Reconfigurable substrate integrated waveguide bandpass filter and reconfigurable method of filter
A substrate-integrated waveguide and band-pass filter technology, which is applied to waveguide-type devices, electrical components, circuits, etc., can solve the problems that the control voltage of the varactor diode cannot be directly applied, the filter insertion loss is large, and the control structure is complicated. To achieve the effect of simple and flexible design, size reduction, and reconfiguration
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Embodiment 1
[0035] At present, most of the band-pass filters based on the substrate-integrated waveguide form are etched resonant rings of different shapes on the surface of the substrate. Although the structure is simple, it is not suitable for multi-band applications. In order to apply to multi-band applications, it is necessary to design multiple filters with different frequency bands. The engineering is more complicated, which not only causes waste of design and resources, but also inconveniences in use and time delay. Now it is necessary to process multi-band signals. For RF front-end circuits, there is an urgent need for a reconfigurable substrate-integrated waveguide bandpass filter.
[0036]The varactor is a low-cost and easy-to-control tunable device. At present, most of the microwave tunable filters based on the varactor are implemented on the microstrip. The substrate-integrated waveguide bandpass filter is still relatively few, because the metal column on one side of the subst...
Embodiment 2
[0041] The overall composition and structural characteristics of the reconfigurable substrate-integrated waveguide bandpass filter are the same as those in Example 1. The non-metallized via hole is arranged in the center of the resonant ring, and the diameter of the via hole is the same as the structure size of the varactor placed in the via hole. Matching, the margin between the diameter of the via hole and the structure size of the varactor diode is 0.1mm, which ensures that the varactor diode is easy to weld with the metal layer of the integrated waveguide on the substrate, and ensures the stability of the varactor diode in the via hole; The diameter of the metallized via should not be too large, otherwise it will affect the continuity of the field in the integrated waveguide of the substrate, and the filtering performance will be deteriorated. In this example, the model of the varactor diode is SMV1405.
Embodiment 3
[0043] The overall composition and structural features of the reconfigurable substrate-integrated waveguide bandpass filter are the same as those in Embodiment 1-2, see figure 1 and image 3 In the present invention, a DC blocking capacitor 9 is installed at the opening of the inner ring of the resonance ring. One end of the DC blocking capacitor is connected to the metal sheet between the inner and outer rings of the resonance ring, and the other end is connected to the metal sheet inside the resonance ring. The width of the inner and outer rings of the two resonant rings is the same, and the width matches the structure size of the DC blocking capacitor, so that the DC blocking capacitor can just be connected to the inner ring, ensuring the safety and reliability of the reconfigurable substrate integrated waveguide bandpass filter Work. The placement of the DC blocking capacitor 9 enables the DC voltage to be applied to both ends of the varactor diode, without causing a shor...
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