發(fā)布時(shí)間：2019-02-14 07:24

【摘要】：針對傳統(tǒng)m推演型濾波器插入損耗大、帶內(nèi)平坦度不理想等問題,提出了一種改進(jìn)型帶通濾波器設(shè)計(jì)優(yōu)化方法。本文首先介紹了濾波器各子級的設(shè)計(jì)方法,利用ADS對濾波器參數(shù)進(jìn)行迭代優(yōu)化設(shè)計(jì),并采用PCB工藝制備了帶通濾波器樣品同時(shí)進(jìn)行了傳輸特性的測量,最后將其實(shí)際應(yīng)用于泄漏電纜周界入侵檢測系統(tǒng)中提高了硬件前端的信噪比。測量結(jié)果表明,在25.75~36.25 MHz的通帶范圍內(nèi),插入損耗小于1.5 d B,帶內(nèi)平坦度優(yōu)于0.5d B,反射系數(shù)小于-15 d B,過渡帶性能理想;在陷波點(diǎn)20 MHz、45 MHz處衰減大于-50 d B。在本文的最后,對周界入侵檢測系統(tǒng)漏報(bào)率、誤報(bào)率、正確率進(jìn)行了初步測試,結(jié)果表明虛警率從每小時(shí)1次減少至2天內(nèi)未發(fā)生報(bào)警,該濾波器結(jié)構(gòu)有效地解決了系統(tǒng)虛警率高的問題,提高了系統(tǒng)的穩(wěn)定性。
[Abstract]:Aiming at the problems of large insertion loss and unsatisfactory in-band flatness of the traditional m-derived filter, an improved design optimization method of bandpass filter is proposed. In this paper, the design method of each sub-level of filter is introduced, the parameters of filter are optimized iteratively by ADS, and the sample of bandpass filter is prepared by PCB process, and the transmission characteristic is measured at the same time. Finally, it is applied to the leakage cable perimeter intrusion detection system to improve the signal-to-noise ratio of the hardware front end. The results show that the insertion loss is less than 1.5 dB, the in-band flatness is better than 0.5 dB, and the reflection coefficient is less than -15 dB in the range of 25.75 ~ 36.25 MHz. At the notch point of 20 MHz,45 MHz, the attenuation is greater than -50 dB. At the end of this paper, the false alarm rate, false alarm rate and false alarm rate are reduced from once an hour to 2 days. The filter structure can effectively solve the problem of high false alarm rate and improve the stability of the system.
【作者單位】： 寧波大學(xué)信息科學(xué)與工程學(xué)院;
【基金】：國家自然科學(xué)基金(61571251,61501272) 浙江省公益技術(shù)應(yīng)用研究項(xiàng)目(2015C34004) 寧波市自然科學(xué)基金(2016A610064)
【分類號】：TN713

【相似文獻(xiàn)】

相關(guān)期刊論文 前1條

1 李晶皎;許哲萬;王愛俠;陳勇;;高速包分類平臺的FPGA設(shè)計(jì)[J];東北大學(xué)學(xué)報(bào)(自然科學(xué)版);2012年08期

，

本文編號：2421970