Design of cross-polarization suppressed waveguide array for desired radiation pattern

2003 ◽  
Author(s):  
G.S.N. Raju ◽  
A. Chakraborty ◽  
B.N. Das
Keyword(s):  
Radiation Pattern ◽  
Waveguide Array ◽  
Cross Polarization

Compact Fractal Left-Handed Structures for Improved Cross-Polarization Radiation Pattern

2014 ◽  
Vol 62 (2) ◽  
pp. 546-554 ◽  
Author(s):  
He-Xiu Xu ◽  
Guang-Ming Wang ◽  
Mei Qing Qi ◽  
Tong Cai
Keyword(s):  
Radiation Pattern ◽  
Cross Polarization ◽  
Left Handed

scholarly journals Design of a SIW Variable Phase Shifter for Beam Steering Antenna Systems

Electronics ◽  
2019 ◽  
Vol 8 (9) ◽  
pp. 1013 ◽  
Author(s):  
Sara Salem Hesari ◽  
Jens Bornemann
Keyword(s):  
Reflection Coefficient ◽  
Radiation Pattern ◽  
Phase Shifter ◽  
Beam Steering ◽  
Antenna System ◽  
Far Field ◽  
Cross Polarization ◽  
Varactor Diodes ◽  
Field Radiation ◽  
Better Than

This paper proposes a new beam steering antenna system consisting of two variable reflection-type phase shifters, a 3 dB coupler, and a 90° phase transition. The entire structure is designed and fabricated on a single layer of substrate integrated waveguide (SIW), which makes it a low loss and low-profile antenna system. Surface mount tuning varactor diodes are chosen as electrical phase control elements. By changing the biasing voltage of the varactor diodes in the phase shifter circuits, the far-field radiation pattern of the antenna steers from −25° to 25°. The system has a reflection coefficient better than −10 dB for a 2 GHz bandwidth centered at 17 GHz, a directive radiation pattern with a maximum of 10.7 dB gain at the mid-band frequency, and cross polarization better than 20 dB. A prototype is fabricated and measured for design verification. The measured far-field radiation patterns, co and cross polarization, and the reflection coefficient of the antenna system agree with simulated results.

scholarly journals A Novel Wideband Magneto-Electric Dipole Antenna with Improved Feeding Structure

2016 ◽  
Vol 5 (2) ◽  
pp. 10
Author(s):  
N. Marwah ◽  
G. P. Pandey ◽  
V. T. ◽  
S. S. Marwah
Keyword(s):  
Radiation Pattern ◽  
Electric Dipole ◽  
Wide Band ◽  
Dipole Antenna ◽  
Ultra Wide Band ◽  
Impedance Bandwidth ◽  
Cross Polarization ◽  
Radiation Patterns ◽  
Feeding Structure

A novel feeding structure in magneto-electric dipole antenna is proposed and analyzed, which is simpler and better in performance than previous designs, involving differential feeding.  Due to this improved feeding structure, the antenna has achieved an impedance bandwidth of 133.3% ( 0.5 GHz – 2.5 GHz, resulting into an ultra-wide band antenna. The maximum broadside gain 7.5dBi with unidirectional radiation pattern has also been reported for the entire the range of operation. Symmetry in E-plane and H-plane radiation patterns has been observed due to the symmetry in structure and excitation of antenna. The antenna has also been able to achieve cross polarization levels.

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