A Broadband Balanced Bandpass Filter with Reconfigurable Frequency and Bandwidth
A balanced band and filter technology, which is applied to waveguide devices, electrical components, circuits, etc., can solve problems such as limited performance, inability to meet the needs of broadband reconfigurable communication systems, and few research results on electronically adjustable balanced filters. Good electromagnetic compatibility
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Embodiment 1
[0037] Such as figure 1 As shown, the broadband balanced bandpass filter of this embodiment includes an upper layer microstrip line structure 1 and an active circuit, a middle layer dielectric substrate (not shown in the figure), a lower layer ground metal patch 2 and metal vias 3, The metal through hole 3 runs through the microstrip line structure 1, the dielectric substrate and the grounded metal patch 2 in sequence, so that the microstrip line structure 1 and the grounded metal patch 2 are connected through the dielectric substrate. The microstrip line structure 1 includes Two three-mode resonators and two pairs of input / output feed lines, the two three-mode resonators and two pairs of input / output feed lines are bent, so that the entire microstrip line structure 1 is two left-right symmetrical E-type structure;
[0038] The two three-mode resonators are respectively a first three-mode resonator and a second three-mode resonator, and the first three-mode resonator includes...
Embodiment 2
[0050] Such as figure 1 As shown, by loading varactor diodes on the transmission line and stubs of the three-mode resonator to independently control the odd and even mode resonant frequencies, a wideband balanced bandpass filter with reconfigurable frequency and bandwidth (also known as Fully adjustable wideband balanced bandpass filter) with independently tuned center frequency and bandwidth. The circuit and electromagnetic simulation software of this embodiment is Agilent Advanced Design System (ADS). The broadband balanced bandpass filter with reconfigurable frequency and bandwidth is selected and processed on a dielectric substrate with a dielectric constant of 2.55, a thickness of 0.8mm, and a loss tangent of 0.0029. Figure 1 ~ Figure 3 The specific physical dimensions are shown in Table 1 below.
[0051]
[0052] Table 1 Dimensions of broadband balanced bandpass filter with reconfigurable frequency and bandwidth
[0053] This embodiment is measured by Agilent 5230...
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