Size-Reduction of Dual-Wideband Bandpass Filters Using Bridged-T Coils

Wang, Yun Ru; Lin, Yo Shen

doi:10.1109/access.2019.2908038

Cited by 7 publications

(4 citation statements)

References 19 publications

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“…Among the existing filter topologies, the bridged-T cells are more and more exploited for designing with various networks (Mohan, 1977; Twin-T Notch Filter Design Tool, 2020). This particular analog circuit topology was also developed to improve the radio frequency (RF) and microwave filter performances as the compactness improvement and size reduction (Wang and Lin, 2019; Yao et al , 2009; Lin and Lee, 2013). The bridged-T topology was also extended to design structures as coils, which can be used to miniaturize microwave devices as power dividers (Lin and Lee, 2012).…”

Section: Introductionmentioning

confidence: 99%

Suitability of passive RC-network-based inductorless bridged-T as a bandpass NGD circuit

Lalléchère

Nebhen

Liu

et al. 2021

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Purpose The purpose of this paper is to study, a bridged-T topology with inductorless passive network used as a bandpass (BP) negative group delay (NGD) function. Design/methodology/approach The BP NGD topology under study is composed of an inductorless passive resistive capacitive network. The circuit analysis is elaborated from the equivalent impedance matrix. Then, the analytical model of the C-shunt bridged-T topology voltage transfer function is established. The BP NGD analysis of the considered topology is developed in function of the bridged-T parameters. The NGD properties and characterizations of the proposed topology are analytically expressed. Moreover, the relevance of the BP NGD theory is verified with the design and fabrication of surface mounted device components-based proof-of-concept (PoC). Findings From measurement results, the BP NGD network with −151 ns at the center frequency of 1 MHz over −6.6 dB attenuation is in very good agreement with the C-shunt bridged-T PoC. Originality/value This paper develops a mathematical modeling theory and measurement of a C-shunt bridged-T network circuit.

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Section: Introductionmentioning

confidence: 99%

Suitability of passive RC-network-based inductorless bridged-T as a bandpass NGD circuit

Lalléchère

Nebhen

Liu

et al. 2021

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“…Since the 20 th century, innovative systems that influence the modern way of life were developed thanks to the progressive research and knowledge in circuit engineering. So far, we have mature knowledge on the electronic circuit design of classical functions as filters (Mohan, 1977; Wang & Lin, 2019) and power divider (Lin & Lee, 2012) which use different electrical circuit topologies as bridged‐T. However, some emerging functions as the negative group delay (NGD) (Abuelma'atti & Khalifa, 2018; Meng et al., 2018; Ravelo, Wan, Ge, 2021) are currently initiated and need further research work to be understood by non‐specialist electronic engineers.…”

Section: Introductionmentioning

confidence: 99%

“…Constant circuit design improvement of transceiver constituting elements as filters is necessary (Mohan, 1977). Among the existing filter topologies, the bridged‐T cells are more and more exploited for designing with various networks (Lin & Lee, 2012; Wang & Lin, 2019). This particular analog circuit topology was also developed to improve the RF and microwave filter performances as the compactness improvement and size reduction (Abuelma'atti & Khalifa, 2018; Meng et al., 2018; Ravelo, Wan, Ge, 2021).…”

Section: Introductionmentioning

confidence: 99%

Innovative Study of Resistor Shunt‐Based Bridged‐T Topology With Bandpass Negative Group Delay Behavior

Nebhen

Chan

et al. 2021

Radio Science

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In this paper, new bridged‐T network operating with bandpass (BP) negative group delay (NGD) function is introduced. The circuit design is innovatively based on an inductorless passive RC‐network. The innovative bridged‐T topology is implemented with a R‐shunt configuration. The analytical transfer function of voltages and equivalent impedance‐matrix are carefully calculated. The BP NGD analysis and design of the bridged‐T topology is developed. The BP NGD properties and specifications are analytically investigated. A proof of concept of R‐shunt bridged‐T prototype with a surface‐mounted device printed circuit board is designed, fabricated, and measured to verify the BP NGD behavior from theoretical equations and simulations. As expected, the theoretical, simulation, and measurements results are in very good agreement. From measurement results, the fabricated BP NGD C‐shunt bridged‐T reaches a delay of about −45 ns and a center frequency of about 0.5 MHz over a −3 dB attenuation.

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“…In [17], a dual-wideband bandpass filter based on short-circuited SIRs is proposed. Wang et al [18] used bridged-T coils to replace transmission line sections to design reduced-size dual-band bandpass filters with wide bandwidths. Slotline structure is also an effective way to implement a dual-band filter.…”

Section: Introductionmentioning

confidence: 99%

A Compact Dual-Wideband Bandpass Filter Based on Open-/Short-Circuited Stubs

Liang

Chen

2020

IEEE Access

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A dual-wideband bandpass filter is proposed and analyzed, which is based on loaded open-/short-circuited stubs. The dual-band filter consists of a second-order bandpass filter and a third-order bandpass filter, which can be designed separately. The bandwidth of two passbands can be adjusted by tuning the impedance and the length of the stubs. A dual-band bandpass filter prototype operating at 2.4/5.2 GHz is designed for demonstration. It shows a low insertion loss of 0.3 dB and wide bandwidth of 51.9% at 2.4 GHz and 23.3% at 5.2 GHz. The filter structure is simple without narrow coupling gap between resonators, which is easy for fabrication.

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Size-Reduction of Dual-Wideband Bandpass Filters Using Bridged-T Coils

Cited by 7 publications

References 19 publications

Suitability of passive RC-network-based inductorless bridged-T as a bandpass NGD circuit

Suitability of passive RC-network-based inductorless bridged-T as a bandpass NGD circuit

Innovative Study of Resistor Shunt‐Based Bridged‐T Topology With Bandpass Negative Group Delay Behavior

A Compact Dual-Wideband Bandpass Filter Based on Open-/Short-Circuited Stubs

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