High isolation slot line duplexer applied to ultra-wideband channel and narrow-band channel

Abstract

The invention provides a high isolation slot line duplexer applied to an ultra-wideband channel and a narrow-band channel. The high isolation slot line duplexer comprises a first filter and a second filter, wherein the first filter and the second filter share a dielectric substrate and has a slotted line structure and a microstrip line structure; the slotted line structure is positioned on the lower layer of the dielectric substrate, and the microstrip line structure is positioned on the upper layer of the dielectric substrate; the bandwidth of the first filter is controlled through coupling among a U-shaped slotted line resonator, a first open stub and a second open stub, and can be controlled by adjusting intervals g1 among the U-shaped slotted line resonator, the first open stub and the second open stub; and the mode of resonance of the second filter can be controlled by loading the length of the stubs, accordingly the bandwidth of the second filter can be adjusted by adjusting the size of l5. According to the high isolation slot line duplexer, the bandwidths of the two filters can be adjusted independently; and the high isolation slot line duplexer is compact in structure, simple in circuit and high in frequency selectivity.

Description

technical field [0001] The invention relates to the field of duplexers, in particular to a high-isolation slotline duplexer applied to ultra-wideband channels and narrowband channels. Background technique [0002] Microwave duplexer is an important microwave device widely used in radio receivers. It is a crucial component for modern multi-frequency multi-service transceiver systems to share the same antenna. Its performance directly affects the work of RF front-end performance. The traditional duplexer design is to design two filters separately, and then connect them through a matching network. The existence of the matching network increases the circuit size, which is not conducive to miniaturization. Accordingly, some scholars use the shared resonator technology to replace the matching network. Although this greatly reduces the circuit size, this technology can only be applied to narrow-band systems, and the bandwidth is not easy to adjust. It is necessary to design a...

AI Technical Summary

Problems solved by technology

The traditional duplexer design is to design two filters separately, and then connect them through a matching network. The existence of the matching network increases the circuit size, which is not conducive to miniaturization

Accordingly, some scholars use the shared resonator technology to replace the matching network, which greatly reduces the circuit size, but this technology can only be used in narrowband systems, and the bandwidth is not easy to adjust

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