An RF Electronically Controlled Impedance Tuning Network Design and Its Application to an Antenna Input Impedance Automatic Matching System

Mingo, J. de; Valdovinos, Antonio; Crespo, A.; Navarro, D.; García, P.

doi:10.1109/tmtt.2003.821909

Cited by 162 publications

(90 citation statements)

References 6 publications

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“…Antenna impedances may typically exhibit vastly different impedances even at relatively closely spaced operating frequencies, making the range of possible impedances even larger when multiband operation is required. Antenna Tuning Units (ATUs) [14] provide dynamically controlled impedance matching for the antenna, improving efficiency, and have become common in handheld devices. Including an ATU in the EB transceiver would also have the important benefit of reducing the range of impedances presented to the duplexer, reducing range requirements for the balancing impedance, as depicted in Fig.…”

Section: Adaptation Rangementioning

confidence: 99%

Electrical balance duplexing for small form factor realization of in-band full duplex

et al. 2015

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Section: Adaptation Rangementioning

confidence: 99%

Electrical balance duplexing for small form factor realization of in-band full duplex

et al. 2015

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“…Research Article reflected waves [14][15][16], from which the reflection coefficient may be calculated. The adaptive algorithm that modifies the impedance matching network must be customised to the type of impedance matching circuit deployed.…”

Section: Iet Microwaves Antennas and Propagationmentioning

confidence: 99%

Wearable self‐tuning antenna for emergency rescue operations

Baroni

Nepa

Rogier

2016

IET Microwaves, Antennas & Propagation

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In this study, the design, hardware implementation and characterisation of a self-tuning 406 MHz antenna of a Cospas-Sarsat personal locator beacon are presented. The realised prototype is able to perform automatic tuning of the antenna under time-varying environmental conditions due to human body movements and sea water proximity. The impedance tuning is performed by tracking the instantaneous value of the reflection coefficient and by modifying an appropriate impedance matching network according to a real-time adaptive algorithm. A resilient default/backup software architecture has been designed to ensure that tuning guarantees a return loss higher than 10 dB for the personal locator beacon in most of impedance mismatching conditions.

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“…It is evident that the calculated matching level is increased by using a reactive impedance matching network [9,10,11]. Ideally, this compensation network could transform the frequency dependent complex antenna impedance Z in to a pure real resistance Z 0 over a large bandwidth as required as shown in Fig.…”

Section: Compensation Networkmentioning

confidence: 99%

“…Attachment of lossless matching network for impedance matching is also commonly utilized technique to improve the bandwidth. In [9,13] it is shown that utilizing transistors in the matching network, amplification and the matching function can be combined. In the following, the compact design combining the techniques of meandering and compensated network with pi matching for a microstrip antenna is demonstrated.…”

Section: Introductionmentioning

confidence: 99%

Meandered Slot and Slit Loaded Compact Microstrip Antenna With Integrated Impedance Tuning Network

Kaya¹

2008

PIER B

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Abstract-In this paper, novel compact broadband dual frequency microstrip antennas are presented and broad-band impedance matching is proposed as a method for improve the matching level of antennas. The first proposed design consists of a rectangular microstrip antenna with a pair of parallel slots loaded close to the radiating edge of the patch and three meandering narrow slots embedded in the antenna surface. The second proposed design consists of a rectangular microstrip antenna with a meandering slits. With the first proposed design a size reduction of 34% and 45% for the two resonant frequencies is obtained respectively. The two frequencies have an operation frequency ratio of 1.30 and 1.25. The theoretical design implementation of compensated compact rectangular microstrip antennas with new configuration Pi-matching networks was presented. A new compensation network consisting of RC Mutator circuit and discrete capacitors are employed at the input of the microstrip antenna operating at 1.5 GHz and 2.5 GHz. The performance parameters of the designed microstrip antenna with and without compensation network were compared. The results show that compensation network can improve the return loss level and the resonant frequency can be controlled in a wide RF band.

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An RF Electronically Controlled Impedance Tuning Network Design and Its Application to an Antenna Input Impedance Automatic Matching System

Cited by 162 publications

References 6 publications

Electrical balance duplexing for small form factor realization of in-band full duplex

Electrical balance duplexing for small form factor realization of in-band full duplex

Wearable self‐tuning antenna for emergency rescue operations

Meandered Slot and Slit Loaded Compact Microstrip Antenna With Integrated Impedance Tuning Network

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