A novel TM21-mode circularly polarized (CP) annularring microstrip antenna (ARMSA) is presented. The annular ring is designed working at TM21 mode, and conical radiation pattern is obtained. At the inner of annular ring, a simple ring-shaped feeding line is arranged to implement impedance matching and CP operation. Therefore, the antenna has good impedance and CP performance, as well as a compa...

This paper presents a conical monopole antenna with two C-shaped slots to provide a frequency stopband to suppress interference. Compared to previous work reported in the literature, the antenna provides increased gain suppression to vertically polarised signals within the notch-band of up to 41.5 dB in four specific directions. It also yields omni-directional radiation patterns at frequencies ...

An Ultra-Wideband (UWB) antenna is required for UWB communications systems, such as the Joint Tactical Radio System (JTRS). In this case, the desired antenna must cover a bandwidth of 20 MHz to 4 GHz, be omnidirectional, be convenient to transport and deploy, and be able to transmit 200 Watts of power. Conventional discone antennas are candidates for such systems, but they have insufficient ban...

Abstract— Equivalent charge method is used to design ultra wide band asymptotic conical dipole (ACD) antenna. Combination of linear charge density and point charges is used to generate different profiles for ACD antennas. Two different profiles of ACD antenna are used as a feed for reflector based impulse-radiating antennas (IRAs). This paper focuses on the selection of ideal ACD profile as wel...