surface and bulk porosity. The results show that both surface roughness and surface porosity of the samples influence the measurements, through the positioning of the probes. Further, the influence of the positioning of the dielectric material on the performance of textile microstrip antennas was analyzed. For this, 12 prototypes of microstrip patch antennas were developed and tested. The results show that, despite the differences obtained in the characterization when placing the face or reverse-sides of the MUT in contact with the resonator board, the obtained average result of ɛ r is well suited to design antennas, ensuring a good performance.

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