A New Synthesis Method for Dual-Band Microwave Filter Design with Controllable Bandwidth

Yim, H.-Y.A.; Wong, Fai-Leung; Cheng, K.-K.M.

doi:10.1109/apmc.2007.4555016

Cited by 7 publications

(6 citation statements)

References 11 publications

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“…Experimental results verify the effectiveness of the proposed methods. The methods are fully compatible with the conventional filter synthesis method based on inverters and resonators, allowing for a very systematic design procedure to develop filters with various types of coupled lines [13–15, 23] as well as transmission lines [17, 23]. Moreover, the filter has a compact size with superior stopband performance that can be predicted easily.…”

Section: Resultsmentioning

confidence: 99%

“…Therefore, it relies largely on full-wave simulations to calculate the coupling coefficients. Furthermore, the method is valid for coupled-line filters only, whereas the proposed method can be applied to any type of filters that can be synthesized using inverters and resonators, including transmission-line filters [17, 23]. Most importantly, size reduction accompanies the proposed method, which can be controlled at the initial design step.…”

Section: Introductionmentioning

confidence: 99%

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Wideband suppression of spurious response for microstrip filters based on coupled lines of incommensurate lengths

Lee

Yoon

et al. 2014

Int. J. Microw. Wireless Technol.

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This work demonstrates design methods that can achieve remarkable enhancement in the stopband response of microstrip coupled-line filters. The frequencies of resonance and/or the transmission zeros of a coupled-line section can be controlled by its length. Therefore, by constructing a filter with coupled lines of incommensurate lengths such that these frequencies do not overlap, substantial improvement in the stopband response can be obtained. Besides its compact structure and simple design procedure, an unprecedented performance is demonstrated experimentally in which the transmission level is maintained below −20 dB up to as high as 11.9 f0 for a third-order filter, where f0 is the center frequency.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Wideband suppression of spurious response for microstrip filters based on coupled lines of incommensurate lengths

Lee

Yoon

et al. 2014

Int. J. Microw. Wireless Technol.

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show abstract

“…The originality of the proposed filter-synthesis method can be summarised by the following: First, the proposed method allows a dual-band filter to have different bandwidths without any complex structural modification to a general filter structure. Second, the classical restriction that requires the coupled-line dual-band filters to have the same J-inverter values at the two centre frequencies has been abandoned [20][21][22][23]. Therefore, the two passbands can be designed with complete independence.…”

Section: Proposed Filter-synthesis Methodsmentioning

confidence: 99%

“…Otherwise, relatively complex structural modifications, such as stepped-impedance structures [20] or asymmetric coupled lines [21,22], are required to achieve bandwidth independence between the two passbands. In addition, the modification may impose a limitation on the filter design or performance; for instance, even-ordered Chebyshev filters cannot be realised [23], or the maximum ratio of the two centre frequencies is limited to 1:3 [21].…”

Section: Introductionmentioning

confidence: 99%

Dual‐band filter with fully independent passbands based on unequal‐length coupled lines and stubs

Lee

2017

IET Microwaves, Antennas & Propagation

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In this work, a dual‐band filter that has completely independent passbands is demonstrated. The complete independence of the two passbands is achieved by simultaneously abandoning the classical restriction on electrical lengths for dual‐band operation and allowing all the components to have different lengths. As a result, the proposed filter has different sets of J‐inverter values and susceptance slope parameters independently at two centre frequencies. Therefore, the two passbands can be designed to have not only different bandwidths, but also different passband responses simultaneously; i.e. one passband can be designed to be a Chebyshev type while the other is a Butterworth type, or a Chebyshev type with different passband ripple levels. Rigorous design equations are derived and various design curves are provided to discuss the practicality of the proposed method. Finally, two filters with different bandwidths and passband types are demonstrated experimentally. The excellent agreement between the simulated and measured results verifies the practicality of the proposed method.

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“…The microstrip filter is a two port network that allows the desired frequency while attenuating the unwanted signal frequency of the filter [1][2]. Microwave multi-band especially dual-band bandpass filter becomes important component circuits in modern wireless communication system since it helps to enhance the reliability [3]. They also need to be compact and high selectivity.…”

Section: Introductionmentioning

confidence: 99%

Design of compact multi-mode microstrip resonator filters for dual-band application

Rosli¹,

Akhir²,

Ibrahim³

et al. 2019

IJEECS

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<span>This paper presents the design of compact multi-mode microstrip resonator filters for dual-band application. The design is simulated using Advanced Design System (ADS) 2016 software. The benefit of the proposed filter is found to have a dual-mode frequency, where the odd-mode resonant frequency is the fundamental frequency represented by the length of the resonator while the even-mode resonant frequency is represented by the length of the stub. To validate the design, a prototype is fabricated on Rogers RO4003C substrate and measured using PNA Network Analyzer.</span>

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A New Synthesis Method for Dual-Band Microwave Filter Design with Controllable Bandwidth

Cited by 7 publications

References 11 publications

Wideband suppression of spurious response for microstrip filters based on coupled lines of incommensurate lengths

Wideband suppression of spurious response for microstrip filters based on coupled lines of incommensurate lengths

Dual‐band filter with fully independent passbands based on unequal‐length coupled lines and stubs

Design of compact multi-mode microstrip resonator filters for dual-band application

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