Design and fabrication of a miniaturized lowpass-bandpass diplexer with wide tuning range and high isolation

被引:14
作者
Rayatzadeh, Sadegh [1 ]
Moloudian, Gholamhosein [2 ,3 ]
机构
[1] Islamic Azad Univ, Dept Elect Engn, Behbahan Branch, Behbahan, Iran
[2] Salman Farsi Univ, Dept Elect Engn, Kazerun, Iran
[3] Islamic Azad Univ, Dept Elect Engn, Arak Branch, Arak, Iran
关键词
Lowpass filter (LPF); bandpass filter (BPF); diplexer; tunable; isolation; LOW-PASS FILTER; SHARP ROLL-OFF; COMPACT; IMPEDANCE; STOPBAND;
D O I
10.1080/09205071.2019.1649604
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
In this article, a compact lowpass-bandpass (LP-BP) diplexer with high isolation for wireless telecommunication applications is presented. The -3 dB cut-off frequency of the lowpass filter (LPF) is equal to 1 GHz. The roll-off-rate (ROF or zeta) parameter is sharp and equal to 108.8 dB/GHz, and the rejection level in the stopband is 20 dB. The center frequency of bandpass filter (BPF) is 2.4 GHz. The tuning range of -3 dB cut-off frequency of the LPF is wide and ranges from 0.3 to 0.89 GHz. The tuning range of center frequency of the BPF is wide and ranges from 2.65 to 3.1 GHz. The obtained isolation between the two output ports is better than 30 dB. The proposed tunable LP-BP diplexer is designed, simulated, fabricated and measured. The results of measurement and simulation are in good agreement with each other. The proposed diplexer has a compact size of 64 x 38 mm(2).
引用
收藏
页码:1874 / 1889
页数:16
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