This example shows how to create, model, and analyze an inset-fed patch microstrip antenna at high frequencies. As the frequency of operation increases to millimeter waves, the antenna sizes decrease and the antennas are fabricated on printed circuit boards (PCBs). Such printed antennas are of light weight, are inexpensive, easy to integrate, and are widely used as components in a radar. The antenna that you will design in this example operates at a frequency of 77 GHz and can be used in an automotive radar receiver.
The length and the width of the patch are as provided in . The antenna is designed on a Rogers RO3003™ substrate, with the dielectric constant of
3, loss tangent of
130 um thickness. A copper conductor of thickness
17 um is used as the patch.
PL = 1049e-6; PW = 1412e-6; sub = dielectric('Name','RO3003','EpsilonR',3,'LossTangent',0.0013,'Thickness',130e-6); con = metal('Name','Copper', 'Conductivity', 5.96e7,'Thickness',17e-6);
Create an inset-fed patch microstrip antenna using the
patchMicrostripInsetfed object. The ground plane dimensions are
1800 um by
2800 um. The length and the width of the notch are specified as
100 um and
160 um, respectively. The strip line width is
100 um. The antenna feed is located at the end of the strip.
ant = patchMicrostripInsetfed('Length',PL,'Width',PW,'Height',sub.Thickness,... 'Substrate',sub,'Conductor',con,'GroundPlaneLength',1800e-6,... 'GroundPlaneWidth',2800e-6,'NotchLength',100e-6,'NotchWidth',160e-6,... 'StripLineWidth',100e-6,'FeedOffset',[-900e-6 0]); show(ant)
mesh function to create and display the mesh structure of the patch microstrip antenna. Mesh the antenna with a maximum edge length of
sparameters function to plot the s-parameters of patch antenna over a frequency range of
110 GHz. The antenna resonates at 77 GHz, with an approximate bandwidth of 2.7 GHz
sf = sparameters(ant,linspace(72e9,110e9,100));
pattern function to plot the 3-D radiation pattern of the antenna at
77 GHz. The gain obtained from the antenna is 7.6 dBi.
Plot the copolarization plot in the H-plane for the antenna at
77 GHz in a rectangular coordinate system with normalization.
The analyis results of the 77 GHz microstrip patch antenna show that it has good bandwidth and gain and is suitable suitable for use in applications like automotive radar receivers.
 Seyyedesfahlan, Mehdi and I. Tekin. “77 GHz PCB Patch Antenna.” URSI (International Union of Radio Science) Türkiye Ulusal Komitesi (2016).