An Accurate Circuit Model for Input Impedance and Radiation Pattern of Two-Port Loop Antennas as E- and H-Probe

2017 ◽  
Vol 65 (1) ◽  
pp. 114-120 ◽  
Author(s):  
Mani Kashanianfard ◽  
Kamal Sarabandi
Keyword(s):  
Radiation Pattern ◽  
Input Impedance ◽  
Circuit Model ◽  
Loop Antennas

Miniaturization of Printed Microstrip Antennas Array by Using Defected Ground Structure Technique

2019 ◽  
pp. 101-146
Author(s):  
Otman Oulhaj ◽  
Amar Touhami Naima ◽  
Aghoutante Mohamed
Keyword(s):  
Computer Simulation ◽  
Radiation Pattern ◽  
Pattern Matching ◽  
Input Impedance ◽  
Microstrip Antennas ◽  
Design System ◽  
Theoretical Studies ◽  
Defected Ground Structure ◽  
Planar Antennas ◽  
Miniature Antennas

In this chapter, the authors present different techniques used to miniature microstrip antennas, particularly planar antennas array, for different applications demanding small dimensions. This will cover DGS, slot technique, and metamaterials. After the presentation of these techniques based on theoretical studies, the second part of this chapter will be about the authors' contribution in the miniaturization of microstrip antennas arrays. This part will include the presentation of some miniature antennas array which they have validated into simulation and measurement by using DGS techniques. The different structures were validated into simulation by using tow electromagnetic solvers ADS (advanced design system) and CST-MW (computer simulation technology) which permit one to validate and to verify the different performances of antennas arrays as radiation pattern, matching input impedance and small dimensions.

Calculation of the radiation pattern, gain and input impedance of a Yagi antenna

1975 ◽  
Vol 11 (13) ◽  
pp. 282
Author(s):  
P.S. Hall ◽  
B. Chambers ◽  
P.A. Mcinnes
Keyword(s):  
Radiation Pattern ◽  
Input Impedance ◽  
Yagi Antenna

scholarly journals A Compact Size 4–19.1 GHz Heart Shape UWB Antenna with Triangular Patches

2013 ◽  
Vol 2013 ◽  
pp. 1-6 ◽  
Author(s):  
Gokmen Isik ◽  
Serkan Topaloglu
Keyword(s):  
Radiation Pattern ◽  
Input Impedance ◽  
Patch Antennas ◽  
Frequency Range ◽  
Uwb Antenna ◽  
Radiation Characteristics ◽  
Narrow Bandwidth ◽  
Compact Size ◽  
Uwb Applications

An ultrawideband antenna is designed, simulated, and realized. To overcome the narrow bandwidth characteristics of basic patch antennas, the structure of the radiation pattern is optimized by the aid of elliptical and rectangular patches. Also triangular patches are applied to the antenna edge in order to enhance the VSWR and gain properties. A typical VSWR of 1.5 (less than 2 in the whole frequency range) and a typical gain of 2 dBi (mainly above 1 dBi in the whole frequency range) are observed. The simulations present that the designed antenna has a bandwidth ratio of ~5 : 1 within the frequency range of 4–19.1 GHz with compact dimensions of 25 × 26 mm2. It is fabricated on a 0.5 mm thick, RO3035 substrate. The input impedance, gain, and radiation characteristics of the antenna are also presented. With these properties, it is verified that, with its novel shape, the proposed antenna can be used for various UWB applications.

scholarly journals Design of Compact Tri-Band Fractal Antenna for RFID Readers

2017 ◽  
Vol 7 (4) ◽  
pp. 2036 ◽  
Author(s):  
Mohamed Ihamji ◽  
Elhassane Abdelmounim ◽  
Hamid Bennis ◽  
Mostafa Hefnawi ◽  
Mohamed Latrach
Keyword(s):  
Radio Frequency ◽  
Radiation Pattern ◽  
Radio Frequency Identification ◽  
Input Impedance ◽  
Microstrip Antenna ◽  
Ground Plane ◽  
Physical Parameters ◽  
Fractal Antenna ◽  
Frequency Identification ◽  
Rectangular Microstrip Antenna

In this paper, a multiband and miniature rectangular microstrip antenna is designed and analyzed for Radio Frequency Identification (RFID) reader applications. The miniaturization is achieved using fractal technique and the physical parameters of the structure as well as its ground plane are optimized using CST Microwave Studio. The total area of the final structure is 71.6 x 94 mm<sup>2</sup>. The results show that the proposed antenna has good matching input impedance with a stable radiation pattern at 915 MHz, 2.45 GHz, and 5.8 GHz.

scholarly journals Broadband Dipole-Loop Combined Nanoantenna Fed by Two-Wire Optical Transmission Line

2017 ◽  
Vol 2017 ◽  
pp. 1-13 ◽  
Author(s):  
Janilson L. de Souza ◽  
Karlo Q. da Costa ◽  
Victor Dmitriev ◽  
Felipe Bamberg
Keyword(s):  
Reflection Coefficient ◽  
Transmission Line ◽  
Radiation Pattern ◽  
Method Of Moments ◽  
Input Impedance ◽  
Optical Transmission ◽  
Near Field ◽  
Impedance Matching ◽  
Linear Method ◽  
Geometrical Parameters

This paper presents a broadband nanoantenna fed by a two-wire optical transmission line (OTL). The antenna is defined by a combination of a dipole and a loop, where only the dipole element is connected to the OTL. The analysis is fulfilled by the linear method of moments with equivalent surface impedance to model the conductors. Firstly, the nanoantenna alone is investigated, where the input impedance, current distribution, reflection coefficient, fractional bandwidth, radiation efficiency, and radiation pattern are analyzed. Then, the input impedance matching of this antenna with the OTL is considered. In this case the current, near field distribution, radiation pattern, and reflection coefficient are calculated for different geometrical parameters. The results show that the loop inserted in the circuit can increase the bandwidth up to 42% and decreases the reflection coefficient in the OTL to −25 dB.

Sign in / Sign up

Export Citation Format

Share Document