Novel ultra-wideband pass filter based on multimode resonance structure
A technology of band-pass filter and multi-mode resonance, which is applied in the field of new ultra-wideband band-pass filters, can solve the problems of square coefficient difference, square coefficient dependence on capacitance value and quantity, etc., achieve improved square coefficient, simple structure, and increase resonance point effect
Inactive Publication Date: 2015-01-21
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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However, the above-mentioned literature has the defect of poor squareness coefficient, because its low-frequency stop band is mainly realized by interdigitated capacitors connected in series, and its squareness coefficient depends on the capacitance value and quantity
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[0013] see figure 1 , the present invention belongs to a microstrip filter, which includes a substrate 1, a metal reflective layer covering the lower surface of the substrate 1, and first to third resonant rings arranged on the upper surface of the substrate 1, and the key also includes the first to third resonant rings. The fourth inter-line capacitance; the first inter-line capacitance 2-1 is connected in series with the microstrip line 4, and the microstrip line and the first resonant ring 3-1 are connected in parallel by means of resonant ring branches to form a resonant unit, three structures The same resonant units are sequentially connected in series and then connected in series with the fourth inter-line capacitor 2-4.
[0014] The upper surface of the substrate 1 further includes an input port 5 and an output port 6, which are respectively connected in series with the first inter-line capacitor 2-1 and the fourth inter-line capacitor 2-4.
[0015] The input port 5 is...
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The invention discloses a novel ultra-wideband pass filter based on a multimode resonance structure, which comprises a substrate, a metallic reflection layer covering the lower surface of the substrate, and resonant rings arranged on the upper surface of the substrate, and is characterized in that the novel ultra-wideband pass filter further comprises a first line capacitor, a second line capacitor, a third line capacitor and a fourth line capacitor, wherein the first line capacitor is in series connection with a microstrip line; the microstrip line is in parallel connection with the first resonant ring by a resonant ring branch knot to form a resonance unit; and the three resonance units in the same structure are in series connection in sequence and then are in series connection with the fourth line capacitor. The novel ultra-wideband pass filter is simple in structure; a greater operation bandwidth can be realized only by the three resonant rings; the operation bandwidth of the novel ultra-wideband pass filter is 3.1-10.6GHz, so that requirements of the ultra-wideband filter can be met; and the rectangle coefficient is improved by adopting the structure that the resonance units are in series connection.
Description
technical field [0001] The invention relates to a filter in the technical field of communication, in particular to a novel ultra-wideband bandpass filter based on a multi-mode resonance structure, the passband of which is 3.1-10.6GHz. Background technique [0002] Under the background of the rapid development of modern wireless communication, the research of UWB system has broad application prospects and huge market value. Ultra-Wide Band (UWB) has the characteristics of high data transmission rate, low power consumption and anti-interference ability. In 2002, the US Federal Communications Commission (FCC) allocated the frequency spectrum from 3.1GHz to 10.6GHz to UWB devices. Therefore, As one of the key components in wireless communication systems, UWB filters have attracted much attention. [0003] The traditional filter theory system is very effective in the design of each bandpass filter under the assumption of a narrow passband. But there will be defects in ultra...
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IPC IPC(8): H01P1/203
Inventor 王朗李乐伟杨顺
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA