Compact ultrawideband bandpass filter with triple notched‐bands and sharp transmission zeros based on CSRR, DGS, AND FMRR configurations

Abstract

In this article, the performance of FBG-assisted ICI reduction is compared with that of SG with different OFDM symbol rise times and in presence of CD. Increase in symbol rise times requires the reduced intervals of a SG but the length of FBG remains same. The rise time of 5 ps and presence of delay due to CD, the BER performance of FBG is better than that of SG, especially for transmission distance above 30 km. In the case of middle subcarriers, FBG gives BER < 10 23 for 45 km. In the AO-OFDM system with FBG based passive device, synchronization between the ICIfree region and sampling instant is not needed, which omitting complex tuning circuits and reducing the system cost, and CP is not required due to tolerance to CD increases. 2. N. Cvijetic, OFDM for next generation optical access networks, J Lightwave Technol 30 (2012), 384-398. 3. D. Hillerkuss, et al., 26 Tbit s-1 line-rate super-channel transmission utilizing all-optical fast Fourier transform processing, Nat Photon 5 (2011), 364-371.

an ultra‐wideband bandpass filter with high return loss and controllable notch band

“…The high return loss and the harmonic suppression characteristics of the proposed UWB bandpass filter can improve the overall system performance and stability. Since the last decades, the development of global positioning system (GPS) in commercial applications, such as localization through mobile devices and phones, vehicle navigation systems, and industrial scale asset tracking, has attracted much incentives for designing compact GPS antennas with high performance and small size [1][2][3][4][5][6][7][8]. Because of the operating frequency at 1575 MHz for GPS module, the antenna size is the limiting factor.…”

“…In military communication systems this drawback is solved by employing GPS arrays to produce nulls in the directions of the jamming signals. In recent years, various antennas with different techniques, such as folding and meandering, have been proposed for GPS systems drawbacks [8,9]. Using (LTCC) technology for easy integration and flexible via distribution anywhere in the substrate, has emerged as a novel method for designing compact and lightweight antennas.…”

“…However, an interference with other narrow band communication systems may occur, such as with world interoperability for mobile access (WiMAX, 3.5 GHz) and a wireless localarea network (WLAN) bands (5.2 and 5.8 GHz). Therefore, UWB bandpass filter (BPF) without and with single-and multiplenotched bands was recently investigated to suppress the interference band [1][2][3][4][5][6][7][8][9]. The multi-mode resonator (MMR) with input/ output coupling and stub-loaded MMR were proposed in Refs.…”

“…Similarly, a triple-and quad-notched bands UWB BPF using interdigital coupled with multiple-mode resonator and broadside-coupled microstip/coplanar waveguide was introduced in Refs. [8] and [9], respectively. The previous UWB BPF works were focused on harmonics suppression, notch bands, and the circuit size.…”

Automated design for a hybrid lumped and distributed dual‐band stub using aggressive space mapping

“…In fact, our design concept originates from the classical CSRR based ATL (CATL). The CATL features a simple structure, but it possesses extraordinary CRLH transmission performance, leaving many researchers conducting comprehensive researches on its property characterization and engineering application . Some reported works also focused on the automatic synthesis of the CATL using ASM .…”