Abstract
In this study, a novel circuit model was proposed for the design of multifunction integrated diplexers with frequency division, frequency selection, and power division functions. The proposed highly integrated multifunctional diplexer mainly comprises only two different-frequency multimode resonators and two isolation resistors, which results in a compact circuit size. The distributed coupling technique was adopted to integrate the two multimode resonators. One resonator was used to form a channel passband, and the other resonator was used to form another channel passband. Moreover, each channel passband can be independently designed and flexibly allocated. The two resistors loaded between the output feeding lines were introduced to improve the impedance matching of the output ports and the isolation between the output ports for each channel. The coupling structures, theoretical analysis, and design procedure for the proposed multifunction integrated diplexers are described. For demonstration, multifunction integrated diplexers with second-order and third-order filtering responses were designed and fabricated using microstrip technology. The experiment and simulation results were consistent and indicated satisfactory in-band and out-of-band performance.
Highlights
In latest RF and microwave multiband wireless communication systems, multifunctional devices play a crucial role
The filtering power divider (PD) in [1]–[6] have been designed based on the coupled resonator technology, in which the coupling between resonators is a substitute for the quarter-wavelength (λ/4) line of a traditional Wilkinson PD, which provides the PD with a frequency selection function
DESIGN OF THE SECOND-ORDER MULTIFUNCTION INTEGRATED DIPLEXER Fig. 2 illustrates the coupling structure of the proposed second-order multifunction integrated diplexer, which consists of two dual-mode resonators and two isolation resistors (R1 and R2), where S and L denote the input and output ports, respectively
Summary
In latest RF and microwave multiband wireless communication systems, multifunctional devices play a crucial role. To improve system integration, reducing the system size and economic cost and developing multifunctional devices are urgently needed. Integrating a bandpass filter (BPF) and power divider (PD) into a single device, namely a filtering PD, is a popular research subject [1]–[27]. The filtering PDs in [1]–[6] have been designed based on the coupled resonator technology, in which the coupling between resonators is a substitute for the quarter-wavelength (λ/4) line of a traditional Wilkinson PD, which provides the PD with a frequency selection function. The filtering PDs in [7]–[13] have been designed for dual-band applications.
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