Optimization of the Bandwidth of Electrically Small Planar Antennas

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equires less total wire length to achieve resonance relative to the configurations presented in Figure 5. One of the performance drawbacks is that it typically introduces some level of orthogonal TE mode radiation, resulting in minor overhead null fill. Figure 5. The electrically small planar meander line antennas. © The MITRE Corporation. All rights reserved
© The MITRE Corporation. All rights reserved Figure 6. The feed point impedance of the electrically small planar meander line antennas. Antenna configuration W1 has an overall dipole length of 8.36 cm and a diameter of 4 cm, corresponding to a length-to-diameter ratio of 2.09. It is resonant at a frequency of 319.3 MHz, corresponding to a ka equal to 0.31. It has a resonant radiation resistance of 2.3 and a Q of 325.9, corresponding to a Q/Qlb ratio of 8.86, which is substantially higher than that of meander line M1. Its radiation efficiency is 77.1%. Antenna configurations W2 and W3 use near field, reactive coupling matching to achieve the impedance match relative to 50 and an arbitrary characteristic impedance of 355, respectively. Antenna configuration W4 uses a shunt-stub, parallel inductor approach to achieve an impedance match relative to 50.
Page 1 and 2: Optimization of the Bandwidth of El
Page 3 and 4: value of ka, where k is the free sp
Page 5 and 6: © The MITRE Corporation. All right
Page 7 and 8: Fig. 3 Comparison of the cylindrica
Page 9: © The MITRE Corporation. All right
Page 13 and 14: Figure 8. Electrically small planar
Page 15 and 16: Figure 9. Radiation pattern of the
Page 17 and 18: © The MITRE Corporation. All right
Page 19 and 20: Table 2. Performance comparison of
Page 21: © The MITRE Corporation. All right

Optimization of the Bandwidth of Electrically Small Planar Antennas

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