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Design of Improved Quadruple-Mode Bandpass Filter Using Cavity Resonator for 5G Mid-Band Applications
Published in Mangesh M. Ghonge, Ramchandra Sharad Mangrulkar, Pradip M. Jawandhiya, Nitin Goje, Future Trends in 5G and 6G, 2021
P. Satheesh Kumar, P. Chitra, S. Sneha
The basic circuitry of cavity and duplexer filters are highly tuned resonance circuits that can pass through only certain frequencies. A cavity filter is a resonator at the input and output inside a conducting “box” with resonating coupling loops. The widely used frequency range is from 40 MHz to 960 MHz. A better Q quality factor is obtained by increasing the stability efficiency at closely spaced frequencies (down to 75 kHz) and increasing the internal filter cavity length. Filters based on cavity resonators, in comparison to filters built on lumped-passive element LC resonators or planar cavity resonators, have better power handling capability and better insertion loss. It is popular to use cavity resonator filters in wireless and satellite applications.
Resonant Elements for Circuits and Waveguides
Published in Edward F. Kuester, Theory of Waveguides and Transmission Lines, 2020
A waveguide can be made to work as a resonator by connecting short circuits (i.e., perfectly conducting walls) at both ends of a uniform section of the waveguide with length H. For a hollow metallic waveguide, such a resonator is called a cavity resonator, examples of which are shown in Figure 13.9. Since each mode of an arbitrary waveguide has been shown in Section 9.3 to be equivalent to a transmission line, the modes of such cavities can be analyzed using the transmission-line equivalent circuit of Figure 13.10. The resonator of Figure 13.10 can thus be used to represent a wide variety of resonant structures. For each different waveguide mode with index m, the propagation constant of the transmission line should be replaced by that of the waveguide mode: γm(ω).
Design, Analysis and Validation of MCP Package for GaAs Monolithic Microwave Integrated Circuits Packaging
Published in IETE Journal of Research, 2022
Ravi Gugulothu, Sangam Bhalke, Lalkishore K, Ramakrishna Dasari
Generally, a cavity resonator oscillates at a resonant frequency, which is due to wave existence inside a hollow space of the device. A rectangular waveguide cavity resonator exists if two sides of a waveguide are closed with metallic walls. Then wave propagation along the z-direction will bounce off the sidewalls, thereby producing a resulting standing wave in the z-direction. TM case i. Ex(z = 0) = Ey(z = 0) = 0 to satisfy boundary conditions, then ρ = 1 and we have ii. Ex(z = -d) = Ey (z = -d) = 0 then we have With these conditions for guiding a wave to propagate βx = (mπ/a), βy = (nπ/b) as well as βz. In which neither m can be zero or nor n can be zero and p = 0 whereas Ez≠0 this results in the existence of TMmn0 mode. TE case As boundary conditions necessitate βx = (mπ/a), βy = (nπ/b) as well as βz = (pπ/d). If p = 0 then Hz = 0, therefore TE0np/TEm0p modes may result but not mode TEmn0.