In high-frequency devices, controlling the effects of circuits on each other is especially important in compact space. In this regard, a diplexer consists of a lowpass (LP) filter and a bandpass (BP) filter has been designed, fabricated, and measured, which has appropriate responses in compact size. The BP filter is designed based on the new equivalent circuit model, which is analyzed using even–odd mode. The LP filter consists of a single-resonator suppressor and the main resonator. The effects of the filters on each other are investigated by the transmission zeros (TZs) in the output response of each filter. The measured results of the designed BP filter have a bandwidth of 0.2 GHz with a center frequency of 2.42 GHz, the lower stopband bandwidth of 2 GHz and upper stopband bandwidth of 4.68 GHz. The proposed LP filter has a wide stopband bandwidth of 7.35 GHz, from 1.75 to 9.1 GHz with a suppression level of 20 dB. The 3 dB cut-off frequency is located at 1.46 GHz with a transition band of 0.29 GHz. Finally, the proposed diplexer was fabricated and measured, and a good adaptation between simulation results and fabrication ones was observed.

在高频器件中，控制电路对彼此的影响在紧凑空间中尤为重要。在这方面，已经设计、制造和测量了由低通 (LP) 滤波器和带通 (BP) 滤波器组成的双工器，其在紧凑的尺寸中具有适当的响应。BP滤波器是基于新的等效电路模型设计的，采用奇偶模式进行分析。LP 滤波器由单谐振器抑制器和主谐振器组成。通过每个滤波器输​​出响应中的传输零点 (TZ) 来研究滤波器对彼此的影响。所设计的BP滤波器的测量结果具有0.2 GHz的带宽，中心频率为2.42 GHz，下阻带带宽为2 GHz，上阻带带宽为4.68 GHz。建议的 LP 滤波器具有 7.35 GHz 的宽阻带带宽，从 1.75 到 9.1 GHz，抑制电平为 20 dB。3 dB 截止频率位于 1.46 GHz，过渡带为 0.29 GHz。最后，制造并测量了所提出的双工器，并观察到仿真结果与制造结果之间的良好适应性。