Beam Width Between First Null Broadside Array Calculator

Beam Width Between First Null Formula:

\[ BWFN = \frac{2 \times \lambda_b}{d \times N} \]

Beam Width Between First Null (BWFN):

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1. What Is Beam Width Between First Null?

Beam Width Between First Null (BWFN) in a broadside array refers to the angular separation between the first nulls on either side of the main beam in the radiation pattern of an antenna array where identical parallel antennas are arranged along a line perpendicular to the array axis.

2. How Does The Calculator Work?

The calculator uses the BWFN formula:

\[ BWFN = \frac{2 \times \lambda_b}{d \times N} \]

Where:

\( BWFN \) — Beam Width Between First Null (radians)
\( \lambda_b \) — Broad Side Array Wavelength (meters)
\( d \) — Distance between antennas (meters)
\( N \) — Number Of Turns Of Array Antenna

Explanation: This formula calculates the angular width between the first nulls in the radiation pattern of a broadside array antenna system.

3. Importance Of BWFN Calculation

Details: Calculating BWFN is crucial for antenna design and analysis as it helps determine the beamwidth and directivity of the antenna array, which affects signal coverage and interference patterns.

4. Using The Calculator

Tips: Enter the wavelength in meters, distance between antennas in meters, and number of antenna turns. All values must be positive numbers greater than zero.

5. Frequently Asked Questions (FAQ)

Q1: What is a broadside array?
A: A broadside array is an antenna configuration where multiple identical antennas are arranged parallel to each other along a line perpendicular to the direction of radiation.

Q2: Why is BWFN important in antenna design?
A: BWFN helps determine the angular resolution and beam characteristics of an antenna array, which is essential for optimizing signal transmission and reception patterns.

Q3: What units are used for BWFN?
A: BWFN is typically measured in radians, though it can be converted to degrees for practical applications (1 radian ≈ 57.3 degrees).

Q4: How does antenna spacing affect BWFN?
A: Smaller spacing between antennas generally results in a wider beamwidth (larger BWFN), while larger spacing produces a narrower beamwidth (smaller BWFN).

Q5: Can this formula be used for end-fire arrays?
A: No, this specific formula is designed for broadside arrays. End-fire arrays have different radiation characteristics and require different calculations.