This document provides information on how to design microstrip patch antennas in ADS 2009 software. It discusses different types of microstrip antenna feeds such as microstrip line feed, coaxial feed, aperture coupled feed, and proximity coupled feed. It also compares these different feed types and summarizes their characteristics, advantages, and disadvantages. The document includes an example of designing a rectangular microstrip patch antenna on a dielectric substrate to resonate at 10GHz. It further compares ADS, HFSS, and CST electromagnetic simulation software and recommends ADS 2009 as a good choice for both frequency domain and circuit simulations. Contact information is provided at the end.

1. HOW TO DESIGN MICROSTRIP
PATCH ANTENNA IN ADS 2009
Prepared By,
R.THANDAIAH PRABU M.E., (Ph.D.,)
PRATHYUSHA ENGINEERING COLLEGE, CHENNAI
thandaiah@gmail.com
Mobile: +91-9751445529

2. Microstrip Antenna
Side view

3. Representative Shapes of
Microstrip Patch Elements

4. Microstrip Line Feed
Equivalent circuits

5. Co- Axial Feed / Probe Feed
Equivalent circuits

6. Aperture Coupled Feed
Equivalent circuits

7. Proximity Coupled Feed
Equivalent circuits

8. Characteristics Micro Strip
Line Feed
Coaxial Feed Aperture
Coupled Feed
Proximity Coupled
Feed
Spurious Feed
Radiation
More More Less Minimum
Reliability Better Poor due to
soldering
Good Good
Ease of Fabrication Easy Soldering and
Drilling Needed
Alignment
required
Alignment required
Impedance Matching Easy Easy Easy Easy
Bandwidth (achieved
with Impedance
Matching)
2 to 5% 2 to 5% 21% 13%
Advantages Simple and Easy to
Fabricate, it can be
eached on the same
substrate
Feed can be
placed at any
desired
direction, Low
spurious
radiation
Eliminates
spurious
radiation
Eliminates spurious
radiation
Disadvantages It gives undesired
radiation
Narrow
bandwidth and
difficult to
model
Fabrication
Process is
difficult
Thickness of
antenna increases

9. Design Calculation for Transmission Line Model

10. Example
Design a rectangular microstrip antenna
using a substrate (RT/DUROID 5880) with
dielectric constant of 2.2, h = 0.1588 cm
(0.0625 inches) so as to resonate at 10 GHz.

11. Software Comparison
ADS HFSS CST
Advanced Design
System
High Frequency
Structural Simulator
Computer Simulation
Technology
2 D EM Simulator 3 D EM Simulator 3 D EM Simulator
Method of Moment
(MoM)
Finite Element Method
(FEM)
Finite Integration in
Technique (FIT)
Active/passive lumped
model simulator
Passive circuit
Simulation
passive and Active
circuit simulation
ADS – 2009 good choice
for both domain
HFSS FEM is much
better than CST
Frequency Domain
Time domain of HFSS
is not as good as CST

12. How to Design in ADS 2009

77. Contact:
thandaiah@gmail.com
thandaiahprabu.ece@prathyusha.edu.in
Mobile: +91-9751445529