An efficient and compact dual bandpass filter having single narrow rejection band between S-band and C-band using CPW arrangement is proposed. The half wavelength square resonator is used in ground surface to eliminate certain frequency bands. The transmission zero of rejection band is restricted by modifying the dimension of the resonator. The CPW-based DB-BPF is simulated and tested with its equivalent prototype. This work emphasizes DB-BPF with square resonator coupling constructed on CPW process. An innovative integration of circular resonator incorporated with inter-digital line coupling in the top surface of the substrate and square resonator at the bottom surface of the substrate produces wide band and narrow stop band, respectively. The DB-BPF has remarkable bandwidth from 2 to 3.8 GHz and 4.3 to 7.8 GHz as S-band and C-band, respectively. Hence, the overall bandwidth of the filter is 5.3 GHz (1.8 GHz and 3.5 GHz). The filter performances are evaluated and analyzed through the factors like S-parameters, Q -factor and group delay. The overall dimension of DB-BPF is achieved to be (39 × 4.5 × 1.6) mm 3 , which is very much compact in dimension. The filter characteristics show the return loss of − 35.2 dB and insertion loss of − 1.2 dB which are validated by measured results.

中文翻译：

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用于卫星 S 波段和 C 波段的紧凑型导体支持的基于 CPW 的双带通滤波器

提出了一种高效且紧凑的双带通滤波器，该滤波器在 S 波段和 C 波段之间使用 CPW 布置具有单个窄带通滤波器。半波长方形谐振器用于地表以消除某些频带。通过修改谐振腔的尺寸来限制阻带的传输零点。使用等效原型对基于 CPW 的 DB-BPF 进行模拟和测试。这项工作强调了基于 CPW 工艺构建的具有方形谐振器耦合的 DB-BPF。圆形谐振器与基板顶面的叉指线耦合和基板底面的方形谐振器的创新集成分别产生宽带和窄阻带。DB-BPF 分别在 2 至 3.8 GHz 和 4.3 至 7.8 GHz 的 S 波段和 C 波段具有显着的带宽。因此，滤波器的总带宽为 5.3 GHz（1.8 GHz 和 3.5 GHz）。通过 S 参数、Q 因子和群延迟等因素对滤波器性能进行评估和分析。DB-BPF 的整体尺寸达到 (39 × 4.5 × 1.6) mm 3 ，尺寸非常紧凑。滤波器特性显示 - 35.2 dB 的回波损耗和 - 1.2 dB 的插入损耗，经测量结果验证。