In this paper, a compact triple-narrowband bandpass filter is designed and proposed using microstrip resonators . The proposed triple-band BPF consists of two half-wave resonators in combination with a simple anti-parallel coupled lines which realizes a triple-band BPF with a size reduction about 42% in comparison with the conventional one. Additionally, transmission zeroes of the proposed structure guarantee the sharpness the skirts of scattering parameters of triple-band BPF. The frequency response of the filter is simulated using an EM simulation tool.
This paper introduces a compact dual-band slot antenna using spiral inductive loaded resonators. The radiating elements of the proposed antenna are composed of two balanced short circuited slot lines. To design a dual-band antenna, the microstrip feed line is somehow implemented to provide three short circuit points between the antenna and the feed lines. The antenna size is very compact, and can be integrated easily with other RF front-end circuits for dual-band applications. It is demonstrated that the proposed antenna can provide dual-band behavior with satisfactory radiation characteristics.
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