A Balanced Filtering Branch-Line Coupler

Shi, Jin; Qiang, Jun; Xu, Kai; Wang, Zhengbin; Lin, Li; Chen, Jianxin; Liu, Wei; Zhang, Xiu Yin

doi:10.1109/lmwc.2016.2516764

Cited by 55 publications

(37 citation statements)

References 8 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In the past few years, a lot of research has been done about balanced circuits, such as balanced crossovers, balanced couplers, balanced filters, and balanced power dividers . In References and , eight‐port balanced couplers are realized with equal/unequal power division, however, the half‐wavelength transmission lines cannot realize wideband ideal 180° phase shift, so the common mode can only be suppressed in the power division center frequency, and the circuit size should be further reduced. In Reference , the ideal 180° phase inverters are introduced to realize balanced couplers with wideband common mode suppression, however, for the dual/tri‐band balanced couplers, the loaded coupled lines increase the design complexity and the whole circuit size.…”

Section: Introductionmentioning

confidence: 99%

Dual‐band balanced coupler with wideband common‐mode suppression

Feng

Duan

Shi

et al. 2019

Int J RF Microw Comput Aided Eng

View full text Add to dashboard Cite

A novel compact dual-band balanced coupler with differential-mode power division, broadband common-mode, and common-to-differential-mode conversion suppression is proposed. In these double-functionality balanced-coupler architectures, double-sided parallel-strip line 180 phase inverters are used to realize the broadband common-mode rejection. Moreover, the frequency is tunable by changing the characteristic impedance of the transmission line. For practical verification, a balanced couplers (ε r = 2.65, h = 0.5 mm, tan(δ D ) = 0.003) operation at 0.9/1.8 GHz is constructed in microstrip technology and tested. K E Y W O R D S180 phase inverter, balanced coupler, differential/common mode, differential-mode couplers, double-sided parallel-strip line (DSPSL)

show abstract

Section: Introductionmentioning

confidence: 99%

Dual‐band balanced coupler with wideband common‐mode suppression

Feng

Duan

Shi

et al. 2019

Int J RF Microw Comput Aided Eng

View full text Add to dashboard Cite

show abstract

“…However, all the above‐mentioned filters cannot inherently reject undesired CM signals. Microstrip‐slotline (MS) transition structure, showing inherent anti‐CM interference capability and independent DM response, is widely used in the research field of passive components such as power dividers, crossover, filtering coupler, and BPFs . However, the performance of current balanced dual‐band BPFs is not as good as that of single‐end ones, so balanced dual‐band BPFs need to be further studied.…”

Section: Introductionmentioning

confidence: 99%

A balanced dual‐band bandpass filter with a wide stopband and controllable differential‐mode frequencies and fractional bandwidths

Yue

Wei

et al. 2019

Int J RF Microw Comput Aided Eng

View full text Add to dashboard Cite

In this article, a balanced microstrip dual-band bandpass filter (BPF) is designed. The proposed filter is achieved by employing a microstrip U-shape halfwavelength resonator, a folded stub-loaded resonator and balanced microstrip/ slotline transition structures. The center frequencies and the fractional bandwidths of the two differential-mode (DM) passbands can be controlled independently by changing the physical lengths of the two resonators and the gaps between each resonator, respectively. The balanced microstrip/slotline transition structures can achieve a wideband common-mode (CM) suppression. Meanwhile, the DM passbands are independent from the CM responses, which significantly simplify the design procedure. In addition, a wide DM stopband is also realized. In order to validate the design strategies, a balanced dual-band BPF centered at 2.57 and 3.41 GHz was fabricated and a good agreement between the simulated and measured results is observed.balanced, CM suppression, dual-band filter, folded stub-loaded resonator, wide stopband

show abstract

“…As a result, the conventional QHCs are very bulky for practical use. 1 In recent years, different microstrip transmission line concepts [2][3][4][5][6][7] have been proposed for the design of hybrid couplers with compact size. However, some of these structures are very complex to realize; thus, even though the overall area is reduced, there seems to be an increase in the overall width of the structure.…”

Section: Introductionmentioning

confidence: 99%

“…When compared to other presented microstrip QHC designs in Refs. [3][4][5][6][7] , the USTL design achieves a good size reduction with even better performance. Moreover, it could be easily incorporated in modern wireless communication systems, due to its compactness and simple practical realization.…”

Section: Introductionmentioning

confidence: 99%

Miniaturized quadrature hybrid couplers based on novel U‐shaped transmission lines

Olukoya

Ilić

Basu

et al. 2018

Micro & Optical Tech Letters

View full text Add to dashboard Cite

In this paper, a miniaturized microstrip quadrature hybrid coupler (QHC) using U‐shaped transmission lines (USTLs) is presented. The proposed approach replaces all arms of the conventional QHC with its equivalent USTL to achieve compactness. The proposed coupler structure is designed to operate in the 1.5 GHz (1427‐1518 [MHz]) band which is one of the 5G bands of interest. At such low RF/microwave bands below 3‐4 GHz, the size of the conventional coupler is considerably very large which raises a concern for the next generation networks. The proposed coupler is designed, simulated and fabricated using Rogers 5880 with thickness of 0.79 mm, dielectric constant (εr) of 2.2 and loss tangent of 0.0021. The proposed QHC size is 70% smaller in circuit area (30% relative area) than the conventional equivalent. Simulation and measured results are presented and good matching between the results is observed, confirming the outstanding coupler performance properties. The proposed miniaturized QHC structure will play a vital role for next generation 4G and 5G wireless communication systems operating below 6 GHz.

show abstract

A Balanced Filtering Branch-Line Coupler

Cited by 55 publications

References 8 publications

Dual‐band balanced coupler with wideband common‐mode suppression

Dual‐band balanced coupler with wideband common‐mode suppression

A balanced dual‐band bandpass filter with a wide stopband and controllable differential‐mode frequencies and fractional bandwidths

Miniaturized quadrature hybrid couplers based on novel U‐shaped transmission lines

Contact Info

Product

Resources

About