Electromagnetic Fields of a Small Loop Antenna On the Surface of a Polarizable Medium

Studies are made in this paper on the characteristics of the electromagnetic fields produced by a small loop antenna placed on the surface of a medium which exhibits induced‐polarization effects. An approximate expression for the effective impedance of a polarizable medium is used for this purpose. Both the real and imaginary parts of the impedance are appreciably frequency‐dependent. Different expressions suitable for specific ranges of time and specific values of the characteristic parameter of the medium are obtained for the fields when the antenna is excited by a step‐function current source. The step‐function responses show marked differences in characteristics as the parameter of the medium is increased from very small values, typical of membrane polarization, to very large values corresponding to electrode polarization. The rate at which the magnitude of the transients decays with time is highly dependent on this parameter. The rate of decay in the initial small part of the transient curve increases, whereas in the remaining major part the rate decreases with rise in the value of the parameter.

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Reply to \"Comments on 'Loss Mechanisms in the Electrically Small Loop Antenna'\" [Antenna Designer's Notebook]

IEEE Antennas and Propagation Magazine ◽

10.1109/map.2015.2470663 ◽

2015 ◽

Vol 57 (5) ◽

pp. 125-126

Author(s):

B.A. Austin ◽

A.G.P. Boswell ◽

M.A. Perks

Keyword(s):

Loop Antenna ◽

Small Loop ◽

Loss Mechanisms

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KARAKTERISTIK MAGNETIC LOOP PROBE POLIGONAL SEBAGAI APLIKASI PENGUKURAN NEAR FIELD

Simetris Jurnal Teknik Mesin Elektro dan Ilmu Komputer ◽

10.24176/simet.v11i1.3941 ◽

2020 ◽

Vol 11 (1) ◽

pp. 217-222

Author(s):

Haryo Dwi Prananto ◽

Priyo Wibowo ◽

Tyas Ari Wahyu Wijanarko ◽

Wuwus Ardiatna ◽

R. Harry Arjadi

Keyword(s):

Near Field ◽

Magnetic Loop ◽

Vector Network Analyzer ◽

Loop Antenna ◽

Network Analyzer ◽

Small Loop

Pada pengujian kompatibilitas elektromagnetik khususnya pada pengukuran near field, pengukuran medan magnet sangat diperlukan. Salah satu alat pengukuran yang digunakan adalah magnetic loop probe. Penelitian ini dilakukan untuk membandingkan loop probe pada jumlah sisi geometrinya, dan belum ada referensi yang membahas tentang topik ini. Magnetic loop probe didesain dalam tujuh bentuk geometri yaitu bentuk segi 3 (ada dua model), segi 4, segi 6, segi 8, segi 10, dan segi tak hingga (lingkaran) dimana parameter keliling geometrinya sama. Magnetic loop probe didesain dengan menggunakan perhitungan sebagai small loop antenna Karateristik kelima desain probe dianalisis dengan mengukur S21 sebagai sensitivitas menggunakan Vector Network Analyzer. Karateristik bentuk probe maupun gain dan sensitivitasnya dibahas dalam makalah ini.

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