Design and fabrication of a novel multilayer bandpass filter with high‐order harmonics suppression using parallel coupled microstrip filter

Abstract

This study presents a novel multilayer structure of parallel coupled‐line bandpass filtercentered at 2.42 GHz with a fractional bandwidth value of approximately 19.4%. The designed filter can suppress harmonics with an appropriate frequency response by incorporating different techniques based on the multilayer technique. A combination of different techniques such as radial microstrip stubs and defected ground structure (DGS) and defected microstrip structure techniques are employed to suppress harmonics up to 5f0. These techniques are used in two layers to suppress up to 5f0. In addition, in this study, the effects of different parameters, such as the width of slot‐line DGS, the angle of diagonal line slots in the upper layer, and the air gap between the two layers on the filter performance, are investigated. To verify the correct circuit operation, the designed filter is implemented and tested. The measurement results of the proposed filter are compared with the simulation results.

Compact Parallel Coupled Line Microstrip BPF Design for 5G Applications

“…The general structure of parallel coupled line microstrip BPF is depicted in Figure 5. In this case, the coupled-line structure is composed of two quasi-Transverse Electric and Magnetic (TEM) modes: even and odd [21]. For an even-mode incitement, both microstrip lines have the same voltage potentials.…”

Dipole Antenna With Horn Waveguide for Energy Harvesting in DTV Systems

“…The matching impedance circuit uses a Radial Stub Circuit (RSC) [36,37], as shown in Figure 12, to maximize the signal source's energy transfer by design at a center frequency of 650 MHz which has a half power beamwidth R = 3 cm, θ = 60 • . The input impedance of the electric load, then the half-power beam was adjusted to a width of R = 3 cm with a value of θ = 60 • , then it started to be adjusted from (60 • < θ < 166 • ), namely 60 • , 103 • , and 166 • , and it was found that the optimum half-power beam was R = 2.6 cm and had θ = 103 • .…”

“…As a result, the researchers choose disadvantages identified by this research that is the first part of a basic dipole antenna structure [27,28] with an increasing I-shaped stub to widen the frequency [16,[29][30][31][32] and gain enhancement for the antenna by using the horn waveguide [33][34][35] and in terms of getting more energy. The second part studies the matching impedance circuit using a Radial Stub Circuit (RSC) [20,36,37] with the power frequency signal converter circuit by using a full-wave rectifier circuit with a voltage multiplier circuit [16,38,39] to increase the pressure on the rectenna system that is designed to receive power at a frequency of 510-790 MHz, which is the digital TV wireless transmission system. At present, it is widely used in Thailand [40].…”

Data‐driven modeling of band‐pass filter for sub‐5G applications

“…Microstrip planar circuits are one of the most commonly used design solutions for RF passive and active elements because they can be easily integrated in the current communication systems, have small physical size, low weight, and low cost 4 . Although there are a series of applications of microstrip band‐pass filter designs in literature for different operations bands of Wifi, 5 ISM, 6 WiMAX, 7 5G, multiband, 8 or ultra‐wideband, 9 in all of the mentioned applications, the proposed design can only be achieved via an accurate and elaborate calculations, also using 3D full‐wave EM simulators. However, such techniques are not only tedious but are also computationally inefficient 10–12 …”

“…microstrip band-pass filter designs in literature for different operations bands of Wifi, 5 ISM, 6 WiMAX, 7 5G, multiband, 8 or ultra-wideband, 9 in all of the mentioned applications, the proposed design can only be achieved via an accurate and elaborate calculations, also using 3D fullwave EM simulators. However, such techniques are not only tedious but are also computationally inefficient.…”