Abstract
This paper investigates a non-Foster wideband circuit matching technique for an electrically small antenna (ESA). By introducing a negative impedance convertor into an active network, the active network can obtain an equivalent input gain at input port to improve gain, sensitivity and output ratio of signal to noise. In addition, it also increases the effective height of active antenna. The experimental results have verified the proposed method by using a 100 KHz–30 MHz wideband active receiving monopole antenna.
Highlights
With miniaturization of radio equipment, the broadband and compact antenna becomes more demanded for broadband communication equipment
For |CN | = Ci in (5), we have Vi = VS; namely, the active network input voltage is equal to the antenna source voltage, which implies that the input capacitance of the amplifier equals to 0 [11]
The active antenna in this paper is based on the operational amplifier OPA657, a product of Texas Instruments, due to their better intermodulation distortions (IMD), low noise, JFET-input, high dynamic range, and high gain bandwidth performances
Summary
With miniaturization of radio equipment, the broadband and compact antenna becomes more demanded for broadband communication equipment. The electrically small receiving antenna with Non-Foster matching can tickle the gain-bandwidth limitation, which was proposed by Harris, Myers, and Perry [2, 3]. This topic has drawn more attention for many years [4,5,6,7,8,9,10,11,12], and the significant achievements has made on this topic [8]. Though the existing techniques of electrically small antenna with nonFoster matching [9] network can obtain a good performance. The experimental results are employed to validate the proposed technique
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