A new model for calculating the input impedance of coax-fed circular microstrip antennas with and without air gaps

Guha, Debatosh; Damiano, Jean-Pierre; Ribero, Jean‐Marc; Staraj, Robert; Papiemik, A.

doi:10.1109/8.102754

Cited by 106 publications

(130 citation statements)

References 23 publications

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“…Bandwidth of microstrip antenna can be increased by designing the antenna with an air gap [1,4]. In order to obtain tunable characteristics, providing a wider bandwidth at the same time, a simple solution was proposed in the literature [5][6][7][8][9][10]. This was the inclusion of an adjustable air gap between the ground plane and the substrate resulting in a two-layered structure having new resonant frequency value [7].…”

Section: Introductionmentioning

confidence: 99%

Full-Wave Analysis of Anisotropic Circular Microstrip Antenna With Air Gap Layer

Bedra¹,

Bedra²,

Benkouda³

et al. 2014

PIER M

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Abstract-In this paper, the effect of both uniaxial anisotropy in the substrate and air gap layer on the resonant frequency and bandwidth of circular microstrip patch are investigated. The problem is rigorously formulated based on the spectral domain technic in conjunction with Galerkin approach for computing the resonant frequency, half-power bandwidth, and radiation field of a tunable circular patch antenna which is printed on isotropic or uniaxial anisotropic substrate. The TM set of modes issued from the magnetic wall cavity model theory are used to expand the unknown currents on the patch. Resonant frequency shift due to uniaxial anisotropy is firstly investigated for different anisotropy ratio values of substrate. Then, the effect of inclusion of air gap layer inserted between anisotropic substrate and ground plane on the resonance characteristics is also investigated. The results obtained from this approach are in very good agreement with the experimental results available in the literature.

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Section: Introductionmentioning

confidence: 99%

Full-Wave Analysis of Anisotropic Circular Microstrip Antenna With Air Gap Layer

Bedra¹,

Bedra²,

Benkouda³

et al. 2014

PIER M

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“…Moreover the stacked substrate structure in combination with the coaxial feed leads to broadband antenna behavior [14]. The utilized composite structure of the antenna has an average permittivity equal to [15]:…”

Section: Antenna Systemmentioning

confidence: 99%

Coupling Measurements of an Antenna System Suitable for Relay-Aided Wimax Network

Petropoulos¹,

Voudouris²,

Abd‐Alhameed³

et al. 2014

PIER C

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Abstract-In this paper two novel antennas, suitable for access and backhaul links, are designed, fabricated and tested for a Relay Station in a WiMAX wireless network. A single modified E-shaped patch antenna is described, presenting 10 dB gain over 12.4% bandwidth. This antenna element is used for the design of a 4 × 4 planar array which provides experimental gain of 21.2 dB. The antenna system on the Relay Station operates at 3.4 GHz and includes one single antenna element for access link realization and an antenna array for the backhaul link realization. These antennas are installed in two configuration arrangements and tested in terms of their radiation performances and coupling effects. The simulated and measured results are quite satisfactory and in good agreement at which the maximum coupling between the access and backhaul antennas is found below −25 dB for all tested cases.

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“…where k is the propagation constant, r 1 the feed position referred to the center to the circular disk radius r, G T the total conductance [18], and J 1 the Bessel function of order one [19]. The equivalent circuit is the combination of four parts: modelling of lengths l 1 , l 2 and l 3 of microstrip line, square shaped slot, coupling capacitance C f due to discontinuity of microstrip line and coupling capacitance C p between the square slot and microstrip line.…”

Section: Theoretical Analysis Of Proposed Antennamentioning

confidence: 99%

“…The discontinuity is added to the microstrip line and modelled by a fringing capacitance C f . The distance 'r' is chosen as input impedance of the circular patch in the square slot is 50 Ω at the end-edge point of microstrip line for proper matching [19].…”

Section: Theoretical Analysis Of Proposed Antennamentioning

confidence: 99%

A Novel Wide Band Microstrip-Line-Fed Antenna With Defected Ground for Cp Operation

Ansari¹,

Verma²,

Verma³

et al. 2015

PIER C

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Abstract-A novel wide band microstrip line-fed antenna with defected ground structure is proposed for circularly polarized characteristics. This antenna is suitable for C-band and partially X-band operation. Antenna1 structure consists of microstrip-line-feed, and the square-shaped slot defect is incorporated in the ground plane. Furthermore, rectangular and circular patches are embedded in the square-shaped slot that improves the performance of the radiating Antenna2 and Antenna3 structures, respectively. The proposed Antenna3 is compact in size and shows a good quality of polarization at resonant frequency band. Antenna3 shows the measured impedance bandwidth of 40.72% (6.45-9.75 GHz) and also shows the variations of 3-dB axial ratio bandwidth at the 6.806 GHz and 9.13 GHz frequencies with the simulated results, respectively. The return loss, axial ratio, gain, efficiency and radiation pattern of the proposed Antenna3 remain consistent for resonant frequency band. The antenna is practically fabricated and simulated. Measured result shows a good agreement with simulated and theoretical ones.

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A new model for calculating the input impedance of coax-fed circular microstrip antennas with and without air gaps

Cited by 106 publications

References 23 publications

Full-Wave Analysis of Anisotropic Circular Microstrip Antenna With Air Gap Layer

Full-Wave Analysis of Anisotropic Circular Microstrip Antenna With Air Gap Layer

Coupling Measurements of an Antenna System Suitable for Relay-Aided Wimax Network

A Novel Wide Band Microstrip-Line-Fed Antenna With Defected Ground for Cp Operation

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