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Both the magnetic toroidal dipolar (MTD) response and electric toroidal dipolar (ETD) response have been achieved and studied in the microwave region by designing a feasible planar metamaterial. By changing the polarized direction of a normally incident wave, two different coupling modes are observed, and therefore MTD and ETD responses can be achieved accordingly. It is also confirmed by scattered powers for various multipole moments and field distributions that they dominate over other traditional multipole responses at 5.69 GHz and 11.69 GHz, respectively. In view of the design feasibility of planar metamaterial, these resonance-enhanced MTD and ETD responses could provide an avenue for various interesting phenomena associated with the elusive toroidal moments.

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Low-dielectric-constant polymer materials are widely used in the electronic industry owing to their unique characteristics. Benzocyclobutene (BCB) resin is one such material with excellent dielectric properties and thermal stabilities. In this work, a novel BCB-functionalized monomer (DCPDNO-BCB) was synthesized from 2,6-dimethyl phenol-DCPD novolac (DCPDNO) and 4-Bromobenzocyclobutene through Ullmann coupling. The structure of DCPDNO-BCB was characterized by 1 H NMR, 13 C NMR, and ESI-MS, and poly(DCPDNO-BCB), obtained by ringopening and subsequent Diels-Alder reaction at the appropriate temperature, was found to exhibit low dielectric properties (k = 2.53 at 10 MHz), low water absorption, high thermal stability (T d5 = 430 C), and good film flatness.