Broadband dual-frequency V-shape patch antenna

✍ Scribed by Chia-Luan Tang; Jyh-Ying Chiou,and; Kin-Lu Wong

• Publisher: John Wiley and Sons
• Year: 2000
• Tongue: English
• Weight: 164 KB
• Volume: 25
• Category: Article
• ISSN: 0895-2477
• DOI: 10.1002/(sici)1098-2760(20000420)25:2<121::aid-mop11>3.0.co;2-3

✦ Synopsis

Figure 4 Far-field patterns at frequency s 1.8 GHz on a Monopole antenna with parasitic helix at L s 0.25 , H s 0.105 , 0 0 Ž . C s 0.03 , ␣ s 10Њ, and N s 8.875, and b monopole antenna at 0 . . . . . . L s 0.25 . Measured E , measured H 0 radiation patterns at L s 0.25 , H s 0.105 , C s 0.03 , 0 0 0 ␣ s 10Њ, and N s 8.875. Compared with the radiation pat-Ž . terns of the monopole antenna shown in Figure 4 b , it can be seen that they closely resemble each other. They show that the far-field characteristics are dominated by those of Ž .

Ž . the monopole antenna. According to Figure 4 a and b , the linear polarization of the monopole antenna is seen to be retained in our antenna because the power level of H is on average 15 dB lower than that of E . Figure 5 shows that the power level of the pattern of the normal-mode helix is about 28 dB lower than that of our monopole antenna with a parasitic helix. From these observations, we see that the increase in bandwidth does not significantly affect the far-field characteristics of the antenna. Further investigation showed that the bandwidth of the antenna can be further increased slightly by a decrease of the pitch angle of the helix or a reduction of the height of the helix.