An Electronically Tunable Dual-Band Filtering Power Divider With Tuning Diodes Sharing Technique

Abstract

Abstract-This paper presents an electronically tunable dual-band filtering power divider (TDFPD) with tuning diodes sharing technique. Two dual-mode tunable resonators (DMTRs) are embedded into a conventional power divider to achieve dual-band tunable bandpass filtering response. The two bands of the proposed TDFPD can be tuned independently. Tuning diodes sharing technique is utilized to reduce the number of tunable diodes. A prototype has been designed and fabricated to validate the proposed design as shown by the good agreement between the measured and simulated results. The measurement shows that the center frequencies of the lower and upper bands can be independently tuned from 1.31 to 1.62 GHz and 2.92 to 3.30 GHz, respectively. Within the passbands, isolation between the two output ports is higher than 16 dB with small phase and magnitude imbalance.

A Novel Tunable Lc Bandpass Filter With Constant Bandwidth Based on Magnetic Dominant Mixed Coupling

“…Tunable RF filters have the characteristics of tunable performance such as center frequency and bandwidth, which can flexibly meet different indicators, realize different frequency selections, and greatly promote the integration of wireless communication equipment miniaturization and control simplification [1,2]. For achieving a constant bandwidth response during frequency tuning, microstrip tunable filters with varactor diodes have been reported [3][4][5][6][7][8][9]. At present, there are mainly two types of bandwidth compensation method.…”