An Ultra-Wideband Balanced Bandpass Filter Based on Defected Ground Structures

Abstract

An ultra-wideband (UWB) balanced bandpass filter (BPF) is proposed and designed using defected ground structures (DGSs). A multimode resonator on top layer with a coplanar waveguide on bottom layer is used to design a UWB BPF. U-shaped and H-shaped DGSs loaded with capacitor are used to design to provide common mode rejection within a lower band, while a set of dumbbell-shaped DGSs are utilized to provide common mode rejection within an upper-band. The proposed UWB balanced BPF shows the performance of good common mode rejection in and out of the UWB passband.

Design of a Compact UWB Bandpass Filter using Via-Less CRLH TL

“…A single CRLH TL cell based UWB band pass filter [5] operating over the frequency band of 4 GHz to 9. [8][9][10][11][12][13] report the various UWB BPFs based on different techniques such as a CRLH TL and fractal geometry based UWB BPF [8], the coupled structure based ultra wideband bandpass filter [9], defected ground structure [10], modified CRLH TL with cross coupling [11], cascading bandpass and bandstop filters [12] and multi mode resonator based UWB BPF [13]. The UWB BPFs [8][9][10][11][12][13] designed using different techniques are considered in this paper for comparison of various parameters with the proposed UWB BPF.…”

Highly compact UWB bandpass filter based on composite right/left-handed transmission line and meander fractal like ring slot in ground

“…The UWB BPFs presented in [11–13] were designed based on the transmission line approach of left-handed (LH) metamaterials, where shunt stubs need to be connected to the ground plane through vias, which increases the fabrication complexity and also lead to expensive backside processing. Some more UWB BPFs [14–16] are considered in this paper for the comparison purpose with the proposed UWB BPF. In [14–15], broadside coupled microstrip-slot-microstrip structures are utilized to obtain UWB response.…”

“…In [14–15], broadside coupled microstrip-slot-microstrip structures are utilized to obtain UWB response. In [16], the UWB performance was achieved with a pair of symmetrical UWB filtering units based on differential transmission lines and three DGS units in the ground plane. However, the designed UWB filters in [14–16] are large in size and complex to implement.…”

Compact Differential Bandpass Filter With Improved in-Band Common-Mode Suppression With Loaded T-Shaped Resonators

“…Novel UWB differential filters based on 180 • phase shifter were fabricated in [21,22], where πnetwork microstrip line structure was employed in [21] and doublesided parallel-strip line was used in [22]. To improve the performances of CM suppression, defected ground structures (DGS) were proposed in [23] and [24] for balanced BPFs implementations. However, the drawback was that the size was big and it would consume the available area in the ground plane.…”