scholarly journals A Planar Inverted Feed Antenna for WiMAX and GPS Applications

2019 ◽  
Vol 8 (6S3) ◽  
pp. 1242-1244
Keyword(s):  
Global Positioning System ◽  
Patch Antenna ◽  
High Frequency ◽  
First Century ◽  
Positioning System ◽  
Defected Ground Structure ◽  
Ground Structure ◽  
Global Positioning ◽  
Coaxial Probe ◽  
Microstrip Structure

The mobile phone commerce is glooming exponentially in the twenty first century. The novelty in Planar Inverted Feed Antenna (PIFA) has a massive position in it. It has a coaxial probe feed and numerous shorting pins in excess of the intended patch antenna. Flame Retardant (FR4) substrate is used in intending of antenna. The recompense in initiating the Defected Ground Structure (DGS) over the patch as well as Defected Microstrip Structure (DMS) was scripted in the intended antenna. The intended petite outline, worth effective and the antenna can be used in the functions similar to Global Positioning System (GPS) at 1.49 GHz reverberating frequency, Worldwide Interoperability for Microwave Access (WiMAX) at 2.53 GHz and 3.5 GHz reverberating frequencies respectively. Simulation is prepared through High Frequency Structural Simulator (HFSS).

scholarly journals Composite GPS Patch Antenna for the AR Bandwidth Enhancement

2016 ◽  
Vol 2016 ◽  
pp. 1-6
Author(s):  
Minkil Park ◽  
Wonhee Lee ◽  
Taeho Son
Keyword(s):  
Radiation Pattern ◽  
Global Positioning System ◽  
Patch Antenna ◽  
Axial Ratio ◽  
Patch Antennas ◽  
Positioning System ◽  
Bandwidth Enhancement ◽  
Global Positioning ◽  
Hybrid Coupler ◽  
Vswr Measurement

A composite Global Positioning System (GPS) patch antenna with a quadrature 3 dB hybrid coupler was designed and implemented for working RHCP and had a broadband axial ratio (AR) bandwidth. We designed two patches as a FR-4 patch and 1.5 mm thickness thin ceramic patch with a quadrature 3 dB hybrid coupler. A CP radiation pattern was achieved, and the AR bandwidth improved by incorporating a quadrature 3 dB hybrid coupler feed structure in a micro-strip patch antenna. SMD by chip elements was applied to the quadrature 3 dB hybrid coupler. For the composite FR-4 and ceramic patch antennas, the VSWR measurement showed a 2 : 1 ratio over the entire design band, and the 3 dB AR bandwidth was 295 and 580 MHz for the FR-4 patch and ceramic patch antennas, respectively. The antenna gains for the composite FR-4 and ceramic patch antennas were measured as 1.36–2.75 and 1.47–2.71 dBi with 15.11–25.3% and 19.25–28.45% efficiency, respectively.

Development of performance-improved global positioning system (GPS) patch antenna based on sol-gel-synthesized dual-phase (Bi4Ti3O12)X- (CaCu3Ti4O12)1-Xcomposites

2016 ◽  
Vol 51 (6) ◽  
pp. 366-379 ◽  
Author(s):  
Thiruramanathan Pandirengan ◽  
Marikani Arumugam ◽  
Madhavan Durairaj ◽  
Gokul Raja Thangaiyanadar Suyambulingam
Keyword(s):  
Global Positioning System ◽  
Patch Antenna ◽  
Sol Gel ◽  
Dual Phase ◽  
Positioning System ◽  
Global Positioning

Novel acquisition of global positioning system signals based on parameter prediction and the chirp z-transform

2016 ◽  
Vol 231 (8) ◽  
pp. 1391-1401 ◽  
Author(s):  
Bing Xu ◽  
Lei Dou
Keyword(s):  
Global Positioning System ◽  
Doppler Shift ◽  
High Frequency ◽  
Positioning System ◽  
Sampled Data ◽  
Data Sequence ◽  
Small Interval ◽  
Global Positioning ◽  
Tracking Loops ◽  
Parameter Prediction

