A Compact 3.3–3.5 GHz Filter Based on Modified Composite Right-/Left-Handed Resonator Units

Abstract

In the RF (Radio Frequency) front-end of a communication system, bandpass filters (BPFs) are used to send passband signals and reject stopband signals. Substrate-integrated waveguides (SIW) are widely used in RF filter designs due to their low loss and low cost and the flexibility of their integration properties. However, SIW filters under 6 GHz are still too large to meet the requirement of portable communication devices due to their long wavelength. In this paper, a very compact fully integrated SIW filter is proposed and designed with RT6010 dielectric material to meet the small size requirement of portable devices for next-generation sub-6 G applications. The proposed filter contains two sawtooth-shaped composite right-/left-handed (CRLH) resonator units, instead of traditional rectangular-shaped CRLH resonator units, which makes the filter more compact and cost effective. The filter is designed and fabricated on an RT6010 substrate, with a size of only 10 mm × 7.4 mm. The measurement results illustrated that the proposed BPF shows a passband covering the frequency range of 3.25–3.45 GHz; the minimum passband insertion loss is only 2.4 dB; the stopband rejection is better than −20 dB throughout the frequencies below 3.0 GHz and above 3.8 GHz; S11 is as low as −37 dB at 3.35 GHz; and the group delay variation is only 1.4 ns throughout the operation bandwidth.

A Compact Broadband Circularly Polarized Wide-Slot Antenna With Axial Ratio Bandwidth Encompassing LTE 42 and LTE 43 Standards of 5G Mid-Band

“…The co-and cross-polarized patterns are close to each other (with a difference of less than 3dB) in the broadside direction (𝜃 = 0 𝑜 ), and this is good evidence for the presence of the CP in that direction. In general, the 5G antenna designers propose antennas for 5G mid-band either in the LTE 43 standard [23,24] or in the LTE 42 standard [25,26]. Unfortunately, these designs cannot be used in devices that works on the two standards because this requires using two different antennas for each standard.…”

Miniaturization Trends in Substrate Integrated Waveguide (SIW) Filters: A Review

“…In [74], a sawtooth CLRH-based SIW cavity resonator is designed. Miniaturization is achieved by using a high dielectric constant substrate (RT/duroid 6010 with a dielectric constant of 10.2) and sawtooth-shaped slots instead of conventional spiral CLRH structure.…”

A Stackelberg Security Game for Adversarial Outbreak Detection in the Internet of Things

“…The IoT system is composed of a mass of devices that are frequently exposed to public situations, lacking effective protection, and are more vulnerable to attack [16]. For example, while the administrator adopts a regular scheduling strategy to monitor network security status, the attacker can obtain the relevant information (e.g., position) of the sensors through some attack analysis tools (such as eavesdropping [17], extended sleep [18], polymorphic worm [19], probe-response attack [20]). The attacker strategically selects a network device node as a source of infection outbreak propagation through acquired sensors information to avoid being monitored [20].…”