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The study presents an investigation of the effects of a single, or multiple circular shaped slot (cut) can be used to improve the performance of a simple patch antenna operating in Wireless Local Area Network (WLAN) frequencies (2.4 Ghz). The design is achieved by cutting single or multiple circular slots at the radiating element of the patch antenna. The effects of different circular slots orientations...
This paper presented a method of quantifying blood glucose level using pocket vector network analyzer by measuring the skin S-11 figure of merits or parameters. The researcher uses a spiral microstrip antenna, a pocket vector network analyzer, and an SAS JMP statistical tool. Two female subjects with different ages, have 20kgs difference in weight, a body mass index difference of 4.78 and have a difference...
A miniaturized independently tuning dual-band multi-mode antenna using postwall slotline (PWS) is proposed and simulated in this work. The antenna consists a stepped impedance slot and a patch on the other side of the substrate, and the patch is attached at the edge of the slot by shorting pins. The stepped impedance slot based on the postwall slotline is actually a dual-mode slotline antenna working...
An isosceles right Triangular Microstrip Antenna (TMA) is investigated here for triple band application. Simple cavity model theory is used to investigate the isosceles 45°–45°–90° TMA. Two different isosceles 45°–45°–90° TMAs are demonstrated for triple band dual polarized antenna. Finite Element Method (FEM) based commercially available numerical 3D EM simulator HFSS is also used here to verify...
A L-shaped defective ground structure (i.e. DGS) is implemented in the ground surface and length of the DGS is revised accordingly to achieve the lower application frequency bands viz. GSM band, Bluetooth band and WiMax band respectively. As a consequence, frequency tunable characteristics with optimal bandwidth and gain is observed in the application frequency bands for proposed antenna.
A Cuboid Dielectric Resonator Antenna fed by microstrip feed line is studied. The dielectric resonator of the antenna is made by a material with high dielectric constant ∊r=30. The impedance matching of dielectric resonator can be improved by using a # slot in the ground. In additional, a two elements array is used to enhance the performance of the antenna. This proposed antenna is suitable for long-term...
A planar microstrip-fed wideband circularly polarized antenna has been designed and investigated in this paper. First, a wideband linearly polarized antenna consisting of a rectangular ground plane and a rectangular radiating patch has been designed. To improve the impedance matching across a wide frequency range, the feeding line is formed of a 50Ω microstrip line and a tapered impedance transformer...
A probe-fed stacked U-slot patch antenna for satellite applications is presented. The impedance bandwidth (VSWR≤1.5) of 7.7% is achieved at the designed frequency fo. The simulated peak realized gain of the proposed antenna is about 9 dBi.
This paper presents the results of the analysis of induced voltages and wave reflections in a 4G LTE communication module. By employing electromagnetic compatibility (EMC) criteria applied to printed circuit boards (PCB), it has been possible to reduce the voltage levels estimated in the pre-design up to 10 times. This work also presents an analysis of the times reached in the rising and falling edges...
A novel parallel-coupled microstrip feed line is proposed. The feed relies on the capacitance contribution arising from the capacitances occurring at adjacent split sections in order to lower the high intrinsic input impedance common to microstrip patch antennas. It is expected that the capacitance contribution will enhance the frequency pattern of the microstrip passive and thus overcome the narrow...
In this paper, an analysis of the Fat Patch Antenna with the extraordinary parasitic patch is described. For the numerical simulations, the Full Wave — CST Microwave Studio software is used. The element of the antenna is fed by the L-probe partially implemented in PCB. An excellent impedance matching is obtained (< −26 dB in the design frequency band 4.4–5 GHz). The radiation characteristics are...
In this paper triangular microstrip antenna with a novel defective ground structure are proposed. Without the defective ground structure (DGS) the structures are found to be resonant at 5.2 GHz. When the DGS are introduced a frequency shift of 5.2 GHz to 1.8 GHz is observed. The main essence of this paper is the miniaturization of the antenna.
Tilting of broadside radiation pattern of microstrip antenna array is obtained by loading SRR on the ground plane between antenna elements. Progressive Phase Shift method is used here. The phase delay generated by single SRR is around 500 when compared to a reference transmission line. The beam scanning is found to be 280 with central frequency of 10 GHz and gain of 11.18 dB.
Triangular patch antennas have a serious limitation of their few numbers of radiating modes. In this research, a triangular patch Antenna with (30°-60°-90°) angles is studied to find the maximum number of radiating modes using a coaxial probe at different points of the said antenna. The design investigation on the triangular patch antenna is presented at 1 GHz to 6.5 GHz frequency range. Using HFSS...
A low-cost, high gain and broadband 30 GHz quasi_Yagi antenna with a corrugated substrate is presented. The corrugation design parameters provide a high flexibility to enhance antenna characteristics. The proposed antenna provides a gain of 17.7 dB at 30 GHz, a high total radiation efficiency of ∼94.4%, an impedance bandwidth covers the 24–31.6 GHz band and in-band crosspolarization of less than 37...
This paper proposes a new feeding scheme for exciting a higher-order resonant mode in cylindrical dielectric resonator antennas. The proposed feeding structure comprises a nonresonant microstrip patch connected to a narrow microstrip line by means of an inset. Both the microstrip patch and line are located under the antenna radiating element (dielectric resonator). A parametric analysis of this feeding...
Design of microstrip antenna arrays using dissimilar circular patch elements is presented in this paper to cover the band 2.400–2.483 GHz required in IEEE802.11b,g applications. The following antenna prototypes were designed and built: circular patch antenna, 1×2 and 1×4 arrays. Proposed arrays presented an impedance bandwidth above to 100 MHz and 1×4 array synthetizes a broadside radiation pattern...
This paper explains why antennas can achieve limited frequency tunability by mounting varactor diodes across slots. The reason is that majority of varactors have a resistance in parallel to the variable capacitor. Resistance mainly acts as a short and thereby the varactor loses its capacitive behavior at low frequencies ∼ 2 GHz. At higher frequencies, the varactor retains its capacitive effect. Simulations...
This paper presents a low profile unidirectional UWB cavity backed antenna analyzed using The Theory of Characteristics Modes (TCM). The main goal of this work is to design a low profile UWB antenna with a very stable and unidirectional radiation pattern. The proposed design is based on exciting the fundamental mode of a cavity structure composed of a metallic ring, a circular waveguide and two circular...
In this paper a stacked modified Sierpinski's gasket fractal antenna is presented to achieve dual band behavior and wide bandwidth for satellite down link and uplink application in C-band D/L 4Ghz (3.82Ghz-4.38Ghz) and U/L 6Ghz (5.92Ghz-6.19Ghz) bands respectively. It is designed with proximity feeding technique using FR4 (∊r=4.4) substrate and height of the substrate h=1.6mm. Based on self similar...
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