Sharp-Rejection Wideband Bandstop Filter Using Stepped Impedance Resonators

Chen, Fu‐Chang; Li, Run‐Shuo; Qiu, Jie-Ming; Chu, Qing‐Xin

doi:10.1109/tcpmt.2016.2646724

Cited by 37 publications

(22 citation statements)

References 24 publications

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“…The coupled line (Z 1e , Z 1o ) and inner transmission line (Z 4 ) constitute a conventional hairpin BSF, which is in parallel with the outer transmission line (Z 2 , Z 3 ). The architecture of the equivalent circuit of Figure 1(b) is originally obtained from the equivalences of an LC π-section for hairpin structure [6], an inductor for a high impedance transmission line and an LC T-section for two cascaded transmission lines [5,6,8]. Figure 2 shows the detailed equivalences.…”

Section: Analysis and Designmentioning

confidence: 99%

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Analysis and Design of a New Ring Bandstop Filter Using Lumped Equivalent Circuit

Fu¹

2020

PIER Letters

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A new ring wideband bandstop filter (BSF) and its exact design method is proposed and investigated in this letter. The BSF is devised by introducing an additional transmission line to a traditional hairpin bandstop filter in parallel, hence giving enhanced selectivity and attenuation performance. A lumped lowpass equivalent circuit is introduced to explain the mechanism of the filter. Rigorous correspondence between the BSF and its equivalent circuit is established by comparing their even-and odd-mode input admittances. This enables the BSF to be synthesized the same way as lumped filters. Both the BSF and the method have been documented by a design example.

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Section: Analysis and Designmentioning

confidence: 99%

“…One shunt stub can normally generate one TZ. Multiple TZs will require multiple stubs or multiple stepped stubs [4,5], which will increase size and loss inevitably. The technique of cross coupling is then appreciated due to the ability of generating TZs from building multiple transmission routes without increasing filter size.…”

Section: Introductionmentioning

confidence: 99%

Analysis and Design of a New Ring Bandstop Filter Using Lumped Equivalent Circuit

Fu¹

2020

PIER Letters

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“…If the two line sections with electrical lengths θ 1 and θ 2 have the characteristic impedances of Z 1 and Z 2 , then total length θ T of the SIR is given by Eq. (5) [12,13],…”

Section: Common Mode (Cm) Operationmentioning

confidence: 99%

Tunable Multiband Balanced Bandstop Filter With High CMRR

Borah¹,

Kalkur²

2019

PIER C

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A novel and effective architecture of tunable multiband balanced bandstop filter (MBBSF) is introduced for the first time in this paper. Each symmetrical bisection of the proposed branch line structure consists of K series cascaded tunable N-band sections to realize a reconfigurable K-th order N-band response in differential mode (DM) operation. The main advantage lies on the fact that all these N bands can be tuned simultaneously or each band independently. Moreover, it maintains a high common mode rejection ratio (CMRR) for all the tuning states by incorporating open stubs in the symmetrical plane of the balanced structure. To validate the proposed topology, a balanced dualband tunable BSF is designed where the two DM stopbands tune in the range of 1.16 GHz-1.29 GHz and 1.6 GHz-1.76 GHz, respectively. The lower and upper bands maintain a constant absolute bandwidth (ABW) of 115 MHz and 135 MHz, respectively, and stopband rejection is better than 20 dB for each band. The fabricated prototype occupies an area of 0.31λ 2 g , and the experimental results show a good agreement with the simulation results.

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“…Bunlar içerisinde açık halka rezonatörler [3], paralel kuplajlı hatlar [4]- [7], basamak empedans tipi rezonatörler [8], [9], açık devre sonlandırmalı yan hatlar [11], [12], sıklıkla ele alınmış tasarım metotlarıdır. Açık halka rezonatörün kullanıldığı geniş bantlı bant durduran filtre tasarımına [3]'te rastlanmaktadır.…”

