Investigations on frequency agile dual polarization dielectric lens high gain antenna

2016 ◽  
Author(s):  
Asmita Chaugule ◽  
Ghanshyam Mishra ◽  
Satish K. Sharma
Keyword(s):  
High Gain ◽  
Dual Polarization ◽  
High Gain Antenna ◽  
Frequency Agile ◽  
Dielectric Lens

scholarly journals H-plane horn antenna with enhanced directivity using conformal transformation optics

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Hossein Eskandari ◽  
Juan Luis Albadalejo-Lijarcio ◽  
Oskar Zetterstrom ◽  
Tomáš Tyc ◽  
Oscar Quevedo-Teruel
Keyword(s):  
Conformal Transformation ◽  
Phase Error ◽  
Three Dimensional ◽  
Physical Space ◽  
Horn Antenna ◽  
High Gain ◽  
Transformation Optics ◽  
Graded Index ◽  
Low Profile ◽  
Dielectric Lens

AbstractConformal transformation optics is employed to enhance an H-plane horn’s directivity by designing a graded-index all-dielectric lens. The transformation is applied so that the phase error at the aperture is gradually eliminated inside the lens, leading to a low-profile high-gain lens antenna. The physical space shape is modified such that singular index values are avoided, and the optical path inside the lens is rescaled to eliminate superluminal regions. A prototype of the lens is fabricated using three-dimensional printing. The measurement results show that the realized gain of an H-plane horn antenna can be improved by 1.5–2.4 dB compared to a reference H-plane horn.

scholarly journals A Method for Measuring the Maximum Measurable Gain of a Passive Intermodulation Chamber

Electronics ◽  
2021 ◽  
Vol 10 (7) ◽  
pp. 770
Author(s):  
Zhanghua Cai ◽  
Yantao Zhou ◽  
Lie Liu ◽  
Francesco de Paulis ◽  
Yihong Qi ◽  
...  
Keyword(s):  
Approximate Method ◽  
Path Loss ◽  
High Gain ◽  
Directional Antenna ◽  
Anechoic Chamber ◽  
Measurement Interval ◽  
High Gain Antenna ◽  
Specific Relationship ◽  
Method Of Measurement ◽  
Passive Intermodulation

This paper presents an approximate method that allows the calculation of the maximum measurable gain (MMG) in an anechoic chamber. This method is realized by using a low passive intermodulation (PIM) medium-gain directional antenna. By reducing the distance between the antenna and the wall of the chamber to reduce path loss, the purpose of replacing a high-gain antenna with a medium-gain antenna is achieved. The specific relationship between distance and equivalent gain is given in this paper. The measurement interval is determined by the 3 dB beamwidth of the measurement antenna to scan the whole chamber. A set of corresponding data for the residual PIM level and the MMG of the chamber can be obtained by the method of measurement outlined herein. The feasibility of this method was verified by measurements in two PIM measurement chambers.

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