Wide-stop-band three-mode dual-passband filter based on cross type multimode resonators

Abstract

The invention discloses a wide-stop-band three-mode dual-passband filter based on cross type multimode resonators. The wide-stop-band three-mode dual-passband filter comprises an input port feed line, an output port feed line, a first cross type multimode resonator, a second cross type multimode resonator, a dielectric substrate and a metal grounding plate. The first and second cross type multimode resonators are connected with each other through a metal through hole and are symmetry plane side loading type multimode resonators. The input port feed line, the output port feed line and the first and second cross type multimode resonators are arranged at the upper surface of the dielectric substrate. The metal grounding plate is arranged at the lower surface of the dielectric substrate. The input and output port feed lines include two parts of a 50ohm microstrip line conduction band and a feed line. The first cross type multimode resonator comprises two quarter-wavelength resonators and two symmetry plane loading units. The second cross type multimode resonator comprises two quarter-wavelength resonators and two symmetry plane loading units. The wide-stop-band three-mode dual-passband filter has characteristics of wide stop-band, high selectivity and low loss and is suitable for modern wireless communication systems.

Description

Technical field [0001] The invention relates to the technical field of microwave passive devices, in particular to a wide stopband three-mode double-passband filter based on a cross-type multimode resonator. Background technique [0002] In recent years, with the rapid development of modern wireless communications, various new communication standards and technologies have emerged one after another, such as GPS (Global Positioning System), GSM (Global System for Mobile Communications), Bluetooth, WLAN (wireless Local Area Network), WiMAX (Worldwide Interoperability for Microwave Access), 3G (TD-SCDMA) , WCDMA, CDMA2000) and 4G (TDD-LTE, FDD-LTE), etc. The emergence of these new technologies has greatly promoted social and economic development, but also caused congestion of the spectrum, so it can be compatible with multiple service frequency bands. The multi-passband communication system is becoming the development trend of modern wireless communication systems. The multi-pass ba...

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Problems solved by technology

[0003] In 2013, Songbai Zhang and Lei Zhu published "CompactSplit-TypeDual-BandBandpassFilterBasedonλ / 4Resonators" in IEEE MicrowaveAndWireless Components Letters (vol.23, no.7, pp.344-346, 2013), proposing a quarter-wavelength resonator The method of cascade design of multi-passband filters, although the design theory of this design method is relatively simple, but this method has not solved the problem of narrow bandwidth and large electrical size

Although the filters designed by this method have the characteristics of small size and high selectivity, they all require a defective ground structure, which increases the difficulty of processing and also destroys the signal integrity on the ground plane.

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