A Tunable Bandpass Filter with Constant Bandwidth
A constant bandwidth, filter technology, applied in the field of electronics, can solve problems such as inability to extend beyond the third order, complex structure, etc., to achieve the effect of simple structure, increased frequency selection characteristics, and easy adjustment
Active Publication Date: 2016-06-01
SOUTHWEST JIAOTONG UNIV
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[0004] In order to overcome the technical problem that the structure of the constant bandwidth bandpass filter in the prior art is complicated, and it is only suitable for the second order and cannot be extended to the third order or above, the present invention provides an adjustable bandpass filter with a constant bandwidth
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[0015] The present invention will be described in further detail below in conjunction with accompanying drawing and specific embodiment, but the scope of protection of the present invention is not limited to the scope stated in the following table:
[0016] An adjustable band-pass filter with constant bandwidth includes an upper metal microstrip structure, a middle dielectric substrate and a lower metal grounding plate. The upper metal microstrip structure includes an input port feeder 10, an output port feeder 12, and six sections of 1 / 2 wavelength microstrip lines 1 to 6, and the six sections of 1 / 2 wavelength microstrip lines 1 to 6 and the input port The feed line 10 and the output port feed line 12 form a square ring structure; wherein the first 1 / 2 wavelength microstrip line 1, the second 1 / 2 wavelength microstrip line 2, the fifth 1 / 2 wavelength microstrip The line 5 and the sixth one-half wavelength microstrip line 6 are not connected to each other to form the inner ri...
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A constant-bandwidth tunable bandpass filter belongs to the technical field of electronics and comprises an upper layer micro-strip structure, a middle layer medium substrate and a lower layer ground connection metal sheet. The micro-strip structure is composed of an input / output micro-strip line and six resonators and in a square ring shape. Each resonator is composed of a one-half wavelength micro-strip line and a variable-capacitance diode. The first resonator and an input feeder line are coupled in parallel, the sixth resonator and an output feeder line are coupled in parallel, the first resonator and the second resonator are coupled through a ground connection transmission line, the third resonator and the fourth resonator are coupled through a ground connection transmission line, the fifth resonator and the sixth resonator are coupled through a ground connection transmission line, the second resonator and the third resonator are coupled in parallel, and the fourth resonator and the fifth resonator are coupled in parallel. In addition, the second resonator and the fifth resonator are coupled in a cross mode to generate transmission zero, and the first resonator and the sixth resonator are coupled in a cross mode to generate transmission zero. The constant-bandwidth tunable bandpass filter has the advantages of being simple in structure and easy to adjust and achieving six-step constant-bandwidth tunableness. Furthermore, the cross coupling is also introduced, so that the frequency selection of the filter is greatly improved.
Description
technical field [0001] The invention belongs to the field of electronic technology, and relates to an adjustable band-pass filter in the radio frequency / microwave electronic technology, in particular to an adjustable band-pass filter with constant bandwidth characteristics. Background technique [0002] In the golden frequency band below 6GHz, there are already various mobile communication systems (such as GSM, CDMA, WCDMA, TD-SCDMA, LTE), wireless local area network (WLAN), etc., so it supports multi-frequency and multi-mode wireless communication of various standards Radio frequency technology has become a research and application hotspot. As an important component of the radio frequency transceiver, the filter plays the role of frequency selection or frequency suppression. If multiple filters are used in a multi-frequency multi-mode radio frequency transceiver, not only the cost is high but also it is not conducive to miniaturization. Therefore, adjustable or frequency ...
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IPC IPC(8): H01P1/203H01P7/08
Inventor 冯全源黄晓国
Owner SOUTHWEST JIAOTONG UNIV