Use matlab to plot the characteristic curve of the frequency response of a high pass RL circuit with a 300 mH inductor.

Sure, here's an example MATLAB code to plot the frequency response of a high pass RL circuit with a 300mH inductor:

% Define the circuit parameters
R = 1e3; % Resistance in ohms
L = 300e-3; % Inductance in henries

% Define the frequency range for the plot
f = logspace(0, 6, 1000); % Frequency range from 1Hz to 1MHz

% Calculate the magnitude and phase of the frequency response
H = R./(sqrt(R^2 + (2*pi*f*L).^2)); % Magnitude response
phi = -atan(2*pi*f*L./R); % Phase response

% Plot the magnitude and phase response
subplot(2,1,1)
semilogx(f, 20*log10(H))
title('Frequency Response of High Pass RL Circuit')
xlabel('Frequency (Hz)')
ylabel('Magnitude (dB)')
grid on

subplot(2,1,2)
semilogx(f, phi*180/pi)
xlabel('Frequency (Hz)')
ylabel('Phase (degrees)')
grid on

This code will plot the magnitude and phase response of the high pass RL circuit on a logarithmic frequency scale. You can modify the values of `R` and `L` to simulate different circuits.