| 1. |
- Farid, N., et al.
(författare)
-
Exploring Uniformity of Reverberation Chambers: Insights from Antenna Reflection Coefficient
- 2024
-
Ingår i: 18th European Conference on Antennas and Propagation, EuCAP 2024.
-
Konferensbidrag (refereegranskat)abstract
- Reverberation chambers are widely recognized as a time-efficient testing facility for various applications. The spatial uniformity based on the power transfer function is a critical characteristic of the chamber that affects the measurement uncertainty. To gain more insights into the chamber behavior we introduce a complementary metric: the K-gamma factor. This metric, inspired by the well-established K-factor, quantifies the unstirred contributions of the chamber for each antenna individually and is highly sensitive to the chamber configuration and antenna placement. Analyzing this metric can help identify any undesired effect, such as specular reflections, and, ultimately, improve measurement accuracy. To highlight the usefulness of this metric, two different loading configurations of a reverberation chamber at millimeter-wave frequencies are evaluated as examples.
|
|
| 2. |
- Vilenskiy, Artem, 1988, et al.
(författare)
-
Millimeter-Wave Quasi-Optical Feeds for Linear Array Antennas in Gap Waveguide Technology
- 2022
-
Ingår i: 2022 16th European Conference on Antennas and Propagation, EuCAP 2022.
-
Konferensbidrag (refereegranskat)abstract
- A realization of the quasi-optical (QO) feed concept for linear millimeter-wave (sub-)array antennas is demonstrated in gap waveguide technology. The proposed feed architecture employs an input transition from a ridge gap waveguide (RGW) to a groove gap waveguide (GGW), a radial (H-plane sectoral) GGW section, and a transition to an output RGW array. A design decomposition approach is presented to reduce simulation complexity. Several 20-element QO feed implementations are investigated at W-band demonstrating a 20% relative bandwidth (85-105 GHz), 0.5 dB insertion loss, and a capability of an amplitude taper control within the 10-20 dB range.
|
|
| 3. |
- Vilenskiy, Artem, 1988, et al.
(författare)
-
Quasi-Optical Beamforming Network for Millimeter-Wave Electronically Scanned Array Antennas with 1-Bit Phase Resolution
- 2021
-
Ingår i: 15th European Conference on Antennas and Propagation, EuCAP 2021. ; , s. 1-5
-
Konferensbidrag (refereegranskat)abstract
- State-of-the-art design solutions for electronically scanned array antennas are mostly limited to microwave to low mm-wave frequency bands, while the demand for new designs at higher frequencies (i.e. frequencies beyond 100 GHz) is rapidly growing. We attempt to fill in this knowledge gap by presenting a new linear array antenna architecture as a building block of 2D arrays that can enable efficient beam steering and a simplified array design. This concept is based on the combination of a low-loss quasi-optical (QO) feed, providing predefined antenna port excitation, with 1-bit phase shifters which are co-integrated with the array antenna elements. In this study, we formulate the array design problem as minimization of the sidelobe level (SLL) through an optimum quasi-randomization of phase errors. An analytical expression for the optimum focal ratio of the QO feed has been derived to establish the relationships between the key design parameters. These results are validated through numerical simulations revealing that the optimum focal ratio leads to the minimum SLL.
|
|
