Miniaturized coplanar waveguide stop band filters based on multiple tuned split ring resonators

Compact CPW Metamaterial Resonators for High Performance Filters

“…A standard mask/photoetching technique is used to fabricate the structures using an FR-4 substrate (dielectric constant  r = 4, loss tangent tan= 0.02, thickness h = 0.5 mm). With a single pair of CSRRs we obtain a considerably higher suppression than reported in (Martin et al, 2003a). Fig.…”

“…Here, the SRRs are placed on the bottom side of the dielectric layer as shown in Fig. 8a (Martin et al, 2003a). In this case, the CPW can be designed to have almost the same impedance as if no SRRs were present.…”

“…The origin of this dip and countermeasures to remove it are discussed in the following section. Another remarkable aspect about the CSRR is the high rejection level in the forbidden band of nearly 30 dB, which is at least twice as high as the suppression of the SRR-based structures introduced in (Martin et al, 2003a). Thus, CSRRs provide an effective way to eliminate frequency parasitics in CPW structures.…”

A compact and low-loss band-pass waveguide resonator using higher order resonance of CSRR

“…In [2] and [3], SRR's behavior is modeled by a LC resonant circuit, where an analytical equation for equivalent inductance and capacitance is extracted as well. The resonance properties of the SRRs are very attractive for the design of compact microwave filters [4,5,6]. In [6], the concept of using complementary split ring resonators (CSRRs) for designing band-pass waveguide filters was discussed.…”

Controlling Gigahertz and Terahertz Surface Electromagnetic Waves with Metamaterial Resonators

“…There have been some works utilizing the so-called split-ring resonator (SRR) [14], to couple with the magnetic component of light within a waveguide, or the complementary split-ring resonator (CSRR) [15][16][17][18][19][20][21], for electric coupling on a coplanarwaveguide (CPW) structure. In these systems, metamaterials serve as parasitic elements producing stopbands [15,16] or passbands [14,17]. Other works have demonstrated metamaterials (MMs) capable of more sophisticated responses, such as nonreciprocity [18] and dynamic tunability [22][23][24].…”