小型化印刷天线在宽带通信中的应用设计

发布时间：2018-05-31 06:33

本文选题：超宽带天线 + 多频段天线　；参考：《电子科技大学》2014年硕士论文

【摘要】：本文设计并研制了三种小型化平面印刷天线,主要工作概括如下:设计了一款共面波导馈电的超宽带天线。该天线满足超宽带通信频段(3.1-10.6GHz),且结构紧凑,尺寸较小,驻波比平坦,H面方向图是全向的。为了避免其它通信标准对超宽带通信的干扰,在超宽带天线上设计了三个阻带。第一个阻带来自于辐射贴片上腐蚀两个以馈线为轴对称的倒L型槽,槽长约为中心频率对应波长的四分之一,过滤的频段为WIMAX(3.3-3.6 GHz),驻波比最大值可达到10;第二个阻带来自于地板两边所腐蚀Z型的槽,槽长也约为中心频率对应波长的四分之一,过滤的频段为WLAN(5.125-5.825 GHz),驻波比最大值可达到9;第三个阻带来自于介质基板背面增加一个开口环,与馈线中心圆盘谐振产生阻带,开口环周长为中心频率对应波长的二分之一,过滤了海事卫星通信频段(7.25-7.75GHz),驻波比最大值可达到6。设计一种超宽带与窄带相结合的多频段天线。天线的地板与辐射贴片异面,地板上边缘中心腐蚀的矩形槽拓展带宽,满足超宽带通信(3.1-10.6 GHz)。在辐射贴片两边缘腐蚀槽,并且控制槽的位置、槽的长和宽使其满足了两个通信标准,即GSM上行频段(1.710-1.785 GHz)和WLAN(2.4-2.48 GHz)。以平面缝隙天线为基础,设计了一个频率可重构天线,天线尺寸非常小,只有25?20?1mm3,天线采用正面微带馈电。该天线在地板中间形成一个主辐射槽,在主辐射槽两侧,又腐蚀了两个矩形槽,在槽中共加载了四个PIN二极管。天线可以工作在三种模式,即:(1)工作频段为WIMAX(3.3-3.6 GHz)。(2)工作频段为WLAN(5.725-5.825 GHz)。(3)上述两个作频段同时工作。通过控制二极管的通断状态使天线工作模式能自由切换,三种模式下的方向图也非常相似,达到预期设计目标。
[Abstract]:In this paper, three kinds of miniaturized planar printed antennas are designed and developed. The main work is summarized as follows: a coplanar waveguide fed UWB antenna is designed. The antenna can meet the requirement of 3.1-10.6 GHz in the UWB communication band. The antenna is compact and small in size. The VSWR flattened H-plane pattern is omnidirectional. In order to avoid interference of other communication standards to UWB communication, three stopbands are designed on UWB antenna. The first stopband is caused by corrosion on the radiation patch of two inverted L-shaped grooves with an axisymmetric feed, the length of which is about 1/4 of the wavelength corresponding to the central frequency. The filter frequency band is WIMAX(3.3-3.6 GHz, and the maximum standing wave ratio can reach 10. The second stop band comes from the Z-shaped groove corroded on both sides of the floor, and the length of the channel is about 1/4 of the corresponding wavelength of the center frequency. The filter frequency band is WLAN(5.125-5.825 GHz, and the maximum standing wave ratio can reach 9. The third stopband comes from the addition of an open loop on the back of the dielectric substrate, which resonates with the central disk of the feeder. The circumference of the opening ring is 1/2 of the wavelength corresponding to the central frequency. The maximum VSWR of 7.25-7.75GHz / s is obtained by filtering the frequency band of Inmarsat communication. A multi-band antenna combining UWB and narrow band is designed. The antenna floor and radiation patch have different surfaces, and the rectangular grooves corroded at the edge of the floor extend the bandwidth to meet the UWB communication requirements of 3.1-10.6 GHz. At the edge of the radiating patch, the position of the cell is controlled, and the length and width of the cell satisfy the two communication standards, I. e., 1.710-1.785 GHz in the GSM uplink band and 1.710-1.785 GHz in the WLAN(2.4-2.48 band. Based on the planar slot antenna, a frequency reconfigurable antenna is designed. The size of the antenna is very small, and the antenna size is only 25 / 20 / 1 mm / 3. The antenna is fed by the front microstrip. The antenna forms a main radiating slot in the middle of the floor. Two rectangular grooves are corroded on both sides of the main radiating slot, and four PIN diodes are loaded in the slot. The antenna can operate in three modes, that is, the working frequency band is WIMAX(3.3-3.6 GHz ~ (2) and the working frequency band is WLAN(5.725-5.825 GHz ~ (3) the above two working bands work simultaneously. By controlling the on-off state of the diode, the antenna mode can be switched freely. The pattern of the three modes is very similar, and the desired design goal is achieved.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN822

【共引文献】