  A novel mm-wave microstrip-fed patch antenna with broad bandwidth and wide
angular coverage suitable for integration in planar arrays is designed,
analyzed and verified by measurements. The antenna provides a bandwidth of
13.1% between 34.1 GHz and 38.9 GHz, which is achieved by a slotted multiple
resonances microstrip patch and a matching circuit in microstrip technology.
The antenna is built on RO3003 substrate with top and ground layers, which is
low cost compared to other techniques. For simple integration with microstrip
and frontend circuits, the feeding happens in the top layer with a microstrip
coupling gap feed. The wide half power beamwidth is achieved by suitably
designed parasitic patches for the first resonant mode. The second resonant
mode has a wide half power beamwidth by default. The half power beamwidth is
between 100{\deg} and 125{\deg} within the matched bandwidth, which is a very
good value for a microstrip patch antenna radiating over a ground plane. The
measured input impedance and radiation characteristic show very good agreement
with simulation results.
