【摘要】：隨著無線移動技術的迅猛發(fā)展,人們對各種設備集成化、小型化和多功能化要求越來越高,這給無線通信系統(tǒng)的發(fā)展帶來了很大的機遇和挑戰(zhàn),也給研究人員提出了更高的要求。濾波器和天線作為無線通信設備中的重要器件,更加要求向著集成化、多頻化方向發(fā)展。將天線和濾波器集成設計,不僅能有效降低通信設備的尺寸,而且能提高抗干擾性和通信質量,因此,具有較高的研究價值。WLAN已經成為寬帶接入的有效手段之一,使用WLAN的區(qū)域及其承載的業(yè)務愈來愈多。其中,IEEE802.11b標準的2.4GHz頻段(2.40～2.48GHz)和IEEE802.11a標準的5GHz頻段(5.15-5.35GHz)是最常用的兩個頻段,故研究應用于2.4GHz頻段和5GHz頻段WLAN系統(tǒng)中的濾波天線是十分有意義的。論文主要研究了濾波天線的設計原理與實現(xiàn)方法。在此基礎上,設計了三款應用于WLAN通信系統(tǒng)的濾波天線。第一款濾波天線是應用于WLAN 5GHz頻段的微帶結構的濾波天線,首先根據(jù)微帶濾波器理論設計了一款WLAN(5.15～5.35GHz)頻段的帶通濾波器,然后以該濾波器為基礎,改變第二階諧振器,通過和缺陷地結構相結合的方法,實現(xiàn)了濾波天線的功能；第二款濾波天線是應用于WLAN 2.4GHz頻段的二元濾波天線陣,其中,濾波天線單元是通過將基片集成波導結構的圓柱腔濾波器與微帶貼片天線集成設計而成的,濾波天線陣采用威爾金森功分器進行饋電；第三款濾波天線是同時工作在2.4GHz頻段和5GHz頻段的雙頻WLAN濾波天線,該濾波天線通過在“田”字形雙頻天線的饋線部分加載階梯阻抗諧振器的方法設計而成。論文采用理論設計與電磁仿真軟件仿真相結合的方法進行設計,并根據(jù)設計結果對三款濾波天線進行了加工與測試。測試結果表明,論文設計的第一款濾波天線的最大增益為1.85dBi；第二款濾波天線陣的最大增益為5dBi,；第三款雙頻濾波天線在兩個頻段的最大增益分別為1.85dBi和2.27dBi,且三款濾波天線帶外抑制特性較好,且結構簡單、體積小、成本低,基本滿足WLAN系統(tǒng)的要求。
[Abstract]:With the rapid development of wireless mobile technology, people have higher and higher requirements for the integration, miniaturization and multifunction of various devices, which brings great opportunities and challenges to the development of wireless communication system. It also puts higher demands on researchers. As an important device in wireless communication equipment, filters and antennas need to be integrated and multi-frequency. The integrated design of antenna and filter can not only effectively reduce the size of communication equipment, but also improve the anti-interference and communication quality. Therefore, WLAN has become one of the effective means of broadband access. There are more and more areas using WLAN and its service. The 2.4GHz band (2.40~2.48GHz) of IEEE 802.11b standard and the 5GHz band (5.15-5.35GHz) of IEEE802.11a standard are the two most commonly used bands, so it is very meaningful to study the filter antenna applied in 2.4GHz band and 5GHz band WLAN system. This paper mainly studies the design principle and realization method of filter antenna. On this basis, three filter antennas used in WLAN communication system are designed. The first filter antenna is a microstrip filter antenna used in WLAN 5GHz band. Firstly, a band pass filter in WLAN (5.15~5.35GHz) band is designed according to the theory of microstrip filter, and then the second order resonator is changed based on the filter. The function of the filter antenna is realized by combining with the defective ground structure. The second filter antenna is a binary filter antenna used in the WLAN 2.4GHz band, in which, The filter antenna unit is designed by integrating the cylindrical cavity filter with the microstrip patch antenna. The filter antenna array is fed by Wilkinson power divider. The third filter antenna is a dual-frequency WLAN filter antenna which works in both 2.4GHz band and 5GHz band. The filter antenna is designed by loading step impedance resonator into the feeder of "Tian" zigzag double frequency antenna. The paper adopts the method of combining the theory design and electromagnetic simulation software to design, and according to the design results, the three filter antennas are machined and tested. The test results show that the maximum gain of the first filter antenna is 1.85 dBi.The second filter antenna has a maximum gain of 5 dBig. The maximum gain of the third dual-frequency filter antenna is 1.85dBi and 2.27dBi. the outband suppression characteristics of the three filter antennas are good, and the structure is simple, the volume is small and the cost is low, which basically meets the requirements of the WLAN system.
【學位授予單位】：大連海事大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TN925.93;TN820

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本文編號：2214798