Isosceles Right Triangle Dielectric Ceramic Balun Filter Based on Space Coupling Mechanism

Abstract

The invention discloses an isosceles right triangle dielectric ceramic balun filter based on a space coupling mechanism. The filter includes a dielectric substrate, a first resonator and a second resonator located on the upper surface of the dielectric substrate, and the upper surface of the two resonators is connected to the upper surface of the dielectric substrate. The lower surface is coated with a metal layer; the input port and the two output ports are respectively located on the upper surface of the first and second resonators and are perpendicular to the dielectric substrate; both resonators are isosceles right triangle dielectric resonators. The magnetic wall in the working mode of the first resonator is located on the central axis of the hypotenuse, cutting the first resonator in half along the magnetic wall can halve the size of the resonator without changing the resonant frequency, and obtain the second resonator, and at the same time obtain the second resonator The electric field distribution on both sides of the central axis of the resonator is of equal amplitude and opposite phase. The invention realizes harmonic suppression of the isosceles triangle resonator on the premise of ensuring high performance and miniaturization, has good out-of-band selectivity, and high isolation between two ports, and is very suitable for modern wireless communication systems.

Description

technical field [0001] The invention belongs to the technical field of microwave passive devices, in particular to an isosceles right triangle dielectric ceramic balun filter based on a space coupling mechanism. Background technique [0002] With the development of microwave technology, the requirements for high-performance, miniaturized and low-cost circuits continue to increase, and the requirements for highly integrated multi-functional microwave circuits, especially passive microwave components, in modern wireless communication systems are also increasing. Under this trend, the balun with filtering function has received more and more attention as a typical multifunctional device. It can not only realize the conversion of unbalanced to balanced signal, but also has the function of frequency selection. [0003] In recent years, researchers have studied a variety of integrated design methods. In Document 1 (F.Huang, J.Wang, L.Zhu, Q.Chen and W.Wu,"Dual-Band Microstrip Bal...

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Problems solved by technology

However, dielectric resonators have a large number of inherent harmonic modes that are difficult to remove in pure dielectric waveguide resonator designs

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