Very Compact and Broadband Active Antenna for VHF Band Applications

Abstract

An active receiving antenna with small size consisting of a monopole loaded with a transistor bipolar is presented in this paper. A transistor is used in order to miniaturize the receiving active antenna size in VHF band. The vertical size of the structure is equal toλ/175, whereλis the wavelength at the lower frequency of the bandwidth. Despite the very small size of the antenna, the frequency bandwidth is very wide and the gain is suitable for FM application with sensitive receivers.

Intermodulation Distortion and Compression Point Measurement of Active Integrated Antennas Using a Radiative Method

“…This antenna based on [5] using a concept proposed by Meinke [6] is a monopole antenna with a bipolar junction transistor BFR182 making a part of a radiative structure. This antenna has been designed to work in the HF frequency band of interest and has a good matching around 10.65 MHz (Fig.…”

Active Compact Antenna for Broadband Applications

“…As shown in Figure 2, the monopole has been cut in to two parts and the bipolar transistor BFR 182 is directly integrated between these two parts of the monopole without matching circuit. The antenna is connected to a SMA connector through a 50 Ω microstrip line [18][19].…”

Miniaturised active integrated antennas: a co‐design approach

“…Self-mixing active antennas are reported in [7][8][9] where active device non-linearity is used for frequency up/down conversion. Low noise active antennas are shown in [10][11][12][13][14]. None of these self-mixing antennas or the active low noise antennas adopted integrated co-design approach which concurrently aims at meeting the amplifier design specifications along with antenna's desired performance.…”