Near Field Quasi Plane Wave Generation and Performance Evaluation

Sun, Xuelei; Wang, Zhengpeng; Miao, Jungang

doi:10.23919/apmc.2018.8617156

Cited by 10 publications

(3 citation statements)

References 8 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The length of the chamber is 2 m, which is equivalent to ∼ 23λ at the working frequency. This distance between the PWG and a DUT has been chosen based on analysis of free-space PWGs [11]- [14]. Both end-walls are covered with absorbers to emulate infinite waveguide propagation conditions and eliminate unwanted reflections.…”

Section: Introductionmentioning

confidence: 99%

Quiet Zone Quality of a Plane Wave Generator inside an Over-Moded Waveguide Chamber Emulating a Variable Angle of Incidence

Krasov

Iupikov

Maaskant

et al. 2021

2021 15th European Conference on Antennas and Propagation (EuCAP)

View full text Add to dashboard Cite

We investigate the use of a hybrid over-the-air (OTA) measurement chamber to emulate far-field testing conditions. The focus has been on the generation of a plane wave arriving at an arbitrary angle-of-arrival (AoA) to the device-under-test (DUT) without mechanical steering. The chamber consists of an oversized waveguide (WG) and a planar array antenna with adaptive beamforming. A modified linear constrained minimum variance (LCMV) beamforming algorithm is used to form a quiet zone (QZ) in the DUT region by using the reflections from the WG's metal walls. The LCMV beamformer formulation has been extended to achieve a volumetric QZ with the desired amplitude and phase uniformity. Numerical studies for the QZ size corresponding to an FR1 base station demonstrate promising results with the low levels of amplitude and phase variation. The AoA coverage of this chamber meets 3GPP specification requirements for OTA conformance testing of base stations with active antenna systems.

show abstract

Section: Introductionmentioning

confidence: 99%

Quiet Zone Quality of a Plane Wave Generator inside an Over-Moded Waveguide Chamber Emulating a Variable Angle of Incidence

Krasov

Iupikov

Maaskant

et al. 2021

2021 15th European Conference on Antennas and Propagation (EuCAP)

View full text Add to dashboard Cite

show abstract

“…The size of the generated plane waves is at least 1 × 1 m 2 , and it is large enough to cover the 5G BS antenna panels from 3.4 GHz to 3.6 GHz. Typically, the maximum amplitude deviation of the generated plane waves is less than 1 dB and the maximum phase deviation is less than 10 • [20]. The polarization of the generated plane waves is linear polarization, and the dual-polarization 5G BS antennas can be tested by rotating the 5G BS antennas through 90 degrees.…”

Section: Design Theory Of the Subarraymentioning

confidence: 99%

A High Channel Consistency Subarray of Plane-Wave Generators for 5G Base Station OTA Testing

2019

Self Cite

View full text Add to dashboard Cite

A high channel consistency subarray of plane-wave generators (PWG) is described for fifth-generation (5G) base station (BS) over-the-air (OTA) testing. Firstly, the variation of the near field radiation characteristics of the subarray based on the feed amplitude and phase errors of the traditional power divider network is analyzed. The recommended amplitude and phase errors between channels are given. After that, a novel subarray which combines four pyramidal horn antennas and a compact 1:4 waveguide power divider is designed. The optimized perfectly symmetrical zigzag waveguide transmission lines are used to realize consistent power allocation among antenna elements. No intermediate pins are employed, which avoids the significant deterioration of channel consistency caused by assembly errors. The size of the subarray is 4.89 λ0 × 4.97 λ0 × 1.23 λ0 (λ0 is the working wavelength corresponding to the subarray center frequency at 3.5 GHz). The VSWR < 1.5 impedance bandwidth covers 3.4 GHz to 3.6 GHz. The amplitude difference between the four elements of the subarray is less than 0.5 dB, and the phase difference is less than 3°. The simulated and measured results agree well in this design.

show abstract

“…By doing so, we can greatly simplify the feeding network design. In conventional PWG methods, we often need to optimize the amplitude and phase excitations of elements with constraints, which can be computationally prohibitive, especially for large-scale PWG design [17]. With our proposed method, only three parameters of the tapering function need to be optimized for each frequency band, which can reduce the complexity significantly.…”

mentioning

confidence: 99%

Design and Implementation of a Wideband Dual-Polarized Plane Wave Generator With Tapered Feeding Nonuniform Array

Zhang

Wang

Sun

et al. 2020

Antennas Wirel. Propag. Lett.

Self Cite

View full text Add to dashboard Cite

This paper presents a sub-6 GHz cost-effective wideband dual-polarized plane wave generator (PWG) design for 5G base station (BS) over-the-air (OTA) test. The proposed nonuniform PWG design is composed of 256 elements and has a dimension of 1.7 m×1.7 m. Several novel strategies are proposed and implemented to reduce the cost and complexity. To reduce feeding network complexity and mutual coupling among PWG elements, a novel tapered amplitude-only excitation method (i.e. with the same relative phase excitations among all PWG elements) is proposed. To reduce the number of channels in the phase and amplitude control network, a 4-element subarray is applied. Furthermore, wideband PWG element design and non-uniform configuration are applied to support for ultra-wideband operations from 2 GHz to 5 GHz. The proposed PWG design is numerically simulated and experimentally validated. A cylindrical quiet zone of a diameter of 0.9 m and a depth of 0.9 m, with 2.1 m distance to the PWG, is achieved in the measurement for the considered bandwidth, with typical peak-to-peak (PP) E-field amplitude and phase variations less than ±1.25 dB and ±7.5º, respectively, which demonstrated its effectiveness and robustness.

show abstract

Near Field Quasi Plane Wave Generation and Performance Evaluation

Cited by 10 publications

References 8 publications

Quiet Zone Quality of a Plane Wave Generator inside an Over-Moded Waveguide Chamber Emulating a Variable Angle of Incidence

Quiet Zone Quality of a Plane Wave Generator inside an Over-Moded Waveguide Chamber Emulating a Variable Angle of Incidence

A High Channel Consistency Subarray of Plane-Wave Generators for 5G Base Station OTA Testing

Design and Implementation of a Wideband Dual-Polarized Plane Wave Generator With Tapered Feeding Nonuniform Array

Contact Info

Product

Resources

About