The actuation of the fabricated probe is examined, and the optical modulation of an incident laser light is demonstrated. In addition, the far-field radiation pattern of the bowtie antenna is measured, and it shows dipole-like characteristics with large beamwidth. In this method the size of the antenna is reduced. Microstrip and parallel-strip transmission lines printed on the substrate with high dielectric permittivity realize the proposed feeding network. The application of this designed antenna is in wide band communication. A broad band printed bow-tie antenna with a simplified feeding mechanism is proposed.
The theoretical resonant-frequency results obtained from the magnetic wall cavity model with this new effective side length and effective relative dielectric constant expressions are in very good agreement with experimental results available in the literature. The characteristic impedance of a bow-tie antenna is given by Rahim et al. Using this simple method, by making variation of the single dimension of the antenna structure, the bandwidth is improved by 21% and return loss S11 is also improved of whole of the band of interest. In its most fundamental form, a Microstrip Patch antenna consists of a radiating patch on one side of a dielectric substrate which has a ground plane on the other side as shown in Figure 2. There are some methods such as increasing the height of the substrate, which can be used to extend the efficiency and bandwidth. This antenna can be used for Ultra Wide Band applications. Optimization value of the length is needed to make the frequency resonance at 2.
Length of Slot is 5 mm and width of slot is 3 mm. This paper described the design and fabrication of the fractal Sierpenksi carpet monopole antenna. In this communication design and performance of a novel rectangular with finite ground is proposed to achieve wide band performance and circular polarization. This printed bow-tie antenna achieves a 68% measured bandwidth and a stable radiation pattern within the X-band. This is particularly due to their main characteristics such as low volume and weight, as well as because they are easy to fabricate and to be installed on plane and curved surfaces. You may be tempted to think that the shorting pin would zero out any power delivered to the antenna. However, the fringing fields which are responsible for radiation are shorted on the far end, so only the fields nearest the transmission line radiate.
The modified antenna can use in wide band applications of wireless communication. In this manner, the resonant frequency can be altered. Its geometry is arranged such that the two dipole arms are on opposite sides of a dielectric substrate, fed by a microstrip line. There are some methods such as increasing the height of the substrate, which can be used to extend the efficiency and bandwidth. By varing the flare angle as shown in Fig.
We are unable to show you the full-text html version of this article because your Internet Explorer is seriously out of date. Length of defected ground plane is 30 mm and width of defected ground plane is 60 mm. Different variants of Bow-tie antenna with improved antenna performances i. Also the gain of modified antenna has been increased up to 4 dBi. This disturbance will change characteristics of a transmission line such as line capacitance and inductance. The numerical results obtained are in good agreement with the experimental data. One method used in patch antenna design is to introduce shorting pins from the patch to the ground plane at various locations.
Did you know that your Internet Explorer is out of date? The pattern symmetry and cross-polarization of the antenna are improved by slightly changing the arms length. In this research work a resistively loaded compact Bow-tie antenna which can operate through a wide bandwidth of 4. The ground-plane transition between the microstrip line and the parallel-strip line is exponentially tapered so as to reduce the reflection losses and produce a balanced feed for the antenna. The phone has 6 antennas, as shown in Figure 7. Geometry parameters and substrate material also features relevant electromagnetic properties as Effective Permittivity ε ff and Characteristic Impedance Z 0 of antenna. The simulated resonant frequencies at different arm lengths and flare angles are shown in Fig. The optimized, resistive bow-tie antenna is shown to radiate a pulse that more closely resembles that of the excitation than is radiated by a metallic bow tie of comparable size.
A sample of the proposed antenna was built and experimentally validated, showing a good agreement with the simulation results. All other parameters of Antenna2 structure are same as Antenna1. This paper discusses the design and simulation of microstrip dipole antenna at 2. It can also control the excitation and electromagnetic waves propagating through the substrate layer. The properties of antennas such as bandwidth and radiation pattern have been investigated. Because the patch is shorted at the end, the current at the end of the patch antenna is no longer forced to be zero.
Equivalent Circuit of antenna in Figure 2. The numerical results obtained are in good agreement with the experimental data. In this letter, we design, fabricate, and characterize a modified gold bowtie antenna integrated on a transparent silica substrate. The Planar Inverted-F Antenna is popular because it has a low profile and an omnidirectional pattern. Considering the simulation results the most satisfactory antenna configuration was obtained and implemented.
The solution is obtained numerically by means of the method of moments. This introduces another design parameter to optimize performance. The feed antenna offers an impedance bandwidth of 16. . By varying its flare angle, a wire bow-tie antenna can be optimized to provide one of three aspects: minimal reflection at its terminal, maximal transmitted field strength in the ground, or an optimal size of antenna footprint. The gap spacing of the bow-tie antenna can be adjusted by the electrostatic actuator, which offers both the small spot size of the optical near-field and the high transmission efficiency.