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Radiation pattern of cylindrical-wraparound chirostrip antennas

✍ Scribed by Le-Wei Li; Tian-Xia Zhao; Mook-Seng Leong

Publisher
John Wiley and Sons
Year
1999
Tongue
English
Weight
126 KB
Volume
21
Category
Article
ISSN
0895-2477

No coin nor oath required. For personal study only.

✦ Synopsis

Figure 6 Radiation field pattern with both E-plane and H-plane. Ž . Ž . a f s 3.7 GHz. b f s 4.2 GHz 2 1

Ž . voltage 0Њ shown in Figure 4. By using these couples, balanced resonant frequencies can be obtained.

EXPERIMENTS

An FR4 substrate with dielectric constant s 4.4 and thickr ness h s 1.6 mm is used. For the requirement of 50 ⍀ impedance, the width of the strip is 1.6 mm, the effective dielectric constant s 3.32, and the guided wavelength eff s 40.8 mm. g In practice, we design a double-ring microstrip antenna with an inner ring of radius r s 5.2 mm and an outer ring of 1 Ž . radius r s 8.0 mm shown in Fig. 4 , which correspond to 2 frequencies f s 4.2 GHz and f s 3.7 GHz.

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