Article

Accurate Wide-Range Design Equations for the Frequency-Dependent Characteristics of Parallel Coupled Microstrip Lines (Corrections)

IEEE Transactions on Microwave Theory and Techniques (Impact Factor: 2.94). 04/1985; DOI: 10.1109/TMTT.1985.1133005
Source: IEEE Xplore

ABSTRACT In the above paper, the following misprints have to be corrected.

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    • "[10] [11] Designing equations for the coupled line parameters such as space gap between lines and line widths and lengths, can be found in classical microwave books.[12] [13] Closed-form expressions for modeling the frequency dependency of the even-and odd-mode characteristics of the parallel-coupled microstrip line were developed by Hammerstad, Kirschning, and Jansen [14] [15] [16]. Following this formulation, and considering L the resonator length, W the width, and S the coupling gap, the quasi static even-and odd-mode characteristic impedance of a coupled line, Z 0e and Z 0o , are, respectively, estimated as per (1) and (2): "
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    ABSTRACT: In this paper, we describe a method to implement compact multiband bandpass filters with suppression of second harmonic frequency. This filter design approach is based on decreasing the coupling gap between adjacent resonators of a parallel-coupled-line bandpass filter in order to achieve both the desired multiband frequency response and the spurious suppression. We present the theoretical analysis of the proposed structure that consists of modeling the frequency dependence of the even- and odd-mode characteristic impedances as well as due to the different phase velocities of the parallel-coupled microstrip lines. As an example, a compact tri-band parallel-coupled-line bandpass filter with suppression of second harmonic frequency was implemented operating at 1.9/3.2/4.6 GHz to cover PCS1900, WiMAX, and C-band applications. A three-pole Chebyshev parallel-coupled microstrip bandpass filter was designed at a center frequency of 3.2 GHz and used as the basis to validate the gapping effect on the filter response which also achieves a narrower bandwidth for the second harmonic. Finally, the filter performance with minimized coupling gap is compared to a filter enhanced by the insertion of apertures in the ground plane. Generally speaking, good agreement was accomplished between simulated, calculated, and measured results.
    Journal of Electromagnetic Waves and Applications 08/2015; 29(14):1813-1828. DOI:10.1080/09205071.2015.1043029 · 1.40 Impact Factor
    • "[10] [11] Designing equations for the coupled line parameters such as space gap between lines and line widths and lengths, can be found in classical microwave books.[12] [13] Closed-form expressions for modeling the frequency dependency of the even-and odd-mode characteristics of the parallel-coupled microstrip line were developed by Hammerstad, Kirschning, and Jansen [14] [15] [16]. Following this formulation, and considering L the resonator length, W the width, and S the coupling gap, the quasi static even-and odd-mode characteristic impedance of a coupled line, Z 0e and Z 0o , are, respectively, estimated as per (1) and (2): "
    [Show abstract] [Hide abstract]
    ABSTRACT: In this paper, we describe a method to implement compact multiband bandpass filters with suppression of second harmonic frequency. This filter design approach is based on decreasing the coupling gap between adjacent resonators of a parallel-coupled-line bandpass filter in order to achieve both the desired multiband frequency response and the spurious suppression. We present the theoretical analysis of the proposed structure that consists of modeling the frequency dependence of the even- and odd-mode characteristic impedances as well as due to the different phase velocities of the parallel-coupled microstrip lines. As an example, a compact tri-band parallel-coupled-line bandpass filter with suppression of second harmonic frequency was implemented operating at 1.9/3.2/4.6 GHz to cover PCS1900, WiMAX, and C-band applications. A three-pole Chebyshev parallel-coupled microstrip bandpass filter was designed at a center frequency of 3.2 GHz and used as the basis to validate the gapping effect on the filter response which also achieves a narrower bandwidth for the second harmonic. Finally, the filter performance with minimized coupling gap is compared to a filter enhanced by the insertion of apertures in the ground plane. Generally speaking, good agreement was accomplished between simulated, calculated, and measured results.
    Journal of Electromagnetic Waves and Applications 08/2015; 29(14):1813-1828. DOI:10.1080/09205071.2015.1043029 · 1.40 Impact Factor
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    ABSTRACT: A technique for modeling the adjacent and nonadjacent couplings between several microstrip lines in microwave integrated circuits (MICs) and monolithic microwave integrated circuits (MMICs) is presented. The technique assumes that the primary transmission paths in the circuit can be modeled with conventional single or coupled microstrip models. A particular four-port model is then superimposed on the existing circuit for each adjacent or nonadjacent coupling that is present. This model uses analytical equations for microstrip coupled lines and is, therefore, fast and easy to compute
    IEEE Transactions on Microwave Theory and Techniques 07/1991; DOI:10.1109/22.81659 · 2.94 Impact Factor
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