A reduced size of log-periodic fractal Koch antenna (LPFKA) design with rectangular slots for Television White Space Spectrum (TVWS) bands application is proposed in this letter. The new introduced design technique of tilted rectangular slots into the fractal Koch radiating elements found out to enhance the impedance bandwidth as well as realizing high gain and reducing the size of log-periodic antenna. The 10 LPFKA's radiating elements are located on both sides of the substrate in a crisscross arrangement and obtained 15.3% miniaturization as well as 50.79% bandwidth and maximum of 36% gain increment. The proposed antenna has a largest dimension of 305 × 280 mm2, that is 0.44λ × 0.48λ over the lowest operating frequency of the 0.47–0.79 GHz TVWS bands. This antenna exhibits high gains of between 4.41 and 7.2 dBi and stable radiation patterns throughout the required UHF TVWS bands.

Outdoor localization estimation method for mobile based on single base station scattering distance in an urban area environment is proposed in this paper. This new approach is deployed for both Line-of-site and NonLine-of-site by using a single base station technique based on the measured scattering distances which are computed from the numerous multipath components signals. Those signals are coming from the scatterers around the mobile station (MS) and the base station (BS) by utilizing the time of arrival and the Angle of arrival effects. Site of the student's hostel at Universiti Malaysia Perlis was chosen to be our proposed scenario. A proper technique depending on the prior knowledge about the geometrical coordinates of some fixed obstacles surrounds both the subscriber and only one BS is suggested to identify the MS location. As a result, the localization of 70% from the subscribers can be identified which is more satisfactory compared to 67% U.S. Federal Communications Commission standard within 125 m

This paper proposed a compact Log Periodic Fractal Koch Antenna (LPFKA) by utilizing slots for Ultra High Frequency (UHF) Television White Space Spectrum (TVWS) bands applications. This log periodic antenna is comprised of ten radiating elements with titled slot angles and placed on both sides of the substrate in crisscross arrangement. This antenna was designed at frequency between 0.47 GHz and 0.79 GHz which focus on UHF TVWS bands. With the gains from 4.41 dBi to 7.2 dBi and reflection coefficient below than −10 dB over desired frequencies, this antenna is suitable and has a big potential for super Wi-Fi UHF TVWS applications.

A reduced size of Log Periodic Fractal Koch Antenna (LPFKA) with C-shaped stub is proposed in this paper mainly for Television White Space Spectrum (TVWS) applications which operate from 0.47 GHz to 0.79 GHz. The proposed antenna has a dimension of 285 mm x 220 mm which planned on FR-4 substrate with dielectric constant of εr = 4.7, loss tangent of tan δ = 0.019 and thickness of 1.6 mm. The addition of C-shaped stub at each end of the fractal Koch radiating element manages to reduce the dimension of conventional antenna by 26.58%. Log periodic antenna with C-shaped stub technique is able to achieve higher impedance bandwidth with the increase of the resonant length without additional space. The results show a good agreement with stable radiation patterns across the operating bands. With the gains varies from 4.35 dBi to 6.69 dBi and reflection coefficient below than -10 dB over the desired frequencies range, this antenna has a big potential for TVWS applications.

This paper discussed about the effect of different substrates on slotted Log Periodic Fractal Koch Antenna (LPFKA). This log periodic antenna is comprised of ten radiating elements with titled slot angles and placed on both sides of the substrate in crisscross arrangement. This LPFKA was designed at frequency between 0.47 GHz and 0.79 GHz which focus on UHF TVWS bands. A comprehensive study between the performances of the proposed antenna on different substrates is carried out. With the gains from 7.07 dBi to 7.95 dBi and reflection coefficient below than -10 dB over desired frequencies, this antenna is suitable and has a big potential for UHF TVWS applications.

This paper proposed a compact UHF slotted array antenna by utilizing slots to minimize the size of the antenna. The design presented used a substrate with a very high permittivity, which resulted in an antenna with practical dimension and thus a compact structure. This truncated edge linear polarized antenna is comprised of four patches as its radiating elements and feed by a single coaxial connector at the ground layer. This proposed antenna has a desired operating frequency of 0.63 GHz used to determine the performance of the antenna included the radiation pattern. This antenna focus on 0.63 GHz UHF band that is still predominantly used for TV broadcasting. With the gain of 5.03 dB and the reflection coefficient of −11.79 dB, this antenna is suitable and has a big potential for UHF application.

This paper deals with the development of wideband log periodic antenna by applying series iteration fractal Koch geometry and distributed inductive load. Rectangular stub is inserted at each end of fractal Koch structure for size reduction purposes. The dimension of conventional series iteration log periodic fractal Koch antenna (LPFKA) can be reduced by 18.24% with the addition of rectangular stub. The proposed antenna has a dimension of 285 mm x 245 mm deployed on FR-4 Epoxy dielectric substrate with relative permittivity of 4.7 and thickness of 1.6 mm. This antenna was designed to operate from 0.47 GHz to 0.79 GHz which focuses on Ultra High Frequency (UHF) Television White Space (TVWS) band applications. According to the simulation result, the proposed antenna achieves stable radiation patterns throughout the operating frequency band with the gains varies from 5.64 dBi to 6.7 dBi. The proposed antenna is a possible candidate for UHF TVWS applications.

This paper reports briefly on a new development of wideband YIG tuned oscillator for instrument applications. The idea of this work is to integrate a simplified real frequency technique (SRFT) with MATLAB algorithm to construct a suitable matching network that matches the amplifier with a load that drives to the maximum power and the system oscillate at the minimum output power of 15 dBm resulting a wide bandwidth up to 20 GHz. With the loading of SRFT in one-port negative resistance oscillator employing SiGe HBT as reflection amplifier and loop-coupled YIG crystal that exhibits ferrimagnetic resonance delivered a promising state-of-the-art design capability. Nevertheless, with the ease of Advance Design System (ADS) EM simulation, the enhanced YIG based oscillator design has demonstrated phase noise performance below -130 dBc/Hz an offset of 100 kHz over the entire range of 8 – 20 GHz.