What is the bandwidth for a half wave dipole antenna?

Bandwidth Curve for the designed Half-Wave Dipole Antenna Bandwidth of the antenna has shown in the Fig. 4. Bandwidth of the designed antenna has found as 0.54983 GHz. Ranges of frequency at -10 dB are 4.6667 GHz and 5.2165 GHz.

How can you increase the impedance of a folded dipole antenna?

The impedance increase can be deduced from the fact that the power supplied to a folded dipole antenna is evenly shared between the two sections which make up the antenna. This means that when compared to a standard dipole the current in each conductor is reduced to a half.

What is the gain of a half wave dipole antenna?

2.15 dBi
Neglecting electrical inefficiency, the antenna gain is equal to the directive gain, which is 1.5 (1.76 dBi) for a short dipole, increasing to 1.64 (2.15 dBi) for a half-wave dipole.

How is antenna bandwidth calculated?

The bandwidth is often specified in terms of its Fractional Bandwidth (FBW). The FBW is the ratio of the frequecny range (highest frequency minus lowest frequency) divided by the center frequency. The antenna Q also relates to bandwidth (higher Q is lower bandwidth, and vice versa).

How can I increase my antenna bandwidth?

Bandwidth of antenna can be increased by various methods such as by increasing the thickness of substrate with low dielectric constant, by probe feeding, by cutting slot, by cutting notches and by different shapes of antenna.

How do you feed a half wave dipole?

The half wave dipole is normally fed in the middle where the impedance falls to its lowest. In this way, the antenna consists of the feeder connected to two quarter wavelength elements in line with each other.

Which of the antenna has the highest bandwidth?

The achieved largest impedance bandwidth is 155.16\% considering VSWR 2:1. The proposed antenna will serve various applications for Bluetooth, UWB cellular systems and satellite communication. With the higher bandwidth the antenna also gives lower mutual coupling than the antenna without EBG.

Which is bandwidth enhancement technique?

Two intrinsic procedures can be applied to improve the bandwidth of a single layer direct fed microstrip patch antenna. One is increasing the substrate thickness and the other is decreasing the dielectric constant of antenna substrate (relative permittivity of near to one).

How can I increase the bandwidth of a dipole antenna?

You can increase the bandwidth of a dipole by adding capacitive hats (you may have to shorten the dipole to maintain a given resonant frequency). Conical hats, hemispherical hats, or hats with a circular rim will work better than short 90 degree radial spikes at the ends, or an H shaped dipole.

What is the current on a half wave dipole antenna?

Figure 1. Electric Current on a half-wave dipole antenna. The input impedance of the half-wavelength dipole antenna is given by Zin = 73 + j42.5 Ohms. The fields from the half-wave dipole antenna are given by: The directivity of a half-wave dipole antenna is 1.64 (2.15 dB).

What is the best shape for a dipole antenna?

Conical hats, hemispherical hats, or hats with a circular rim will work better than short 90 degree radial spikes at the ends, or an H shaped dipole. Small capacitive hats might even raise the radiation resistance, as well as broadening the dipole’s bandwidth.

What is the resonant length of a thin dipole antenna?

This is a desirable property since the antenna will be better matched to the radio (transmitter or receiver), and hence is often done in practice for thin dipoles. The radiation pattern remains virtually the same. The above resonant length (0.48 ) is valid if the dipole is very thin.