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In this paper, an incident angle insensitive and polarization stable band-pass frequency selective surface (FSS) with flat top is proposed. Each element of the FSS consists of four metallic layers separated from one another by three dielectric layers. The first and the fourth layer are the same hexagonal loop layers, while the middle two layer are hexagonal convoluted slot layers. This FSS exhibits...
A novel compact quad-band bandpass filter (BPF) with multi-transmission zeros is proposed. This filter utilises a sextuple-mode impedance resonator to achieve three passbands, and the fourth passband composes of single-end short-circuited resonators. Adopting an embedded and folded structure is employed to realise miniaturisation. Stub-stub coupling is introduced to produce transmission zeros, which...
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