Third-order electronically tuned bandpass filter with constant bandwidth
A band-pass filter and bandwidth technology, applied in the field of filters, can solve problems such as limiting application scenarios, increasing the overall filter size, and complex control.
Active Publication Date: 2016-08-24
SOUTHWEST JIAOTONG UNIV
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Problems solved by technology
[0005] However, the above-mentioned design method has the following technical defects in the actual use process: first, the existing adjustable high-order filter is generally 4th order, and there are many adjustable parameters in the design process, which is extremely complicated to control; The method of combining band-stop filter and adjustable band-pass filter to improve selectivity will increase the size of the overall filter and limit its application scenarios
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[0074] In this embodiment, the third-order electronically adjustable bandpass filter with constant bandwidth has an adjustable frequency range: 0.98-1.40GHz, an absolute bandwidth of 165±15MHz, and is manufactured on a dielectric substrate with a relative permittivity of 2.2 and a loss factor of 0.0009. superior. The varactors in the resonator all use SMV1413 from Skyworks, and the varactors in the main transmission line 4 all use SMV1405 from Skyworks.
[0075] The total length l of the microstrip line in the first resonator 1 1 =14.8mm, the width is 0.8mm; the total length of the microstrip line in the second resonator 2 is l 2 = 8.7mm, the width is 1.0mm; the coupling length between the first resonator 1 and the second resonator 2 is l c =5mm, spacing g c = 0.2mm; the length of the microstrip line forming the band stop unit is l b1 =10.8mm, the width is 0.4mm, l b2 =1.0mm, width 2.0mm; main transmission line 4 length l p =23.8mm, the width is 0.2mm, the length of the ...
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The invention discloses a third-order electric regulation band-pass filter with high selectivity, simple electric regulation control, small overall size and constant absolute bandwidth and constant bandwidth during the process of adjusting the center frequency of the filter. The third-order electronically adjustable bandpass filter with constant bandwidth of the present invention realizes the adjustment of the external Q value by adjusting the varactor loaded on the main transmission line, and the first resonator, the second resonator, and the third resonator adopt Unified voltage feed, and the out-of-band suppression level at low frequencies can be flexibly adjusted by changing the capacitance loaded on the band-stop unit, the control is simple, easy to design, the selectivity is high and the absolute bandwidth remains constant during the adjustment process. In addition, in Under the premise of ensuring high selectivity and harmonic suppression function, the design of band-stop unit combined with band-pass filter greatly reduces the overall size of the filter. It is suitable for popularization and application in the field of filter technology.
Description
technical field [0001] The invention belongs to the technical field of filters, and in particular relates to a third-order electronically adjustable band-pass filter with constant bandwidth. Background technique [0002] With the development of wireless communication technology, especially the development of cognitive radio and electronic warfare, there are strict requirements for wireless transceivers in terms of broadband, miniaturization, multi-protocol, reconfigurable, etc., and there is an urgent need for wireless transceivers to break through the traditional The fixed mode of the communication standard realizes the free adjustment / switching of its carrier frequency, bandwidth, beam direction and other indicators within a certain range, so as to build a multi-mode communication link to improve the anti-interference ability and robustness, and increase the frequency spectrum. The purpose of utilization rate, expansion of communication capacity and quality of service. Si...
Claims
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IPC IPC(8): H01P1/203
Inventor 冯全源贾定宏
Owner SOUTHWEST JIAOTONG UNIV