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Design of Low-Pass Filters Using Defected Ground Structure

Design of Low-Pass Filters Using Defected Ground Structure,10.1109/TMTT.2005.852765,IEEE Transactions on Microwave Theory and Techniques,Jong-Sik Lim,

Design of Low-Pass Filters Using Defected Ground Structure   (Citations: 56)
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A method to design low-pass filters (LPF) having a defected ground structure (DGS) and broadened transmission-line elements is proposed. The previously presented technique for obtaining a three-stage LPF using DGS by Lim is generalized to propose a method that can be applied in design$N$-pole LPFs for$ Nleq5$. As an example, a five-pole LPF having a DGS is designed and measured. Accurate curve-fitting results and the successive design process to determine the required size of the DGS corresponding to the LPF prototype elements are described. The proposed LPF having a DGS, called a DGS-LPF, includes transmission-line elements with very low impedance instead of open stubs in realizing the required shunt capacitance. Therefore, open stubs, tee- or cross-junction elements, and high-impedance line sections are not required for the proposed LPF, while they all have been essential in conventional LPFs. Due to the widely broadened transmission-line elements, the size of the DGS-LPF is compact.
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    • ...It is known that the pattern ground structure helps the size reduction of the microstrip line and spurious passband suppression due to its slow-wave and band-gap effects, respectively [8], [9]...

    Li Yanget al. Miniaturized Parallel Coupled-Line Filter-Antenna With Spurious Respon...

    • ...Transmission lines with defected ground are also used in microwave circuits such as filters, couplers, antennas and matching circuits [1-13]...

    D. Packiarajet al. Dual band(WLAN & WiMAX) suppressed harmonic microstrip filter with per...

    • ...Since then, they have been used in many applications like lowpass filters [8], bandpass filters [6], [9], [10], antennas [7], waveguides [3] and others...
    • ...In addition, most of the work that has been published so far has considered the structures by means of parallel RLC equivalent circuit to represent the transmission zeros in the response [8], [11], providing no insight into the underlying electromagnetic wave propagation principle and hence providing no design rules...

    Heba B. El-Shaarawyet al. Novel Reconfigurable Defected Ground Structure Resonator on Coplanar W...

    • ...In practice, low pass filter designs have many approaches: applying open stubs [1-2], using stepped impedance structure [3-5], photonic bandgap structure [6], defected ground [7-9] and hairpin[IO-12] to gain the compact size, high performance and easy fabrication...

    Jan-Dong Tsenget al. A novel coupled-line low pass filter design

    • ...The advantages of the DGS described by the previous researchers are: (a) it is easy to extract the equivalent circuit model, (b) it is easily applied to RF/microwave circuits to reduce size or improve performances, and (c) a high impedance transmission line can be obtained by using the DGS structure [4]-[6]...
    • ...The DMS can be modeled as like DGS by a parallel LC circuit connected in series with a transmission line [4], [7]-[8]...
    • ...The elements values of L and C of equivalent circuit of the DMS and the DGS are calculated from Electromagnetic (EM) simulation using the following equation [4], [7]-[8]...

    Girdhari Chaudharyet al. DMS harmonic termination load network for high efficiency power amplif...

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