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This paper proposes two new multi-section dumbbell-shaped defected ground plane structures (DGS). The defects are created in the ground plane of the conventional single-layer microstrip transmission line. The proposed DGSpsilas application in microwave filtering is investigated. It turns out that these new DGSpsilas can be used to realize notch filters (i.e. narrow-band band-stop filters) with steep...
This paper presents a new design method of compact five poles low pass filter using defected ground structure (DGS). The proposed low pass filter (LPF) is designed for 2.5 GHz cut off frequency having better than -25 dB rejections up to 3.36 fc. It does not have any, discontinuity elements and the repeated high low impedance lines, which are essential for the design of conventional LPF. Only DGS patterns...
This paper describes the design and development of band pass filter (BPF) at 140 GHz. Two different design techniques are used to realize the filter. First design uses capacitively coupled series resonators in suspended stripline configuration and second one uses metal insert filter (MIF) technique in waveguide configuration. Both the designs are modeled and optimized using CST (Computer Simulation...
Miniaturized stepped impedance lowpass filters employing defected ground substrates (DGS) are proposed for IEEE 802.16a applications. The DGS slots are applied to the high impedance sections of the lowpass filter increasing the effective inductance of the circuit. A suitable combination of DGS slot, high impedance line and step discontinuity bring about an increase in the series inductance and result...
Tri-band BSF working at C, Ku and K band has been developed using a single topology. The designed 3-in-1 filter posses compactness, wider bandwidth, and low insertion loss. The proposed topology is constructed using spurline filter at the output connected with a section of anti-coupled lines. The filter with the presented approach can be used to shift the frequency at the desired location by optimizing...
This paper describes the design, development and performance of coaxial cavity band pass filters for transmit and receive chains of Standard-C terminal of International Maritime Satellite (INMARSAT) system.The band pass filters are at centre frequencies 1537.5 & 1636 MHz with bandwidths of 15 & 20 MHz with respect to centre.The sharp cut off has been achieved at 1626 & 1545 MHz for receive...
Parallel coupled microstrip filters are extensively used as band pass filter in microwave communication because they are compact in size, easy to fabricate due to its planar structure. The responses of these filters are satisfactory for narrow bandwidth due to their relatively weak coupling. A severe limitation of the conventionally designed parallel coupled filters is parasitic response at harmonics...
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