Novel Corrugated Coupled-Line Stage with Ideal Frequency Response and Its Application to Bandpass Filter Design with Multi-Harmonic Suppression

Kuo, Jen-Tsai; Lok, U Hou; Wu, Meng-Huan

doi:10.1109/mwsym.2007.380549

Cited by 5 publications

(3 citation statements)

References 12 publications

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“…This is very close to that of a design with only uniform coupled stages. The effect of corrugation on filter performance will become significant at higher frequencies, say, beyond 10 GHz [27].…”

Section: Methodsmentioning

confidence: 99%

Corrugated parallel-coupled line bandpass filters with multispurious suppression

Kuo

2007

IET Microw. Antennas Propag.

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Corrugated coupled stages are devised to design bandpass filters with multispurious suppression. Through two-port analysis, the suppression is found critically dependent on equality of the even and odd mode phase velocities at even harmonics of design frequency f o. Quarter-wave (l/4) corrugated stages are tuned to allocate inherent transmission zeros at both 2f o and 4f o , and 6f o for some structures, so that the circuit is free of spurious at these frequencies. Coupled stages with proper coupling lengths are arranged to cancel unwanted peaks at 3f o , 6f o and 7f o , and tapped input/output scheme is employed to tackle those at 3f o and 5f o. Measured data of designed filters show rejection levels better than 30 dB in upper stopband. Three circuits are fabricated and measured to demonstrate the idea.

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Section: Methodsmentioning

confidence: 99%

Corrugated parallel-coupled line bandpass filters with multispurious suppression

Kuo

2007

IET Microw. Antennas Propag.

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“…In practice, it is well known that different modal phase velocities will cause spurious response at . We have proposed several approaches, e.g., [16] and [17], to tackle this problem. In the proposed synthesis, it is worth mentioning the assumption that equal modal phase velocities have a negligible effect on the accuracy of passband response and bandwidth.…”

Section: Solutions and Experimentsmentioning

confidence: 99%

New Synthesis of Parallel-Coupled Line Bandpass Filters With Chebyshev Responses

Chin

Chiou

Kuo

2008

IEEE Trans. Microwave Theory Techn.

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Parallel-coupled line filters with Chebyshev passbands are synthesized based on the insertion-loss functions derived by converting the composite matrices of all coupled stages. With the synthesis, both the electromagnetic simulation and measurement results have accurate in-band response and bandwidth. Simultaneous equations for Chebyshev filters of order 9 are derived for determining geometric parameters of the coupled stages. The tradeoff between circuit bandwidth and ripple level is discussed. In experiments, three planar or quasi-planar structures, including the coupled-line with aperture in the ground plane, the three-line microstrip, and the broadside-coupled lines, are employed to realize the end stages for implementing the high coupling levels. Experimental filters of order up to nine with fractional bandwidth of 30% or 40% are fabricated and measured. The results show good agreement with predictions by the theory and simulation. Index Terms-Bandpass filters, Chebyshev response, insertionloss function, parallel-coupled line filter, strong coupling. Kuo-Sheng Chin (S'05-M'06) received the M.S.E.E. degree from Syracuse University, Syracuse, NY, in 1993, and the Ph.D. degree in com-

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“…Moreover, the transmission zero may shift upwards to the upper operating frequency band. To compensate the unbalanced even-and odd-mode phase velocities resulting from the coupled line fabricated with microstrip circuits, capacitive [1] or inductive [2] compensation, corrugated lines [3], or wiggly lines [4] have been proposed. However, these design procedures are relatively complicated.…”

mentioning

confidence: 99%

Compensated microstrip coupled line and its application on impedance transformer

Tang

Chen

2012

Electron. Lett.

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Novel Corrugated Coupled-Line Stage with Ideal Frequency Response and Its Application to Bandpass Filter Design with Multi-Harmonic Suppression

Cited by 5 publications

References 12 publications

Corrugated parallel-coupled line bandpass filters with multispurious suppression

Corrugated parallel-coupled line bandpass filters with multispurious suppression

New Synthesis of Parallel-Coupled Line Bandpass Filters With Chebyshev Responses

Compensated microstrip coupled line and its application on impedance transformer

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