What is the radiation resistance of quarter wave monopole antenna?
Since a half-wave dipole has a gain of 2.19 dBi and a radiation resistance of 73 ohms, a quarter-wave monopole, the most common type, will have a gain of 2.19 + 3 = 5.19 dBi and a radiation resistance of about 36.8 ohms if it is mounted above a good ground plane.
What is the beam which for a half wave dipole antenna?
In the same manner we can find out the beam width of antenna. A dipole have 78 Degree beam in vertical plane and doubling the dipole makes beam width half. For 2 Dipole in vertical make vertical beam width to 32 Degree and further 8 Dipole make beam width as 7 degree.
What is the impedance of a half wave monopole?
Thus the half wave monopole’s virtual dipole is a full wave dipole. The impedance of monopole is half of its virtual dipole’s impedance. For example a quarterwave monopole with ground planehas impedance of 36 ohms, which is half of 75 ohms, the impedance of its virtual dipole, the halfwave dipole.
What is the range of a half wave dipole?
The range of frequency in which half-wave dipole operates is around 3KHz to 300GHz. This is mostly used in radio receivers. Construction & Working of Half-wave Dipole It is a normal dipole antenna, where the frequency of its operation is half of its wavelength.
Is the end of a dipole resonant or reactive?
An end-fed dipole is resonant (or not) just like a more ordinary center-fed dipole. The feedpoint (in the middle, near the end, or somewhere between) is transparent to the resonance of the wire. An exactly half-wave dipole isn’t resonant in the sense that its feedpoint impedance has a reactive component.
Why is the impedance at the end of a dipole high?
Since the impedance must repeat with every wavelength, this also means that the highest impedance (for example, at the ends of a half-wave dipole) is lower with a thicker wire. Finally, a practical point: since the impedance at the end of a dipole is very high, the common-mode impedance looks relatively low.