диафрагмированные волноводные фильтры / cebec00e-3d53-4cc6-8501-1eefe793b975

FIGURE 18. The measured normalized (a) E-plane (xy) coand cross-polar and (b) H-plane (xz) copolar radiation pattern of narrow-band antenna configuration E.

FIGURE 19. The simulated and measured S11 and maximum realized gain (xy plane) of narrow-band antenna configuration F.

FIGURE 20. The simulated and measured S11 and maximum realized gain (xy plane) of narrow-band antenna configuration G.

both beneath the substrate and on the multilayered superstrate in the ARMA with shorting copper strips, two different resonances are excited in this configuration, which, in turn, provides a nar- row-band response around each SRR’s resonance frequency. The plots in Figure 20 confirm narrow-band functionality at 6.66 GHz and 7.69 GHz, with a peak measured gain of 3.02 dBi and 1.98 dBi around each SRR pair’s resonance frequency. The simulated efficiency for narrow-band configurations E and F is 86% at 6.58 GHZ and 73% at 7.31 GHz, respectively, and for configuration G, it is 84% and 72% at 6.52 GHz and 7.51 GHz, ­respectively. The antenna’s measured radiation pattern, shown in Figure 21, indicates a monopole-like omnidirectional character.

Simulated contour plots of the Poynting vector for configurations E, F, and G are shown in Figure 22, which indicates an exactly complementary response to that of notched UWB configurations B, C, and D, respectively, reconfirming the narrow-band antenna response. Antenna configurations E, F, and G are excited at 6.58 GHz, 7.31 GHz, and 6.52 GHz/7.51 GHz, respectively, because of the narrow bandpass response of the SRRand copper-strip-loaded CPW line. We can observe from the plots in Figure 22(a)–(c), all of which indicate nar- row-band excitation of the antenna (configurations E, F, and G), that the distance from the antenna’s feed port to the position of filtering action exactly matches the position of the respective SRR pair and copper strips (on the other side) on the CPW.

CONCLUSIONS

In this article, we presented a new design concept for a multifunctional antenna providing frequency-notched UWB operation and multiple narrowband configurations. We validated the design concept using an electromagnetic solver, circuit simulation, and practical measurements. The proposed technique of achieving frequency notches and narrow-band operation at the same frequency using multilayered

Frequency (GHz)

Frequency (GHz)

10

8

6

4

2

0

10

8

6

4

2

0

A

B

10 15 Distance (mm)

(a)

A

B

10 15 Distance (mm)

(c)

Frequency (GHz)

Distance (mm)

(b)

Poynting_Ma

2.1000e+005

1.9456e+005

1.7912e+005

1.6368e+005

1.4823e+005

1.3279e+005

1.1735e+005

1.0191e+005

8.6470e+004

7.1028e+004

or coauthored more than 200 journal papers, numerous book ­chapters, and approximately 400 refereed conference papers. He is a Life Fellow of the IEEE.

Jawad Y. Siddiqui (jysiddiqui@ieee.org) is an associate professor in the Department of Radio Physics and Electronics, University of Calcutta, India. His research areas include ultrawideband antennas, frequency reconfigurable antennas, tapered slot antennas, antennas for cognitive radio applications, and ­ultrawideband radar systems. He is a Senior Member of the IEEE.

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