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A pair of coupled stepped-impedance resonators and its use to build single- and dual-band bandpass filter (BPF) is presented. To that end, two symmetrical stepped-impedance resonators with two embedded coupled-line sections are used. The adopted resonators are coupled at the two open-ended edges. The first even-mode resonant mode can be suppressed or excited based on whether it is required to realize...
A directional coupler using stepped-impedance broadside coupled structure is presented. The design is targeted to have 3-dB coupling with more than 30 dB directivity across a two-octave band (more than 110% fractional bandwidth). The second-order even- and odd-mode analysis method is adopted to design the device and calculate its performance. Moreover, a prototype is modelled in a simulation tool...
A compact ultra-wideband in-phase power divider with planar structure is presented. The proposed device utilizes three-line parallel-coupled microstrip lines. To realize the required tight coupling for an ultra-wideband performance, a slotted ground is utilized underneath the coupled lines. Moreover, chip capacitors are connected between the central line and each of the side coupled lines. Both of...
An ultra-wideband (UWB) bandpass filter is proposed in this paper. The proposed structure composes of two pairs of microstrip short-circuited stubs which provide a microstrip-to-CPW transition, and a CPW resonator whose length is about half-guided-wavelength (λg/2) at 6.85GHz. A triple-mode UWB bandpass filter is produced using this microstrip-to-CPW transition structure. In order to suppress WLAN...
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