A rhombic antenna is a broadband directional wire antenna co-invented by Edmond Bruce and Harald Friis, in 1931, mostly commonly used in the high frequency (HF) or shortwave band.

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3. BRIEF INTRODUCTION
 Co-invented by EDMOND BRUCE & HARALD
FRIIS.
 It is broadband directional antenna.
 Used in HF (high frequency, also called shortwave)
ranges.

6. 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

7. TECHNICAL DETAILS
 It is based on principle of TRAVELLING
WAVE RADIATOR
 Also known as “Diamond Antenna” OR
“Travelling Wave Antenna”

8. TECHNICAL DETAILS (CONTD.)
 Directional Property
The fields in same direction is additive
Fields in opposite directions are self
cancelled out

9. RADIATION PATTERN

11. DESIGN
 Parameters
Tilt Angle
Leg Length (L)
Height above ground (h)
 Types of Rhombic Design
Alignment Design
Maximum Output Design

12. 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

13. 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 %

14. DISADVANTAGES
Requires large space for installation
 Low Transmission Efficiency
Relatively Larger Side Lobes
 It is not perfectly bi-directional

15. APPLICATIONS
 Radio Communication
 Short Wave Radio Broadcasting
 Long Distance Communications
 Point to Point Communications
 High Frequency Transmission And Reception

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