Abstract
Here, the authors present a new type of split-ring resonator (SRR) constructed from high dielectric constant material. Compared to conventional metal SRRs, such resonators have significantly higher unloaded quality factor ( Q u ). A new class of microwave filter is presented using the dielectric SRR. Two examples of different filter configurations are investigated, and the measured results show excellent performance. Good agreement between measurements and simulations has been achieved.
Highlights
Filters formed of resonators with high unloaded quality factor (Qu) are in demand for applications with stringent requirements on insertion loss, this includes satellite systems and wireless base stations [1–4] as well as many others
The electromagnetic field distributions and filter configuration for this dielectric combline is approximately the same as the conventional metal combline resonator, provided the dielectric constant is high [9–12]. Another type of resonator is the metal split-ring resonator (SRR) with Qu of ∼4000 at S band manufactured with copper material [13–15]
This paper looks at filters where the dielectric-SSRs are all in the same plane, alternatives have been investigated for metal-SRRs where they are placed on the top of each other in a cylindrical housing [13, 14]
Summary
Filters formed of resonators with high unloaded quality factor (Qu) are in demand for applications with stringent requirements on insertion loss, this includes satellite systems and wireless base stations [1–4] as well as many others. The electromagnetic field distributions and filter configuration for this dielectric combline is approximately the same as the conventional metal combline resonator, provided the dielectric constant is high [9–12]. Another type of resonator is the metal split-ring resonator (SRR) with Qu of ∼4000 at S band manufactured with copper material [13–15]. The higher Qu is due to the removal of the conduction current on the surface of the metal-SSR where most of the losses conventionally occur As these ohmic losses are removed, the main contribution to the loss in the dielectric-SRR is loss tangent of the dielectric material forming the resonator [9, 22]. Full-wave analysis software (CST [23]) and the methodology of coupled resonator circuits [24] have been used to design new class of filter with examples of two high Qu filters based on the novel dielectric-SRRs
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