A Coupled Line Impedance Transformer for High Termination Impedance with a Bandpass Filtering Response

Kim, Phirun; Jeong, Yongchae

doi:10.26866/jees.2018.18.1.41

Cited by 9 publications

(8 citation statements)

References 11 publications

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“…Filters are usually used to reject unwanted bands to improve communication quality. However, the use of filters increases the cost and volume of the system as well as insertion losses [4][5]. Therefore, much research has been focused on the design of UWB antennas that have band rejection features to avoid potential interference from existing bands.…”

Section: Introductionmentioning

confidence: 99%

A Rectangular Notch-Band UWB Antenna with Controllable Notched Bandwidth and Centre Frequency

Abbas

Hussain

Jeong

et al. 2020

Sensors

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This paper presents the design and realization of a compact ultra-wideband (UWB) antenna with a rectangular notch wireless area network (WLAN) band that has controllable notched bandwidth and center frequency. The UWB characteristics of the antenna are achieved by truncating the lower ends of the rectangular microstrip patch, and the notch characteristics are obtained by using electromagnetic bandgap (EBG) structures. EBGs consist of two rectangular metallic conductors loaded on the back of the radiator, which is connected to the patch by shorting pins. A rectangular notch at the WLAN band with high selectivity is realized by tuning the individual resonant frequencies of the EBGs and merging them. Furthermore, the results show that the bandwidth and frequency of the rectangular notch band could be controlled according to the on-demand rejection band applications. In the demonstration, the rectangular notch band was shifted to X-band satellite communication by tuning the EBG parameters. The simulated and measured results show that the proposed antenna has an operational bandwidth from 3.1–12.5 GHz for |S11| < -10 with a rectangular notch band from 5–6 GHz, thus rejecting WLAN band signals. The antenna also has additional advantages: the overall size of the compact antenna is 16 × 25 × 1.52 mm3 and it has stable gain and radiation patterns.

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Section: Introductionmentioning

confidence: 99%

A Rectangular Notch-Band UWB Antenna with Controllable Notched Bandwidth and Centre Frequency

Abbas

Hussain

Jeong

et al. 2020

Sensors

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“…Impedance transformer (IT), as one of the basic components of radio frequency (RF)/microwave systems, can be utilized to achieve the desired impedance matching and the efficient power transmission. To improve the frequency selectivity, various ITs with bandpass response have been widely investigated [1][2][3][4][5][6][7][8][9][10][11] and applied to matching network designs of power amplifiers (PAs) [8][9][10][11]. In [1][2][3][4][5], different coupled-line structure filtering impedance transformers (FITs) with ultrahigh transforming ratio realize low/high termination impedance transformations, respectively.…”

Section: Introductionmentioning

confidence: 99%

A Dual-Band Dual-Output Filtering Power Amplifier Based on High-Selectivity Filtering Impedance Transformer

Zhen,

Wu,

et al. 2023

International Journal of RF and Microwave Computer-Aided Engine

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In this brief, a novel filtering impedance transformer with good selectivity and high termination impedance is proposed, of which close-formed design equations are derived and effectively verified. Then, a dual-band dual-output filtering power amplifier (PA) operating at 2.4-2.6 GHz and 3.4-3.6 GHz is designed based on the proposed filtering impedance transformer. The dual-band filtering PA contains a diplexer-like output matching network, which can separate two band signals into corresponding output branches. EM-simulated results of the diplexer-like output matching network show that the isolation between the two output ports is better than 30.7 dB. Finally, for demonstration, the dual-band dual-output filtering PA using a packaged 10 W transistor is fabricated, and the measured drain efficiencies are 45.3%-50.2% and 41.7%-53.2% at lower and higher bands, respectively. Also, a good dual-band filtering response is obtained. A good agreement between simulated and measured results is observed.

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“…This is normally achieved by using filters in the RF front-end. Although filters are effective devices, they can introduce extra loss and cost as well as affect the overall size of the systems [ 4 , 5 ]. To overcome interference between UWB systems and narrowband systems that operate within the UWB spectrum extensive research has been conducted over the past several years on developing UWB antennas that possess band-reject characteristics.…”

Section: Introductionmentioning

confidence: 99%

Realizing UWB Antenna Array with Dual and Wide Rejection Bands Using Metamaterial and Electromagnetic Bandgaps Techniques

et al. 2021

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This research article describes a technique for realizing wideband dual notched functionality in an ultra-wideband (UWB) antenna array based on metamaterial and electromagnetic bandgap (EBG) techniques. For comparison purposes, a reference antenna array was initially designed comprising hexagonal patches that are interconnected to each other. The array was fabricated on standard FR-4 substrate with thickness of 0.8 mm. The reference antenna exhibited an average gain of 1.5 dBi across 5.25–10.1 GHz. To improve the array’s impedance bandwidth for application in UWB systems metamaterial (MTM) characteristics were applied it. This involved embedding hexagonal slots in patch and shorting the patch to the ground-plane with metallic via. This essentially transformed the antenna to a composite right/left-handed structure that behaved like series left-handed capacitance and shunt left-handed inductance. The proposed MTM antenna array now operated over a much wider frequency range (2–12 GHz) with average gain of 5 dBi. Notched band functionality was incorporated in the proposed array to eliminate unwanted interference signals from other wireless communications systems that coexist inside the UWB spectrum. This was achieved by introducing electromagnetic bandgap in the array by etching circular slots on the ground-plane that are aligned underneath each patch and interconnecting microstrip-line in the array. The proposed techniques had no effect on the dimensions of the antenna array (20 mm × 20 mm × 0.87 mm). The results presented confirm dual-band rejection at the wireless local area network (WLAN) band (5.15–5.825 GHz) and X-band satellite downlink communication band (7.10–7.76 GHz). Compared to other dual notched band designs previously published the footprint of the proposed technique is smaller and its rejection notches completely cover the bandwidth of interfering signals.

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A Coupled Line Impedance Transformer for High Termination Impedance with a Bandpass Filtering Response

Cited by 9 publications

References 11 publications

A Rectangular Notch-Band UWB Antenna with Controllable Notched Bandwidth and Centre Frequency

A Rectangular Notch-Band UWB Antenna with Controllable Notched Bandwidth and Centre Frequency

A Dual-Band Dual-Output Filtering Power Amplifier Based on High-Selectivity Filtering Impedance Transformer

Realizing UWB Antenna Array with Dual and Wide Rejection Bands Using Metamaterial and Electromagnetic Bandgaps Techniques

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