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line breaking into a pair of smaller coupled lines that rejoin after a quarter-wavelength distance. Only one of the input ports of the coupled lines is connected to the feed microstrip, as shown in the figure below. The orange area of the illustration is the microstrip transmission line conductor and
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The distance between the two coupled lines can be selected appropriately to fine-tune the filter. The smaller the distance, the narrower the stop-band in terms of rejection. Of course that is limited by the circuit-board printing resolution, and it is usually considered at about 10% of the input
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The gap between the input microstrip line and the one open-circuited line of the coupler has a negligible effect on the frequency response of the filter. Therefore, it is considered approximately equal to the distance of the two coupled lines.
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C. Nguyen and K. Chang, “On the analysis and design of spurline bandstop filters,” IEEE Trans. Microw. Theory Tech., vol. 33, no. 12, pp. 1416–1421, Dec. 1985.
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of the bandstop filter, measured - of course - in the microstrip line material. This is the most important parameter of the filter that sets the rejection band.
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form in 1964. Bates adapted the design for microstrip in 1977. Nguyen and Hsieh improved the analysis for microstrip implementations in 1983.
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because of their inherently compact design and ease of integration: they occupy surface that corresponds only to a quarter-wavelength
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transmission lines. Spurlines usually exhibit moderate to narrow-band rejection, at about 10% around the central frequency.
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Hall, Peter S.; Lee, E.; Song, C. T. P., "Planar inverted-F antennas", pp. 197-227, in
Waterhouse, Rod (ed),
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Cam Nguyen; Kai Chang, "Millimeter wave planar integrated circuit filters", ch. 2 in
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A spurline filter was first proposed by
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Spurlines can also be used in printed antennae such as the
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Figure : Microstrip
Spurline Notch Filter (Top View)
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IEEE Transactions on
Microwave Theory and Techniques
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IEEE MTT-S International
Microwave Symposium Digest
239:"Design of microstrip spur-line band-stop filters"
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16:Printed-circuit layout acting as a bandstop filter
250:Millimeter wave printed circuit spurline filters"
45:(notch) characteristics, most commonly used with
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243:IEEE Journal on Microwave Optics and Acoustics
198:Topics in Millimeter Wave Technology: Volume 1
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228:"Exact design of band-stop microwave filters"
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177:Printed Antennas for Wireless Communications
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119:corresponding to the central rejection
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226:B. M. Schiffman; G. L. Matthaei,
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179:, John Wiley & Sons, 2008
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331:Distributed element circuits
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108:{\displaystyle \lambda _{g}}
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117:wavelength
70:microstrip
47:microstrip
157:stripline
121:frequency
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43:band-stop
36:microwave
21:spur line
145:tri-band
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151:History
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