高选择性陷波超宽带天线设计

Design of highly selective band-notched ultra-wideband antenna

研究了交指电容环和其对偶结构即互补交指电容环的谐振特性.与一般的谐振结构相比,交指电容环具有较大的等效电容,而互补交指电容环具有较大的等效电感,因此,这两种谐振环能够产生更低的谐振频率和更窄的谐振带宽.将这两种谐振环用于陷波设计,提出了一款具有四陷波特性的小型化超宽带天线.测试结果表明,该天线工作带宽覆盖范围为3~11GHz（电压驻波比小于2）,在3.5、5.2、5.8和7.5GHz处形成了4个尖锐的陷波,避免滤除有用频段造成频谱的浪费.此外,交指电容环与互补交指电容环的加载并不影响工作频段内天线的性能.

The resonant properties of the interdigital capacitance loading loop resonator（IDCLLR）and its dual counterpart complimentary interdigital capacitance loading loop resonator（CIDCLLR）are studied.Due to the high capacitance/inductance of the IDCLLR/CIDCLLR,the resonators can generate lower resonant frequencies and narrower resonant bandwidths than many other structures.A compact ultra-wideband（UWB）antenna with quadruple sharp band-notching characteristics is presented by utilizing IDCLLRs and CIDCLLRs.Measured results show that the proposed antenna has a wide bandwidth from 3 to 11GHz（VSWR2）,with four sharp notched bands centered on 3.5,5.2,5.8 and 7.5GHz,respectively,avoiding the elimination of many useful frequencies.Moreover,the presence of IDCLLRs and CIDCLLRs scarcely affects the performance of the UWB antenna at its operating frequencies.