Papers by Keyword: Microstrip

Abstract: In this paper, a microstrip line-fed rectangular-shaped ultra-wideband (UWB) antenna offering triple-band notch characteristics is proposed. The notching was done primarily to provide rejection for Wi-Max (3.3-3.7 GHz), WLAN2 (5.15-5.825 GHz), and ITU (8.025-8.4 GHz) through the combination of slots and a modified electromagnetic band gap (M-EBG). The antenna was simulated using HFSS and CST modelling tools. The antenna was able to notch three frequencies from narrow band communication systems (Wi-Max, WLAN2, and ITU), causing interference within the UWB band. The gain of the system over the operating frequency, the current distributions, and the impedance covered were studied to assess the effectiveness of the antenna. The proposed antenna is simple and compact, with a total antenna size of 19 mm by 24 mm and a wide bandwidth (3.2 to 12.5 GHz). Satisfactory results have been obtained when its performance was analyzed. A stable radiation characteristic is observed with a radiation efficiency of 94% when operating at a UWB resonant frequency of 6.85 GHz with a total gain between -10 dB and 5 dB within the range of the frequency band of 3.2 to 12.3 GHz.

Abstract: Microstrip ring resonator (MRR) sensor was modeled by simple equivalent lumped element circuits in free space based on simulation data obtained from Microwave Office (AWR) simulator and comparison was made with the measurements using the E5071C Network Analyzer. The calculated reflection coefficient, |G| and complex input impedance Z_in using lumped element model were compared with the measurements results. Both results showed well agreement with a little discrepancy, basically due to imperfect soldering. The MRR was designed to have operating frequencies between 0.5 GHz and 4.5 GHz. The maximum surrounding of magnetic field, H_ϕ is within 15 A/m in free space.

Abstract: The feeding network of the microstrip array antenna often can not meet the requirements accurately of the theory. In this paper, we use a series network to feed the radiating elements of the array antenna and set a zero point on a given direction. Comparing with the ordinary feeding array, it can effectively reduce the gain level of the certain side lope. A planar microstrip patch array antenna which works at 35.75GHz is designed. The simulation result shows that this antenna array has a gain of 22dB and a very low side lope at certain direction.

Abstract: A single array element circularly polarized microstrip patch antenna is analyzed based on the theory of cavity mode. Through studying the design of circularly polarized microstrip antenna array, a 96 elements circularly polarized microstrip antenna array is designed and it is optimized by using the Ansoft's HFSS software. After testing of the antenna, we can see that it provides a gain of 22.6dB and has a good axial ratio.

Abstract: In this paper, a linearly polarized microstrip patch array antenna is analyzed based on the theory of cavity mode. Using the weighted parallel fed method, a 64 element linear polarization microstrip array antenna with a 35.5GHz center frequency is designed. Then we use the simulation software optimize the simulation model of the antenna. The simulation result shows that this antenna has a gain of 22dB, and low sidelobes.

Abstract: It is very difficult to accurately analyze the performance of the antenna conformed to the elastomer because of the complex structure. Conformal coordinate method is an effective method for analyzing the complex structure of the antenna. Based on the conformal coordinate method, the millimeter-wave monolithic conformal microstrip antenna is analyzed in this paper. Using the traditional way of microstrip-fed - the middle microstrip feeding, we design the microstrip patch unit. Then we use the HFSS to simulate the antenna.

Abstract: This paper analyzes the basic theory of the microstrip narrow-band filter design and accomplishes the design of narrow band-pass filter whose center frequency is on L-band with the help of the Agilent ADS simulation software. The filter adopts Chebyshev’s prototype structure and consists of coupled microstrip line. Its fluctuation is less than 0.5dB and attenuation is less than 1.5dB between 1.9GHZ and 2.1GHZ .Its port Reflection coefficient less than-15dB and attenuation is greater than 20dB at 1.72GHZ and 2.3GHZ. Layout simulation meets the requirement of filter design.

Abstract: The deployment of the wireless technology since FCC regulated the UWB technology spectrum was going rapidly. The wireless system that supports UWB, especially the antenna as the transducer should be UWB supported beside the other existed wireless technology, ease to fabricate and low cost. Not only that, The antenna performance should be has circular polarization to reduce misalignment. With the dimension of 60 x 60 mm made from FR-4 epoxy 0.8 mm thickness, and L-shape for the feedline with the star shape as the patch, the microstrip antenna can work at the frequency of 2 up to 9.8 GHz and has circular polarization in the frequency range of 2 up to 3.3 GHz.

Abstract: The microstrip circuit is mostly analyzed in transform domain, because its equivalent circuit equation is often nonlinear differential equation, which is easily analyzed in transform domain relatively, but hardly did in time domain, so the analysis of microstrip circuit is a hard work in time domain. In this paper, the FDTD method is used to analyze the microstrip circuit in time domain, by transforming the nonlinear differential equation into time domain iterative equation, selecting suitable time step, and having an iterative computing, the time domain numerical solution can be solved. The FDTD method analyzing the microstrip circuit provides a new way of thought for analyzing microstrip circuit in time domain.

Abstract: A two-way symmetrical modified Wilkinson power divider with shifted output ports and wide range frequency-ratio is proposed for dual-band application. The symmetrical Wilkinson power divider consists of one section coupled line, one section microstrip line, the shifting of two output ports to the middle, two open stubs at the input port and an isolation resistor. The corresponding nonlinear design equations are derived by using the even- and odd-mode analysis. Moreover, solving the nonlinear design equations by optimization algorithms, accurate numerical design parameters along with different frequency ratios are obtained. Finally, the proposed structure and design method are validated by simulation and experimental results of microstrip planar Wilkinson power divider.