Monopole antenna based on wrench‐shaped slot on circular disc patch for UWB application

Abstract

from 10-14% in the same range. We present better efficiency, which is in part benefited from the GaAs substrate. Our significantly high FOM and PAE demonstrate that it is well suited for the low-cost UWB power amplifiers. CONCLUSIONSIn this letter, we present an integrated distributed power distributed amplifier with a low-cost 2-lm GaAs HBT technology. We use the tapered collector line structure combined with the input capacitive coupling technique to improve the bandwidth and power efficiency. The measurement results give the gain of 8.1 dB with a gain flatness of 60.5 dB over a frequency range from 1 to 12 GHz. The 3-dB bandwidth is up to 12.24 GHz. The output 1-dB compressing point is 13.9 dBm at 5 GHz, and the associated PAE is 21.9%. The chip area is 0.99 mm 2 , and the power dissipation of the amplifier is 98 mW from a 2-V supply. Good agreement between the simulation and measurement results is achieved. Our work presents very good performance considering the trade-off of gain-bandwidth, efficiency, output power, and technologies among the recently published distribution amplifiers.ABSTRACT: A new printed wide slot antenna with single-and dualband notch behavior is presented. The base of antenna is a simple forkshaped radiating patch, which covers the ultra-wideband (UWB) frequency range. By using additional protrudent open circuit stubs on the base patch, multiband notch behavior is obtained. Effects of varying the added stubs parameters on the antenna performance show that the center frequency of band rejections can be finely tuned. The proposed dual-band notch antenna covers 2.4-10 GHz with two bands rejection Figure 8 Measured radiation pattern of the proposed antenna. (a) 4, (b) 6, (c) 7, and (d) 9 GHz

Mesh-Grounded Monopolar Hexagonal Microstrip Antenna for Artillery-Launched Observation Round

“…Several reported microstrip-based omnidirectional antennas and the presented designs are summarized in Table 2 for comparison. The ultrawideband microstrip or CPW-based monopole antennas in References [21][22][23] showed omnidirectional radiation patterns at a lower frequency of around 3 GHz due to electrically small antennas in those bands and large impedance bandwidths of over 100%. Since the omnidirectional radiation pattern of microstrip-based monopole antennas proceeds in the boresight direction, the radiator should be positioned perpendicularly to the common earth ground surface.…”

An Equilateral Arm Inverted U-Slot and Notch Loaded UWB-CPMA with Rendered Ground Plane

“…Numerous geometries of monopole MPAs have been investigated for UWB applications such as microstrip fed circular patch antenna utilizing a partial ground surface for UWB operations with stable radiation characteristics [10][11]. Wide Band behaviour is reported due to circular-square linked notch [12] and Saturn-shaped notch [13] on the partial ground surface with slotted circular disk monopole antenna. An electrically small size coplanar waveguide (CPW) fed circular disk monopole antenna provided very large impedance bandwidth with a flat gain [14].…”

A small CPW‐fed ultra wideband antenna with dual band‐notched characteristics

“…One of the major challenges in the design of UWB antennas is how to achieve small size antennas with low cost, low weight, and desired radiation pattern characteristics and electrical properties in the band of interest. In the design of a UWB planar monopole antenna, the shape of the antenna patch, the ground plane, and the geometry of the ground plane slots are of great importance [2, 3]. Different methods such as the truncated slot on the antenna patch have been proposed for increasing impedance bandwidth [4–6].…”