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This study presents a highly customisable bandpass filter based on standard printed circuit board (PCB) material and process. Such a filter utilises cascaded bandstop‐bandpass‐bandstop (BS‐BP‐BS) topology. There is one substrate integrated waveguide (SIW) coax resonator in each bandstop section, whereas there are three SIW coax resonators in the ba...
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A novel planar elliptic function lowpass filter (LPF) based on substrate integrated suspended line technology is developed and investigated. Transformed radial stub, stepped‐impedance resonators, and open stubs are cascaded to obtain sharp roll‐off and wide stopband. The proposed LPF produces six transmission zeros in the stopband, and the mechanis...
Citations
... It may be categorized as mechanical and electronic tuning. Metallic screws, flaps, posts, the insertion of a dielectric rod, etc. [20][21][22] can be used to tune the filter mechanically while PIN diodes, varactor diodes, MEMS switches, etc. [24][25][26][27][28][29] can be used for electronic tuning. For the design and implementation of electronically reconfigurable filters, sophisticated DC bias circuits are required, which increases their size, complexity, and power consumption. ...
... Firstly, it is possible to combine multiple single-band filters into a multiband filter (Chen, 2021;Yang et al., 2018). These single-band filters can either be cascaded (Sirci et al., 2019;Hung et al., 2020), embedded into each other (Zobeyri and Eskandari, 2018), or implemented by combining two sets of resonators with common input and output (Ren et al., 2018;Zhang et al., 2019). However, these methods appear consuming in terms of size and complexity of the filter as it would be required to have a filter whose size is equal to the size of two filters. ...
This paper includes two new microstrip filter configurations for high frequency and Ultra-Wide Band applications. The first proposed filter is a composition of four parallel open-circuited stubs connected by optimized fractal-structured microstrip line. The filter response is a combination of three passing regions, namely low pass from 0.1 GHz to 3 GHz, band-pass from 4.5 GHz to 9 GHz and high pass from 10.5 GHz to 13 GHz, separated by two rejection regions from 3 GHz to 4.5 GHz and 9 GHz to 10.5 GHz. Deep and sharp rejection regions reaching up to -44.6 dB with 40 % fractional bandwidth (FBW) are observed with a good electrical performance. Furthermore, with a comparative table, the advantages of this proposed BSF in terms of FBW, compactness and insertion loss are compared with recently reported related studies. Secondly a dual-band band pass filter implementing a Stepped-Impedance resonator (SIR) and a modified H-shaped structure is presented. This filter is designed to operate in a low pass region up to 3.58 GHz and a band pass region from 15.38 to 21.65 GHz, with a wide stopband region between 4.46 and 14.07 GHz. The simulated and measured results are in good agreement. Compared to its peers, the compact size and low price allow for a wide application of these filter configurations, while passing frequencies allow operation in the unlicensed frequency spectrum, which is popular for high-speed communication. Keywords: Microstrip Filter, Band Pass, Band Stop, Open Stubs, SIR.
