A Miniaturized Microstrip Branch-Line Hybrid Coupler Using Two Sections and Coupled-Lines

Wu, Xiaoqing; Shen, Lin‐Ping

doi:10.1109/aps/ursi47566.2021.9703777

Cited by 4 publications

(2 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…To verify the above concept, a planar single‐layer 3 × 4 BM with phase differences −90°, 0°, and +90° is designed to operate at the center frequency of 2.19 GHz. To achieve wider frequency bandwidth, two stage T ‐splitter power divider and two sections cascaded 3 dB branch‐line directional coupler (BLC) 11 are used to construct the 3 × 4 Butler design. Figure 3 shows the layout of 3 × 4 BM on Rogers RO4534 with the substrate thickness of 0.82 mm and the relative dielectric constant of 3.50.…”

Section: Analysis and Designmentioning

confidence: 99%

A novel broadband 3 × 4 Butler matrix beamforming network without crossovers

Shen

Zhang

2023

Micro & Optical Tech Letters

Self Cite

View full text Add to dashboard Cite

A novel broadband three‐input four‐output (3 × 4) Butler matrix (BM) without crossover is presented for the wider band operation. The proposed 3 × 4 BM is composed of three 3 dB branch‐line directional couplers, one T‐splitter power divider, and two 90° phase shifters. Unlike the traditional BM, the proposed BM network has successfully eliminated the crossover connection for simplifying the network, which operates in a wide operating range. For the validation of the design, a planar single‐layer 3 × 4 BM working at the frequency band of 1.69–2.69 GHz is designed, fabricated, and measured. The measurement result gives bandwidth up to 46% with return loss better than 14.3 dB at the full operating frequency band.

show abstract

Section: Analysis and Designmentioning

confidence: 99%

A novel broadband 3 × 4 Butler matrix beamforming network without crossovers

Shen

Zhang

2023

Micro & Optical Tech Letters

Self Cite

View full text Add to dashboard Cite

show abstract

“…For depiction correlations between amplitudes and phases, transmission block T 3×3 in (1) could be represented by Euler's formula as following: To achieve the wide bandwidth and reduce the size of the quadrature hybrid, a cascaded three-section branch line coupler (BLC) with three-pair coupled line is adopted [19,20]. The initial impedance of quarter-wavelength branch lines is given by Z 1 = 54 Ω, Z 2 = 58 Ω, Z 3 = Z 4 = 143 Ω and the phase of quarter-wavelength is θ 1 = θ 2 = θ 3 = θ 4 = 90° [21].…”

Section: Analysis and Designmentioning

confidence: 99%

A broadband Butler-based dual-polarized omni-directional antenna

Shen

Zhang

2023

Int. J. Microw. Wireless Technol.

Self Cite

View full text Add to dashboard Cite

This paper presents a broadband Butler-based slant ±45° dual-polarized omni-directional antenna working at the frequency band of 1.69–2.69 GHz for extending wireless communication network capacity in the limited service size. The proposed antenna realizes a 360° full coverage with wider bandwidth in a compact cylinder and increases the network capacity to 6 × 6 MIMO instead of using three traditional 2 × 2 MIMO omni-directional antennas. Theoretical analysis, simulation, and fabrication are conducted to validate the idea of the proposed omni-directional antenna. The measured results show 46% bandwidth with 15 dB return loss, 2.2 dB azimuth null and 8.9–10.5 dBi gain for port-C with 0° phase increment, and 14.1 dB azimuth null and 9.6–10.6 dBi gain for port-L/R (left/right) with ±120° phase increment, respectively.

show abstract