Combination of absorptive notch filter and tunable dual‐band conventional notch filter

Abstract

In this paper, a new kind of absorptive bandstop filter composing three series-coupled lines is designed, investigated, and fabricated. The proposed circuit is indeed a combination of a dual-band conventional notch filter and a singleband absorptive filter generating two conventional and an absorptive notch. More precisely, the circuit introduces a fixed absorptive notch at 4.22 GHz and two electronically tunable (approximately 20%) conventional notches at 1.62-2 and 4.71-5.75 GHz, respectively. Besides, the FBWs of the first conventional notch, the second one, and the absorptive notch are 5.5 AE 1, 3.5 AE 1, and 3 AE 1%, respectively. The instantaneous surface current density of the circuit is depicted to investigate the generation of notches. The circuit has a compact size of 44.7 Â 11.85 mm 2 equaling to 0.489 Â 0.129 λ 2 g ; moreover, it can successfully absorb more than 98% of the input power at its absorptive notch.

A triangular patch array for wireless power transfer

“…In the realm of dual-band WPT, filters have played a crucial role, 6 with various types of bandpass and band-stop filters exhibiting desirable characteristics for WPT applications. 7 Most research has traditionally focused on the sub-1 GHz frequency band. Nonetheless, there are WPT applications and designs operating at 2.4 or 5.8 GHz, commonly within the industrial, scientific, and medical (ISM) band.…”

“…However, the structure could not provide acceptable efficiency at higher frequencies. In the realm of dual‐band WPT, filters have played a crucial role, 6 with various types of bandpass and band‐stop filters exhibiting desirable characteristics for WPT applications 7 . Most research has traditionally focused on the sub‐1 GHz frequency band.…”

Impact of holes in an interdigital parallel folded coupled line‐based wideband bandpass filter for X‐band applications

“…A microwave filter is a frequency‐selective network that typically operates between 300 MHz and 300 GHz, allowing signals to flow through in the passband while severely dampening them in the stopband. In response to the growing need for small, high‐quality communication systems, a plethora of microwave filter design methods have emerged 1–3 …”

“…In response to the growing need for small, highquality communication systems, a plethora of microwave filter design methods have emerged. [1][2][3] In Lahiri and Harikrishna, 4 microstrip technology is described as a viable alternative to waveguides, suspended strip lines, strip lines, and so forth. designs for implementing microwave BPFs due to its tunability, small size, and low cost.…”