Printed Antennas

Microstrip Patch

Compact Multi-band Antenna
for Wireless Applications

Dipole Antenna

Microstrip Patch Antenna

Microstrip patch antennas are among the most popular antennas, used in various application areas. Model building for this type of antennas can be done in two ways: in WIPL-D general-purpose 3D modeler and in the tool specialized for printed structures, AW Modeler. A simple microstrip patch antenna is simulated here. The simulated results are verified with measurements performed by WIPL-D staff.

The antenna is printed on RT Duroid 5880 substrate of height 1.5748 mm and of complex permittivity 2.2(1-j 0.0004). The model is made on a finite substrate and over finite ground plane (Fig. 1). The copper conductor is taken with finite conductivity of σ = 19 MS/m, to account for surface roughness. The antenna is fed by a probe that is extended to a coaxial line. A part of the coaxial line is included in WIPL-D model to simulate effects of realistic coaxial feed (Fig. 2).

Figure 1. WIPL-D Model of Patch Antenna

Figure 2. Coaxial Feed of the Antenna

The simulated and measured S-parameters (Fig. 4), and radiation pattern in E-plane (Fig. 5) agree excellently. The software predicted the resonance at 1.905 GHz, while measurements pointed to 1.906 GHz. The simulated bandwidth is 19.35 MHz while the measured one is 19.3 MHz. The relative discrepancy is 0.05% for resonant frequency and 0.25% for bandwidth. The prototype (Fig. 3) is fed from the back side, by a probe which is connected to coax line via standard SMA connector.

Figure 3. Front Side of Antenna Prototype

Figure 4. S11 of the coaxially fed patch antenna

Figure 5. Radiation pattern in E-plane

PDF application note

If you have a specific problem in mind and you are not sure if WIPL-D software can handle that problem, contact us. We will analyze your needs and try to help, and if our products satisfy your requirements, we will make you the best possible offer for purchase.