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Additional resources for Microstrip Antenna Theory and Design
1979): 'The reflection definition of the characteristic impedance of microstrip', IEEE Trans, MTT-27, pp. , and RIMAI, E. (1952): 'Simplified theory of microstrip transmission systems', Proc. IRE, 40, pp. 1651-1657 BAHL, 1. , and TRIVEDI, D. K. (1977): *A designer's guide to microstrip line', Microwaves, 16, pp. , and RIDELLA, S. (1976): 'On the definitions of characteristic impedance of uniform microstrip', Alta Frequenza, 45, pp. 111-116 BRACKELMANN, W. (1967): 'Kapazitaten und induktivitaten gekoppelter streifenleitungen\ Arch.
AGARD Conf. 139 Antennas for Avionics, Munich, pp. , and PAUL, D. H. (1975): 'A rapid versatile method of designing printed stripline aerial arrays*. Milliard Research Laboratories Annual Review, pp. 36-37 HWANG, T. , RUTLEDGE, D. , and SCHWARZ, S. E. (1979): 'Planar sandwich antennas for submillimetre applications*, Appl. Phys. , 34, pp. 9 - 1 1 ITOH, T , and HEBERT, A. S. , MTT-26, pp. 987-991 JAMES, J. , and HENDERSON, A. (1978a): 'Electrically short monopole antennas with dielectric or ferrite coatings', Proc.
5 together with eqn. 4 enable design curves to be derived for the parameters of eqn. 2 3 . 6) with x = h for w > (h/2n) > 2r and * = 2nw for (h/2n)>w > 2t. Hammerstad and Bekkadal (1975) have suggested refinements to these expressions for ee andZm to obtain increased accuracy, but it is not entirely clear what low-frequency range limitations must be imposed. Clearly, these static field calculations become progressively more inaccurate as the frequency is raised. 7) where ee(f) and ee are the values of the effective relative permittivity at a frequency /GHz and at zero frequency, respectively.