Proposed Ka-band array-fed near field Cassegrain system for NASA's Polar Probe Mission

1992 ◽  
Author(s):  
K. KELLOGG ◽  
V. KAPOOR ◽  
J. VACCHIONE ◽  
D. RASCOE ◽  
T. KOMAREK ◽  
...  
Keyword(s):  
Near Field ◽  
Ka Band ◽  
Polar Probe ◽  
Probe Mission

scholarly journals Ka-Band Lightweight High-Efficiency Wideband 3D Printed Reflector Antenna

2017 ◽  
Vol 2017 ◽  
pp. 1-7 ◽  
Author(s):  
Yu Zhai ◽  
Ding Xu ◽  
Yan Zhang
Keyword(s):  
High Efficiency ◽  
Near Field ◽  
Side Lobe ◽  
High Gain ◽  
Reflector Antenna ◽  
Field Analysis ◽  
Side Lobe Level ◽  
Ka Band ◽  
3D Printed ◽  
Reflecting Surface

This paper presents a lightweight, cost-efficient, wideband, and high-gain 3D printed parabolic reflector antenna in the Ka-band. A 10 λ reflector is printed with polylactic acid- (PLA-) based material that is a biodegradable type of plastic, preferred in 3D printing. The reflecting surface is made up of multiple stacked layers of copper tape, thick enough to function as a reflecting surface (which is found 4 mm). A conical horn is used for the incident field. A center-fed method has been used to converge the energy in the broadside direction. The proposed antenna results measured a gain of 27.8 dBi, a side lobe level (SLL) of −22 dB, and a maximum of 61.2% aperture efficiency (at 30 GHz). A near-field analysis in terms of amplitude and phase has also been presented which authenticates the accurate spherical to planar wavefront transformation in the scattered field.

Reactive-to-Radiating Near-Field Propagation Behavior Measured on a Ka-Band Horn Antenna

2011 ◽  
Vol 10 ◽  
pp. 1085-1087 ◽  
Author(s):  
Dong-Joon Lee ◽  
Jae-Yong Kwon ◽  
No-Weon Kang ◽  
J. F. Whitaker
Keyword(s):  
Near Field ◽  
Horn Antenna ◽  
Ka Band ◽  
Propagation Behavior

Ka-Band Near-Field-Focused 2-D Steering Antenna Array With a Focused Rotman Lens

2018 ◽  
Vol 66 (10) ◽  
pp. 5204-5213 ◽  
Author(s):  
Ya Fei Wu ◽  
Yu Jian Cheng ◽  
Zi Xuan Huang
Keyword(s):  
Antenna Array ◽  
Near Field ◽  
Ka Band

scholarly journals Evaluation of a Dielectric-Only Transmitarray for Generating Multi-Focusing Near-Field Spots Using a Cluster of Feeds in the Ka-Band

Sensors ◽  
2021 ◽  
Vol 21 (2) ◽  
pp. 422
Author(s):  
Álvaro F. Vaquero ◽  
Marcos Rodríguez Pino ◽  
Manuel Arrebola ◽  
Sérgio A. Matos ◽  
Jorge R. Costa ◽  
...  
Keyword(s):  
Near Field ◽  
High Agreement ◽  
Ka Band ◽  
High Isolation ◽  
Spot Area ◽  
Full Wave ◽  
Spot Scanning ◽  
Printing Technique ◽  
Feeding Configuration ◽  
3D Printing Technique

A transmitarray antenna is evaluated to generate a multi-focusing spot area in the Fresnel region of the antenna in the Ka-band. The antenna is designed to focus the radiated field at a certain point using a central feeding configuration. The number of feeds is increased to create as many focusing spots as feeds. The feeds are placed along an arc defined in the principal planes of the transmitarray, radiating independent near-field spots and providing a solution with a wide-angle spot scanning without an antenna displacement and a high isolation between feeds. To validate this concept, a transmitarray based on dielectric-only cells is designed and simulated under full-wave conditions. Then, this design is manufactured using a 3D printing technique, and the prototype is measured in a planar acquisition range. Measurements are performed for different feed positions in order to validate the multi-focusing capability of the antenna. Measurements and simulations show a high agreement and validate the proposed design technique.

Sign in / Sign up

Export Citation Format

Share Document