Compact differential bandpass filter with a narrow notched band using APCL structure suitable for UWB application

Amirian, Mohsen; Karimi, Gholamreza; Lalbakhsh, Ali; Bayati, Mohammad-sajad

doi:10.1016/j.mejo.2015.06.014

Cited by 14 publications

(8 citation statements)

References 24 publications

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“…FR. One of the mainstream BPF design techniques is the use of coupled lines as the primary structure of the filter to provide the initial pass-band, which can be tailored later by various techniques 2,[35][36][37][38] . In this work, two open-circuited stubs and a bended line are coupled, forming FR shown in Fig.…”

Section: Design Processmentioning

confidence: 99%

Varactor-tuned wideband band-pass filter for 5G NR frequency bands n77, n79 and 5G Wi-Fi

Golestanifar

Karimi

Lalbakhsh

2022

Sci Rep

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A wide-band band-pass filter (BPF) using coupled lines, rectangular stubs and Stepped-Impedance Resonators (SIRs) is presented in this paper. The proposed BPF operates over a large pass-band from 3.15 to 6.05 GHz covering 5G New Radio (NR) frequency Bands n77, n79 and 5G Wi-Fi, which includes the G band of US (3.3 to 4.2 GHz), 5G band of Japan (4.4 to 5 GHz) and 5G Wi-Fi (5.15 to 5.85 GHz). The presented filter has a maximum pass-band Insertion-Loss (IL) of 2 dB, a sharp roll-off rate and suppresses all the unwanted harmonics from 4.2 GHz up to 12 GHz with a 15 dB attenuation level. The performance of each section can be analyzed based on lumped-element circuit models. The electrical size of the BPF is 0.258 λg × 0.255 λg, where λg is the guided wavelength at the central frequency. The design accuracy is verified through implementing and testing the final BPF. The pass-band band-width can be controlled by adding the varactor diodes. A good relationship between the band-width and the varactor diodes are extracted by the curve fitting technique.

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Section: Design Processmentioning

confidence: 99%

Varactor-tuned wideband band-pass filter for 5G NR frequency bands n77, n79 and 5G Wi-Fi

Golestanifar

Karimi

Lalbakhsh

2022

Sci Rep

Self Cite

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“…It needs to be mentioned that re-prototyping is required for the practical implementation of this tunability. Quality factor (Q. factor) is defined as the ratio of operating frequency and bandwidth as shown in (4). Figure 12 shows the Q. factor of the proposed filter as a function of the three physical parameters of A18, A21 and A14.…”

Section: Passbands Optimization and Tuning Of The Filtermentioning

confidence: 99%

“…Microstrip technology has been widely used in modern communication systems since it is a mature and highly reliable technology for microwave-and millimeter-wave applications [1][2][3][4][5][6][7][8][9][10][11]. In particular, multiband bandpass filters (BPFs) have been utilized in wireless communication transceivers to separate frequency spectrum in different bands.…”

Section: Introductionmentioning

confidence: 99%

A Compact C-Band Bandpass Filter with an Adjustable Dual-Band Suitable for Satellite Communication Systems

et al. 2020

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A narrowband dual-band bandpass filter (BPF) with independently tunable passbands is presented through a systematic design approach. A size-efficient coupling system is proposed with the capability of being integrated with additional resonators without increasing the size of the circuit. Two flag-shaped resonators along with two stepped-impedance resonators are integrated with the coupling system to firstly enhance the quality response of the filter, and secondly to add an independent adjustability feature to the filter. The dual passband of the filter is centered at 4.42 GHz and 7.2 GHz, respectively, with narrow passbands of 2.12% and 1.15%. The lower and upper passbands can be swept independently over 600 MHz and 1000 MHz by changing only one parameter of the filter without any destructive effects on the frequency response. According to United States frequency allocations, the first passband is convenient for mobile communications and the second passband can be used for satellite communications. The filter has very good in- and out-of-band performance with very small passband insertion losses of 0.5 dB and 0.86 dB as well as a relatively strong stopband attenuation of 30 dB and 25 dB, respectively, for the case of lower and upper bands. To verify the proposed approach, a prototype of the filter is fabricated and measured showing a good agreement between numerically calculated and measured results.

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“…Odd‐ and even‐mode analyses Refs. are applied to this structure for deriving the necessary equations.…”

Section: Circuit Structure and Design Proceduresmentioning

confidence: 99%

A broadband out-of-phase gysel power divider based on a dual-band circuit with a single fixed isolation resistor

Mousavi

Rahimi

Malakooti

et al. 2016

Int J RF and Microwave Comp Aid Eng

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Based on the double‐sided parallel‐strip lines with an inserted conductor as a virtual ground, a high power divider with dual‐band/broadband response and frequency‐independent 180° phase difference between the output ports is implemented in this paper. The circuit topology employs a single commercially available external isolation resistor as well as moderate line impedances (15–100 ohm), making it suitable for high‐power applications. Precise closed‐form design equations on the basis of even‐ and odd‐mode analysis are derived. In addition to the wide range of frequency band ratios from 1 to 2.65, broadband response is also obtained by selecting the proper value of frequency band ratios. To substantiate the design equations and theory, a circuit with 2:1 frequency ratio and 84.5% bandwidth referring to 16 dB isolation and 12 dB return loss values is developed. To the authors' knowledge, this is the widest bandwidth reported for out‐of‐phase high power dividers. © 2016 Wiley Periodicals, Inc. Int J RF and Microwave CAE, 2016.

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Compact differential bandpass filter with a narrow notched band using APCL structure suitable for UWB application

Cited by 14 publications

References 24 publications

Varactor-tuned wideband band-pass filter for 5G NR frequency bands n77, n79 and 5G Wi-Fi

Varactor-tuned wideband band-pass filter for 5G NR frequency bands n77, n79 and 5G Wi-Fi

A Compact C-Band Bandpass Filter with an Adjustable Dual-Band Suitable for Satellite Communication Systems

A broadband out-of-phase gysel power divider based on a dual-band circuit with a single fixed isolation resistor

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