In this linear region, the measured

image impedance, Z", was related to the frequency, f, and the coating capacitance by

so] and the

image impedance of coupled-line section T and coupled-line section S are [Z.

To understand the structural stop band completely the dispersion data and the image impedance of each of the cells of the log periodic structure are examined.

To overcome this, the variation of image impedance must be minimized.

The dual-feed patch radiator has a cardioid radiation pattern with the maximum in the backfire direction, has an image impedance that remains almost constant from a very low frequency up through the first resonance and has reduced width at resonance to allow more elements in a given space.

11~ different by 180|degrees~), near constant image impedance will result.

This is the result of the factor of (1 -- u2/uC2)-1/2 in the mid-shunt image impedance [Z.

The inductances of gate and drain lines are determined from the value of the line image impedance and [[omega].

The wave will be reflected partially at the discontinuity to adapt to these new conditions, mainly to the changed image impedance.

The radiated power from a discontinuity is a function F of the discontinuity geometry, the image impedance Z and the relative thickness, normalized with the free space wavelength, of the substrate d.

This implies that the image impedance of both structures is equal to the reference impedance [Z.

The image impedances of both circuits can be calculated from (1) and (2) as