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Based on that triangle monopole antenna has wide frequency band, this paper proposes a novel composite triangle monopole antenna, which is composed of three similar triangle metal plates. Through the electromagnetic simulation software CST Microwave Studioreg, we obtain its characteristics under the condition that its ground-plate is infinite perfect conductor. The simulation results show that the composite triangle monopole antenna not only has wide impedance frequency band, but also takes up smaller space comparing with triangle rnonopole antenna. On the above foundation, we construct composite triangle dipole antenna with two symmetrical composite triangle monopoles without ground-plate and simulate its impedance characteristic, the simulation results further prove that the composite triangle dipoles antenna has stable input impedance between 0.15 GHz and 2.0 GHz (resistance = 150 Omega, reactance = 0 Omega) and has wide frequency band.

wide band antennas; impedance frequency band; triangle monopole