Development of a Methodology for Simulating Active Receiving Antennas

1
Development of a Methodology for Simulating
Active Receiving Antennas
By Harry S. Figueroa Frank Negrón
Barbara Préstamo Advisor Dr. Rafael
Rodríguez-Solís
2
Agenda

• Description
• Theory
• Procedure
• Implementation
• Results
• Applications

3
Description

• This research consists in the development of a
  methodology to design active antennas in the
  receiving mode.

4
What are Active Antennas?

• Definition
• Advantage
• Difference with conventional antenna system

5
Antenna Design

• Type of Antenna
• Advantage
• Software used for simulation
• Results of Simulation

6
Scattering Parameters

• Definition
• S11 the input reflection coefficient (b1/a1)
• S21 the forward transmission coefficient
  (b2/a1)
• S22 the output reflection coefficient (b2/a2)
• S12 the reverse transmission coefficient
  (b1/a2)

7
Methodology for Simulation

• Objective convert the 1-port antenna into a
  2-port circuit.
• S110 S21S121
• We calculated S22 parameter using the
  generalized scattering parameters equations.

8
Design of Low Noise Amplifier
1. Choose Proper Amplifier
2.Design the Interstage Matching Networks
3.Design the DC Bias 3.1 place capacitors
9
Layout of the Design

• Layout of the system to be fabricated, using the
  milling machine, on the substrate.
• The gaps shown are for the capacitors and the
  transistor amplifier.
• Total length of the system is approximate 62mm
  (2.5).

10
Results of the Design
11
Noise Figure of the Design
Noise at 5.85GHz 1.388 dB
12
Physical Implementation of the Design
13
Results of Second Design
14
Noise Figure of Second Design
Noise at 5.85GHz .253 dB
15
Physical Implementation of the Second Design
16
Results of Both Designs
17
Applications of Active Antennas

• Active antennas have many potential applications
  in radar and wireless communications and as low
  cost compact transceivers.
• Interest in this type of active microstrip
  antenna is growing because of its potential
  applications in large phase arrays and in spatial
  power combining amplifiers.
• For reception applications, the goal is to
  achieve good noise performance and reasonable
  gain flatness.

18
Work in Progress

• Test the whole system using the HP 8510 Network
  Analyzer.

19
Questions?
20
Results of the Design
21
Results of Second Design