Results 91 to 100 of about 1,254 (122)

Control-Relaxed Wideband 2×4 Nolen Matrix With 360° Continuously Tuned Differential Phase

IEEE Transactions on Circuits and Systems II: Express Briefs
Da Yu, Hongmei Liu 0007, Shuo Li, Zhongbao Wang, Shaojun Fang   +4 more
openaire   +3 more sources

Planar $Ku$-Band 4$\,\times\,$4 Nolen Matrix in SIW Technology

IEEE Transactions on Microwave Theory and Techniques, 2010
In this paper, a 4 × 4 Nolen matrix beam-forming network for multibeam antenna applications is designed and demonstrated at 12.5-GHz center frequency. The structure is implemented using substrate integrated waveguide (SIW) technology for its attractive advantages including compact size, low loss, light weight, and planar form well suitable for high ...
T. Djerafi, N.J.G. Fonseca, null Ke Wu
openaire   +1 more source

A Symmetric Beam-Phased Array Fed by a Nolen Matrix Using 180° Couplers

IEEE Microwave and Wireless Components Letters, 2020
This letter presents a new microstrip line-phased array using $3 \times 3$ Nolen matrix – with three inputs and three output ports. For each input port excitation, the signal is divided into three equal magnitudes and unique progressive phase shifts at its output ports. The proposed microwave network is composed of three 180° couplers with two of
Peizhao Li, Han Ren, Bayaner Arigong
openaire   +1 more source

A Uniplanar $3\times 3$ Nolen Matrix Beamformer with Beam Squint Reduction

2020 IEEE International Symposium on Antennas and Propagation and North American Radio Science Meeting, 2020
In this paper, a uniplanar $\mathbf{3}\times \mathbf{3}$ Nolen matrix is proposed to improve the beam squinting for spatial FFT beamformer. The proposed multiple beam feeding network has three input ports and three output ports, and the signal is divided into three equal magnitudes and features unique progressive phase shifts at its output ports for ...
Peizhao Li, Han Ren, Bayaner Arigong
openaire   +1 more source

Investigation of Nolen matrix beamformer usability for capacity analysis in wireless MIMO systems

2013 19th Asia-Pacific Conference on Communications (APCC), 2013
This short paper presents the investigation of Nolen matrix beamforming network usability for capacity enhancement in wireless multiple-input multiple-output (MIMO) systems. The objective of this research is to thoroughly analyze and develop an analytical and mathematically-oriented investigation into system MIMO capacity improvement using a circuit ...
openaire   +2 more sources

Single-/Dual-Beam Switchable Beamforming Network Based on Phase-Shifter-Relaxed 4 × 4 Nolen Matrix

IEEE Transactions on Antennas and Propagation
Bo Wei Xu, Ye Yang, Shao Yong Zheng, Wenquan Che   +3 more
openaire   +3 more sources

Novel multi-layer SIW broadband coupler for Nolen matrix design in Ku band

2008 IEEE Antennas and Propagation Society International Symposium, 2008
All the components needed for a 4 times 4 Nolen matrix have been presented for application in multi-layer SIW technology. In particular, a novel 2-layers SIW broad-band coupler has been introduced. The wide coupling dynamic range of this coupler, being stable over a relatively wideband (up to 2 GHz in the Ku-Band), makes it a reliable element for ...
A. Ali, F. Coccetti, H. Aubert, N.J.G. Fonseca   +3 more
openaire   +1 more source

Broadband Substrate Integrated Waveguide 4$\,\times\,$4 Nolen Matrix Based on Coupler Delay Compensation

IEEE Transactions on Microwave Theory and Techniques, 2011
A broadband Nolen matrix in substrate integrated waveguide (SIW) technology is proposed and studied in this paper. Being serial feeding networks, Nolen matrices usually introduce significant phase dispersion in their standard form, thus limiting effective bandwidth.
Tarek Djerafi, Nelson J. G. Fonseca, Ke Wu   +2 more
openaire   +1 more source

A Novel 2-D $3\times3$ Nolen Matrix for 2-D Beamforming Applications

IEEE Transactions on Microwave Theory and Techniques, 2019
In this paper, a 2-D beamforming phased array using a novel 2-D Nolen matrix network is presented. The Nolen matrix is a novel antenna feeding network composed of only couplers with dedicated coupling ratios and phase shifters. It does not require crossover and load termination compared to other networks based on Butler and Blass matrix. To be specific,
Han Ren, Hanxiang Zhang, Yuqi Jin, Yixin Gu, Bayaner Arigong   +4 more
openaire   +1 more source

Design and implementation of a multibeam filtering antenna array using compact 3 × 3 Nolen matrix aided by grey wolf algorithm

AEU - International Journal of Electronics and Communications
Haiwen Liu, Xinyi Gu, Mengying Gao, Zeren Song, Hongliang Tian   +4 more
openaire   +3 more sources