Abstract
A compact quadruplexer with the functions of frequency division, frequency selection, and power splitting/combining is presented in this article. Four tri-mode stub-loaded resonators were adopted to construct the compact multifunctional quadruplexer with a third-order filtering response. The four-channel passbands of the quadruplexer were controlled and realized independently by using the distribution coupling configuration. The output coupling structure was designed to be symmetrical with equal power division for each channel. To achieve a satisfactory isolation performance, a resistor was loaded between the open ends of the output coupled lines for each channel. A microstrip multifunctional quadruplexer operating at 1.1, 1.44, 1.73, and 2.06 GHz was fabricated. The prototype circuit size of the multifunctional quadruplexer was only approximately 0.4 λ <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">g</sub> × 0.59 λ <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">g</sub> . Moreover, the output isolations were >27 dB within the entire frequency bands.
Highlights
Recent developments in radio frequency (RF) and microwave electronic systems have resulted in high demands on highperformance multifunctional circuits
In quad-band applications, to achieve frequency division, frequency selection, and power division functions, a traditional solution is to connect a power divider (PD) to each frequency channel of a quadruplexer comprising a five-port matching circuit and four different frequency bandpass filter (BPF) (Fig. 1). Such an architecture requires nine circuits, which increases the system size and cost. Another effective solution is to integrate these circuits into a single device as a multifunctional quadruplexer, which can achieve more than 50% size reduction compared to the cascaded configuration of a FIGURE. 1
Four tri-mode resonators operating at different frequencies were used to construct the multifunctional quadruplexer
Summary
Recent developments in radio frequency (RF) and microwave electronic systems have resulted in high demands on highperformance multifunctional circuits. In quad-band applications, to achieve frequency division, frequency selection, and power division functions, a traditional solution is to connect a PD to each frequency channel of a quadruplexer comprising a five-port matching circuit and four different frequency BPFs (Fig. 1). 2. Coupling scheme of the proposed quadruplexer-integrated filtering PD.
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