Section: Introductionunclassified

“…Bu sayede geniş bir durdurma bandı içerisinde beş iletim sıfırının elde edilmesine yönelik [4], bant dışı yansıma sıfırları sayısının artırılmasına yönelik [5], [6], yüksek durdurma oranının elde edilmesine yönelik [7] çalışmalar gerçekleştirilmiştir. Basamak empedans tipi rezonatörler de, giriş-çıkış portları arasında farklı empedanslara sahip iletim hatlarının yerleştirilmesi suretiyle ele alınan bir diğer tasarım metodu olarak literatürde yerini almıştır [8], [9]. Bu çalışmaların yanı sıra, halka rezonatörün içerisine yerleştirilmiş açık devre sonlandırmalı yan hatlar ile tasarlanmış filtreler [10], basamak empedans tipi rezonatörlerde ve paralel kuplajlı hatlarda açık devre sonlandırmalı yan hatların kullanılmasıyla tasarlanmış filtreler de yine literatüre kazandırılmış diğer tasarım metotlarıdır [11], [12].…”

Section: Introductionunclassified

Interdigital capacitor loaded wideband bandstop microstrip filter design

Görür¹

2018

Pamukkale J Eng Sci

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Bu makalede, kompakt bir yapıya sahip geniş bantlı bant durduran mikroşerit filtre tasarımı önerilmektedir. Önerilen filtre, kıvrılmış mikroşerit hatlarla oluşturulmuş menderes biçimli açık halka rezonatörün alt kenarına kapasitif yükleme yapılarak tasarlanmaktadır. Giriş-çıkış portları birbirine yüksek empedansa sahip bir iletim hattı ile bağlı olup, kapasitif yükleme bu hatta interdijital kapasitörler vasıtasıyla yapılmaktadır. Tasarlanan filtrede durdurma bandının üst ve alt frekanslarında oluşturulan yansıma sıfırları sayesinde yüksek seçicilik elde edilebilmektedir. Bu yansıma sıfırlarının kontrolü devredeki çeşitli parametrelerdeki değişimlerle sağlanmaktadır. Ayrıca, durdurma bandı içerisinde iki adet iletim sıfır mevcuttur. Durdurma bandının bant genişliği ve merkez frekansı da kontrol edilebilmektedir. Tasarlanan filtre, önerilen çalışmaların geçerliliğinin ortaya konulabilmesi amacıyla 10.2 bağıl dielektrik sabitine ve 1.27 mm taban kalınlığına sahip RT/Duroid malzeme üzerinde imal edilmiştir. Yaklaşık 2.57 GHz merkez frekansında 1.22 GHz bant genişliğine sahip filtrenin ölçüm sonuçlarının simülasyon sonuçlarıyla oldukça iyi bir uyum içerisinde olduğu gözlenmiştir. Ölçüm sonuçlarında yansıma kaybı ve bant içi araya girme kaybı sırasıyla-0.3 dB ve-20 dB'den daha iyi olacak şekilde elde edilmiştir. In this paper, a wideband microstrip bandstop filter design having a compact size is proposed. The proposed filter is designed by making a capacitive loading to the bottom side of a meandered open loop resonator formed by folded microstrip transmission lines. Input-output ports are connected to each other with a high impedance transmission line and capacitive loading is achieved by interdigital capacitors to this transmission line. In the designed filter, high selectivity can be obtained by means of reflection zeros occurred at the upper and lower frequencies of the stopband. Control of those reflection zeros is achieved by the changes in various parameters of the circuit. Besides, there are two transmission zeros inside the stopband. Bandwidth and center frequency of the stopband can also be controlled. In order to prove the validity of the proposed study, the designed filter was fabricated on an RT/Duroid substrate having a dielectric constant of 10.2 and a thickness of 1.27 mm. Measured results of the filter with a center frequency of approximately 2.57 GHz and a bandwidth of 1.22 GHz have been observed in a very good agreement with the simulated results. In the measurements, return loss and in-band insertion loss have been obtained as-0.3 dB and better than-20 dB, respectively.

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Sharp-Rejection Wideband Bandstop Filter Using Stepped Impedance Resonators

Cited by 37 publications

References 24 publications

Analysis and Design of a New Ring Bandstop Filter Using Lumped Equivalent Circuit

Analysis and Design of a New Ring Bandstop Filter Using Lumped Equivalent Circuit

Tunable Multiband Balanced Bandstop Filter With High CMRR

Interdigital capacitor loaded wideband bandstop microstrip filter design

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