Search results for: P. Akkaraekthalin
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This paper proposes the triple-band band pass filter for applications of GSM, Wi-MAX, and WLAN systems. The filter comprises of step-impedance resonators (SIRs) connected with capacitive load, which are combined by using cross coupling technique. Additionally, tapered lines are used to connect at both ports of the filter in order to enhance matching for the triple-band resonant frequencies. The filter...
chapter
This paper presents a tri-band slot antenna designed by using capacitive CPW for controlling the second and third harmonics as desired. The slot stub with meander line is employed for matching, resulting in return loss less than −10 dB at all three operating bands. Radiation patterns are omni-directional. Bandwidths of the proposed antenna are 360 MHz, 1200 MHz, and 1400 MHz at 1.9 GHz (1.81 GHz-2...
chapter
This paper proposes a multiband monopole antenna with double square slots and capacitive CPW (CCPW) feed for applications in LTE, WiMAX and WLAN systems. The CCPW feed can control harmonic frequencies as desired and reduce size from ideal CPW length of λ/2 to only λ/8, while the slot technique can make return loss less than −10 dB and increase extension gain of the proposed antenna. The designed antenna...
chapter
This paper proposes a multiband slot CPW antenna using capacitive feed and interdigital capacitor for GSM, WiMAX and WLAN systems. The design is based on coplanar feed slot antenna. It's the first time to reduce size from λ/4 about λ/8 and control harmonic frequency by using only one technique. In part of slot antenna, interdigital capacitor has been used to improve matching of return loss to be less...
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This paper presents a wideband monopole with built-in interdigital capacitor and interdigital capacitive structure on both sides of feed. The design is based on resonant characteristics of coplanar waveguide (CPW) interdigital capacitive resonators. The fabricated antenna has been operated from 1.83 GHz to 8.8 GHz with return loss S11 < −10 dB. The experimental results of the fabricated antenna...
article
Microwave and Optical Technology Letters > 55 > 4 > 863 - 866
By coupling a fractal loop resonator onto the back of a loaded‐fractal loop monopole and a shorted loop, a new triple‐band USB dongle antenna has been achieved and presented. The proposed antenna supports WiFi (2.4–2.5 GHz and 5.15–5.875 GHz) and WiMAX (3.4–3.6 GHz) applications. The proposed triple‐band planar antenna consists of a loaded‐fractal loop monopole for the 2.4 GHz band, a shorted loop...
article
Electronics Letters > 2012 > 48 > 23 > 1446 - 1447
A novel multiband loaded fractal loop monopole antenna using a Minkowski model is proposed. It is composed of a short monopole with a loaded fractal loop. The loaded fractal loop parameters are optimised starting from the Minkowski fractal model. The resulting antenna has a compact size of 10 × 45 × 0.8×mm3, which is suitable for USB dongle applications. From the measured results, the 10 dB return...
chapter
2010 Asia-Pacific Microwave Conference > 1074 - 1077
A triangular shape for a ultra-wideband bandpass filter is presented and experimentally confirmed. The proposed structure can be roughly allocated in range of the 3.1 - 10.6 GHz UWB band. Because of including the interdigital feed lines and stubs at port positions, the wide-rejection stopband is higher than 20 dB in the band 10.8 to 32.8 GHz which is simply adjusting the lengths of them. Meanwhile,...
chapter
In this paper we present a new compact two-layers microstrip bandpass filter using multilayer cross-coupled improved interdigital-loop resonators. The filter structure consists of four resonators placed on two microstrip stack layers. The coupling between the resonators on the upper layer and the lower layer is obtained by using three coupling apertures on the common ground plane. The full-wave simulator...
chapter
2009 Asia Pacific Microwave Conference > 1446 - 1449
This paper proposes a new broadband microstrip bandpass filter based on a step-impedance resonator (SIR) and embedded slot structure for a notch-band and improved upper stopband performances. A comprehensive treatment of a slotted resonator with both ends of interdigital coupled lines and an embedded slot feed is described. The proposed filter has a notch-band and a wider upper stopband, resulting...
chapter
2009 Asia Pacific Microwave Conference > 1439 - 1442
This paper presents wideband dual mode bandpass filter with a wide suppress harmonics using a square ring resonator structure with a novel perturbation by notch rectangular slot and an interdigital coupled lines with open stubs. A rectangular slot shape perturbation is excited to degenerate a dual mode, which is made the two reject bands on each side of passband, resulting in high sharp cutoff frequency...
chapter
This paper presents stacked antennas using a technique of fractal geometry. The antennas are designed to operate at the frequency of 2.45 GHz, which is used in application of wireless LAN. A single square patch antenna with stacking of a parasitic fractal patch, which is created by iterating a Narrow Pulse (NP) generator model at each side of normal square patch, is presented. The gain and fractional...
chapter
A dual microstrip resonator sensor for measurement of dielectric constant with high resolution and a compact area of material under test is proposed. The resonant characteristics obtained by the resonator are suitable for low loss material. The dielectric constant between 2 to 7 can be measured by using the proposed sensor. It has been found that the sensor has great potentials for practical applications...
chapter
This paper presents wideband dual mode microstrip bandpass filters using a square ring resonator structure with a novel perturbation by notch rectangular slot. A rectangular slot shape perturbation is excited to degenerate a dual mode, which is made the two reject bands on each side of passband, resulting in high sharp cutoff frequency and low insertion loss. The proposed filters have been designed...
chapter
A microstrip folded ring resonator sensor for measurement of dielectric constant in a compact area of material under test is proposed. The resonant characteristics of resonator vary with dielectric constant of material. Limitations in the microwave frequency response performances of the proposed sensor have been carefully studied in a range from 500 MHz to 3 GHz. It has been found that the proposed...
chapter
This paper proposes new broadband microstrip bandpass filters based on slotted stepped impedance resonator (SSIR) for improved stopband performances. A comprehensive treatment of slotted resonators and both ends of the resonator with interdigital coupled lines is described. The design concept is demonstrated with a slotted stepped impedance resonator. These filters have wider upper stopband resulting...
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This paper presents monopole antenna using the technique of square pulse Minkowski fractal geometry. The presented antenna is designed to cover at the operating frequency bands of 2.3, 2.45, 2.5, 5.2, 5.5, and 5.8 GHz, which is used in wireless local area network (WLAN; IEEE 802.11a, b, g) and mobile WiMAX (IEEE 802.16e) applications. Especially, the radiation patterns of antenna are still similar...
chapter
This paper presents a dielectric-property determination technique that measures the magnitudes of the reflection and coupling coefficients of coupled antennas. They are plotted on the epsivr psila epsivr rdquo plane, and the intersection of these two quantities provides the values of epsivr psila and epsivr rdquo where epsivr psila is the real part and epsivr rdquo is the imaginary part of the relative...
chapter
This paper proposes new microstrip bandpass Alters using modified linear tapered-line resonators (LTR) which are asymmetrical structures for improving stopband performances. The design concept is based on step impedance resonator by adjusting width on one side of the linear tapered-line resonator to be asymmetrical structure. These filters provide wider upper stopbands resulting from resonator bandstop...
chapter
This paper presents a dielectric-property determination system that measures magnitude of reflection and coupling coefficients of coupled antennas. They are plotted on a epsivr' epsivr" plane, and the intersection of these two quantities provides the value of epsivr' and epsivr". Measurement results of paddy validate the effectiveness of the proposed technique. The system provides accurate...
