Compact Balanced Dual-Band BPFs Based on Short and Open Stub Loaded Resonators With Wide Common-Mode Suppression

Wei, Feng; Yu, Jinhua; Zhang, Chi Yuan; Zeng, Cao; Shi, Xiao Wei

doi:10.1109/tcsii.2020.2994632

Cited by 31 publications

(20 citation statements)

References 13 publications

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“…To obtain an excellent skirt phenomenon, the filter increases the number of resonators [8]. However, if the filter is increased, the insertion loss is increased [8,9]. In particular, a BPF using both SLR and SIR was able to obtain the tri−band characteristics of a wide bandwidth by adjusting the stub length and impedance ratio [10,11].…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, there is a case for using a sextuple−mode resonator to solve the bandwidth [13] however, the filter has many stubs. Therefore, the filter has the disadvantages of a complex structure and a size increase [9].…”

Section: Introductionmentioning

confidence: 99%

“…To obtain tri−band response characteristics, it is analyzed that a spiral−shaped resonator has no transmission−zero characteristics, so the cut−off frequency characteristic is not excellent [15]. To improve the cut−off frequency characteristics, this filter connected various resonators, but the size of the device increased [9]. A band−pass filter with a coupled loaded self−SIR structure has dual−band characteristics and transmission-zero characteristics [16].…”

Section: Introductionmentioning

confidence: 99%

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Design of Dual Ultra–Wideband Band–Pass Filter Using Stepped Impedance Resonator λg/4 Short Stubs and T–Shaped Band-Stop Filter

Yoon

Kim

2021

Electronics

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Portable wireless communication systems are increasingly in demand in small sizes for human convenience. In wireless communication systems, the performance, size, and unit cost are very important. A band−pass filter is important to sharp cut–off frequency characteristics, size, and frequency selectivity in wireless communication systems. The band−pass filter has three types of techniques in the transmission−zero method, stub−loaded resonator, and stepped impedance resonator for the sharp cut−off frequency characteristic, adjustable bandwidth, and excellent frequency response characteristics. To obtain these characteristics, the impedance ratio and length of a stub are mainly adjusted. It also utilizes a multi–mode technique to increase bandwidth. However, it is analyzed that the problem of reducing the size of the device still remains. To solve these problems, the paper is applied to a stub−loaded resonator and a stepped impedance resonator to control the impedance ratio and the length of the stub to obtain the results of the transmission−zero method, bandwidth control, and size reduction through the folded structure. Dual−band bandwidth was secured by integrating a T−shaped band−stop filter. The designed band–pass filter has center frequencies of 243 GHz and 7.49 GHz, and the insertion loss of a proposed band−pass filter is 0.102 dB and 0.103 dB. Additionally, the return loss of a proposed band−pass filter is 19.13 dB and 19.96 dB, respectively. The bandwidth of a filter is 120% and 105%, respectively. The size of the filter is 0.0708 λg × 0.0533 λg. The designed filter has a good skirt phenomenon, small size, low insertion loss, and dual−band characteristics.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Design of Dual Ultra–Wideband Band–Pass Filter Using Stepped Impedance Resonator λg/4 Short Stubs and T–Shaped Band-Stop Filter

Yoon

Kim

2021

Electronics

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“…For the case of equal power division in the two bands, the appropriate values of d 02 (d 03 ) and d 2 (d 3 ) are respectively 5.5 and 14.3 mm to meet the requirement of 2Q e1 and 2Q e2 . In this case, Q i eL n and Q iþ2 eL n should be 4Q e1 and 4Q e2 , respectively, according to Equation (9). After adjusting the coupling coefficients to match the value of Q e , the coupling matrix can be expressed as: The theoretical response and simulated result match each other in the passbands, as shown in Figure 9.…”

Section: Dual-band Filtering Power Divider Based On a Quad-mode Dielectric Resonatormentioning

confidence: 99%

“…To obtain the power split ratio of 1:1 in the lower band and 2:1 in the higher band, Q i eL 1 andQ i eL 2 are both equal to 4Q e1 whereas Q iþ2 eL 1 = 3Q e1 and Q iþ2 eL 2 = 6Q e1 according to Equation (9). The probe lengths of Ports 2 and 3 need to be updated accordingly, whereas the other parameters remain unchanged.…”

Section: Dual-band Filtering Power Divider Based On a Quad-mode Dielectric Resonatormentioning

confidence: 99%

Dual‐band filtering power divider with independent in‐band power split ratio using a single quad‐mode dielectric resonator

Qin

et al. 2021

IET Microwaves Antenna & Prop

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A design approach is presented based on insights into power division among modes for a dual‐band filtering power divider using a single multimode resonator. The relationship between the energy of the input port under different modes and the corresponding external quality factor (Qe) is analysed. Then, the power distribution among the in‐band modes and between output ports can be all expressed by Qe. Therefore, the synthesis of a coupling matrix to achieve independent power distribution in the two bands is simplified. For further verification, a quad‐mode dielectric resonator with independently controllable modes is designed. Based on this, dual‐band filtering power dividers with equal and unequal power split ratios (1:1 in the lower band and 2:1 in the higher band) are simulated and implemented. The simulation and measurement agree, proving the correctness of the approach.

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Design of dual‐band filtering phase shifter based on E‐network

Wu,

Liu,

Wang

et al. 2024

Circuit Theory & Apps

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SummaryThis letter presents a design method for dual‐band filtering phase shifters, which is based on E‐type networks. The dual‐band filtering function and different predetermined phase shift values are realized by E‐type networks and two delay lines. The dual‐band bandwidth and frequency ratio can be adjusted. Moreover, the dual‐band phase‐shift bandwidth has been extended. Finally, a dual‐band filtering phase shifter with simple structure and good filtering characteristics is fabricated and measured, which can provide 90 ± 5° and 225 ± 5° phase shifts at 1.75–2.58 GHz and 4.38–5.78 GHz, respectively. All results exhibit a good agreement between the electromagnetic (EM) simulation and measurement results.

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Compact Balanced Dual-Band BPFs Based on Short and Open Stub Loaded Resonators With Wide Common-Mode Suppression

Cited by 31 publications

References 13 publications

Design of Dual Ultra–Wideband Band–Pass Filter Using Stepped Impedance Resonator λg/4 Short Stubs and T–Shaped Band-Stop Filter

Design of Dual Ultra–Wideband Band–Pass Filter Using Stepped Impedance Resonator λg/4 Short Stubs and T–Shaped Band-Stop Filter

Dual‐band filtering power divider with independent in‐band power split ratio using a single quad‐mode dielectric resonator

Design of dual‐band filtering phase shifter based on E‐network

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