A radio frequency (RF) communications system may include a local RF communications device and an RF antenna coupled to the local RF communications device. The RF antenna may include a cavity backing housing, a conical RF launch structure having an apex positioned within the cavity backing housing, and an elongate electrical conductor having a proximal end extending through the apex of the conical RF launch structure and a distal end spaced apart from the conical RF launch structure to define an elongate RF coverage pattern. The system may further include at least one remote RF communications device within the elongate RF coverage pattern to wirelessly communicate with the local RF communications device.

An electronic device having an antenna, according to the present disclosure, includes: a first cone radiator which is provided between a first substrate and a second substrate, the upper part of which is connected to the first substrate and the lower part of which is connected to the second substrate, and which has an opening at the top thereof; a metal patch which is formed on the first substrate so as to be separated from the top opening; a second cone radiator which is provided between the first substrate and the second substrate, the upper part of which is connected to the first substrate and the lower part of which is connected to the second substrate, and which has an opening at the top thereof; and a shorting pin which is formed to electrically connect the metal patch and a ground layer of the second substrate.

A device for detection of a clipped ringing signal includes a ringing generator, a ringing signal adjusting-and-driving section, and a voltage-detection and clipping-judgment section. The ringing signal adjusting-and-driving section receives a ringing signal from the ringing generator. The ringing signal adjusting-and-driving section also receives a gain adjusting signal. The ringing signal adjusting-and-driving section outputs the ringing signal to a subscriber loop after adjusting the gain thereof according to the gain adjusting signal. The voltage-detection and clipping-judgment section is coupled to the subscriber loop to detect the loop voltage waveform of the subscriber loop, and to determine that the ringing signal is clipped when the loop voltage waveform is discontinuous. When the ringing signal is clipped, the voltage-detection and clipping-judgment section sends the gain adjusting signal to drive the ringing signal adjusting-and-driving section to attenuate the gain of the ringing signal.

A device for detection of a clipped ringing signal includes a ringing generator, a ringing signal adjusting-and-driving section, and a voltage-detection and clipping-judgment section. The ringing signal adjusting-and-driving section receives a ringing signal from the ringing generator. The ringing signal adjusting-and-driving section also receives a gain adjusting signal. The ringing signal adjusting-and-driving section outputs the ringing signal to a subscriber loop after adjusting the gain thereof according to the gain adjusting signal. The voltage-detection and clipping-judgment section is coupled to the subscriber loop to detect the loop voltage waveform of the subscriber loop, and to determine that the ringing signal is clipped when the loop voltage waveform is discontinuous. When the ringing signal is clipped, the voltage-detection and clipping-judgment section sends the gain adjusting signal to drive the ringing signal adjusting-and-driving section to attenuate the gain of the ringing signal.