scholarly journals Different Feeding Techniques of Microstrip Patch Antennas with Spiral Defected Ground Structure for Size Reduction and Ultra-Wide Band Operation

2012 ◽  
Vol 04 (10) ◽  
pp. 410-418 ◽  
Author(s):  
Dalia M. Elsheakh ◽  
Esmat A. Abdallah
Keyword(s):  
Wide Band ◽  
Size Reduction ◽  
Ultra Wide Band ◽  
Patch Antennas ◽  
Defected Ground Structure ◽  
Ground Structure ◽  
Microstrip Patch Antennas ◽  
Microstrip Patch ◽  
Feeding Techniques

Metamaterial-Based Wearable Microstrip Patch Antennas

2018 ◽  
pp. 444-488
Author(s):  
J. G. Joshi ◽  
Shyam S. Pattnaik
Keyword(s):  
Loading Condition ◽  
Size Reduction ◽  
Patch Antennas ◽  
Microstrip Patch Antennas ◽  
Microstrip Patch ◽  
Wearable Antennas ◽  
Antenna Performance ◽  
Bending Effect ◽  
Resonant Modes ◽  
Sub Wavelength

This chapter presents metamaterial-based wearable, that is, textile-based, antennas for Wi-Fi, WLAN, ISM, BAN and public safety band applications, which have been designed, fabricated, and tested. Textile substrates like polyester and polypropylene are used to design and fabricate these antennas. The metamaterial inclusions are directly used to load the different microstrip patch antennas on the same substrate, which significantly enhances the gain and bandwidth with considerable size reduction. The microstrip patch antenna generates sub-wavelength resonances under loading condition due to the modifications of its resonant modes. The DNG and SNG metamaterials are used to load the microstrip patch antennas for size reduction by generating the sub-wavelength resonances. The simulated and measured results are found to be in good agreement for all the presented wearable antennas. The bending effect on antenna performance due to human body movements is also presented in this chapter.

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