Synthesis of vehicular antenna NVIS radiation patterns using the method of characteristic modes

1994 ◽  
Vol 141 (3) ◽  
pp. 151 ◽  
Author(s):  
K.P. Murray
Keyword(s):  
Radiation Patterns ◽  
Characteristic Modes

scholarly journals Design of a T-Shaped Antenna Based on Characteristic Mode Manipulation for Metal-Framed Handset Application

Electronics ◽  
2018 ◽  
Vol 7 (10) ◽  
pp. 209
Author(s):  
Chong-Zhi Han ◽  
Guan-Long Huang ◽  
Tao Yuan ◽  
Ju-Zhen Wang
Keyword(s):  
Radio Frequency ◽  
Design Concept ◽  
Experimental Results ◽  
Radiation Patterns ◽  
Characteristic Mode ◽  
Rf Switches ◽  
Feed Point ◽  
Characteristic Modes ◽  
Operating Bandwidth ◽  
Metal Frame

Recently, metal-framed handset antennas have aroused much attention due to their fantastic appearance and superior robustness. In this paper, a T-shaped antenna suitable for integration with a USB connector is proposed for metal-framed handset application by utilizing the theory of characteristic modes (TCM). Five eigenmodes, one for the lower band and four for the higher band, were merged by a T-shaped metal frame, a feed point, and two shorting pins, as well as three radio frequency (RF) switches so as to broaden the antenna’s operating bandwidth. A prototype was fabricated in order to verify the design concept. Experimental results showed that the proposed antenna was able to cover bandwidths of 0.824–0.960 GHz (GSM band) and 1.710–2.690 GHz (DCS, PCS, UMTS, and LTE bands) with an acceptable radiation efficiency of up to 50% and satisfactory radiation patterns.

scholarly journals Study on the Relationships between Eigenmodes, Natural Modes, and Characteristic Modes of Perfectly Electric Conducting Bodies

2018 ◽  
Vol 2018 ◽  
pp. 1-13 ◽  
Author(s):  
Shaode Huang ◽  
Jin Pan ◽  
Yuyue Luo
Keyword(s):  
Circular Cylinder ◽  
Rectangular Plate ◽  
Radiation Patterns ◽  
Resonant Frequencies ◽  
Natural Modes ◽  
Electric Conducting ◽  
Electromagnetic Power ◽  
Characteristic Modes ◽  
Conducting Bodies ◽  
Internal Resonant

We specify the corresponding relationships between eigenmodes, natural modes, and characteristic modes of perfectly electric conducting (PEC) bodies. The internal resonant frequencies, external resonant frequencies, current distributions, and radiation patterns of the three kinds of modes are compared to identify the relationships. Firstly, we review the definitions of the three kinds of modes and discuss their characteristics of the electromagnetic power. After that, we illustrate the relationships between these modes with three typical structures, that is, the infinite circular cylinder, sphere, and rectangular plate.

A Broadband Circularly Polarized Cross-slotted Patch Antenna with Horizontal Meandered Strip (HMS)

Frequenz ◽  
2020 ◽  
Vol 74 (5-6) ◽  
pp. 191-199
Author(s):  
M. K. Verma ◽  
Binod K. Kanaujia ◽  
J. P. Saini ◽  
Padam S. Saini
Keyword(s):  
Circular Polarization ◽  
Patch Antenna ◽  
Impedance Matching ◽  
Axial Ratio ◽  
Impedance Bandwidth ◽  
Radiation Patterns ◽  
Circularly Polarized ◽  
Feeding Technique

AbstractA broadband circularly polarized slotted square patch antenna with horizontal meandered strip (HMS) is presented and studied. The HMS feeding technique provides the good impedance matching and broadside symmetrical radiation patterns. A set of cross asymmetrical slots are etched on the radiating patch to realize the circular polarization. An electrically small stub is added on the edge of the antenna for further improvement in performance. Measured 10-dB impedance bandwidth (IBW) and 3-dB axial ratio bandwidth (ARBW) of the proposed antenna are 32.31 % (3.14–4.35 GHz) and 20.91 % (3.34–4.12 GHz), respectively. The gain of the antenna is varied from 3.5 to 4.86dBi within 3-dB ARBW. Measured results matched well with the simulated results.

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