Design of the Compact Parallel-Coupled Lines Wideband Bandpass Filters Using Image Parameter Method

Ye, Chang-Sin; Su, Yan–Kuin; Weng, Min‐Hang; Hung, Cheng‐Yuan; Yang, Ru‐Yuan

doi:10.2528/pier09073002

Cited by 30 publications

(22 citation statements)

References 18 publications

(28 reference statements)

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“…Moreover, parallel coupled-lines and interdigital coupled-lines are widely used in bandpass filter design to reject the lower and upperstopbands due to their bandpass properties [20][21][22][23][24][25][26][27][28].…”

Section: Introductionmentioning

confidence: 99%

Rotationally Symmetric Coupled-Lines Bandpass Filter With Two Transmission Zeros

Wong¹,

Wang²,

Chen³

et al. 2013

PIER

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Abstract-A rotationally symmetric short-circuited stub-loaded structure is proposed to design a microstrip-line bandpass filter with two transmission zeros near the lower and upper cut-off frequency edges of operating millimeter-wave bands. Furthermore, interdigital coupled-lines and additional resonators are integrated into the proposed rotationally symmetric bandpass filter to improve the out-of-band rejection. As design examples, the in-band and out-of-band performances of two filter prototypes using single layer microstrip-lines are designed and experimentally examined. The measured results show that the filter without any interdigital coupledlines achieves a passband insertion loss of 0.97 dB at 40 GHz and out-ofband rejection of larger than 23 dB, while the filter with the interdigital coupled-lines realizes the suppressions in lower and upper-bands of, respectively, larger than 30 dB and 19 dB for the overall insertion loss of 2.1 dB at 40 GHz.

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Section: Introductionmentioning

confidence: 99%

Rotationally Symmetric Coupled-Lines Bandpass Filter With Two Transmission Zeros

Wong¹,

Wang²,

Chen³

et al. 2013

PIER

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“…Parallel coupled lines are widely used for building various passive components [23][24][25] because of their simple configurations and easy fabrication. However, for edge-coupled microstrip lines, it is difficult to get such low odd-mode impedance as shown in Figure 5(b).…”

Section: Modified Lange Coupling Structurementioning

confidence: 99%

A Compact Microstrip Rat-Race Coupler With Modified Lange and T-Shaped Arms

Liu¹,

Wu²,

Yin³

2011

PIER

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Abstract-A compact microstrip rat-race coupler is proposed with a new phase inverter which is realized by a modified Lange coupling structure with a slotted ground plane and a floating-potential conductor. Based on the even-and odd-mode theory, its parameters are generally synthesized. In order to further miniaturize the rat-race coupler, a T-shaped line is utilized. A prototype operating at 2.0 GHz is designed and fabricated for verification. The circumference of our proposed rat-race coupler is only 0.52λ. Its in-phase and out-of-phase bandwidths are also enhanced, with reasonable agreement obtained between its simulated and measured S-parameters.

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“…The methodologies for designing microwave filters are known for a long time but a lot of researchers are still introducing new solutions (cf. [7][8][9][10][11][12][13][14]). In this paper, we are focusing on the related problem of coupling coupling matrix extraction.…”

Section: Introductionmentioning

confidence: 99%

The Analytic Extraction of the Complex-Valued Coupling Matrix and Its Application in the Microwave Filter Modeling

Gulgowski¹,

Michalski²

2012

PIER

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Abstract-The idea behind the coupling matrix identification is to find the coupling matrix corresponding to the measured or designed scattering characteristics of the microwave filter. The typical attitude towards coupling matrix parameter extraction is to use some optimization methods to minimize the appropriate cost function. In this paper, we concentrate on the analytic solutions -how they may be found and their application in further optimization processes. In general case, the suggested method generates complex-valued coupling matrix. For a special case of the filter without cross-couplings we give fast and simple recursive method of finding such complexvalued coupling matrix. The method is based on Laplace's formula for expanding the determinant. The complex-valued coupling matrix is used as a good starting point for the optimization methods to find the regular coupling matrix. The examples are presented showing that the optimization arrives to global minimum starting from real parts of complex-valued entries considerably more often than when the starting point is selected randomly.

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Design of the Compact Parallel-Coupled Lines Wideband Bandpass Filters Using Image Parameter Method

Cited by 30 publications

References 18 publications

Rotationally Symmetric Coupled-Lines Bandpass Filter With Two Transmission Zeros

Rotationally Symmetric Coupled-Lines Bandpass Filter With Two Transmission Zeros

A Compact Microstrip Rat-Race Coupler With Modified Lange and T-Shaped Arms

The Analytic Extraction of the Complex-Valued Coupling Matrix and Its Application in the Microwave Filter Modeling

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