H. Jumaat

A compact dipole UHF-RFID tag antenna

This paper presents a novel design of a compact dipole UHF-RFID tag antenna for the Malaysia frequency band (919-921 MHz). The design of the proposed tag antenna included meandering technique and capacitive-tip loading structure to reduce the size of the tag antenna. The overall dimension of the antenna is 43 × 26 × 0.787 mm3. The tag is composed of copper layer traces, SOT1122 chip from NXP Semiconductor and Rogers 5880 substrate with the relative permittivity of 2.2. The performance of the proposed tag antenna was analyzed in terms of matched impedance, return loss, antenna gain and tag reading range through CST simulation software. The tag reading range was also experimentally measured and the result was compared with the simulation result. The tag antenna has a long read range of 9.6 m in a direction normal to the reader.

Metal mountable UHF-RFID tag antenna with meander feed line and double T-match

A compact ultra-high-frequency (UHF) RFID tag with meander feed line and double T-match structure is proposed. The tag is composed of a copper layer at the upper and bottom side of a Rogers 5880 substrate, with the relative permittivity of 2.2 and a UCODE G2XM/G2XL chip from NXP Semiconductor. The tag with the overall dimension of 58 × 34 × 0.85 mm3 is not sensitive to the objects it is attached to including metallic object since the performance of the tag in free air and on metal objects remains almost the same. The double T-matching technique is implemented in the antenna design to easily match the antenna and the chip impedance. The antenna is designed to operate in Malaysia frequency range (919 - 923 MHZ). The performance of the tag is evaluated through simulation in terms of impedance matching, reflection coefficient and reading range.

Compact microstrip patch UHF-RFID tag antenna for metal object

A compact microstrip patch ultra-high-frequency (UHF) RFID tag antenna mountable on metal object is proposed in this paper. The antenna, which has a very simple structure without any shorting pin and shorting plate, is composed of meander feed line, rectangular loop and double T-match structure. The insertion of ground plane in the tag antenna design reduces the negative impact of metal objects to the performance of the tag antenna. The tag with the overall dimension of 58 × 34 × 0.85 mm3 is designed to operate in Malaysia frequency range with the center frequency of 921 MHz. The performance of the tag is evaluated through simulation and measurement in terms of impedance matching, S-Parameter and tag reading range. From measurement, the tag reading range obtained is 2.8 m in free air, while on metal object is 2.0 m.

Performance of an aperture coupled microstrip antenna on LTCC technology at 5.8 GHz

Studies on the performance of an aperture coupled microstrip line-fed patch antennas on low temperature co-fired ceramic (LTCC) operating at unlicensed 5.8 GHz frequency band is presented. Observation on the controlling parameters of the aperture coupled antenna on LTCC is conducted to investigate the effect of aperture slot at various layers with different height. The proposed concept of this idea is simulated on Ferro A6M microstrip ceramic substrate and compared with the simulated of aperture coupled antenna on Flame Retardent 4 (FR-4) substrate. The aperture coupled antenna using LTCC and FR4 layout is presented in this paper by using the CST 2011 simulation results.

10 GHz multilayer antenna proximity coupled feed using Low Temperature Co-fired Ceramic technology

In this paper, a 10 GHz multilayer antenna with proximity coupled feed using Low Temperature Co-fired Ceramic (LTCC) technology is presented. The multilayer antenna was designed to operate at 10.01GHz with return loss of -11.523283 dB. The antenna was simulated using CST Microwave Studio. The performance of the antenna in terms of antenna radiation pattern and antenna gain were analyzed and discussed. The results show that the gain is 3.435dB.

A multilayer fractal patch antenna using LTCC technology

In this paper, a 10 GHz fractal patch antenna using Low Temperature Co-Fired Ceramic (LTCC) Technology has been used. A comparison between two different designs of radiating patch which are conventional patch and fractal patch has been done to get the better result. A Minkowski first iteration fractal micro strip patch antenna has been used in this design. This antenna design consists of eight layer of substrate. The ground plane at the back of layer 1, the feeding line at layer 6 and the radiating patch at the layer 7. The dielectric constant for LTCC technology is 5.9 and the substrate thickness is 0.096 mm. Ferro A6S has been used for the substrate and silver has been used for the patch. The overall thickness in this design is 0.8mm. A multilayer fractal patch antenna was design and optimized using the CST Microwave Studio Suite 2012. For the conventional radiating patch, the simulated S11 results show a minimum of -13.99 dB at 10GHz and the maximum gain of 2.98 dB. The simulated S11 results for fractal radiating patch show a minimum of -14.28 dB at 10.14GHz. The simulated radiation pattern shows a maximum gain of 10.02 dB. The bandwidth of the antenna has been increased from 2.33 MHz to 16.1 MHz. From the result, it can be seen that the radiating patch with fractal design gives better result compared to the conventional patch.

An array Minkowski fractal patch using LTCC technology

In this paper, a 10.1 GHz fractal patch antenna using Low Temperature Co-Fired Ceramic (LTCC) Technology has been used. A Minkowski first iteration fractal micro strip patch antenna has been used in this design. However, a good agreement in terms of gain still did not achieved for X-band operation. To solve the problem, basic design is then be improve by using array concept to increase the antenna performances in terms of gain and bandwidth. A comparison between two types of antenna array is done between 2 by 1 and 2 by 2 design. A simulated result which is the gain of the antenna is increase from 10.02 dB to 13.51 dB for 2 by 2 antennas by using array concept and bandwidth of 99 MHz. From the result, it is shows that 2 by 2 array antenna design gives wider bandwidth and higher gain as compared with 2 by 1 array antenna.

Triple band off-centre-fed microstrip antenna on LTCC technology

In this paper a design of a Triple Band Off-Centre-Fed Microstrip Antenna (TBOCFMA) with dual radiation patch on low temperature co-fired ceramic (LTCC) technology operating at 5.8 GHz, 6.3 GHz and 10 GHz frequency band is presented. This paper develops dual radiating patch with the aperture slot at the ground between second radiation patch that has been fed with off-centred feedline technique to create another resonant frequency. The advantages of the low thickness of LTCC ceramic substrate (Ferro A6M) compare to the conventional substrates with multilayer package has been benefited in this paper. The proposed concept of this idea have the gain at the proposed frequencies of 3.53 dB, 4.75 dB and 0.665 dB respectively has been simulated with CST 2011.

Side-coupled-ring medium-band directional coupler

A directional coupler based on a quarter-wavelength side-coupled ring is presented. Observation on the parameters that control the response of the directional coupler is conducted. While the length of the one-wavelength ring determine the center frequency, the reflection, transmission and isolation characteristics of the coupler can be varied by varying the impedance of the ring elements, which are the even- and odd mode impedance of the coupled-lines, Zoe and Zoo, and the ring line impedance, Zr. The proposed concept is tested in the design of a directional coupler at 2 GHz, using microstrip on FR4 substrate with characteristics of: ϵ r= 5, h = 1.6 mm and tan δ = 2.10-2. The side-coupled ring directional coupler is fabricated, and measurement results show good agreement with the ones from simulation.