دانلود رایگان مقاله آنتن دو قطبی امپدانس قابل پیکربندی مجدد فرکانسی برای کاربردهای بی سیم – سال 2020
مشخصات مقاله:
عنوان فارسی مقاله:
آنتن دو قطبی امپدانس قابل پیکربندی مجدد فرکانسی برای کاربردهای بی سیم
عنوان انگلیسی مقاله:
Frequency reconfigurable stepped impedance dipole antenna for wireless applications
کلمات کلیدی مقاله:
آنتن دو قطبی، آنتن قابل تنظیم فرکانس، امپدانس پله، وراکتور، دیود، WLAN
مناسب برای رشته های دانشگاهی زیر:
مهندسی برق
مناسب برای گرایش های دانشگاهی زیر:
برق مخابرات
وضعیت مقاله انگلیسی و ترجمه:
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فهرست مطالب:
Abstract
Keywords
1. Introduction
2. Design and geometry of the antenna
3. Results and discussion
4. Conclusion
Declaration of Competing Interest
Acknowledgement
References
قسمتی از مقاله انگلیسی:
1 | INTRODUCTION
There has been an increasing demand for compact reconfigurable antennas in modern wireless communication systems, because of its superior features such as reconfigurable capability, multipurpose operation, low cost with an added advantage of miniaturization. Generally, reconfigurability can be applied to the resonant frequency, the direction of the main beam, beamwidth, and polarization [1-5]. By changing the effective length of the radiator, the antenna resonance frequency can be reconfigured. This concept of reconfigurability can be achieved by using either the microelectromechanical switches (MEMS) or solid-state devices, usually positive-intrinsic-negative (PIN) diodes and varactor diodes [6-11]. A stepped impedance-based reconfigurable filter is presented in [12], which uses four PIN diodes as switching elements. Stepped impedance dipole antennas are reported in [13, 14]. The pattern reconfigurable parasitic antenna using a pin diode is demonstrated in [15]. The integration of varactor diode along with the printed monopole antenna results in the frequency reconfigurability [16]. Variable chip capacitors are also used to control the antenna resonant frequency [17]. In the previously published articles, the technique presented to achieve frequency reconfigurability is more complicated [18], [19], and difficult to achieve in practical scenarios. The air gap between the substrate and ground plane is utilized to lower the effective permittivity of the antenna. For the proper tuning of the antenna resonant frequency, the thickness of the air gap should be trimmed. These require an additional mechanical system to adjust the air gap between substrate and ground plane for frequency reconfigurability, which is a very difficult task in practice. This mechanical adjusting system will also affect the antenna performance, such as bandwidth, gain, and size of the antenna
