Broadband Quadrature Hybrid for Image Rejection in Millimeter-wave Receivers

Dilshad, Umar; Chen, Chen; Chen, Xi; Miao, Jungang

doi:10.1109/ibcast.2019.8667265

Cited by 3 publications

(2 citation statements)

References 9 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Thus, methods of enhancing operational bandwidths are still the subject of research. One of the widely known concepts of broadband branch-line couplers is an N-section branch-line coupler [14,15]. The bandwidths of such couplers can be significantly increased at the expense of increasing their total size.…”

Section: Introductionmentioning

confidence: 99%

Chebyshev-Response Branch-Line Couplers with Enhanced Bandwidth and Arbitrary Coupling Level

2020

View full text Add to dashboard Cite

A new approach to the synthesis of broadband branch-line couplers with arbitrary coupling level was investigated in this paper. It was shown that the operational bandwidth of a classic branch-line coupler can be increased by utilizing N-section impedance transformers added to each of the coupler’s ports. Furthermore, the obtained response can be approximated by the Chebyshev polynomial. Moreover, it was proven that for such couplers a range of coupling coefficient values can be obtained by the modification of classic branch-line topology. The analysis of the electrical parameters of the proposed branch-line couplers was comprehensively investigated. To verify the correctness of the proposed design procedures, 3-dB, and 6-dB broadband branch-line couplers operating at the center frequency of 2 GHz having return losses greater than 20 dB were designed, fabricated, and measured.

show abstract

Section: Introductionmentioning

confidence: 99%

Chebyshev-Response Branch-Line Couplers with Enhanced Bandwidth and Arbitrary Coupling Level

2020

View full text Add to dashboard Cite

show abstract

“…The traditional branch-line coupler [1] is narrowband, having around 20% fractional bandwidth. For its bandwidth broadening, multiple cascaded stages can be employed [2,3]. Some researchers also proposed additional matching stubs, compensation circuits, or additional broadband phase shifters for this purpose [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

A Wide-Band Compact Quadrature Coupler on Multi-Layer Package Substrate

Dilshad¹,

Chen²,

Altaf³

et al. 2020

PIER Letters

Self Cite

View full text Add to dashboard Cite

This paper presents the design of a 3.8 ∼ 8.0 GHz wide-band quadrature coupler on a multi-layer package substrate. The asymmetric coupled-line 3-dB quadrature coupler has been designed on a four-layer microwave substrate, with a 10-mil thick top layer of Roger's RO4350B substrate pressjoined to a 20-mil thick bottom layer of RO4350B, through 4-mil thick bond-ply material RO4450B. In the proposed design, the second and third metal layers are used as coupling layers, while the fourth (bottom) layer provides four signal pads and one large ground pad for connection with the test circuit. The mutual coupling is achieved through the overlay of coupled lines. Four VIA holes are used for signal transition from coupling layers to the bottom-layer pads. The SMD package quadrature coupler provides the ease of integration with other microwave circuits. The quadrature coupler chip size is 4.0 mm × 8.0 mm × 0.9 mm. The measurement results show a close resemblance to the EM-simulation results. The measured results depict reasonably flat 3-dB coupling and quadrature phase difference. The amplitude imbalance remains within 1.0 dB, while the phase imbalance always remains much less than 3.0 degrees. The return loss and isolation are better than 13 dB, throughout the whole frequency band. The proposed design is quick and simple. The manufacturing process is also cost-effective. To the best of the author's knowledge, these measured performance parameters in 71% fractional bandwidth associated with the compact size of the self-packaged device are better than those of the earlier published 4-layer design schemes of wideband quadrature couplers.

show abstract

A Novel Broadband Microwave Lumped-Element Quadrature Hybrid MMIC

Chen

Gong

et al. 2022

IEEE Access

View full text Add to dashboard Cite

Broadband Quadrature Hybrid for Image Rejection in Millimeter-wave Receivers

Cited by 3 publications

References 9 publications

Chebyshev-Response Branch-Line Couplers with Enhanced Bandwidth and Arbitrary Coupling Level

Chebyshev-Response Branch-Line Couplers with Enhanced Bandwidth and Arbitrary Coupling Level

A Wide-Band Compact Quadrature Coupler on Multi-Layer Package Substrate

A Novel Broadband Microwave Lumped-Element Quadrature Hybrid MMIC

Contact Info

Product

Resources

About