MADE BY-

PRATYUSH

BRIEF INTRODUCTION

Co-invented by EDMOND BRUCE & HARALD FRIIS.

It is broadband directional antenna.

Used in HF (high frequency, also called shortwave) ranges.

STRUCTURE DETAILS

It consists of four straight wires arranged in form

of rhombus and terminated by resistor

Rhombus is equilateral parallelogram with two

opposite acute angles

Mounted horizontally and placed at λ/2 above

ground

TECHNICAL DETAILS It is based on principle of TRAVELLING

WAVE RADIATOR

Also known as “Diamond Antenna” OR

“Travelling Wave Antenna”

TECHNICAL DETAILS (CONTD.)

Directional Property

The fields in same direction is additive

Fields in opposite directions are self cancelled out

RADIATION PATTERN

DESIGN

Parameters

Tilt Angle

Leg Length (L)

Height above ground (h)

Types of Rhombic Design

Alignment Design

Maximum Output Design

ADVANTAGES

It can be used in MUSA (Multiple Unit Steerable Antenna) System

It operates over wide range of frequencies

It is suitable for rapid switching

It is highly directional

ADVANTAGES (CONTD..)

Relatively Higher Efficiency

Easier to construct

High Gain can be achieved

Input Impedance & Radiation Pattern are relatively constant

Radiation efficiency is 40-50% which can be enhanced to 70-80 %

DISADVANTAGES

Requires large space for installation

Low Transmission Efficiency

Relatively Larger Side Lobes

It is not perfectly bi-directional

APPLICATIONS

Radio Communication

Short Wave Radio Broadcasting

Long Distance Communications

Point to Point Communications

High Frequency Transmission And Reception

THANKYOU