scholarly journals Tunable H-Shaped Microstrip Antenna with Dual Feeding

2017 ◽  
Vol 2017 ◽  
pp. 1-6 ◽  
Author(s):  
Ayman S. Al-Zayed ◽  
Mohammed A. Kourah ◽  
Samir F. Mahmoud
Keyword(s):  
Microstrip Antenna ◽  
Dual Band ◽  
Cross Polarization ◽  
Tunable Range ◽  
Varactor Diodes ◽  
Tuning Ratio ◽  
Coaxial Probes ◽  
Second Mode ◽  
Linearly Polarized ◽  
Simulation Results

The design of a frequency reconfigurable dual-band H-shaped microstrip antenna fed by two coaxial probes is presented. Each probe excites one of the two fundamental modes of the antenna which are linearly polarized and orthogonal to each other. The antenna is symmetrically loaded with four varactor diodes to simultaneously tune these two modes. Simulation results show that the tunable range of the first mode is between 1.69 and 2.19 GHz (1.3 : 1 tuning ratio), whereas it is between 1.94 and 2.72 GHz (1.4 : 1 tuning ratio) for the second mode. In the range between 1.94 and 2.19 GHz, the radiation of the proposed antenna can be switched between two orthogonal linear polarizations by a simple adjustment to the capacitance of the varactor diodes. The proposed antenna achieves a good performance in terms of port-to-port isolation, directivity, and cross-polarization.

A compact polarization reconfigurable stacked microstrip antenna for WiMAX application

2020 ◽  
pp. 1-16
Author(s):  
Murari Shaw ◽  
Niranjan Mandal ◽  
Malay Gangopadhyay
Keyword(s):  
Microstrip Antenna ◽  
Impedance Matching ◽  
Axial Ratio ◽  
Dual Band ◽  
Impedance Bandwidth ◽  
Circularly Polarized ◽  
Rectangular Slot ◽  
Substrate Layer ◽  
Linearly Polarized ◽  
Coaxial Probe

Abstract In this paper, a stacked microstrip patch antenna with polarization reconfigurable property has been proposed for worldwide interoperability for microwave access (WiMAX) application. The proposed antenna has two substrate layers: upper and lower layers with two radiating patches connected with the coaxial probe. Without the upper layer the lower square-shaped substrate layer having regular hexagonal radiating patch with probe fed acts as a linear polarized antenna with impedance bandwidth for (S11 ≤ −10 dB) is 370 MHz 10.56% (3.32–3.69 GHz) cover WiMAX (3.4–3.69 GHz) application band. The hexagonal radiating patch is perturbed with an optimum rectangular slot to enhance the impedance bandwidth of the antenna. The lower substrate layer having hexagonal patch with the same probe position is stacked with the upper square-shaped substrate layer with same sized square patch and the upper patch soldered with the coaxial probe. The overall stacked antenna generates a circularly polarized band when the opposite corner of the top square radiating patch of the upper layer is truncated with optimum size. In order to generate another circularly polarized band and to improve the input impedance matching of the stacked antenna, the top radiating patch is perturbed with two slots and a slit. The stacked circularly polarized antenna generates impedance bandwidth of 12.75% (3.23–3.67 GHz) for (S11 ≤ −10 dB) with two circularly polarized bands (3.34–3.37 GHz) and (3.66–3.70 GHz) as per (axial ratio ≤ 3 dB) for WiMAX application. Therefore, the proposed antenna can be used as linearly polarized or dual band circularly polarized according to requirement.

scholarly journals Analysis and Design of Cavity-Backed Probe-Fed Hybrid Microstrip Antennas on FR4 Substrate

2015 ◽  
Vol 2015 ◽  
pp. 1-12 ◽  
Author(s):  
D. C. Nascimento ◽  
Prêntice C. Ribeiro Filho ◽  
Alexis F. Tinoco-S ◽  
J. C. da S. Lacava
Keyword(s):  
Microstrip Antenna ◽  
Mutual Coupling ◽  
Low Cost ◽  
Microstrip Antennas ◽  
Substrate Integrated Waveguide ◽  
Cross Polarization ◽  
Analysis And Design ◽  
Linearly Polarized

A novel cavity-backed probe-fed linearly polarized microstrip antenna based on the concept of hybrid radiators is proposed and implemented. The resulting flush-mounted antenna exhibits symmetrical bandwidth, low cross-polarization radiation in theH-plane, due to its hybrid patch, and low cost, since it can be built on a FR4 laminate. Substrate integrated waveguide technology is used in the fabrication of the metallic cavity. The effect of mutual coupling is analyzed for two classical arrangements: the side-by-side and the collinear configurations.

scholarly journals A Millimeter Wave Antenna using Slots for Defense Applications

2018 ◽  
Vol 7 (2.11) ◽  
pp. 36
Author(s):  
Deepa Negi ◽  
Rajesh Khanna
Keyword(s):  
Millimeter Wave ◽  
Microstrip Antenna ◽  
Return Loss ◽  
Simulation Software ◽  
Dual Band ◽  
Strip Line ◽  
Wave Antenna ◽  
Feeding Technique ◽  
Millimeter Wave Antenna ◽  
Simulation Results

In this paper, a rectangular dual band millimeter wave (MMW) microstrip antenna using U and circular slot is designed for defense applications. The antenna operates in the (57-64) GHz unlicensed frequency band. The proposed antenna is designed using RT/duroid substrate having dielectric constant 2.3, thickness 0.04mm and strip line feeding technique. The proposed antenna results are simulated and optimized using Computer Simulation Technology (CST) simulation software. The maximum return loss achieved is -15dB and -25.45 dB respectively for both U and circular slot. Simulation results show that the antenna having circular slot gave better results. The antenna simulation results such as return loss, gain and directivity are presented in this paper. 

scholarly journals Dual-Band Transmissive Cross-Polarization Converter with Extremely High Polarization Conversion Ratio Using Transmitarray

Materials ◽  
2019 ◽  
Vol 12 (11) ◽  
pp. 1827 ◽  
Author(s):  
Jianxing Li ◽  
Jialin Feng ◽  
Bo Li ◽  
Hongyu Shi ◽  
Anxue Zhang ◽  
...  
Keyword(s):  
Cell Structure ◽  
Conversion Ratio ◽  
Transmitted Wave ◽  
Dual Band ◽  
Polarization Conversion ◽  
Cross Polarization ◽  
Polarization Converter ◽  
Linearly Polarized ◽  
The Cross ◽  
Incident Waves

In this paper, a dual-band cross-polarization converter is proposed. The proposed device can convert linearly polarized incident waves to their cross-polarized transmitted waves. Inspired by the aperture coupled transmitarray, a transmissive multi-layered unit cell structure was designed, which can operate in two frequency bands. The designed structure can manipulate the polarization of the transmitted wave into the cross-polarization of the incident waves at 10.36 GHz and 11.62 GHz. The cross-polarized transmittance of the proposed cross-polarization converter is higher than 0.93. In addition, the transmitted wave has an extremely low co-polarized component, which results in a nearly 100% polarization conversion ratio. The two working frequencies can be tuned independently. The proposed cross-polarization converter was simulated, fabricated and measured. The simulation results confirm with the measurement results.

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