Wideband frequency reconfigurable antenna array

A novel dual-band circularly-polarized frequency reconfigurable microstrip antenna with the feasibility of obtaining a relatively smaller size is proposed and demonstrated. Fed by a Wilkinson power divider with 90° phase difference, the proposed circularly-polarized frequency reconfigurable patch antenna, consisting of a patch radiator etched with a square-ring slot and a double-sided printed DC bias circuit, is designed, analyzed and fabricated. Good agreement between simulated and measured results is observed. Simulation and measurement results reveal that the proposed dual-band circularly polarized (CP) antenna for BeiDou navigation satellite system can provide impedance bandwidths of 4.1% (1.592-1.658 GHz) and 5.5% (2.43-2.568 GHz) for lower L band and upper S band respectively, as well as 3-dB axial ratio (AR) bandwidths of 1.5% (1.602-1.626 GHz) and 1.7% (2.465-2.507 GHz) for LHCP and RHCP respectively. Meanwhile, within the effective LHCP/RHCP bandwidths, the proposed antenna has gains from 3.6 dBic to 4.2 dBic with an average gain of 4.0 dBic for LHCP, and gains from 3.3 dBic to 3.6 dBic with an average gain of 3.4 dBic for RHCP, respectively.

Section: Introductionmentioning

confidence: 99%

Compact dual-band circularly-polarized frequency reconfigurable microstrip antenna for BeiDou navigation satellite system application

Liang¹,

He²,

Zhang

et al. 2022

“…Waveguide power dividers have been widely used in many devices, such as high-power transmitters, power amplifiers, antenna array feed networks and multiplexers [1,2,3,4,5]. By employing a slow branching Y-junction, followed by the impedance matching steps, waveguide power dividers that operates over full waveguide band are developed in [6,7].…”

Section: Introductionmentioning

confidence: 99%

A novel H-plane based T-junction waveguide power divider for WR-10

Zhang

Chen

Liu

2022

In this paper, a novel H-plane T-junction waveguide power divider that can operate on the entire W-band is in troduced,it can save more space in many applications. It solves the problem that the traditional Hplane T-junction waveguide power divider cannot cover the entire W-band and the reflection coefficient is less than −20 dB. A H-plane T-junction power divider for the size of WR-10 waveguide are designed and fabricated used a blocking plate, two grooves and a stepped input matching transformer. The measured results agree well with the simulations and It is suitable for the whole frequency band of W, and the reflection coefficient is less than −20 dB. The optimized design size can also be used for other waveguides.

“…The rapid development of modern electronic test and measurement system exhibit a high demand for wideband signal generation [1,2,3]. Flexible signal generators such as arbitrary waveform generators (AWG) have been widely used in these aspects [4,5].…”

Section: Introductionmentioning

confidence: 99%

An estimation method of timing mismatch error in hybrid filter bank DACs

Yin

Tian

Liu

et al. 2020

This paper presents an estimation method of timing mismatch error in hybrid filter bank digital-to analog converter (HFB DAC). An approximated transfer function of HFB DAC with timing mismatch is derived based on the Taylor series. Then an iteration method is introduced to approach the timing error. Besides, we analyze the influence of test signal and give the requirements on test input. Using this signal, the iteration will have a fast convergence speed. Simulation experiments show the effectiveness of the proposed estimation method.