Design and simulation of Microstrip M-patch antenna with double layer
Design and simulation of Microstrip M-patch antenna with double layer
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双层微带M贴片天线的设计与仿真
DOI：
10.1109/amta.2008.4763102
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发表时间：
2008
期刊：
影响因子：
--
通讯作者：
G. Jegan
中科院分区：
文献类型：
--
作者：
T. Jayanthy;M. Sugadev;J. Ismaeel;G. Jegan
在本文中，我们将讨论适用于各种应用的微带 M 贴片天线的设计当前趋势，这是之前从未尝试过的创新性质。这为不同频率范围和新应用开辟了一条新途径，而且可以轻松实现并具有最大优势。在矩形微带贴片天线 [RMSA] 中，具有负电容和负电感以增强带宽。微带天线已被发现是有利的，因为它们具有： 1. 薄型 2. 制造成本低廉并且与单片微波集成电路设计（MMIC）兼容。但它们也因 (a) 效率低 (b) 阻抗带宽窄而受到影响。天线的输入阻抗往往对频率的变化敏感，因此天线输入阻抗与实际固定值的偏差通常决定天线的工作范围。 MSDA的输入阻抗取决于其几何形状、尺寸和馈电类型。因此，天线输入阻抗是控制辐射功率和阻抗带宽的重要设计参数。在大多数应用中，带宽限制是由于阻抗不匹配而发生的。在这方面，微带天线由于电抗大而具有窄带宽。随着微带天线的应用领域广泛，人们开发了许多技术来改善其有限的带宽。提高带宽的一个直接应用是增加支撑微带贴片的基板的厚度。然而，在厚基板上有效馈送贴片的能力存在限制，并且辐射效率会随着基板厚度的增加而降低。克服这种频带限制问题的技术可以通过使用寄生项元件、外部匹配以及分离馈源和天线来实现。邻近耦合方法使用连接到馈线的阻抗匹配短截线来实现 13% 的带宽。在谐振频率附近具有一对狭缝的宽带矩形贴片天线将带宽提高至 24%。使用无源共面匹配网络可以获得10-12%的带宽。使用微带缝隙天线中的 L 和 T 缝隙实现了 60% 的阻抗带宽，但增益和辐射图会失真。使用孔径耦合天线可以实现大于20%的带宽和低于-30db的交叉极化水平。当增加一个寄生环时，环形天线的带宽可以显着增加。
In this paper, we are going to discuss about the current trends in the design of Microstrip M patch antenna intended for various applications and it is a innovative nature never tried out earlier. This opens up a new avenue for different frequency ranges and new applications yet easily realizable with maximum advantages. In rectangular micro strip patch antennas [RMSA] with negative capacitance and inductance for bandwidth enhancement. Micro strip antennas have been found favorable because they are : 1. low profile 2. inexpensive to manufacture and compatible with monolithic microwave integrated circuit designs (MMIC). But they also suffer due to (a) low efficiency (b) Narrow impedance band width. Input impedance of an antenna tends to be sensitive to changes in frequency, hence deviation of the antennas input impedance from a real fixed value often determines the operational range of the antenna. Input impedance of MSDA depends on its with geometrical shape, dimension and the feed type. Therefore antenna input impedance is an important design parameter which controls the radiated power and the impedance bandwidth. In most application, bandwidth limitations occur due to an impedance mismatch. In the respect micro strip antenna have narrow bandwidth because of heavy reactance. As micro strip antennas have found wide variety of application areas, a number of techniques are evolved to improve its limited bandwidth. A straight forward application to improve the bandwidth is increasing the thickness of substrate supporting the micro strip patch. However limitation shall exist on the ability to effectively feed the patch on a thick substrate and the radiation efficiency can degrade with increasing substrate thickness. Techniques for overcoming this band limiting problems can be achieved by using parasitic terms elements, external matching and separating the feed and antenna. Proximity coupling method uses an impedance matching stub connected to the feed line achieving 13% bandwidth. A broadband rectangular patch antenna with a pair of vide slits at near the resonance frequency improves to 24% bandwidth. Bandwidth of 10-12% can be obtained using passive coplanar matching network. Impedance bandwidth of 60% was achieved using the L and T slots in the micro strip slot antenna, however gain and radiation pattern are distorted. Using aperture coupled antenna BW large than 20% and cross polarization level lower than -30 db can be achieved. Bandwidth of circular loop antenna can be significantly increased when one more parasitic loop in added.