Operation Problems of the EER Transmitter with Narrowband Antenna

Gromorushkin, V. N.; Varlamov, O. V.; Dolgopyatova, A. V.; Voronkov, A. A.

doi:10.1109/sosg.2019.8706736

Cited by 26 publications

(2 citation statements)

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“…These requirements apply to transmitters that use the most common and energy-efficient envelope amplification path with pulse-width modulation (PWM) [15] and are not applicable to other methods of constructing modulation paths. The assumed physical causes of this effect were considered in [16]. A typical equivalent circuit of an NB electrically short antenna (e.g., a short vertical monopole) and its matching unit are shown in Figure 2a [16].…”

Section: Introductionmentioning

confidence: 99%

“…The assumed physical causes of this effect were considered in [16]. A typical equivalent circuit of an NB electrically short antenna (e.g., a short vertical monopole) and its matching unit are shown in Figure 2a [16]. The results for the impact of a radio pulse and a two-tone equal-amplitude signal with a frequency spacing of 100 kHz on an NB antenna with a quality factor Qa = 5 and a resonant frequency of 1000 kHz are shown in Figure 2b,c as an example.…”

Section: Introductionmentioning

confidence: 99%

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Theoretical Comparison of Different Envelope Elimination and Restoration Transmitter PWM Modulator Configurations to Expand the Possible Antenna Mismatch

Nguyen,

Gromorushkin,

Varlamov

2023

Sensors

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The main characteristics of high-efficiency switching-mode solid-state power amplifiers with envelope elimination and restoration (EER) methods depend on all their elements. In this article, we study the influence of the types and parameters of the envelope path low-pass filters (LPFs) on the EER transmitter out-of-band emissions. This article presents for the first time an analysis of EER transmitter operation where the output impedance of the PWM modulator is not equal to zero, as usual (with a one-sided loaded LPF), but is matched with the low-pass filter and the load (with a double-sided loaded LPF). Theoretical comparisons of EER transmitters’ out-of-band emissions were carried out with four envelope path LPF configurations (one-sided and double-sided loaded LPFs with a smooth and sharp transition, respectively), for both the nominal load (broadband antenna) and resonant antennas with a limited bandwidth. The analysis showed that for the case of transmitter operation on a resonant antenna with a limited bandwidth, the preferable option was the use of a sixth-order double-sided loaded LPF with a smooth transition. The use of the proposed modulator configuration allowed the transmitter to operate on an antenna with VSWR = 1.07 at the edges of the transmitted signal band with a minimum LPF bandwidth equal to 5.8 bands of the amplified signal. This could significantly expand its application capabilities and allow one to reduce the PWM clock frequency and increase efficiency.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%