Download Dielectric Resonator Antennas by K. M. Luk, K. W. Leung, J. R. James PDF

By K. M. Luk, K. W. Leung, J. R. James

Using a dielectric resonator as a resonant antenna used to be proposed in 1983. as a result of absence of metal loss, the dielectric resonator antenna (DRA) is extremely effective whilst operated at millimetre wave frequencies. With using excessive dielectric consistent fabric, the DRA is usually used as a small and coffee profile antenna while operated at low microwave frequencies. low-priced dielectric fabrics are actually simply on hand commercially: encouraging extra antenna engineers to layout communique platforms with DRAs.

Although DRAs are express promise in functional functions, strangely, there's no study precis in reference shape on DRAs to be had. This ebook will replace present literature and current new details on DRAs.

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Yung, “Annularslot-coupled dielectric resonator antenna,” Electron. , vol. 34, No. 13, pp. 1275-1277, June 1998 K. W. Leung and K. M. Luk, "Radiation characteristics of aperturecoupled hemispherical dielectric resonator antenna," Microw. and Opt. Techn. , vol. 7, No. 14, pp. 677-679, Oct. 1994 K. W. Leung and M. W. To, “Aperture-coupled dielectric resonator antenna with a perpendicular feed,” Electron. , vol. 33, No. 12, pp. 1000-1001, June 1997 K. W. Leung and M. W. To, “Slot-coupled dielectric resonator antenna using a proximity feed on a perpendicular substrate,” Electron.

47) H where uij = −l + (i + j )d , A(±1) = 1, and A(0) = −2 cos kd. Note that Z pq does not involve any integration, and, thus, the calculation is extremely fast. 45) is very easy. The only care that has to be exercised is that uij may be zero for some i,j, for which Jˆn ( kuij ) = 0. Therefore, uij should be checked in the program, as the (backward) recurrence formula for Jˆn ( x ) cannot be used when x = 0. After the Iq’s are found, the input impedance can be obtained N by simply using Zin = β ∑ I n f n (0) , where β = 1 for the equivalent dipole n =1 configuration and β = 1/2 for the original (monopole) configuration.

70) the height h is multiplied by two to account for the image effect of the ground plane. The corresponding ARs are shown in Fig. 25(b). 96 GHz), as desired. 4 %, which is typical for a singly fed CP DRA. Although it is seen in Fig. 25(a) that the input impedance can be changed by varying the slot radius, care has to be exercised, since the axial ratio will also change accordingly as is observed in Fig. 25(b). 2 (b) Fig. 25 Measured return loss and axial ratio against frequency for different slot radii: (a) Return loss; (b) Axial ratio.

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