Exact Design of Band-Stop Microwave Filters

Schiffman, B.M.; Matthaei, G.L.

doi:10.1109/tmtt.1964.1125744

Cited by 103 publications

(25 citation statements)

References 10 publications

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“…Since the curve-fitting process generates a relationship between data sets on x-axis and y-axis independent to their units, the fitting parameters are considered dimensionless in Equation (6). The weights p i 8 i ∈ [1,6] in Equation (6) as function of ϵ r are listed in Table 2, which includes root mean squared error (RMSE) performance indicating accuracy of the curve fitting.…”

Section: Proposed Bsf Design Modelmentioning

confidence: 99%

“…In radio frequency and wireless communication systems, practical BSFs are required to have high inband rejection ratio (RR) and low out-of-band insertion loss. 1,2 Microstrip filters have been used for their various advantages viz. easy fabrication, compact design, and high performance.…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, these types of BSF are more suitable for wideband applications with higher RR in the desired frequency band. 1 In Reference 6, the authors reported a compact microstrip BSF designed using a combination of open stubs and spurline, which had higher RR and 3-dB bandwidth (BW) compared to the filter designed using either stub or spurline. As an application of the spurline, a triangular patch incorporating spurline filters to excite degenerated modes is proposed in Reference 7.…”

Section: Introductionmentioning

confidence: 99%

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An efficient analytical model for microstrip spurline band‐stop filter design

Agarwal

Sharma

2020

Micro & Optical Tech Letters

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An efficient analytical model to design wideband microstrip spurline band‐stop filter (BSF) is proposed. The geometrical parameters of the BSFs are optimized using simulation for the entire range of the desired operating frequency (1‐5 GHz) and the results indicated relatively inferior performance of the filters designed using conventional analytical model. Whereas, in the proposed model, a mathematical function is found by curve fitting of the optimal data set of geometrical parameters optimized by simulation. Therefore, the filters designed using the proposed model achieve almost optimal performance in terms of rejection ratio, bandwidth, and so on, and a better match between desired and actual operating frequency as compared with the conventional design model. To corroborate the claims, the filter prototypes designed using the proposed and conventional models are fabricated and tested. The measured results showed agreement with the simulation results and proved effectiveness of the proposed analytical model to design spurline BSF. The error limit for the proposed model is found within ±0.005% of the optimal design.

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Section: Proposed Bsf Design Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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An efficient analytical model for microstrip spurline band‐stop filter design

Agarwal

Sharma

2020

Micro & Optical Tech Letters

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“…Using the microstrip line with open end stubs separated with quarter wavelength lines at the center frequency of stop band is one of the most widely used method to design a wide band stop filter [8][9][10]. This technique is one of the conventional and more widely used methods.…”

Section: Introductionmentioning

confidence: 99%

Effective Size Reduction Technique for Microstrip Filters

Kumar¹,

Де²

2013

JEMAA

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In this paper an effective size reduction technique using fractal structure is suggested. The proposed technique has been applied on a band stop and a low pass filter separately. This technique provides 42% reduction of size for the band stop filter and about 26% for the low pass counterpart. Both the designed structures are fabricated and the measured results are compared with the simulated results. The proposed technique does not require any recalculation or optimization of dimensions of the filter, and is straightforward to implement. The band stop filter is designed for the center frequency of 3 GHz where as the cut-off frequency for low pass filter is 2.5 GHz. A good agreement between the simulated and measured results is observed. A comprehensible explanation of the proposed technique is also provided.

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“…Spurline filters, first introduced in [6], are potential solutions to harmonic suppression in PAs due to their inherent merits including simple structure, small size, and low cost. As passive component, spurline filters can be simply realized by etching Lshape slots on microstrip lines, and provide bandgap characteristics without any other stubs and etched processing on backside ground plane [7,8].…”

Section: Introductionmentioning

confidence: 99%