Design of Compact Reconfigurable Broadband Band-Stop Filter Based on a Low-Pass Filter Using Half Circle DGS Resonator and Multi-Layer Technique

Abstract

Abstract-This paper describes the design of a two-pole low-pass and band-stop filters. The low-pass structure is designed at the cutoff frequency of 2 GHz for the L-Band applications. This architecture uses half circle defected ground structure HCDGS instead full circle DGS resonator. Both the HCDGS shapes are etched in the ground plane and coupled via a substrate with a compensated capacitor. The rejection bandwidth of the LPF covers a large wideband spectrum. Therefore, the band suppression reaches more than 3f c. The filter is simulated and fabricated. The measured results are in good agreement with the full-wave simulated ones, showing the merits of compact size and sharp roll-off. The multi-layer technique has been used in order to realize a transformation from low-pass behaviours to band-stop characteristics, keeping the same passband features. The new extracted band-stop topology is simulated and optimized using an RO4003 substrate with relative permittivity of 3.38 and thickness of h = 0.813 mm. The structure has a wide stopband with over 20 dB rejection from 3.5 GHz to 8.5 GHz. Such filters can be used for L-band and military applications.

A novel cross-coupled microstrip bandpass filter with hairpin-DGS resonators using coupling matrix technique

“…This section aims at investigating the reliance of the corresponding circuit elements (inductance and capacity) on the substrate known as propagation of electromagnetic fields. The electric field is heavily concentrated in the gap in Figure 2 (a), so any change in the parameters of the gap influences the structure's effective capacitance [17,18]. The calculated magnetic and electrical field densities using HFSS are seen in Figure 2 (b).…”

“…Which can be seen, the magnetic field is focused across the central ground line, so the central ground line determines the inductance. The electric field is distributed across the engraved spaces, reflecting the capacitance [17][18][19]. The slot-head region regulates essentially the inductance [20,21] while the linking shaped slot width "g" regulates the capacitance [22,23].…”

Design and Development of Compact Reconfigurable Tri-Stopband Bandstop Filter Using Hexagonal Metamaterial Cells for Wireless Applications

“…In recent years, the demand for compact microstrip filters is growing due to the newly expanding microwave and mobile communication systems [1][2][3][4]. In order to reduce the complexity and overall volume of such systems, compact and flexible structures like reconfigurable filters are used [5][6][7][8][9][10].…”

Design and Manufacturing of a Novel Compact 2.4 GHZ LPF Using a DGS-DMS Combination and Quasi Octagonal Resonators for Radar and GPS Applications

“…In [18], the performance of microstrip low-pass filter has been investigated by employing a coupled C-shaped defected ground structure. The effect of periodic dumbbell slots in the ground plane has been investigated for achieving sharp transition band in low-pass filter [19][20][21][22][23]. An LPF is designed using double equilateral U-shaped defected ground structure for wide rejection band [24,25].…”