High selectivity electrically tunable coaxial filter with constant absolute bandwidth
A high-selectivity, filter technology, applied in waveguide-type devices, circuits, electrical components, etc., can solve the problems of difficult tuning, high insertion loss and cost, limited to less than 12%, etc., to achieve high quality factor, low Insertion loss, the effect of reducing insertion loss
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[0034] Example 1
[0035] Such as figure 1 As shown, a highly selective ESC coaxial filter with a constant absolute bandwidth includes a metal cavity and a coaxial resonant rod located in the metal cavity, a frequency adjustment circuit, an input port, an output port and a PCB board. A metal layer is provided on the lower surface of the PCB board, the metal layer is connected to the bottom surface of the metal cavity, the PCB board is embedded in the bottom surface of the metal cavity, the surface of the PCB board is provided with a metal disc and a frequency adjustment circuit, and one end of the coaxial resonance rod is connected to The top surface of the metal cavity is connected to realize a short circuit, and the other end is connected to a frequency adjustment circuit through a metal disc to form a frequency adjustable resonator. The input port and the output port are connected with the coaxial resonator rod to realize the feeding of the coaxial resonator. The coaxial reso...
Example Embodiment
[0062] Example 2
[0063] Such as Figure 2-Figure 4 As shown, this embodiment provides a second-order highly selective ESC coaxial filter with constant absolute bandwidth. The overall size of the circuit is W×L×H, specifically 23mm×47.5mm×48mm or 0.111×0.054 ×0.112λ g 3 , Λ g Is the waveguide wavelength corresponding to the lowest frequency. The specific size is: w 1 =2.5mm, l=3.5mm, R=3mm, h 1 =h 2 = 4mm, h 3 = 39.17mm, h 4 =10.5mm, d=7mm, Gap=11.4mm; the capacitance value is 100pF, and the resistance value is 47kΩ.
[0064] Figure 5 with Image 6 The results of simulation and actual measurement of the filter designed with the above parameters are given. The simulation is completed by using the commercial electromagnetic simulation software ADS and HFSS of Agilent and ANSYS. The actual test is using the network analyzer 5071C And DC voltage source SPD3303x to complete. Figure 5 It is the transmission characteristic curve of the filter simulation and test, the horizontal axis r...
Example Embodiment
[0066] Example 3
[0067] Such as Figure 7-9 As shown, this embodiment provides a third-order high-selectivity ESC coaxial filter with a constant absolute bandwidth. The coaxial resonance rods are three, arranged in an equilateral triangle. The overall circuit is W×L×H, and the size is 38.5mm×53mm×46.1mm or 0.125×0.091×0.109λ g 3 , Λ g Is the waveguide wavelength corresponding to the lowest frequency. The specific size is: w 1 =3.3mm, w 2 =4.25mm, w 3 = 15.5mm, l 1 =11mm, l 2 =6.7mm, l 3 =15mm, l 4 =23mm, R=3mm, h 1 =h 2 =4mm, h 3 = 37.27mm, h 4 =11.69mm, d=13.4mm; the capacitance value is 100pF, and the resistance value is 47kΩ.
[0068] Picture 10 with Picture 11 The results of simulation and actual measurement of the filter designed with the above parameters are given. The simulation is completed by using the commercial electromagnetic simulation software ADS and HFSS of Agilent and ANSYS in the United States. The actual test is using the network analyzer 5071C And DC volta...
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