Second iteration fractal Koch planar log periodic antenna design

2011 ◽  
Vol 53 (8) ◽  
pp. 1869-1875 ◽  
Author(s):  
M. K. A. Rahim ◽  
M. N. A. Karim ◽  
F. Zubir ◽  
O. Ayop ◽  
N. A. Samsuri
Keyword(s):  
Antenna Design ◽  
Log Periodic Antenna

scholarly journals Optimization of Log-Periodic TV Reception Antenna with UHF Mobile Communications Band Rejection

Electronics ◽  
2020 ◽  
Vol 9 (11) ◽  
pp. 1830
Author(s):  
Keyur K. Mistry ◽  
Pavlos I. Lazaridis ◽  
Zaharias D. Zaharis ◽  
Ioannis P. Chochliouros ◽  
Tian Hong Loh ◽  
...  
Keyword(s):  
Quality Of Service ◽  
Mobile Communications ◽  
Lower Cost ◽  
Mobile Services ◽  
Poor Quality ◽  
Antenna Design ◽  
Log Periodic Antenna ◽  
4G Lte ◽  
Tv Broadcasting

The coexistence of TV broadcasting and mobile services causes interference that leads to poor quality-of-service for TV consumers. Solutions usually found in the market involve external band-stop filters along with TV reception log-periodic and Yagi-Uda antennas. This paper presents a log-periodic antenna design without additional filtering that serves as a lower cost alternative to avoid interference from mobile services into the UHF TV. The proposed antenna operates in the UHF TV band (470–790 MHz-passband) and rejects the 800 MHz and 900 MHz bands (stopband) of 4G/LTE-800 and GSM900 services, respectively. Matching to 50 Ohms is very satisfactory in the passband with values of S11 below −12 dB. Furthermore, the antenna is highly directive with a realized gain of approximately 8 dBi and a front-to-back ratio greater than 20 dB.

scholarly journals Exponential Log-Periodic Antenna Design Using Improved Particle Swarm Optimization With Velocity Mutation

2017 ◽  
Vol 53 (6) ◽  
pp. 1-4 ◽  
Author(s):  
Zaharias D. Zaharis ◽  
Ioannis P. Gravas ◽  
Traianos V. Yioultsis ◽  
Pavlos I. Lazaridis ◽  
Ian A. Glover ◽  
...  
Keyword(s):  
Particle Swarm Optimization ◽  
Particle Swarm ◽  
Antenna Design ◽  
Swarm Optimization ◽  
Improved Particle Swarm Optimization ◽  
Log Periodic Antenna ◽  
Velocity Mutation

scholarly journals A Multiband Biconical Log-periodic Antenna for Swarm Communications

2019 ◽  
Vol 3 (2) ◽  
pp. 85-91
Author(s):  
Bessam Al Jewad
Keyword(s):  
Unmanned Aerial Vehicles ◽  
Degree Of Freedom ◽  
Antenna Design ◽  
Field Pattern ◽  
Multiband Antenna ◽  
Single Antenna ◽  
Aerial Vehicles ◽  
Sufficient Degree ◽  
Log Periodic Antenna ◽  
Antenna Impedance

In this paper, we present a specific multiband antenna design that addresses the problem of communication with unmanned aerial vehicles (UAVs). We consider a scenario where multiband single-antenna UAV communicates with the rest of the swarm members that are equipped with similar antennas. The key point in the design is that the communication does not require high or low elevation angles in most of the cases. The suggested design has a sufficient degree of freedom to select the desired features for the field pattern while keeping other features such as antenna impedance and gain relatively stable or at least in the acceptable operation region.

scholarly journals UWB Single Port Log Periodic Toothed Terahertz Antenna Design Based on Graphene Artificial Magnetic Conductor

2017 ◽  
Vol 11 (3) ◽  
pp. 86 ◽  
Author(s):  
Hussein A. Abdulnabi ◽  
Refat T. Hussein ◽  
Raad S. Fyath
Keyword(s):  
Chemical Potential ◽  
Single Port ◽  
Impedance Matching ◽  
Ultra Wideband ◽  
Antenna Design ◽  
Frequency Range ◽  
Magnetic Conductor ◽  
Dc Voltage ◽  
Artificial Magnetic Conductor ◽  
Log Periodic Antenna

In this work, a single port exponential tapered toothed log periodic antenna based on graphene artificial magnetic conductor (AMC) is suggested for ultra-wideband (1–10) THz operation. The resonance frequency of the proposed antenna can be tuned by changing the connected DC voltage which leads to variation in the chemical potential of the graphene.The radiating toothed log periodic antenna consists of gold patch placed on 25x25 graphene patches which act as an AMC surface unit. Exponential taper is used to satisfy impedance matching between the antenna and the feeder over the frequency range. The simulation results reveal that 90% of frequency range satisfies when the chemical potential is1eV.

scholarly journals The Simulation and Experiment of a Non-Cross-Feeding Printed Log-Periodic Antenna

2015 ◽  
Vol 2015 ◽  
pp. 1-8 ◽  
Author(s):  
Chun-Ying Kang ◽  
Shu Lin ◽  
Zhi-Hua Zhao ◽  
Li-Wen Jing
Keyword(s):  
Radiation Pattern ◽  
Coaxial Line ◽  
Antenna Design ◽  
Wideband Antenna ◽  
Feeding Structure ◽  
Simulation And Experiment ◽  
Log Periodic Antenna ◽  
Simulation Results ◽  
Antenna Model ◽  
Cst Microwave Studio

A non-cross-fed printed log-periodic antenna is simulated and studied experimentally. To avoid complex feeding with long coaxial line, the non-cross-feeding structure is applied in this antenna. The software CST Microwave Studio is employed to simulate the proposed antenna, and the optimized antenna model is obtained. According to the simulation results, the antenna prototype is produced and measured. Simulation and measured results show that the antenna is withS11<-10 dB in band of 4.2–9.2 GHz. And the radiation pattern and gain vary steadily in this band, which achieves requirements for wideband antenna. This antenna design can be extended to the design of the antenna integrated in communication circuit.

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