A Wideband Waveguide Antenna with Nearly Equal E- and H-Plane Radiation Patterns

Table 1

Simulated and measured 3-dB beamwidths and gains of the proposed antenna.

Freq.; (GHz)	3-dB beamwidth (deg.)			Gain (dBi)
	Simulation		Measurement	Simulation		Measurement
	E-plane/H-plane; (𝑑𝑦 = 0 mm)	E-plane/H-plane; (𝑑𝑦 = 3 mm)	E-plane/H-plane; (𝑑𝑦 = 0 mm)	𝑑𝑦 = 0 mm	𝑑𝑦 = 3 mm	𝑑𝑦 = 0 mm
12	72/71.6	72.6/70.8	70.5/65.8	8.16	8.36	7.47
15	67/66.3	60.9/61.7	60.6/64.2	8.95	9.76	8.7
18	62.8/62.5	60.9/57.7	68.6/65.1	9.73	9.95	9.36

𝑑_𝑦 = 0 mm represents the situation that the width of the brim is equal to the width of the waveguide.