The acquisition stage in global positioning system receivers provides a coarse estimation of the Doppler shift and the code phase of the incoming signals. The accuracy of the estimation, especially the Doppler shift, greatly influences the subsequent tracking loops. Based on the parameter prediction and the chirp z-transform algorithm, a novel acquisition approach to acquire the Doppler shift accurately is proposed. The code phase and the Doppler shift are predicted first according to the desired trajectory of the vehicle and satellite ephemeris. Then, frequency refinement of the code-stripped signal is conducted within a small interval around the predicted Doppler shift by using the chirp z-transform algorithm. To reduce the computational load, the data sequence is down-sampled with an integrate and dump accumulator without degrading the performance of the proposed algorithm. Results indicate that, with only 1 ms sampled data, the proposed algorithm can achieve a high-frequency accuracy. Besides, the proposed algorithm can acquire signals with the carrier-to-noise ratio down to 31 dB-Hz.

Compact dual-band truncated patch antenna with fractal defected ground structure for wireless applications

2015 ◽  
Vol 9 (1) ◽  
pp. 163-170 ◽  
Author(s):  
B. Rama Sanjeeva Reddy ◽  
D. Vakula
Keyword(s):  
Patch Antenna ◽  
Ground Plane ◽  
Dual Band ◽  
Defected Ground Structure ◽  
Ground Structure ◽  
Bandwidth Enhancement ◽  
Compact Antenna ◽  
Wireless Applications ◽  
Radiation Properties ◽  
Global Positioning

In this paper, a compact, dual-band patch antenna is proposed over Minkowski fractal defected ground structure (DGS) for bandwidth enhancement of global positioning system (GPS) applications. The proposed design combines the truncated dual L-shaped slits cut on diagonal corners of radiating patch and fractal defect on the metallic ground plane. This concept shifts the frequencies to lower bands with improvement in antenna radiation properties. By deploying symmetrical and asymmetrical boundaries to the structure for the fractal DGS on metallic ground plane, improvement in bandwidth and gain are obtained. Compact antenna size is achieved for dual-band GPS frequencies of L1 (1.575 GHz) and L2 (1.227 GHz). The measured results for antenna prototype are (1.2–1.245 GHz): L2 band and (1.51–1.59 GHz): L1 band for 10 dB return loss bandwidth with better pattern radiation. Gain value with and without DGS is observed for compact antenna overall volume of 0.32λ0 × 0.32λ0 × 0.024λ0.

scholarly journals Global positioning system and associated technologies in animal behaviour and ecological research

2010 ◽  
Vol 365 (1550) ◽  
pp. 2163-2176 ◽  
Author(s):  
Stanley M. Tomkiewicz ◽  
Mark R. Fuller ◽  
John G. Kie ◽  
Kirk K. Bates
Keyword(s):  
Data Storage ◽  
Global Positioning System ◽  
Spread Spectrum ◽  
High Frequency ◽  
Animal Behaviour ◽  
Sensor Data ◽  
Mortality Data ◽  
Positioning System ◽  
Very High Frequency ◽  
Global Positioning

Biologists can equip animals with global positioning system (GPS) technology to obtain accurate (less than or equal to 30 m) locations that can be combined with sensor data to study animal behaviour and ecology. We provide the background of GPS techniques that have been used to gather data for wildlife studies. We review how GPS has been integrated into functional systems with data storage, data transfer, power supplies, packaging and sensor technologies to collect temperature, activity, proximity and mortality data from terrestrial species and birds. GPS ‘rapid fixing’ technologies combined with sensors provide location, dive frequency and duration profiles, and underwater acoustic information for the study of marine species. We examine how these rapid fixing technologies may be applied to terrestrial and avian applications. We discuss positional data quality and the capability for high-frequency sampling associated with GPS locations. We present alternatives for storing and retrieving data by using dataloggers (biologging), radio-frequency download systems (e.g. very high frequency, spread spectrum), integration of GPS with other satellite systems (e.g. Argos, Globalstar) and potential new data recovery technologies (e.g. network nodes). GPS is one component among many rapidly evolving technologies. Therefore, we recommend that users and suppliers interact to ensure the availability of appropriate equipment to meet animal research objectives.

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