Compact differential-fed antenna with filtering response

A novel singly differentially‐fed microstrip patch antenna (DFMA) is proposed, which is composed of a radiating patch, a differentially‐fed network with a twin antisymmetric miniaturized baluns and a ground plane for unidirectional radiation. In the differentially‐fed network, the signal is coupled to the two feedlines on both sides by the two miniaturized baluns. The radiating patch is excited by the coupling feed sheet located below the radiating patch, and the coupling feed sheet is connected to the upper end of the feedline. The lower end of the feedlines is connected to the ground plane, and there is a slot on the ground of the feeding network. Due to the existence of coupling feed sheet and slot, a second nonradiating resonant is achieved, and a wideband property is obtained. Finally, the prototype of the antenna is fabricated and studied experimentally. Simulated and measured results show that the impedance bandwidth of the antenna is 30.3% (1.71‐2.32 GHz) for S11 < −10 dB. Besides, a stable symmetric radiation pattern is obtained with gain around 9.6 dB and cross‐polarization less than −21 dB, which demonstrates the designed antenna has the property of wideband, high gain and low cross polarization.

Section: Antenna Structure and Working Principlementioning

confidence: 99%

“…In Refs. , the low cross‐polarization is obtained by using the differentially‐fed mechanism. However, the bandwidth of the patch antenna with differentially feeding is only about 18%, which is unable to meet the requirements of modern wireless communication systems.…”

Section: Introductionmentioning

confidence: 99%

A wideband patch antenna with a pair of antisymmetric balun as differentially fed network

Zhang

Lan

Liu

et al. 2018

“…Therefore, differential antennas are becoming increasingly popular. [14][15][16][17][18][19][20][21][22][23][24][25] In the design of filtering antennas, the differential feed is adopted to make up for the deficiency of single feed and realize further miniaturization of RF front end, which is significant for the integration of modern wireless communication. There are a few reports about the differential filtering antennas.…”

Section: Introductionmentioning

confidence: 99%

“…[23]. However, these differential filtering patch antennas [20][21][22][23][24] produced no radiation nulls. Radiation nulls are significant to the design of the filtering antenna, which can improve the out-of-band suppression of the filtering antenna.…”

Section: Introductionmentioning

confidence: 99%

“…In this article, a novel low-profile differential filtering patch antenna without extra filtering circuits is presented and discussed. Compared to the previous differential filtering antennas, [20][21][22][23][24][25] the two parasitic patches are introduced to enhance the impedance bandwidth of the proposed antenna, and produce two independently controlled radiation nulls. To the authors' knowledge, it is the first time that controlled radiation nulls are independently generated in the design of differential filtering antenna.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

A novel differential filtering patch antenna with high selectivity

Wang

Ran

Hu³

et al. 2019

A novel differential filtering antenna with high selectivity is proposed. The antenna is mainly composed of three different‐size patches, a slot, a pair of differential feeding lines, and a line resonator. An air gap is adopted to improve the impedance bandwidth and the filtering performance. The line resonator helps to generate high common‐mode (CM) rejection. Owing to the parasitic concave and convex patches, the filtering performance and the bandwidth of the antenna are enhanced. The parasitic concave patch affects the lower band‐edge selectivity while the parasitic convex patch influences the upper band‐edge selectivity. In addition, the frequencies of two radiation nulls can be controlled independently to achieve two high sharp roll‐off rates by adjusting the lengths of the parasitic patches. Considerable impedance matching bandwidth is achieved through an aperture coupling. Finally, a prototype of the differential filtering antenna is fabricated and tested. The measured results are in good agreement with the simulated results, showing an impedance bandwidth of 9.9% and an average realized gain of 7.5 dBi. Besides, two filter zero transmissions located at 3.40 and 3.84 GHz produced two radiation nulls.

Compact differential‐fed dual‐band antenna via loading shorting pin

Liang

Huang

Zhang

et al. 2018

This article presents the design of a differential‐fed dual‐band antenna for wireless sensor network applications. A novel method is applied to enhance the bandwidth of a differential‐fed square patch antenna by loading shorting pin. Initially, a differential‐fed square patch antenna is introduced to generate the odd‐modes, that is, TM10, TM12 and TM30. Subsequently, with the adoption of a shorting pin, TM30 mode can be adjusted in proximity to TM12 mode for a dual resonance. At the same time, there is no effect on TM10 mode. A prototype antenna is fabricated and experimentally measured to verify the proposed method. Measured results show that the impedance bandwidth of the proposed antenna at the higher frequency band can cover from 5.11 GHz to 5.69 GHz while the lower frequency band operates from 3.35 GHz to 3.43 GHz.