Microstrip Eight-Channel Diplexer With Wide Stopband

Microstrip quad‐channel diplexer using quad‐mode square ring resonators

“…We can see from the figure that the two QMSRRs can generate four channels in two loads without any matching networks. Compared to the conventional coupling scheme based diplexer in Figure B, the proposed diplexer has a much smaller size since the 5‐port matching network is replaced by a coupling line …”

“…Compared to the conventional coupling scheme based diplexer in Figure 1B, the proposed diplexer has a much smaller size since the 5-port matching network is replaced by a coupling line. 6,9 The layout of the proposed quad-channel diplexer is shown in Figure 2, which consists of two QMSRR based bandpass filters (BPFs). Each QMSRR is composed of one square ring resonator and two open microstrip lines.…”

“…In multi‐service and multi‐band communication systems, multiplexers have been widely used in radio frequency (RF) front ends of both the receivers and transmitters. Multiplexers using planar microstrips, such as microstrip diplexers, triplexers and quadruplexers, have became more and more attractive as they are of compact size, low‐cost integration and high practicality.…”

Design of Microwave Microstrip Multiband Diplexers for System in Package

“…In [9], a four-channel diplexer based on opencircuited stub bandstop filters was introduced. The diplexer takes 10,12,19, and 21 GHz at common port 1 and separates 10 and 19 GHz to port 2, and 12 and 21 GHz to port 3. To save size, common resonators are employed to design a four-channel diplexer with limited design freedom [10].…”

“…In this paper, a four-channel diplexer and a six-channel diplexer in microstrip technology are investigated to extend [12]. To tackle the isolating issue, distributed coupling method is employed showing a very low loading effect among channels.…”