ارائه یک فیلتر باند وسیع مایکروویو کوچک با استفاده از حلقه مستطیلی بارگذاری شده با بازوی زمین شده و حلقه های رزونانسی شکاف دار
2015
A compact and sharp-rejection ultra-wideband (UWB) microstrip bandpass filter (BPF) is
presented. The proposed filter is constructed with multiple-mode resonator (MMR) and split
ring resonator (SRR). Moreover, proposed structure consists of two doublets parallel coupling
gaps at each side of a microstrip ring. In comparison with some other filters, this structure
shows a significantly wider passband due to the introduction of a cross-coupling between
the feed lines (input and output) which generate four pairs of attenuation zeros in the
passband. In order to control the transmission zeros in the pass band and adjust the transmission
zeros near the lower edges of the filter, a Short Stub, Loaded on microstrip Rectangular
Ring Has Been Used. Also, In order to sharpen the upper edge of the filter, we used SRRs in
both side of the doublets parallel coupling gaps that leads to the addition of one extra transmission
poles at the upper edge of the filter. Consequently, a compact four-zero and one pole
ultra-wide bandpass filter is designed which exhibits extremely sharp rejection skirts around
the target passband. The proposed filter has a passband covers 2.8 to 10 GHz and its measured
3 dB fractional bandwidth is about 112.5%. Furthermore, rejection level better than 20
dB in upper stopband is extended to around 18 GHz. To our knowledge, the size of proposed
ultra-wideband filter is more compact in comparison with known similar filters.
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