Microwave terminal short circuit half-wavelength tunable resonator and microwave tunable filter manufactured by same

Abstract

The invention discloses a microwave terminal short circuit half-wavelength tunable resonator and microwave tunable filter manufactured by the microwave terminal short circuit half-wavelength tunable resonator. The microwave terminal short circuit half-wavelength tunable resonator comprises a terminal short circuit half-wavelength transmission line resonator, two ends of the half-wavelength transmission line resonator are grounded, a variable capacitance diode is connected at the middle part of the half-wavelength transmission line resonator, and the other end of the variable capacitance diodeconnected at the middle part of the half-wavelength transmission line resonator is grounded. The microwave tunable filter is formed by coupling two identical microwave terminal short circuit half-wavelength trough-line resonators arranged in opposition. The invention has the advantages of compact structure, small size, light weight, easy integration and the like; the microwave terminal short circuit half-wavelength tunable resonator designed in the invention can tune fundamental resonant frequency on the basis of not changing secondary resonant frequency, thus being favorable for inhibiting secondary harmonic and improving system performance.

Description

Technical field: [0001] The invention relates to a microwave terminal short-circuit half-wavelength tunable resonator and a microwave tunable filter made thereof. Background technique: [0002] In recent years, mobile phones and wireless communication services have developed rapidly, and various technical standards have been released one after another, such as UMTS, IEEE802.11a, b, g, n, UWB, WIMAX and GPS. It is conceivable that today, when multiple standards coexist and develop, to be compatible with various technologies requires separate sending / receiving systems, which will greatly increase the size and cost of the equipment. Therefore, we need a diversified system that can meet the requirements of various communication frequency bands and adapt to the development of wireless communication in the future. [0003] The tunable system composed of frequency tunable filter and antenna meets the requirements of multi-band communication, and is a research hotspot in recent yea...

AI Technical Summary

Problems solved by technology

Most systems hope to suppress the second harmonic in order to reduce intermodulation distortion, but this form of second harmonic is always accompanied by the fundamental wave, and the second resonance frequency is always twice the fundamental resonance frequency, so it is difficult to reduce the system The intermodulation distortion affects the performance of the circuit; the second is the intermediate loading form of the open-ended transmission line, such as Novel Centrally Loaded Resonators and Their Applications to Bandpass Filters published by Xiu Yin Zhang (such as Figure 6) This form can change the second resonance frequency of the transmission line resonator by adjusting the value of the varactor Keep the fundamental resonant frequency unchanged; neither of the above two forms can achieve the purpose of only adjusting the fundamental resonant frequency on the basis of keeping the second resonant frequency unchanged

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