Analysis and Design of Probe-Fed Linearly-Polarized Microstrip Antennas on FR4 Substrates

2014 ◽  
Vol 12 (6) ◽  
pp. 965-970 ◽  
Author(s):  
Daniel Chagas Nascimento ◽  
Jose Carlos Silva Lacava
Keyword(s):  
Microstrip Antennas ◽  
Analysis And Design ◽  
Linearly Polarized

scholarly journals Analysis and Design of Cavity-Backed Probe-Fed Hybrid Microstrip Antennas on FR4 Substrate

2015 ◽  
Vol 2015 ◽  
pp. 1-12 ◽  
Author(s):  
D. C. Nascimento ◽  
Prêntice C. Ribeiro Filho ◽  
Alexis F. Tinoco-S ◽  
J. C. da S. Lacava
Keyword(s):  
Microstrip Antenna ◽  
Mutual Coupling ◽  
Low Cost ◽  
Microstrip Antennas ◽  
Substrate Integrated Waveguide ◽  
Cross Polarization ◽  
Analysis And Design ◽  
Linearly Polarized

A novel cavity-backed probe-fed linearly polarized microstrip antenna based on the concept of hybrid radiators is proposed and implemented. The resulting flush-mounted antenna exhibits symmetrical bandwidth, low cross-polarization radiation in theH-plane, due to its hybrid patch, and low cost, since it can be built on a FR4 laminate. Substrate integrated waveguide technology is used in the fabrication of the metallic cavity. The effect of mutual coupling is analyzed for two classical arrangements: the side-by-side and the collinear configurations.

scholarly journals Analysis of Circular Polarization of Cylindrically Bent Microstrip Antennas

2012 ◽  
Vol 2012 ◽  
pp. 1-8 ◽  
Author(s):  
Tiiti Kellomäki
Keyword(s):  
Simple Model ◽  
Circular Polarization ◽  
Axial Ratio ◽  
Microstrip Antennas ◽  
Far Field ◽  
Circularly Polarized ◽  
Wearable Antennas ◽  
Linearly Polarized ◽  
Frequency Shifting

When circularly polarized (CP) microstrip antennas are bent, the polarization becomes elliptical. We present a simple model that describes the phenomenon. The two linear modes present in a CP patch are modeled separately and added together to produce CP. Bending distorts the almost-spherical equiphase surface of a linearly polarized patch, which leads to phase imbalance in the far-field of a CP patch. The model predicts both the frequency shifting of the axial ratio band as well as the narrowing of the axial ratio beam. Uncontrolled bending is a problem associated especially with flexible textile antennas, and wearable antennas should therefore be designed somewhat conformal.

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